Arsenic sorption and redox transformation on iron-impregnated ordered mesoporous carbon

被引：20

作者：

Gu, Zhimang ^{[1
]}

Deng, Baolin ^{[1
]}

机构：

[1] Univ Missouri, Dept Civil & Environm Engn, Columbia, MO 65211 USA

来源：

APPLIED ORGANOMETALLIC CHEMISTRY | 2007年 / 21卷 / 09期

关键词：

arsenic; adsorption; surface complexation; redox transformation; ordered mesoporous carbon (OMC); iron-containing adsorbent;

D O I：

10.1002/aoc.1283

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Ordered mesoporous carbon has been actively investigated for its potential applications as catalyst supports, electrochemical materials and gas separation media. In this study, we tested an iron-modified ordered mesoporous carbon (FeOMC) for its ability to adsorb arsenic from the aqueous phase. The FeOMC synthesis involved the preparation of an ordered silica template SBA-15, in situ polymerization of acrylic acid in the template, carbonization and template removal to obtain the ordered mesoporous carbon, and iron impregnation. Batch experiments showed that the pH level of the solution had a major impact on arsenic sorption. Further, we found that the presence of anions (i.e. PO43- and SiO32-) could significantly decrease the sorption of both arsenate and arsenite. Arsenite oxidation to arsenate was observed in alkaline solutions, with or without anions being present. The oxidation of arsenite was attributed to both direct and catalytic reactions with the surface functional groups on the ordered mesoporous carbon. Adsorption of arsenic on FeOMC could be well explained by the surface complexation model. Copyright (c) 2007 John Wiley & Sons, Ltd.

引用

页码：750 / 757

页数：8

共 35 条

[1]

AHN WS, 2001, STUD SURF SCI CATAL, V135, P4710

[2] One-step synthesis of high capacity mesoporous Hg2+ adsorbents by non-ionic surfactant assembly [J].

Brown, J ;

Richer, R ;

Mercier, L .

MICROPOROUS AND MESOPOROUS MATERIALS, 2000, 37 (1-2) :41-48

[3] Surface chemistry of ordered mesoporous carbons [J].

Darmstadt, H ;

Roy, C ;

Kaliaguine, S ;

Choi, SJ ;

Ryoo, R .

CARBON, 2002, 40 (14) :2673-2683

[4] Comparison of arsenic(V) and arsenic(III) sorption onto iron oxide minerals: Implications for arsenic mobility [J].

Dixit, S ;

Hering, JG .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2003, 37 (18) :4182-4189

[5]

Dzombak D.A., 1990, SURFACE COMPLEXATION

[6] Functionalized monolayers on ordered mesoporous supports [J].

Feng, X ;

Fryxell, GE ;

Wang, LQ ;

Kim, AY ;

Liu, J ;

Kemner, KM .

SCIENCE, 1997, 276 (5314) :923-926

[7] Mechanisms of arsenic adsorption on amorphous oxides evaluated using macroscopic measurements, vibrational spectroscopy, and surface complexation modeling [J].

Goldberg, S ;

Johnston, CT .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2001, 234 (01) :204-216

[8] Abiotic As(III) oxidation by hydrated Fe(III) oxide (HFO) microparticles in a plug flow columnar configuration [J].

Greenleaf, JE ;

Cumbal, L ;

Staina, I ;

SenGupta, AK .

PROCESS SAFETY AND ENVIRONMENTAL PROTECTION, 2003, 81 (B2) :87-98

[9]

GU Z, 2005, 230 ACS NAT M WASH D, V45, P832

[10] Synthesis and evaluation of iron-containing ordered mesoporous carbon (FeOMC) for arsenic adsorption [J].

Gu, Zhimang ;

Deng, Baolin ;

Yang, John .

MICROPOROUS AND MESOPOROUS MATERIALS, 2007, 102 (1-3) :265-273

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