Adsorption mechanism of copper and lead ions onto graphene nanosheet/δ-MnO2

被引：179

作者：

Ren, Yueming ^{[1
,2
]}

Yan, Ni ^{[3
]}

Feng, Jing ^{[2
]}

Ma, Jun ^{[1
]}

Wen, Qing ^{[2
]}

Li, Nan ^{[2
]}

Dong, Qing ^{[2
]}

机构：

[1] Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China

[2] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Minist Educ, Key Lab Superlight Mat & Surface Technol, Harbin 150001, Peoples R China

[3] Harbin Multiphase Water Treatment Tech Co Ltd, Harbin 150090, Peoples R China

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2012年 / 136卷 / 2-3期

基金：

美国国家科学基金会;

关键词：

Composite materials; Adsorption; Interfaces; Surface properties; AQUEOUS-SOLUTIONS; REMOVAL; SORPTION; MIXTURE; CU(II); PB(II); WATER;

D O I：

10.1016/j.matchemphys.2012.07.023

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The removal behaviors of Cu(II) and Pb(II) ions onto graphene nanosheet/delta-MnO2 (GNS/MnO2) adsorbent were investigated under various conditions including contact time and initial metal concentrations. The surface interactions involved in the adsorption process and the regeneration were also explored. The equilibrium adsorption data could be well described by the pseudo-second-order kinetic model and the Langmuir equation. Weber-Morris model suggested that the sorption was a multi-step with the pore and surface diffusion process. The maximum adsorption capacity of GNS/MnO2 for Cu(II) and Pb(II) ions were 1620 and 781 mu mol g(-1), respectively. FTIR and XPS studies illuminated that the formation of complexes on GNS/MnO2 surface mainly consisted of the oxygen in hydroxyl (C-OH, Mn-OH) and carboxyl groups. Moreover, XRD analysis further confirmed that Cu(II) or Pb(II) could not only adsorb on the surface of GNS/MnO2, but also intercalate the layered of MnO2. GNS/MnO2 can be used four times by HC1 solution. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：538 / 544

页数：7

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