Transformation of iodide by Fe(II) activated peroxydisulfate

被引:22
作者
Dong, Zijun [1 ]
Jiang, Chengchun [1 ]
Yang, Jingxin [2 ]
Zhang, Xi [1 ,3 ]
Dai, Weili [3 ]
Cai, Pengwei [1 ]
机构
[1] Shenzhen Polytech, Dept Bldg & Environm Engn, Shenzhen 518055, Peoples R China
[2] Guangzhou Univ, Inst Environm Res Greater Bay, Minist Educ, Key Lab Water Qual & Conservat Pearl River Delta, Guangzhou 510006, Guangdong, Peoples R China
[3] Nanchang Hongkong Univ, Key Lab Jiangxi Prov Persistent Pollutants Contro, Nanchang 330063, Jiangxi, Peoples R China
基金
中国国家自然科学基金;
关键词
Iodide; Iodate; Reactive iodine species; Sulfate radicals (SO4 center dot-); Peroxydisulfate (PDS); Fe (II); DISINFECTION BY-PRODUCTS; ZERO VALENT IRON; HYPOIODOUS ACID; DRINKING-WATER; PEROXYMONOSULFATE PMS; PERSULFATE OXIDATION; BROMATE FORMATION; SULFATE RADICALS; ORANGE G; DEGRADATION;
D O I
10.1016/j.jhazmat.2019.03.063
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This work investigates the transformation of iodide (I-) by Fe(II)-activated peroxydisulfate (PDS). The transformation of I- into iodate (IO3-) is a two-step process, involving reactive iodine species, such as hypoiodous acid (HOI), as a key intermediate, and IO3- as the final product. In the first step, SO4 center dot- produced by Fe(II)activated PDS is mainly responsible for the transformation of I- into HOI. In the second step, Fe(IV) formed by the reaction of Fe(III) with PDS is required, to facilitate the further oxidation of HOI to IO3-. The disproportionation of HOI and the oxidation by PDS alone contribute negligibly to IO3- formation. The IO3- yield increases to a maximum, before decreasing gradually, with increased PDS and Fe(II) dosages. The transformation of I- into IO(3)(-)is favored by lower pH and higher temperature, due to the greater SO4 center dot- production by the reaction of Fe(II) with PDS under these conditions. Humic acid, as a representative natural organic matter, scavenges the formed HOT to form iodinated disinfection byproducts, which largely inhibit the transformation of I- into IO3- . In addition, the transformation of I- into IO3- and iodinated disinfection byproducts by Fe(II) activated PDS was confirmed in the natural waters.
引用
收藏
页码:519 / 526
页数:8
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