Ca-alginate-entrapped nanoscale iron: arsenic treatability and mechanism studies

被引:44
作者
Bezbaruah, Achintya N. [1 ]
Kalita, Harjyoti [2 ,3 ]
Almeelbi, Talal [4 ]
Capecchi, Christopher L. [1 ]
Jacob, Donna L. [5 ]
Ugrinov, Angel G. [6 ]
Payne, Scott A. [7 ]
机构
[1] N Dakota State Univ, Dept Civil Environm Engn, Nanoenvirol Res Grp, Dept 2470, Fargo, ND 58108 USA
[2] N Dakota State Univ, Dept 2470, Ctr Nanoscale Sci & Engn, Fargo, ND 58108 USA
[3] N Dakota State Univ, Dept 2470, Dept Civil Engn, Fargo, ND 58108 USA
[4] King Adulaziz Univ, Ctr Excellence Environm Studies, Jeddah 21589, Saudi Arabia
[5] N Dakota State Univ, Dept Biol Sci, Wetland Ecol Lab, Dept 2715, Fargo, ND 58108 USA
[6] N Dakota State Univ, Dept Chem & Biochem, Dept 2735, Fargo, ND 58108 USA
[7] N Dakota State Univ, Electron Microscopy Ctr, Fargo, ND 58108 USA
基金
美国国家科学基金会;
关键词
Iron nanoparticles; Alginate beads; Entrapment; Arsenic; Groundwater remediation; Environmental effects; ZERO-VALENT IRON; ZEROVALENT IRON; REMOVAL; NANOPARTICLES; GROUNDWATER; DEGRADATION; OXIDATION; DECHLORINATION; KINETICS; WATER;
D O I
10.1007/s11051-013-2175-3
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The use of nanoscale zero-valent iron (NZVI, diameter 10-90 nm with an average value of 35 nm) entrapped in calcium (Ca)-alginate beads shows great promise for aqueous arsenic treatment. This research evaluated Ca-alginate-entrapped NZVI as an advanced treatment technique for aqueous arsenic removal. Arsenic is a serious threat to human health and millions of people are affected by arsenic contamination in various parts of the world including the USA. In bench scale batch studies with initial As(V) concentrations of 1-10 mg L-1, 85-100 % arsenic removal was achieved within 2 h. While the reaction kinetics differ between bare and entrapped NZVI, the overall reductions of arsenic are comparable. Surface area-normalized arsenic reduction reaction rate constants (k (sa)) for bare and entrapped NZVI were 3.40-5.96 x 10(-3) and 3.92-4.43 x 10(-3) L m(-2) min(-1), respectively. The entrapped NZVI removed 100 mu g L-1 As(V) to below detection limit within 2 h and groundwater with 53 mu g L-1 As(V) was remediated to below instrument detection limit (10 mu g L-1) within 1 h. The presence of Na+, Ca2+, Cl-, and did not affect arsenic removal by entrapped NZVI and there was no leaching of iron from the beads. X-ray diffraction and Fourier transform infrared spectroscopic techniques have been used to understand the mechanism of arsenic removal by the entrapped NZVI. Ca-alginate polymer is an excellent choice as an entrapment medium as it is non-toxic and has little solubility in water.
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页数:10
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