Phenol adsorption on magnetic biochar derived from olive pomace: Equilibrium, kinetic and thermodynamics

G. Dinç, S. Yildiz, E. Yel
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引用次数: 3

Abstract

I n this study, magnetic biochar obtained from pyrolysis of pretreated olive pomace by iron chloride was used as adsorbent to remove phenol and the adsorption capacity of phenol was revealed. Batch experiments were performed as a function of pH, contact time, adsorbent dosage, temperature, and phenol concentration. Moreover, adsorption kinetics and thermodynamics of phenol adsorption onto magnetic biochar were also evaluated in the study. The optimum conditions for maximum adsorption capacity were obtained at pH of 5.7, dosage of biochar 0.14 g and 60 minutes contact time. In this study, three adsorption isotherms, namely Langmuir, Freundlich and Temkin, were applied to fit the equilibrium data of adsorption of phenol onto magnetic biochar. Results showed that correlation coefficients (R 2 ) for three isotherm models decreased with the temperature increment from 20°C to 40°C and the most suitable isotherm model for adsorption was Freundlich. As for kinetics of the adsorption process, the best described model was found as pseudo-second order. In adsorption thermodynamics part, the negative ΔH° and ΔG° values demonstrated that adsorption was exothermic, feasible and was more spontaneous at lower temperatures.
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橄榄渣磁性生物炭对苯酚的吸附:平衡、动力学和热力学
本研究以预处理橄榄渣经氯化铁热解得到的磁性生物炭为吸附剂去除苯酚,并对苯酚的吸附能力进行了研究。对pH值、接触时间、吸附剂用量、温度和苯酚浓度进行了批量实验。此外,还研究了磁性生物炭对苯酚的吸附动力学和热力学。最佳吸附条件为:pH = 5.7,炭投加量0.14 g,接触时间60 min。本研究采用Langmuir、Freundlich和Temkin三条吸附等温线拟合苯酚在磁性生物炭上吸附的平衡数据。结果表明:在20 ~ 40℃范围内,3种等温线模型的相关系数r2随温度升高而减小,最适合吸附的等温线模型为Freundlich模型;对于吸附过程动力学,最好的描述模型为准二级。在吸附热力学部分,负的ΔH°和ΔG°值表明吸附是放热的,可行的,并且在较低温度下更自然。
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