Abstract
The environment is threatened by a diversity of pollutants, and synthetic dyes are considered a foremost environmental pollutant among them. The characteristics detected for the dye, e.g., toxicity and carcinogenicity, have brought severe problems for humans and aquatic organisms. The present study was done to clarify the potential of activated carbon made from cherry tree wood (CWAC) in the adsorption of cationic red 14 dye. In our experimental-laboratory study, the changes in removal efficiency were assessed by considering the changes in values of pH, concentration, adsorbent dose, contact time, and temperature. In addition, the nature of our prepared adsorbent was defined based on scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), and Fourier-transformed infrared (FTIR) spectroscopy techniques. The concentration of dye after the completion of experiments was recorded using a spectrophotometer at 514 nm. Evaluating the attained data by isotherm and kinetic models were also considered. Our results demonstrated the enhancement in the efficiency of the studied process at higher contact times, temperatures, and pH and its decline at higher initial dye concentrations. pH = 11, time of 45 min, dye concentration of 50 mg/L, and AC mass of 0.25 g/l were optimal values in obtaining the highest removal of the studied dye. Langmuir isotherm and pseudo-second-order (PSO) with (R2 = 0.9972) and (R2 = 0.9947) were the best isotherms and kinetic models in the description of the observed data, respectively. Considering the results, CWAC could be effectively utilized for the adsorption of cationic red 14 dye from solutions.
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Introduction
The water shortage, as a problem of recent decades, has been exacerbated by the discharge of untreated wastewater, especially wastewater containing organic dye (Saeed et al. 2010; Rahmani et al. 2022; Seidmohammadi et al. 2019). Available reports have been representative of producing 1.6 million tons of color compounds annually and entering 10 to 15% of this volume into the environment without any treatment process (Tan et al. 2015; Mohammadifard et al. 2022; Ghanbari et al. 2022). Color compounds from various industries including textiles, paper printing, food, and cosmetics are discharged into the environment (Shi et al. 2007; Hasani et al. 2021). Their presence in drinking water has been found to be associated with severe effects on vital human organs such as the brain, liver, kidneys, and central nervous system (Mohammed et al. 2014). These compounds are toxic, mutagenic, and carcinogenic, and on the other hand, due to the reduction in light transmission permeability into aqueous media, reduce photosynthesis, and lack of dissolved oxygen in the lower layers (Singh et al. 2011; Wang et al. 2008; Royer et al. 2009). Even trivial dye amounts (about 1 mg/l) in drinking water can make it unsuitable for human consumption (Salleh et al. 2011). Among different dyes used in the textile industries, the cationic 14 red dye has been found to be one of the most widely used and important cationic dyes (Naghizade Asl et al. 2016). Reducing and eliminating these pollutants is a remarkable subject and should be implemented before their discharge into aquatic environments (Salman 2009; Peyghami et al. 2021). Hence, a variety of methods are used to remove cationic red 14 dye from aqueous media. These methods include ion exchange, membrane processes, electrochemical degradation, ozonation, and adsorption (Hameed and El-Khaiary 2008; Qu et al. 2008). However, these methods have limitations, such as the production of excess sludge, the time-consuming fermentation process, and the inability to remove colored compounds continuously (Robinson et al. 2001).
Among these, the adsorption process due to its compatibility with the environment is one of the most attractive and at the same time the most effective methods for removing dyes (Qadri et al. 2009). The adsorption process is considered as a high-performance process for various reasons such as no production of hazardous materials and free radicals, reusability, simplicity, and flexibility in operation (Shen et al. 2011; Zhao et al. 2010). Minerals such as clay (Lambert et al. 1997), coconut husk (Vieira et al. 2011), magnesium chloride (Gao et al. 2007), sugarcane pulp ash (Mall et al. 2005a), oxyhumilite (McKay et al. 1999; Janos̆ et al. 2005), rice husk ash (Mane et al. 2007), and activated carbon (AC) (Malik 2004) have been used to adsorb pigments.
