Magnetically recyclable and remarkably efficient visible-light-driven photocatalytic hexavalent chromium removal based on plasmonic biochar/bismuth/ferroferric oxide heterojunction

被引：46
作者：
Shen, Xiaofeng [1 ]
Yang, Ye [1 ]
Song, Bingtao [1 ]
Chen, Fan [1 ]
Xue, Qingquan [2 ]
Shan, Shengdao [1 ]
Li, Shijie [3 ]
机构：
[1] Zhejiang Univ Sci & Technol, Sch Environm & Nat Resources, Key Lab Recycling & Ecotreatment Waste Biomass Zh, Hangzhou 310023, Zhejiang, Peoples R China
[2] Donghua Univ, Coll Mat Sci & Engn, Shanghai 201620, Peoples R China
[3] Zhejiang Ocean Univ, Natl Engn Res Ctr Marine Aquaculture, Inst Innovat & Applicat, Zhoushan 316022, Zhejiang, Peoples R China
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2021年 / 590卷
基金：
中国国家自然科学基金;
关键词：
Biochar; Bi/Fe3O4; Surface plasmon resonance; Photocatalysis; Photoelectrocatalysis; CARBON-FIBER CLOTH; MEMBRANE-SHAPED PHOTOCATALYST; NANOPARTICLES; MICROSPHERES; DEGRADATION; PERFORMANCE; CR(VI); WATER; CO2; NANOCOMPOSITES;
D O I：
10.1016/j.jcis.2021.01.095
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：
The development of easily recyclable non-noble metal plasmonic photocatalysts with high performance is highly desired for the removal of Cr(VI). Herein, the in-situ growth of plasmonic-bismuth (Bi) combined with magnetic ferroferric (Fe3O4) nanoparticles on biochar (BC) was realized by a facile high temperature calcination. BC/Bi/Fe3O4 exhibits broad photoabsorption from 200 to 2000 nm. The weaker photoluminescence (PL) spectrum or stronger photocurrent density confirmed its higher separation efficiency of photogenerated carriers than that of BC or Bi/Fe3O4. Under visible light irradiation, BC/Bi/Fe3O4 exhibits excellent adsorption-photocatalytic performance for Cr(VI) (95%) in 180 min. With BC/Bi/Fe3O4 as a working electrode, the higher removal efficiency (97%) was achieved than that using BC/Bi (65%), BC/Fe3O4 (79%) or Bi/Fe3O4 (66%) after 160 min under visible light irradiation, rooting from wide spectral absorption and efficient separation of photogenerated carriers. BC/Bi/Fe3O4 can be easily recycled by magnetism with good stability. This work not only provides ideas for the preparation of surface plasma resonance (SPR) semiconductor photocatalyst for removing heavy metal, but also realizes the resource utilization of agricultural and forestry waste. (C) 2021 Elsevier Inc. All rights reserved.
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页码：424 / 435
页数：12
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