Implications for practical application of commercial reduced iron powders to activate aqueous sulfite for decontamination of organics

Arabian Journal of Geosciences volume 14, Article number: 221 (2021) Cite this article

Abstract

Sulfate radicals (SO4•−) based advanced oxidation processes (AOPs), with high efficiency and selectivity toward degradation of refractory organic contaminants, have captured increasing worldwide attention. Here, an efficient advanced oxidation process based on SO4•− (i.e., a CRI/S(IV) process), induced by commercial reduced iron (CRI) powder-induced aqueous sulfite [S(IV)] activation for favorable degradation of refractory organics, is reported. The CRI/S(IV) coupled system efficiently decomposes rhodamine B (RhB) and 4-chlorophenol (4-CP) at weakly acidic and even neutral pHs. The distributions of active sulfur and iron species distribution in the CRI/S(IV) system were investigated and implied that HSO3−, FeHSO3+ and FeSO3+ were the main active species for S(IV), Fe(II), and Fe(III), respectively. In addition, radical quenching experiments show that both SO4•− and hydroxyl radicals (•OH) are present in this CRI/S(IV) system with SO4•− as the dominant reactive radical for contamination removal. Furthermore, this novel process surpassed both CRI/Oxone and CRI/persulfate systems towards the organic degradation. This work might provide an implication for an efficient practical route for SO4•− activation for wastewater decontamination, particularly for sulfite contaminated wastewaters with recalcitrant organic contaminants.

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Acknowledgments

The present work was financially supported by Shanghai Sailing Program (18YF1429900, 19YF1459900, and 15YF1404300), Natural Science Foundation of China (51678353, 52070127), Shanghai Natural Science Foundation (20ZR1421100), Central Public-interest Scientific Institution Basal Research Fund, ECSFR, CAFS (2019T14, 2019T13), Cultivation Discipline Fund of Shanghai Polytechnic University (XXKPY1601), and Gaoyuan Discipline of Shanghai-Environmental Science and Engineering (Resource Recycling Science and Engineering). Dr. Guo also acknowledges the Shanghai Teacher Professional Development Project (A11NH190713), Project of Key Undergraduate Courses (Instrumental Analysis) from Shanghai Municipal Education Committee.

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Affiliations

  1. Laboratory of Quality Safety and Processing for Aquatic Product, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai, 200090, China

    Xiaoyi Lou, Changling Fang & Huijuan Yu

  2. Research Center of Resource Recycling Science and Engineering, School of Environmental and Materials Engineering, Shanghai Polytechnic University, Shanghai, 201209, China

    Yaoguang Guo & Jie Guan

  3. Department of Physics, City University of Hong Kong, Hong Kong, 999077, SAR, China

    Yaoguang Guo

  4. State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China

    Tianyi Zhou

  5. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, China

    Xuefeng Zhu

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  1. Xiaoyi Lou
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Lou, X., Fang, C., Guo, Y. et al. Implications for practical application of commercial reduced iron powders to activate aqueous sulfite for decontamination of organics. Arab J Geosci 14, 221 (2021). https://doi.org/10.1007/s12517-021-06589-3

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Keywords

  • Sulfate radicals
  • Advanced oxidation processes
  • Decontamination
  • Radical quenching