Kinetics, equilibrium, and thermodynamics investigation on the adsorption of lead(II) by coal-based activated carbon.
Kinetics, equilibrium, and thermodynamics investigation on the adsorption of lead(II) by coal-based activated carbon.
复制标题
煤基活性炭吸附铅(II)的动力学、平衡和热力学研究
DOI：
10.1186/s40064-016-2839-4
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Liu X
中科院分区：
文献类型：
--
作者：
Yi Z;Yao J;Zhu M;Chen H;Wang F;Liu X
本研究的目的是探讨使用活性煤基活性炭（CBAC）吸附铅（II）从水溶液中通过批试验的可行性。考察了接触时间、pH值、温度和Pb（II）初始浓度对吸附的影响。Pb（II）的吸附强烈依赖于pH值，但对温度不敏感。Pb（II）去除的最佳pH在5.0-5.5的范围内，其中超过90%的Pb（II）被去除。平衡时间为60 min，吸附符合准二级动力学。等温吸附曲线符合Langmuir等温吸附模型，最大吸附量为162.33mg/g。吸附是放热和自发的性质。傅里叶变换红外光谱和扫描电镜分析表明，CBAC具有多孔结构，表面富含羧基和羟基，这可能在吸附Pb（II）中起主要作用。这些研究结果表明，CBAC具有很大的潜力，作为一种替代吸附剂去除铅（II）。
The goal of this research is to investigate the feasibility of using activated coal-based activated carbon (CBAC) to adsorb Pb(II) from aqueous solutions through batch tests. Effects of contact time, pH, temperature and initial Pb(II) concentration on the Pb(II) adsorption were examined. The Pb(II) adsorption is strongly dependent on pH, but insensitive to temperature. The best pH for Pb(II) removal is in the range of 5.0-5.5 with more than 90 % of Pb(II) removed. The equilibrium time was found to be 60 min and the adsorption data followed the pseudo-second-order kinetics. Isotherm data followed Langmuir isotherm model with a maximum adsorption capacity of 162.33 mg/g. The adsorption was exothermic and spontaneous in nature. The Fourier transform infrared spectroscopy and scanning electron microscopy analysis suggested that CBAC possessed a porous structure and was rich in carboxyl and hydroxyl groups on its surface, which might play a major role in Pb(II) adsorption. These findings indicated that CBAC has great potential as an alternative adsorbent for Pb(II) removal.