标题: Visible light-driven oxidation of arsenite, sulfite and thiazine dyes: A new strategy for using waste to treat waste
作者: Luo, T (Luo, Tao); Wang, H (Wang, Hao); Chen, L (Chen, Long); Li, JJ (Li, Jinjun); Wu, F (Wu, Feng); Zhou, DN (Zhou, Danna)
来源出版物: JOURNAL OF CLEANER PRODUCTION 卷: 280 文献号: 124374 DOI: 10.1016/j.jclepro.2020.124374 子辑: 1 出版年: JAN 20 2021
摘要: Recently, the advanced oxidation processes (AOPs) based on sulfate radical (SO4 center dot-) using sulfite has received increasing concerns. Metal-free activation of sulfite is still in urgent demands from the perspective of cleaner production since the reported efficient systems containing sulfite has been relied on the transition metals. In this work, methylene blue (MB+), a well-known photosensitizer and thiazine dye contaminant, was utilized to activate sulfite for the efficient photooxidation of arsenite (As(III)) to arsenate (As(V)) under visible light (LED lamps with wavelength 640 nm) and sunlight, respectively. The initial oxidation rates of 5-40 mu M As(III) are 28-folde116-fold as that of the decolorization of 0.27 mu M MB+ with 50 mu M sulfite at pH 7.3. The maximum stoichiometric ratio MB+: As(III): sulfite was obtained to be 1 : 142: 247, suggesting an efficient utilization of both MB+ and sulfite as waste resources. The electrical energy per order (EE/O) index was calculated to be 1.83 x 10(-3) kWh L-1 for the visible light-MB+-sulfite system, which is much less than those reported systems. Oxysulfur radicals (mainly peroxymonosulfate radical, SO5 center dot-) produced in this photochemical system are responsible for As(III) oxidation. The other two common thiazine dyes (thionine and Azure B) are also capable of activating sulfite for As(III) oxidation due to the same chromophores. Thus the novel strategy of using waste sulfite and the thiazine dyes is promising for As(III) oxidation under sunlight, with which low-concentration wastes of thiazine dye and sulfite can be utilized to achieve the goal of cleaner production. (C) 2020 Elsevier Ltd. All rights reserved.
作者关键词: Methylene blue; Sulfite; Advanced oxidation processes; Arsenic; Wastewater treatment
地址: [Luo, Tao; Wang, Hao; Chen, Long; Li, Jinjun; Wu, Feng] Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.
[Chen, Long] Northeastern Univ, Dept Civil & Environm Engn, Boston, MA 02115 USA.
[Zhou, Danna] China Univ Geosci, Fac Mat Sci & Chem, Wuhan 430074, Peoples R China.
通讯作者地址: Chen, L; Wu, F (通讯作者)，Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.
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