椰壳活性炭吸附法去除水中苯酚

Zhi Hoong Ho, Liyana Amalina Adnan
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引用次数: 12

摘要

吸附法是最简单、经济要求低的技术之一。椰子壳是一种丰富的农业废弃物,在马来西亚既便宜又容易获得。该农业废弃物经600℃炭化和氯化锌活化转化为活性炭。考察了椰壳活性炭去除水中酚类化合物的能力。实验结果表明,椰壳活性炭吸附苯酚的平衡时间为120分钟。考察了接触时间、初始浓度、搅拌速度、吸附剂投加量、酚醛溶液pH等操作参数的影响。吸附动力学模型(拟一阶、拟二阶和Elovich方程)和等温模型(Langmuir、Freundlich、Temkin和Dubinin-Radushkevich)分别用于拟合实验数据。拟二级动力学模型最适合描述椰壳活性炭对苯酚的吸附。Temkin等温线模型能很好地表达平衡实验数据,但最大吸附量为19.02 mg/g,比以往的研究结果要低。当投加量为10g/L时,去除率可达92%。同时,在酸性条件下,活性炭对苯酚的吸附更有利。无因次分离因子表明了良好的等温行为。通过傅里叶红外光谱(FTIR)分析,确定了实验前后活性炭的官能团和化合物类别。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Phenol Removal from Aqueous Solution by Adsorption Technique Using Coconut Shell Activated Carbon
Adsorption is one of the simplest techniques with low economic requirements. Coconut shell is an abundant agriculture waste which is inexpensive and easy to be obtained in Malaysia. This agriculture waste was transformed to activated carbon via 600°C of carbonization and zinc chloride activation. The ability of coconut shell-based activated carbon to remove phenolic compounds from aqueous solutions was evaluated. From the experiment, the equilibrium time for the adsorption of phenol onto coconut shell-based activated carbon is 120 minutes. The effect of the operating parameters, such as contact time, initial concentration, agitation speed, adsorbent dosage, and pH of the phenolic solution were studied. Adsorption kinetics models (pseudo-first-order, pseudo-second-order, and Elovich equation) and isotherm models (Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich) were used to fit the experimental data.Pseudo-second-order was found to be the best fitted kinetics model to describe the adsorption of phenol on coconut shell-based activated carbon. While the equilibrium experiment data was well expressed by the Temkin isotherm model, The maximum adsorption capacity is determined as 19.02 mg/g, which is comparatively lower than the previous research. Meanwhile, 92% of removal efficiency was achieved by a dosage of 10g/L. Meanwhile, the adsorption of phenol by activated carbon was more favorable under acidic conditions. The favourable isotherm behavior was indicated by the dimensionless separation factor. The functional group and compound class of activated carbon before and after the experiment were determined through the analysis of Fourier-transform infrared (FTIR) spectroscopy.
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