Impact of contact time, pH, ionic strength, soil humic substances, and temperature on the uptake of Pb(II) onto graphene oxide

Impact of contact time, pH, ionic strength, soil humic substances, and temperature on the uptake of Pb(II) onto graphene oxide
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接触时间、pH、离子强度、土壤腐殖质和温度对氧化石墨烯吸收 Pb(II) 的影响

DOI:
10.1080/01496395.2017.1281302
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发表时间:
2017-01
影响因子:
2.8
通讯作者:
Fang Yanfeng
Fang Yanfeng
中科院分区:
工程技术4区
文献类型:
--
作者:
Li Xue;Zhao Kang;You Caiyin;Pan Hui;Tang Xiaoping;Fang Yanfeng

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摘要研究了氧化石墨烯对废水中Pb(II)的吸收随各种水质参数的变化。结果表明,土壤对有机磷的吸收速率较快,其吸收动力学符合准二级动力学模型。吸收强烈依赖于pH值和独立的离子强度。即,内球表面络合是主要的吸收机制。腐殖酸或富里酸的存在下,在低pH值的吸收增强,而在高pH值的减少。的Langmuir,Freundlich,Dubininin-Redushkevich(D-R)等温线模型被用来模拟的吸收。热力学分析表明,吸收是自发的吸热过程。
ABSTRACT The uptake of Pb(II) from wastewaters onto graphene oxide was studied as a function of various water quality parameters. The results indicated that uptake was fast and kinetic uptake could be well fitted by a pseudo-second-order model. The uptake was strongly dependent on pH and independent of ionic strength. Namely, inner-sphere surface complexation was the main uptake mechanism. The presence of humic acid or fulvic acid enhanced the uptake at low pH values, while reduced at high pH. The Langmuir, Freundlich, and Dubinin–Redushkevich (D-R) isotherm models were used to simulate the uptake. Thermodynamics indicated that the uptake was endothermic and spontaneous.
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