A Quantitative Model for the Coupled Kinetics of Arsenic Adsorption/Desorption and Oxidation on Manganese Oxides

被引：48

作者：

Feng, Xionghan ^{[1
]}

Wang, Pei ^{[2
]}

Shi, Zhenqing ^{[2
]}

Kwon, Kideok D. ^{[3
]}

Zhao, Huaiyan ^{[1
]}

Yin, Hui ^{[1
]}

Lin, Zhang ^{[2
]}

Zhu, Mengqiang ^{[4
]}

Liang, Xinran ^{[1
]}

Liu, Fan ^{[1
]}

Sparks, Donald L. ^{[5
,6
]}

机构：

[1] Huazhong Agr Univ, Coll Resources & Environm, Key Lab Arable Land Conservat Middle & Lower Reac, Minist Agr, Wuhan 430070, Hubei, Peoples R China

[2] South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China

[3] Kangwon Natl Univ, Dept Geol, Chunchon 24347, South Korea

[4] Univ Wyoming, Dept Ecosyst Sci & Management, Laramie, WY 82071 USA

[5] Univ Delaware, Delaware Environm Inst, Environm Soil Chem Grp, Newark, DE 19716 USA

[6] Univ Delaware, Dept Plant & Soil Sci, Newark, DE 19716 USA

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS | 2018年 / 5卷 / 03期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

RAY-ABSORPTION SPECTROSCOPY; STIRRED-FLOW EXPERIMENTS; SYNTHETIC BIRNESSITE; HEXAGONAL BIRNESSITE; ADSORPTION; DESORPTION; AS(III); SOILS; DIFFRACTION; MINERALS;

D O I：

10.1021/acs.estlett.8b00058

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The ability to predict coupled kinetic reactions of arsenic (As) that occur at the manganese oxide aqueous solution interface is crucial for management and remediation of As-contaminated sites worldwide. A quantitative understanding of the coupling between As oxidation and adsorption/desorption kinetics will enable us to more accurately predict the kinetic behavior of As. In this study, we developed a novel quantitative model for the coupled kinetics of As adsorption/desorption/oxidation on delta-MnO2. The kinetics of As(III) adsorption and oxidation on delta-MnO2 was studied using a stirred-flow method under varying influent As(III) concentrations. The model was able to account for the variations in As concentration, different binding behavior of As(III) and As(V), and flow rates. Our model quantitatively shows that the coupled As adsorption/desorption/oxidation processes are highly dependent on As mass loading rates on delta-MnO2. Our model suggests that the As(III) adsorption rate is much higher than its oxidation rate. Both As(III) oxidation and subsequent As(V) desorption may proceed with similar reaction rates and control the overall reaction rates, although As(V) desorption rates may be affected by As(V) re-adsorption. Our kinetic model contributes to prediction of the dynamic behavior of As when manganese oxides are present.

引用

页码：175 / 180

页数：11

共 27 条

[11] REACTION SCHEME FOR THE OXIDATION OF AS(III) TO AS(V) BY BIRNESSITE [J].