AC has been found a widespread application in removing contaminants from aqueous solutions; this widespread application is related to its specific surface area and high adsorption capacity, stable chemical properties, easy availability and handling, and high efficiency (Sobhanardakani and Zandipak 2016) Despite the advantages mentioned for AC, disadvantages such as the cost of production materials have limited the use of AC on a real scale. To solve the mentioned problem, low-priced materials, e.g., agricultural wastes, have been considered as a potential option (Bazrafshan and Kord 2013) and has chosen as a subject for many studies. For example, Bijari et al. prepared AC from grape shrub waste to remove reactive dye from Black 5 (Bijari et al. 2018). Moreover, Mousavi et al. have used AC prepared from the leaves of Grape trees to adsorb methylene blue bleach (Mousavi et al. 2016).
Our search among the available reports could exhibit the lack of documents on the use of AC prepared from cherry wood (CW) to adsorb the cationic red 14 dye. Therefore, preparing AC prepared from CW (CWAC) by chemical activation and its employment for eliminating cationic red 14 dye from aqueous solutions was considered as the main objective of our study. Based on this sub-objective of the present study was as follows: (a) determining functional and surface properties of the prepared AC; (c) defining optimal conditions employed for assessing the influence of pH, time, initial dye levels, AC mass, and temperature; (d) documenting adsorption equilibrium, isotherms, and adsorption kinetics for dye adsorption; (e) evaluating AC recyclability with HNO3 and NaOH in 5 cycles, and (f) comparing optimal conditions with actual wastewater.
Materials and methods
Cationic red 14 dye as a precursor of dye and other chemicals were purchased from Alvan Sabet Company in Hamedan and Merck Company in Germany, respectively. The general characteristics of cationic red 14 dye are reported in Table 1 (Vinitnantharat et al. 2008). Sodium hydroxide (NaOH) and 0.1 N sulfuric acid (H2SO4) were the solutions that were employed for adjusting the pH. Double distilled water was utilized for preparing and diluting the solutions in all steps of the study. In our study, evaluating the performance of the adsorption process was also done by considering the changes in values of factors including pH, prepared AC mass, time, and studied dye concentration. Lastly, studies related to isotherm and kinetics of the process were conducted.
Adsorbent preparation
Cherry wood (CW) was collected from gardens around Meshkinshahr, Iran. CW was chopped into small pieces. In the next step, to remove contaminants and impurities, the chopped pieces underwent a washing process several times with distilled water. It was impregnated with 85% phosphoric acid for 24 h at room temperature. It was then transported to a cylindrical metal reactor with a cylindrical lid and exposed to a temperature of 650 °C for 2 h Table 2.
After withdrawing the reactor from the furnace, the AC was rinsed with distilled water until neutralizing its pH and exposed to a drying process at 105 °C for 24 h, using an oven. Eventually, after sieving the prepared AC with a 20–30 mesh sieve, it was pulverized and stored (Mahvi and Heibati 2010).
Determining the nature of activated carbon
Investigating the structural properties and identifying the formed phases was performed through the employment of XRD analysis. For this analysis, the Philips device made in the Netherlands in the range of 2θ between 10 and 80 degrees with a scanning speed of 0.01 s per degree was used. The surface morphology of the synthetic samples was scanned by SEM analysis using TESCA MIRA III. Preparing Fourier Infrared (FTIR) assay was done based on potassium bromide (KBr) as a reference; its analysis with a resolution of 1.1 cm was performed in various diagnoses from 450 to 450 cm−1. Also, nitrogen adsorption/desorption isotherms were performed using BET (II BELSORP mini) analysis at 77 °C; by this analysis, the pore volume and specific surface area of AC were defined.
Test method
In the first stage of this study, preparing stock solution (1000 mg/l) was done via dissolving powder of cationic red 14 dye in double distilled water. Experiments of adsorption were designed based on defining different values of effective parameters, e.g., initial pH, prepared AC mass, time, initial dye concentration, and temperature. After regulating the solution pH, a known amount of AC was poured into the solution, and the solution was exposed to a stirring process at 250 rpm until the completion of the process. After that centrifuging the solution was considered to be at 3,000 rpm for 5 min. Dye absorption at 514 nm was read using a spectrophotometer (Naghizade Asl et al. 2016). Equations No. 1 and 2 are employed for calculating the dye removal percentage and the amount of dye adsorbed per unit mass of absorbent (qe, mg/g):(Rashtbari et al. 2018; Afshin et al. 2018; Shokoohi et al. 2018):
In mentioned equations, the dye removal percentage was shown by R. C0 (mg/l) and Ct (mg/l) were used to symbolize the dye concentration in the solution at the start and end of the process, respectively. qe (mg/g) represented adsorbent adsorption capacity, V (L) indicated solution volume and M (g) was the mass of the adsorbent.
