Sequestration of Ni(II) onto graphene oxide from synthetic wastewater as affected by coexisting constituents
Sequestration of Ni(II) onto graphene oxide from synthetic wastewater as affected by coexisting constituents
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DOI：
10.1080/19443994.2015.1110841
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发表时间：
2015-11
影响因子：
1.1
通讯作者：
Xue Li;Mei Yu;Qingmei Lv;Yongsheng Tan
中科院分区：
文献类型：
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作者：
Xue Li;Mei Yu;Qingmei Lv;Yongsheng Tan
本文采用间歇吸附技术研究了氧化石墨烯(GO)对Ni(II)的吸附作用。研究了接触时间、介质pH和共存成分腐植酸(HA)和黄腐酸(FA)在GO吸附Ni(II)过程中的作用。结果表明，在pH为2.0~9.0时，GO对Ni(II)的吸附由~20%增加到~95%，然后随pH的升高而保持较高的吸附水平。动力学数据表明，吸附迅速达到平衡，并符合准二级动力学方程。在pH值为8.0时，HA/FA对GO吸附Ni(II)起到了积极的作用。变温吸附等温线的热力学分析表明，GO对Ni(II)的吸附是自发的、吸热的。实验结果表明，GO对Ni(II)的吸附主要是由表面吸附引起的。
AbstractThis article examines the sequestration of Ni(II) onto graphene oxide (GO) by an adsorption process using batch technique. The role of contact time, medium pH, and coexisting constituents like humic acid (HA) and/or fulvic acid (FA) in the adsorption of Ni(II) onto GO was studied. The results indicated that the adsorption of Ni(II) onto GO increased from ~20 to ~95% at pH 2.0–9.0, and then maintained the high level with increasing pH. Kinetic data showed that the adsorption obtained equilibrium quickly and was fitted well by the pseudo-second-order equation. The presence of HA/FA imposing a positive role Ni(II) adsorption onto GO was found at pH 8.0. The thermodynamic analysis from the temperature-dependent adsorption isotherms suggests that the adsorption of Ni(II) onto GO is spontaneous and endothermic. Experimental results provided evidence that the adsorption of Ni(II) onto GO was mainly attributed to surfa...