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Simultaneous redox conversion and sequestration of chromate(VI) and arsenite(III) by iron(III)-alginate based photocatalysis
Zhang, Weifang; Liu, Feng; Sun, Yonggang; Zhang, Jing; Hao, Zhengping
2019-12-15
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
ISSN0926-3373
Volume259Pages:-
AbstractMultiple heavy-metal ions (e.g. Cr(VI) and As(III)) normally co-exist in acid wastewater, making the wastewater treatment complicated. Herein, the synergistic redox conversion and removal of Cr(VI)/As(III) were effectively achieved by applying iron(III) cross-linking alginate hydrogel beads (Fe-SA) as photocatalyst under simulated sunlight. Results show that not only 100% of the Cr(VI)/As(III) redox conversion was obtained in 150 min at pH 3.0, but also the removal efficiency of the transformed products (Cr(III) and As(V)) was greatly enhanced to above 80% in a wide pH range of 3-7. The (CO2-)-C-center dot radicals, produced by the ligand to metal charge transfer (LMCT) excitations on Fe-SA, together with the phtocatalysis-generated Fe(II), was responsible for the Cr(VI) reduction. Meanwhile, (OH)-O-center dot originating from (CO2-)-C-center dot mainly contributed to the As(III) oxidation, as confirmed by electron paramagnetic resonance and the by-product of CO2. Moreover, Fe-SA composite presented excellent reusability and performance in treatment of Cr(VI)/As(III) in real waters.
Department环境纳米技术与健康效应重点实验室
KeywordFe(III)-alginate hydrogel beads Chromium Arsenic Simultaneous redox conversion Photocatalysis
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43212
Collection环境纳米技术与健康效应重点实验室
Affiliation1.Chinese Acad Sci, Key Lab Environm Nanotechnol & Hlth Effect, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Natl Engn Lab VOCs Pollut Control Mat & Technol, Beijing 101408, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Weifang,Liu, Feng,Sun, Yonggang,et al. Simultaneous redox conversion and sequestration of chromate(VI) and arsenite(III) by iron(III)-alginate based photocatalysis[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2019,259:-.
APA Zhang, Weifang,Liu, Feng,Sun, Yonggang,Zhang, Jing,&Hao, Zhengping.(2019).Simultaneous redox conversion and sequestration of chromate(VI) and arsenite(III) by iron(III)-alginate based photocatalysis.APPLIED CATALYSIS B-ENVIRONMENTAL,259,-.
MLA Zhang, Weifang,et al."Simultaneous redox conversion and sequestration of chromate(VI) and arsenite(III) by iron(III)-alginate based photocatalysis".APPLIED CATALYSIS B-ENVIRONMENTAL 259(2019):-.
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