Efficient degradation of sulfamethoxazole by the Fe(II)/HSO5- process enhanced by hydroxylamine: Efficiency and mechanism

JOURNAL OF HAZARDOUS MATERIALS

卷:322

Article

Liu, Guifang^1,2  Li, Xuchun³  Han, Bangjun^4,5  Chen, Liwei⁶  Zhu, Linan¹  Campos, Luiza C.² 

[1] Harbin Engn Univ, Coll Aerosp & Civil Engn, Harbin 150001, Peoples R China

[2] UCL, Dept Civil Engn & Geomat Engn, London WC1E 6BT, England

[3] Zhejiang Gongshang Univ, Sch Environm Sci & Engn, Hangzhou 310018, Peoples R China

[4] Heilongjiang Univ, Sch Civil Engn, Harbin 150080, Peoples R China

[5] Natl Engn Res Ctr Urban Water Resources, Harbin 150090, Peoples R China

[6] Nanjing Forestry Univ, Coll Biol & Environm, Nanjing 210037, Jiangsu, Peoples R China

关键词: Sulfate radical;    Hydroxyl radical;    Peroxomonosulfate;    Hydroxylamine;    Sulfamethoxazole;   

DOI  :  10.1016/j.jhazmat.2016.09.062

来源: Elsevier

【 摘 要 】

Fenton or Fenton-like processes have been regarded as feasible methods to degrade a wide variety of contaminants by generating reactive species, but the efficiency is still challenged by the slow transformation from Fe(III) to Fe(II) and pH. This study employed hydroxylamine (HA) to improve the oxidation efficiency of Fe(II)/HSO5- (Fe(II)/PMS) process, by selecting sulfamethoxazole (SMX) as the target compound. The degradation efficiency and mechanism of SMX by the HA/Fe(II)/PMS process were elucidated for the first time. Compared with Fe(II)/PMS process, the HA/Fe(II)/PMS process showed about 4 times higher degradation efficiency of SMX at pH 3.0. The analysis of steady-state concentration of Fe species indicated that HA enhanced the transformation of Fe(III) to Fe(II), sustaining the rapid Fenton-like reactions. Both sulfate radicals and hydroxyl radicals accounted for the degradation of SMX, with the latter regarded as the dominant reactive species. Degradation intermediates of SMX were further analyzed, and three main transformation pathways were thus proposed. The HA/Fe(II)/PMS process was also effective in the removal of SMX and total organic carbon from real pharmaceutical wastewater. This work would broaden the scope of application of Fenton and Fenton-like processes enhanced by HA in contaminants treatment. (C) 2016 Elsevier B.V. All rights reserved.

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