Determination of pHzpc
The pHzpc test was performed to investigate the surface charge of activated carbon. To determine pHzpc, three solutions, i.e., 0.01 M sodium chloride salt solution and sulfuric acid and sodium solutions, were initially prepared; the first solution was used as electrolyte and two other solutions were the agents of pH control. After adjusting the pH of dye solutions to values from 2 to 12 and addition of 0.01 g/l adsorbent to them in the 100 ml Erlenmeyer flakes, the mixing process was considered for them at 150 rpm for 48 h. The observed pH after the mentioned period was recorded as final pH and was drawn against initial pH values to define the pHzpc point of the adsorbent, which was the intersection point of the lines with the straight line (Leili et al. 2018).
Results and discussion
Investigation of the structural nature of the AC
FTIR analysis
FTIR images for activated carbon before and after the cationic red 14 dye adsorption process for determining the vibrational frequency changes in the functional groups are shown in Fig. 1a.
The frequency spectrum was measured at 450–4000 cm−1. The FTIR spectrum disclosed the peaks at 1176, 1574, and 1648 related to the C–O bond tension of carboxylic acid, C=O and C=C, respectively, and peaks at 2937—2855 and 3446—3427 indicating the H–C and O–H bonds, respectively.
XRD analysis
Findings related to this analysis for prepared AC are publicized in Fig. 1b. According to this analysis, the peaks in the range 2θ equal to 23.61, 24.1, and 27.5 are correspondent to the existence of carbon in the structure of CWAC.
Brunauer–Emmett–Teller (BET)
According to the analysis of this part, the pore volume and the specific surface area of our prepared AC were defined. The isotherm of nitrogen gas adsorption–desorption on our evaluated AC is provided in Fig. 1c. Comparison of obtained results with the IUPAC (International Union of Pure and Applied Chemistry) classification revealed the consistency of adsorption–desorption isotherms with type IV of AC. Moreover, CWAC has a specific surface area of 738.17 square meters per gram, and the total pore volume is 0.558 cubic centimeters per gram. Also, the average diameter of AC pores is 0.2337 nm, which indicates the cavities of this adsorbent in the mesoporous area.
Investigation of adsorbent morphology using SEM analysis
SEM images for studied AC before and after the process of adsorption of cationic red 14 dye are represented in Fig. 2a and b, respectively. According to our observations, there was a consistency between surface microparticles on CWAC and other available reports represented by previous studies (Bijari et al. 2018; Nourmoradi and Noori 2015). SEM images were indicative of favorable porosity of the surface of the evaluated AC (Ghasemi 2018). As can be seen, the sharp adsorbent surfaces are coated with cationic red 14 dye to create smooth surfaces.
The effect of the solution pH and pHzpc
The pH of the solution is able to alter the adsorbent surface charge, the degree of ionization of the adsorbent, and the active adsorbent groups (Dargahi et al. 2022). Hence, changes in the initial pH of the solution can exhibit a remarkable share in the dye removal process. Considering results related to pHzpc and the effect of the initial pH on the efficiency of evaluated process reported in Fig. 3a, b, at different pH, an initial cationic red 14 dye level of 50 mg/l, a fixed AC mass of 0.1 g/l, a time of 30 min at 25 °C, an enhancement in the efficiency could be noticed by rising pH; so that it enhanced from 14 to 53.5% for pH increase from 3 to 11. Based on our result, the optimum pH was a pH of 11 for other experiments. In order to confirm the obtained results, it is necessary to know that the activated carbon at pHzpc is equal to 6.8 of the uncharged state, and at this pH, the adsorbent surface is affected by positive and negative charges equally. It should be noted that when the pH decreases, the adsorbent surface becomes positively charged due to the absorption of H+ ions, and the dye removal efficiency decreases. But in conditions where pHzpc < pH, the reverse of the process occurs, in other words, the adsorbent surface is negatively charged and the interaction between the adsorbent and the dye molecules increases. At acidic pH, high concentrations of hydrogen ions cause the adsorbent to hold a more positive charge; this thwarts the adsorption of cationic dyes on the adsorbent. In other words, there will be a competition between extra hydrogen ions and cationic dye molecules for adsorption on active sites. Consequently, a substantial decrease is recognized in the qe of the adsorbent at low pH values. According to the FTIR results obtained for CWAC, different functional groups such as carbonyl and hydroxyl are influenced by pH. On the other hand, carboxylic acid in the structure of AC has acidic properties and the viscosity of the skin surface of fruits is due to the presence of this factor, which increases the absorption potential of cationic red 14 dye (Pavan et al. 2008). Carbonyl functional groups (C=O) due to the negative charge in their structure allow for adsorbing cationic red 14 dye with a positive charge. Our results exhibited to have similarity to the research findings of Powell et al., who evaluated the adsorption of anionic and cationic dyes on volatile ash. In this study, it was recognized that removing cationic and anionic dyes developed and diminished with increasing pH, respectively. Loading of volatile ash adsorbent with negative charges at high pH has led to better removal of cationic dyes at high pH while loading of volatile ash adsorbent surface with positive charges at low pH values has resulted in high adsorption of anionic dyes at low pH (Janoš et al. 2003). According to (Naghizade Asl et al. 2016), by increasing the pH, the removal of basal dyes of purple 16 and cationic red 14 enhanced.
