Reductive Removal of Selenate in Water Using Stabilized Zero-Valent Iron Nanoparticles

被引：11
|
作者：
Liu, Hongfang [1 ,2 ,3 ]
Cai, Zhengqing [3 ]
Zhao, Xiao [3 ]
Zhao, Dongye [3 ]
Qian, Tianwei [2 ]
Bozack, Michael [4 ]
Zhang, Mingang [1 ]
机构：
[1] Taiyuan Univ Sci & Technol, Sch Mat Sci & Engn, Taiyuan 030024, Shanxi, Peoples R China
[2] Taiyuan Univ Sci & Technol, Sch Environm & Safety, Taiyuan 030024, Shanxi, Peoples R China
[3] Auburn Univ, Dept Civil Engn, Environm Engn Program, Auburn, AL 36849 USA
[4] Auburn Univ, Dept Phys, Auburn, AL 36849 USA
来源：
WATER ENVIRONMENT RESEARCH | 2016年 / 88卷 / 08期
基金：
中国国家自然科学基金;
关键词：
nanoparticle; selenium; zero-valent iron; reductive; immobilization; water treatment; remediation; FE-PD NANOPARTICLES; CARBOXYMETHYL CELLULOSE; SELENITE REDUCTION; AQUEOUS-SOLUTION; ZEROVALENT IRON; IMMOBILIZATION; ADSORPTION; REACTIVITY; TRANSPORT; SORPTION;
D O I：
10.2175/106143016X14609975746929
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Polysaccharide-stabilized zero-valent iron (ZVI) nanoparticles were synthesized using sodium carboxymethyl cellulose (CMC) or starch as stabilizer, and tested for reductive removal of selenate in water. Batch kinetic tests showed that the stabilized ZVI nanoparticles offer much faster selenate removal than bare ZVI particles at both pH 6.0 and pH 8.4. X-ray photoelectron spectroscopy (XPS) analyses confirmed Se(VI) was transformed to Se(IV) and Se(0), which are removed along with the nanoparticles. Neutral pH(similar to 7) was found to be most favorable for the reductive removal. Decreasing pH to 5.0 or increasing it to 8.0 reduced the removal rate of CMC-stabilized ZVI by a factor of 4.6 or 1.3, respectively, based on the observed first-order-rate constant. Dissolved organic matter (DOM) at 5 mg/L as total organic carbon (TOC) had modest inhibitive effect, but DOM at 25 mg/L TOC decreased selenate removal by 25%. The stabilized nanoparticles hold the potential to facilitate in situ remediation of selenate-contaminated soil and groundwater.
引用
收藏
页码：694 / 703
页数：10
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