Effect of Fe loading quantity on reduction reactivity of nano zero-valent iron supported on chelating resin

被引：7
作者：
Shi, Jialu [1 ]
Yi, Shengnan [1 ]
Long, Chao [1 ]
Li, Aimin [1 ]
机构：
[1] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Jiangsu, Peoples R China
来源：
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING | 2015年 / 9卷 / 05期
关键词：
nanoscale zero valent iron; loading quantity; reduction; chelating resin; bromated; NANOSCALE ZEROVALENT IRON; HEAVY-METAL IONS; NITRATE REDUCTION; GRANULAR IRON; NANOPARTICLES; BROMATE; DECHLORINATION; ADSORPTION; PARTICLES; KINETICS;
D O I：
10.1007/s11783-015-0781-2
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this study, nanoscale zero-valent iron (NZVI) were immobilized within a chelating resin (DOW 3N). To investigate the effect of Fe loading on NZVI reactivity, three NZVI-resin composites with different Fe loading were obtained by preparing Fe(III) solution in 0, 30 and 70% (v/v) ethanol aqueous, respectively; the bromate was used as a model contaminant. TEM reveals that increasing the Fe loading resulted in much larger size and poor dispersion of nanoscale iron particles. The results indicated that the removal efficiency of bromate and the rate constant (K (obs)) were decreased with increasing the Fe loading. For the NZVI-resin composite with lower Fe loading, the removal efficiency of bromate declined more significantly with the increase of DO concentrations. Under acidic conditions, decreasing the pH value had the most significant influence on NZVIR3 with highest Fe loading for bromate removal; however, under alkaline conditions, the most significant influence of pH was on NZVI-R1 with lowest Fe loading. The effects of co-existing anions NO (3) (-) , PO (4) (3-) and HCO (3) (-) were also investigated. All of the co-existing anions showed the inhibition to bromate reduction.
引用
收藏
页码：840 / 849
页数：10
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