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Oxidation of aniline aerofloat in flotation wastewater by sodium hypochlorite solution

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Abstract

Aniline aerofloat (dianilinodithiophosphoric acid (C6H5NH)2PSSH) is a widely used phosphorodithioic organic flotation collector that contains aniline groups and dithiophosphate groups. In the present study, sodium hypochlorite solution was used to oxidize aniline aerofloat. The effect of operational parameters and optimum oxidation conditions on aniline aerofloat was studied, and the oxidation pathway of aniline aerofloat was proposed by analyzing its main oxidation intermediates. The results showed that NaOCl concentration had a significant influence on aniline aerofloat oxidation and at 100 mg/L aniline aerofloat, 84.54 % was removed under the following optimal conditions: NaOCl concentration = 1.25 g/L, pH = 4, and reaction time = 60 min. The main reaction of aniline aerofloat by NaOCl included N-P bond cleavage, aniline group oxidation, aniline group chlorination, and dithiophosphate group oxidation. The initial reaction was the N-P bond cleavage and the anilines and dithiophosphate was further oxidized to other intermediates by five parallel reaction pathways.

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Acknowledgments

This work was supported by Education Special Funds of the University Discipline Construction of Guangdong Province (Grant No. 2014KTSP022), Nature Science Foundation of Guangdong (2015A030303003) and Science and Technology project of Guangdong (2014B020216009).

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Authors and Affiliations

  1. School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China

    Weixiong Lin, Jing Tian, Jie Ren, Pingting Xu, Yongkang Dai & Shuiyu Sun

  2. Guangdong Weizhong Testing Technology Co., Ltd., Guangzhou, Guangdong, China

    Chun Wu

Authors
  1. Weixiong Lin
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  2. Jing Tian
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  3. Jie Ren
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  4. Pingting Xu
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  5. Yongkang Dai
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  6. Shuiyu Sun
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  7. Chun Wu
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Corresponding author

Correspondence to Shuiyu Sun.

Additional information

Responsible editor: Santiago V. Luis

The highlights of the study are as follows:

1. The effect of operational parameters on aniline aerofloat oxidation is evaluated.

2. The optimum oxidation conditions are obtained.

3. The intermediates of aniline aerofloat are identified and the possible oxidation pathways of aniline aerofloat are firstly proposed.

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Lin, W., Tian, J., Ren, J. et al. Oxidation of aniline aerofloat in flotation wastewater by sodium hypochlorite solution. Environ Sci Pollut Res 23, 785–792 (2016). https://doi.org/10.1007/s11356-015-5319-4

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  • DOI: https://doi.org/10.1007/s11356-015-5319-4

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