Department of Environmental Science and Engineering, Sichuan University, Chengdu 610065, China.
Department of Environmental Engineering, Chengdu University, Chengdu 610106, China.
Int J Environ Res Public Health. 2020 Jan 28;17(3):789. doi: 10.3390/ijerph17030789.
Adsorption by activated carbons (AC) is an effective option for phenolic wastewater treatment. Three commercial AC, including coal-derived granular activated carbons (GAC), coal-derived powdered activated carbons (PAC), and coconut shell-derived powdered activated carbons (PAC), were utilized as adsorbent to study its viability and efficiency for phenol removal from wastewater. Pseudo-first order, pseudo-second order, and the Weber-Morris kinetic models were used to find out the kinetic parameters and mechanism of adsorption process. Further, to describe the equilibrium isotherms, the experimental data were analyzed by the Langmuir and Freundlich isotherm models. According to the experimental results, AC presented a micro/mesoporous structure, and the removal of phenol by AC was affected by initial phenol concentration, contact time, pH, temperature, and humic acid (HA) concentration. The pseudo-second order kinetic and Langmuir models were found to fit the experimental data very well, and the maximum adsorption capacity was 169.91, 176.58, and 212.96 mg/g for GAC, PAC, and PAC, respectively, which was attributed to differences in their precursors and physical appearance. Finally, it was hard for phenol to be desorbed in a natural environment, which confirmed that commercial AC are effective adsorbents for phenol removal from effluent wastewater.
活性炭（AC）吸附是处理含酚废水的有效方法。本研究选用三种商业用活性炭，包括煤基颗粒活性炭（GAC）、煤基粉末活性炭（PAC）和椰子壳基粉末活性炭（PAC），作为吸附剂，研究其从废水中去除酚类物质的可行性和效率。采用伪一级、伪二级和 Weber-Morris 动力学模型来确定吸附过程的动力学参数和机制。此外，为了描述平衡等温线，通过 Langmuir 和 Freundlich 等温模型对实验数据进行了分析。根据实验结果，活性炭呈现出微孔/介孔结构，活性炭对苯酚的去除受初始苯酚浓度、接触时间、pH 值、温度和腐殖酸（HA）浓度的影响。发现伪二级动力学和 Langmuir 模型非常适合实验数据，GAC、PAC 和 PAC 的最大吸附容量分别为 169.91、176.58 和 212.96 mg/g，这归因于它们的前体和物理外观的差异。最后，在自然环境中，苯酚很难被解吸，这证实了商业用活性炭是去除废水中酚类物质的有效吸附剂。
