Comparative study of Fe(II)/sulfite, Fe(II)/PDS and Fe(II)/PMS for p-arsanilic acid treatment: Efficient organic arsenic degradation and contrasting total arsenic removal

被引:25
作者
Gao, Yuan [1 ]
Luo, Yun [1 ]
Pan, Zhao [1 ]
Zeng, Zhu [2 ]
Fan, Wenxia [2 ]
Hu, Jingyu [1 ]
Zhang, Zhong [2 ]
Ma, Jinxing [2 ]
Zhou, Yang [2 ]
Ma, Jun [3 ]
机构
[1] Guangdong Univ Technol, Sch Civil & Transportat Engn, Guangzhou 510006, Guangdong, Peoples R China
[2] Guangdong Univ Technol, Sch Ecol Environm & Resources, Guangdong Prov Key Lab Water Qual Improvement & Ec, Guangzhou 510006, Peoples R China
[3] Harbin Inst Technol, Sch Environm, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China
基金
中国国家自然科学基金;
关键词
P-arsanilic acid (p-AsA); Arsenic; Fe(II)/sulfite; Fe(II)/PDS; Fe(II)/PMS; AQUEOUS-SOLUTION; CATALYZED OXIDATION; SULFUR(IV) OXIDES; ATOM TRANSFER; KINETICS; RADICALS; OXYGEN; ADSORPTION; MECHANISM; SYSTEM;
D O I
10.1016/j.watres.2023.120967
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
As a widely used feed additives, p-arsanilic acid (p-AsA) frequently detected in the environment poses serious threats to aquatic ecology and water security due to its potential in releasing more toxic inorganic arsenic. In this work, the efficiency of Fe(II)/sulfite, Fe(II)/PDS and Fe(II)/PMS systems in p-AsA degradation and simultaneous arsenic removal was comparatively investigated for the first time. Efficient p-AsA abatement was achieved in theses Fe-based systems, while notable discrepancy in total arsenic removal was observed under identical acidic condition. By using chemical probing method, quenching experiments, isotopically labeled water experiments, p-AsA degradation was ascribed to the combined contribution of high-valent Fe(IV) and SO4 center dot- in these Fe(II)-based system. In particular, the relative contribution of Fe(IV) and SO4 center dot- in the Fe(II)/sulfite system was highly dependent on the molar ratio of [Fe(II)] and [sulfite]. Negligible arsenic removal was observed in the Fe(II)/ sulfite and Fe(II)/PDS systems, while similar to 80% arsenic was removed in the Fe(II)/PMS system under identical acidic condition. This interesting phenomenon was due to that ferric precipitation only occurred in the Fe(II)/PMS system. As(V) was further removed via adsorption onto the iron precipitate or the formation of ferric arsenatesulfate compounds, which was confirmed by particle diameter measurements, fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Through tuning solution pH, complete removal of total arsenic could achieve in all three systems. Among these three Fe-based technologies, the hybrid oxidation-coagulation Fe (II)/PMS system demonstrated potential superiority for arsenic immobilization by not requiring pH adjustment for coagulation and facilitating the in-situ generation of ferric arsenate-sulfate compounds with comparably low solubility levels like scorodite. These findings would deepen the understanding of these three Fe-based Fentonlike technologies for decontamination in water treatment.
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页数:9
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