N-doped carbon xerogels as adsorbents for the removal of heavy metal ions from aqueous solution
N-doped carbon xerogels as adsorbents for the removal of heavy metal ions from aqueous solution
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DOI：
10.1039/c4ra12441c
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发表时间：
2015
期刊：
影响因子：
3.9
通讯作者：
Binying Yang;Chen Yu;Qingni Yu;Xingwang Zhang;Zhongjian Li;L. Lei
中科院分区：
文献类型：
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作者：
Binying Yang;Chen Yu;Qingni Yu;Xingwang Zhang;Zhongjian Li;L. Lei
炭干凝胶（CX）和商业活性炭（AC）的结构性质的比较研究表明，CX具有较高的总孔体积和孔径，而其对水溶液中Pb（II）离子的吸附容量较低。因此，本研究的目的是通过在CX基体中引入N来改善吸附性能。相应地，所获得的N掺杂CX（NCX）的表面化学、多孔纹理和形态被修改。NCX对Pb、Zn和Cu的去除率分别是CX的1.97、1.67和1.64倍。结果表明，NCX的单位比表面积吸附金属离子的表面密度随N含量的增加而线性增加。NCX对Pb（II）离子的吸附符合准二级动力学和Langmuir模型，最大吸附量为83.8 mg g−1，表明NCX是一种很有前途的去除水中重金属离子的吸附剂。
Comparative studies of the textural properties of carbon xerogel (CX) and commercial activated carbon (AC) demonstrated that CX has higher total pore volume and pore diameter, whereas its adsorption capacity for Pb(II) ions in aqueous solution is lower. Herein, the purpose of the present study is to improve the adsorption performance by the introduction of N into the CX matrix on the basis of the extraordinary textural property. Accordingly, the surface chemistry, porous texture, and morphology of the obtained N-doped CX (NCX) were modified. The removal efficiencies of Pb, Zn and Cu by NCX were 1.97, 1.67, and 1.64 times of those by CX, respectively. It was found that the surface density of adsorbed metal ions per unit specific surface area of NCX increased as a linear function with the increase in the N content. The adsorption process of Pb(II) ions followed the pseudo-second-order kinetics and Langmuir model with a maximum adsorption capacity of 83.8 mg g−1, indicating that NCX would be a promising adsorbent for removal of heavy metal ions from water.