Kinetics of diclofenac adsorption from aqueous solution on commercial activated carbon

R. Petrović, D. Bodroža, Pero Sailović, Vladimir Mlinarević, D. Gajić, Z. Levi
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引用次数: 1

Abstract

This paper studies the possibility of using activated carbon as an adsorbent for diclofenac (DFC) from aqueous medium. Batch sorption experiments were performed, and the influence of different parameters was studied: adsorbent dose, contact time and temperature. The experimentally obtained results were fitted according to two linear theoretical models of isotherms: Freundlich and Langmuir and according to two different kinetic models: pseudo-first and pseudo-second order. The optimal adsorption parameters were found to be: dose of adsorbent 0,5 g; contact time 60 minutes and temperature 20ºC, and the removal efficiency of diclofenac at these parameters was 92.8%.The results showed that the adsorption process follows a pseudo-second order kinetics and better matches the Freundlich isotherm model. The values of thermodynamic parameters indicate that adsorption process is spontaneous and exothermic. Based on the obtained data, it can be concluded that commercial activated carbon is an effective adsorbent for diclofenac from aqueous solution.
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商用活性炭吸附双氯芬酸的动力学研究
研究了活性炭作为双氯芬酸(DFC)的吸附剂的可行性。进行了间歇吸附实验,研究了吸附剂用量、接触时间和温度对吸附效果的影响。根据Freundlich和Langmuir两种等温线线性理论模型和伪一级和伪二级动力学模型对实验结果进行了拟合。最佳吸附参数为:吸附剂用量0.5 g;接触时间60 min,温度20℃,在此条件下双氯芬酸的去除率为92.8%。结果表明,吸附过程符合准二级动力学,较好地符合Freundlich等温模型。热力学参数值表明吸附过程为自发的放热过程。根据所获得的数据,可以得出结论,商品活性炭是水溶液中双氯芬酸的有效吸附剂。
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