Effect of pH, ionic strength and humic acid on the sorption of uranium(VI) to attapulgite

被引：110

作者：

Niu Zhiwei ^{[1
]}

Fan Qiaohui ^{[1
]}

Wang Wenhua ^{[1
]}

Xu Junzheng ^{[1
]}

Chen Lei ^{[2
]}

Wu Wangsuo ^{[1
]}

机构：

[1] Lanzhou Univ, Radiochem Lab, Lanzhou 730000, Gansu, Peoples R China

[2] Shandong Univ Technol, Sch Chem Engn, Zibo 255049, Shandong, Peoples R China

来源：

APPLIED RADIATION AND ISOTOPES | 2009年 / 67卷 / 09期

关键词：

Attapulgite; UO22+; Sorption; pH; Humic acid; FULVIC-ACID; SURFACE COMPLEXATION; AQUEOUS-SOLUTION; FOREIGN IONS; POWDER-DIFFRACTION; HUMIC/FULVIC ACID; MX-80; BENTONITE; NA-RECTORITE; MAYA-BLUE; TEMPERATURE;

D O I：

10.1016/j.apradiso.2009.03.113

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Attapulgite was investigated to remove UO22+ from aqueous solutions because of its strong sorption capacity. Herein, the attapulgite sample was characterized by Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD) and acid-base titration in detail. Sorption of UO22+ on attapulgite was strongly dependent on pH values and ionic strength. The presence of humic acid enhanced the sorption of UO22+ on attapulgite obviously because of the strong complexation of humic acid (HA) with UO22+ on attapulgite surface. Sorption of UO22+ on attapulgite was mainly dominated by ion-exchange or outer-sphere complexation at low pH values, and by inner-sphere complexation at high pH values. The results indicated that attapulgite was a suitable material for the preconcentration and solidification of UO22+ from large volume of solutions because of its negative surface charge and large surface areas. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：1582 / 1590

页数：9

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