The effect of the adsorbent mass
The results of the dye adsorption efficiencies for different CWAC amounts of 0.025, 0.05, 0.1, 0.25, 0.35, and 0.5 g/l are displayed in Fig. 3c. Based on these findings, increasing the CWA amounts has participated in developing cationic red 14 dye removal because of rising the number of active adsorption sites available against a constant amount of dye level. Rising the adsorbent dose has been found to be associated with enhancing the chance of interaction between adsorbent particles, which results in reducing its surface area and increasing the penetration path length and thus declining the adsorption density (Mall et al. 2005b). Although the amount of dye removal increases with rising absorbent mass, a reduction in the amount of dye absorbed per gram of adsorbent (qe) was visible; so that when the CWAC mass increased from 0.025 to 0.5 g/l, the efficiency for 50 mg/l of dye after 30 min augmented from 45.10 to 98.74%. Also, the qe decreased from 902 to 92 mg because the concentration of the dye solution declined due to adsorption by unsaturated active sites on the adsorbent surface and the accumulation of particles and adhesion between them caused by increasing the amount of adsorbent (Calvete et al. 2009; Shokoohi et al. 2020). Rising the AC mass to a certain amount does not lead to noteworthy development in the amount of dye removal. It seems that at a certain adsorbent mass, the highest possible absorption rate is achieved and then the amount of contaminant remaining will remain constant even with increasing dose of adsorbent (Chakravarty et al. 2010). In the study of Sentil Kumar et al., it is also reported that increasing AC mass participated in developing dye removal efficiency and diminishing qe (Senthilkumaar et al. 2006).
The effect of the initial dye concentration
The influence of changes in the initial concentration of cationic red 14 dye on performance was explored at 25, 50, 75, and 100 mg/L (Fig. 3d). Regarding the obtained results, the percentage of cationic red dye removal dropped suggestively with increasing the initial concentration.
At a constant pH of 11, a CWAC mass of 0.25 g/l, and a temperature of 25 °C, the dye removal efficiency reduced from 100 to 59.88% for rising the pollutant concentrations from 25 to 100 mg/l. The mentioned observation is described by the fact that with increasing initial dye concentration, active sites and adsorbent capacity are limited and saturated rapidly at high concentrations of cationic red 14 dye (Karthikeyan et al. 2005). However, the amount of pollutant absorbed per unit mass of the adsorbent in the same conditions represented the opposite trend. An improvement in the qe of the AC can also be interpreted as follows: an increase in the concentration is associated with developing the driving force of mass transfer and the rate of passage of dye molecules from the solution to the liquid layer surrounding the adsorbent and finally to the surface of the adsorbent particles (Caturla et al. 1988). In other words, enhancing the qe is ascribed to increasing the collision between the dye-adsorbent molecules and also increasing the concentration gradient and thus accelerating the mass transfer. Mentioned evens is led to enhancing the adsorption of dye molecules by adsorbent particles and eventually developing the qe (Hameed 2009; Al-Ghouti et al. 2009).
Shokoohi et al. also concluded a decline in removal efficiencies for higher dye concentrations, due to the fixed number of sites on a certain amount of adsorbent (Al-Ghouti et al. 2009).
