Adsorption of cadmium(II) from aqueous solution by surface oxidized carbon nanotubes
Adsorption of cadmium(II) from aqueous solution by surface oxidized carbon nanotubes
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DOI：
10.1016/s0008-6223(02)00440-2
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发表时间：
2003-01-01
期刊：
影响因子：
10.9
通讯作者：
Wu, DH
中科院分区：
文献类型：
--
作者：
Li, YH;Wang, SG;Wu, DH
用H2 O2、KMnO 4和HNO 3氧化碳纳米管。通过BET N-2吸附、激光粒度分析、Boehm滴定、zeta电位测定和镉吸附等方法研究了它们的理化性质。实验结果表明，镉（II）的吸附容量增加的三种氧化碳纳米管由于氧化引入的功能基团相比，生长的碳纳米管。当Cd（II）平衡浓度为4 mg·g-1时，H2 O2、HNO 3和KMnO 4氧化的碳纳米管对Cd（II）的吸附容量分别达到2.6、5.1和11.0 mg·g-1。碳纳米管对镉（II）的吸附具有强烈的pH依赖性，在较低的pH范围内，HNO 3和KMnO 4氧化碳纳米管对镉（II）的吸附量比未氧化碳纳米管和H2 O2氧化碳纳米管的吸附量增加更明显。CNT投加量对Cd（II）吸附的影响实验表明，当CNT投加量为0.03 ~ 0.08 g/100 ml时，KMnO 4氧化CNTs的吸附量比原生CNTs、H2 O2和HNO 3氧化CNTs的吸附量有较大幅度的提高，当CNT投加量为0.08 g/100 ml时，其去除率几乎达到100%.分析表明，高锰酸钾氧化碳纳米管托管锰残留物，这些肯定有助于镉吸附到一个尚未确定的程度。(C)2002爱思唯尔科技有限公司。保留所有权利。
Carbon nanotubes (CNTs) were oxidized with H2O2, KMnO4, and HNO3. Their physicochemical properties were investigated by BET N-2 adsorption, laser particle examination, Boehm's titration, zeta potential measurement and cadmium(II) adsorption. The experimental results suggest that cadmium(II) adsorption capacities for three kinds of oxidized CNTs increase due to the functional groups introduced by oxidation compared with the as-grown CNTs. The cadmium(II) adsorption capacity of the as-grown CNTs is only 1.1 mg g(-1), while it reaches 2.6, 5.1 and 11.0 mg g(-1) for the H2O2, HNO3 and KMnO4 oxidized CNTs, respectively, at the cadmium(II) equilibrium concentration of 4 mg 1(-1). Adsorption of cadmium(II) by CNTs was strongly pH-dependent and the increase of adsorption capacities for HNO3 and KMnO4 oxidized CNTs is more obvious than that of the as-grown and H2O2 oxidized CNTs at lower pH regions. The experiments of CNT dosage effect on the cadmium(II) adsorption show that the adsorption capacity for KMnO4 oxidized CNTs has a sharper increase at the CNT dosage from 0.03 to 0.08 g per 100 ml than the as-grown, H2O2 and HNO3 oxidized CNTs and its removal efficiency almost reaches 100% at CNT dosage of 0.08 g per 100 ml. Analysis revealed that the KMnO4 oxidized CNTs hosted manganese residuals, and these surely contributed to cadmium sorption to a yet-undefined extent. (C) 2002 Elsevier Science Ltd. All rights reserved.