Oxalate enhanced synergistic removal of chromium(VI) and arsenic(III) over ZnFe2O4/g-C3N4: Z-scheme charge transfer pathway and photo-Fenton like reaction

被引：151
作者：
Lei, Dashi [1 ]
Xue, Juanqin [1 ,2 ]
Peng, Xiangyu [3 ]
Li, Shuhao [1 ]
Bi, Qiang [2 ]
Tang, Changbin [2 ]
Zhang, Liang [2 ]
机构：
[1] Xian Univ Architecture & Technol, Coll Met Engn, Xian 710055, Peoples R China
[2] Xian Univ Architecture & Technol, Dept Chem Engn, Xian 710055, Peoples R China
[3] Northeastern Univ, Sch Resources & Civil Engn, Shenyang 110819, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2021年 / 282卷
基金：
中国国家自然科学基金;
关键词：
Direct Z-scheme photocatalyst; Oxalate; Cr(VI) reduction; As(III) oxidation; ACID-MINE DRAINAGE; REDOX CONVERSION; PHOTOCATALYTIC REDUCTION; OXALIC-ACID; CR(VI); OXIDATION; AS(III); FERRIHYDRITE; NANOSHEETS; PHOTODEGRADATION;
D O I：
10.1016/j.apcatb.2020.119578
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work, direct Z-Scheme photocatalyst (ZnFe2O4/g-C3N4) was employed to purify Cr(VI) and As(III) in wastewater. Results showed that Cr(VI) and As(III) was completely removed in a wide pH range of 3-7 under visible light irradiation. During photo reaction, oxalate enhanced the generation of Fe(II) and center dot CO2-, which were beneficial for formation of 'OH and center dot O-2(-). In photocatalytic system, Fe(II), photogenerated electron, as well as center dot CO2- contributed to Cr(VI) reduction, center dot OH and center dot O-2(-) were responsible for treatment of As(III). Moreover, ZnFe2O4/g-C3N4 was easily recycled by magnetic separation, and presented an excellent reuse ability in treatment of Cr(VI) and As(III).
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页数：12
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