In another study by Wang et al., it was recognized that the adsorption of base dyes on MCM-22 zeolite lessened for higher initial dye concentrations (Wang et al. 2006).
It is also observed that in the first minutes, the adsorption rate is high and with the passage of time, the constant removal efficiency is observed. At 45 min, the equilibrium is reached. The dye removal efficiency progressed over time for different concentrations of the studied dye. These observations were representative of the lack of notable effect for the initial levels of dye on the time needed for reaching equilibrium. The rate of rapid and high adsorption in the early times was related to existing empty active sites on the adsorbent surface, which over time, their gradual occupation by dye molecules leads to obtaining the fixed dye adsorption values. On the other hand, increasing time will be associated with difficulty in the occupation of the remaining empty areas due to the increase in repulsive forces between the dye molecules (Luo et al. 2010; Mohamed and Ouki 2011).
Amin et al. inspected the removal of reactive orange dye by three different types of ACs and stated that the adsorption of this dye on AC was done very quickly in the first minutes and over time, the removal percentage increased and the maximum removal rate took about 1 h (Amin 2008).
The effect of the temperature
To investigate the changes in the efficiency of the evaluated process at different temperatures, experiments were performed at three temperatures of 10, 25, and 40 °C under optimal conditions (pH of 11, CWAC mass of 0.25 g, and 50 mg/l dye).
Our observations was representative of the fact that rising the temperature increases the dye removal efficiency by AC, so that by rising the temperature from 10 to 40 °C, the adsorption rate has improved from 74.08 to 98.4%. Increasing the adsorption rate with rising temperature specifies the heat absorption and the nature of the chemical adsorption process; this can be ascribed to the rise in the size of the adsorbent cavities and the enhancement in operative collisions between AC and adsorbate molecules (Namasivayam and Yamuna 1995).
Isotherm studies and adsorption kinetics
Adsorption kinetics
Defining the transmission quality of adsorbed molecules per unit time and studying variables that affect the reaction rate are done based on kinetic equations (pseudo-first-order (PFO) and pseudo-second-order (PSO) models in present study); linear kinetic equations of each model are presented as Eq. 3 and 4, respectively (Dargahi et al. 2021).
In the cited equations, K1 represents the rate coefficient (1/min) and K2 indicates the PSO reaction constant (mg/gr.min). qe and qt show the adsorption capacity at equilibrium time and t time in mg/g, respectively. qe and K1 are the intercept and the slope of the line graph obtained by drawing \(\ln \,(q_{e} { - }q_{t} ){ }\) versus t, respectively. In Eq. (4), determining qe and K2 values is based on the slope and intercept of the linear of graph t/qt versus t (Kakavandi et al. 2013; Borna et al. 2016).
Figure 4 represents the PFO and PSO models. The parameters of PFO and PSO are presented in Table 3. According to tables, the fit of PSO (regression coefficient 0.9947) with the experimental data is superior to that of PFO.
On the other hand, the qe predicted by the PSO has less difference relative to the experimental qe compared to the PFO. As depicted by Table 3, the PSO constant (K2) decreases with increasing dye levels. The presence of sufficient sites in a constant amount of adsorbent to absorb lower concentrations of dye could lead to observing the higher adsorption rate initially. Gradually, however, the rate of adsorption of dissolved materials also decreased since for high concentrations, a reduction in required active sites happened. It was correspondent to Amin et al., who scrutinized blue-106 removal using activated carbon (Borna et al. 2016).
Adsorption isotherms
These models have been known as adsorption properties and equilibrium data; describing the quality of reactions that occurred between contaminants react and adsorbents is done by these models, and they effectively participate in optimizing the use of adsorbent.
The isotherm models used in the present study were Langmuir and Freundlich, which were employed for investigating the dye adsorption behavior on AC. The hypotheses represented by the Langmuir model are surface uniformity monolayer adsorption and elimination of the interaction effects of adsorbate molecules.
The Equation related to Langmuir Model, the single-layer adsorption process, is given in Eq. (5). The Freundlich model of the adsorption process is defined by Eq. (6). The Langmuir relationship was consistent with experimental experiments when the adsorption sites were uniform. If the surface is heterogeneous, the Freundlich relation obtained by quantifying the amount of material adsorption at different pressures provides a better description of the data. In this model, n < 1 is indicative of poor absorption while values of 1–2 and 2–10 are representative of moderate and desirable absorption, respectively (Hao et al. 2010). Determining the values of n and Kf is accomplished based on the slope and intercept of the linear graph of log qe versus log Ce, respectively.
In the represented equations above, qeq (mg/g) is the amount of dye adsorbed per gram of adsorbent and Ceq (mg/l) is the equilibrium concentration of the dye in equilibrium. Q and b are Langmuir parameters; Q is related to maximum adsorption capacity and b corresponds to adsorption correlation energy (Biglari et al. 2018). Ce is used to show equilibrium concentration (mg/L), and qe represents adsorption capacity at equilibrium time (mg/g). Kf and n Freundlich are adsorption constants; these correspond to adsorption capacity and intensity (Niri et al. 2015). One of the properties of the Langmuir equation is the dimensionless parameter of the separation coefficient Rl; this is employed for defining the type of adsorption process. If Rl > 1 type of adsorption is undesirable, Rl = 1 type of linear adsorption, 1 > Rl > 0 optimal adsorption, and Rl = 0 adsorption is irreversible (Mahvi and Heibati 2010). The equation of separation coefficient Rl is presented in Eq. (7).
For both studied isotherm models, plotting them was done based on the obtained data from experiments conducted under optimal conditions and results observed for the parameters represented by linear regression. Our observations were indicative of the greater consistency of data achieved by experiments with the Langmuir model diagram Fig. 5.
The correlation coefficients detected for these two models approved the higher correlation coefficient of the Langmuir model (0.9972) compared to Freundlich (0.9839); based this, the Langmuir model is introduced as a better model for unfolding the dye adsorption behavior. Therefore, the mentioned results indicate the uniform active site distribution on the adsorbent surface and subsequently the adsorbing pigment in homogeneous locations. The Langmuir and Freundlich parameters of cationic red 14 dye adsorption are publicized in Table 4. The maximum qe for produced AC using the Langmuir model is 348.61 mg/g. Our findings were observed to be in-line with the reports provided by Xiao, Sential Coma, and Ahmed et al. (Senthilkumaar et al. 2006; Xiao et al. 2012; Ahmad and Rahman 2011).
Table 5 compares the qe of CWAC with studies conducted for dye removal by other adsorbents. The CWAC shows a higher qe than AC prepared in previous studies.
Adsorbent recovery
Having the characteristic of recoverability and reusability has been identified to be vital for adsorbents from economical and practical aspects. The employment of chemical methods for the recovery of adsorbents has recently found remarkable popularity. The findings related to the recovery and reuse of evaluated AC are depicted in Fig. 6. In chemical recovery, red cationic dye molecules 14 are dissolved in solution or replaced by ion exchange with the AC surface. NaOH ions compete with cationic red 14 dye located in active sites, and cationic red 14 dye is isolated from active sites and adsorbed. Our results confirmed the substantial potential of studied AC in the treatment of wastewater and its cost-effectiveness since it exhibited a reusability in five consecutive cycles.
Conclusion
The present study evaluates the cationic red 14 dye adsorption using CWAC. Our results were indicative of the high efficiency of our prepared AC so that it could afford significant dye removal efficiency in a short time. Enhancing dye removal efficiency by rising pH, prepared AC dose, and time was another observation in our study. Further, increasing the concentration of cationic red 14 dye has resulted in a decline in the efficiency of the process. Langmuir was found the best isotherm model, and PSO was the best kinetic model based on our observations. Generally, our findings ratified that the adsorption process using CWAC could be an operative technique for eliminating cationic red 14 dye from aqueous media.
Data availability
The dataset and analyzed during the current study are available from the corresponding authors on realistic demand.
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Acknowledgements
We hereby thank the esteemed Vice Chancellor for Student Research of Ardabil University of Medical Sciences and Ardabil Health Services for financial support of this research (design code IR.ARUMS.REC.1397.222) and esteemed colleagues in the Faculty of Health.
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The current study was financially supported by Ardabil University of Medical Sciences.
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Askari, R., Mohammadi, F., Moharrami, A. et al. Synthesis of activated carbon from cherry tree waste and its application in removing cationic red 14 dye from aqueous environments. Appl Water Sci 13, 90 (2023). https://doi.org/10.1007/s13201-023-01899-1
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DOI: https://doi.org/10.1007/s13201-023-01899-1