Effect of Fenton-Based Processes on Arsenic Removal in the Presence of Humic Acid
Geogenic arsenic (As) contamination in groundwater poses a significant public health risk in many regions worldwide. Previous studies have reported hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) concentrations ranging from 5.8 to 96 μmol L<sup>−1</sup> in rainwate...
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MDPI AG
2024-11-01
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| author | Wenming Xiong Qixuan Huang Langlang Li Yongjun Li |
| author_facet | Wenming Xiong Qixuan Huang Langlang Li Yongjun Li |
| author_sort | Wenming Xiong |
| collection | DOAJ |
| description | Geogenic arsenic (As) contamination in groundwater poses a significant public health risk in many regions worldwide. Previous studies have reported hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) concentrations ranging from 5.8 to 96 μmol L<sup>−1</sup> in rainwater, which may contribute to the oxidation and removal of As. However, the influence of natural organic matter, such as humic acid (HA), on rainwater-borne H<sub>2</sub>O<sub>2</sub>-induced Fenton processes for the oxidation and removal of As remains unclear. In this study, the Fenton process was employed to investigate changes in As(V), As(III), and their mixtures, both in the presence and absence of HA. The results showed that low concentrations of HA (0–10 mg/L) promoted the oxidation of As(III) and removal of As(V) when As(V) and As(III) were present individually. However, when As(V) and As(III) coexisted, HA inhibited the Fenton process for As(V) removal. This inhibition was likely due to As(III) competing strongly with HA for hydroxyl radicals in the Fenton reaction system. Additionally, the presence of HA hindered the Fe(III)-driven removal of As(V), a product of the Fenton reaction. These findings further enhance our understanding of the potential role of rainwater-borne H<sub>2</sub>O<sub>2</sub> in the transformation of As species in open water environments. |
| format | Article |
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| institution | Kabale University |
| issn | 2305-6304 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
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| spelling | doaj-art-7a6f3f9c8a3849eb90e83cf600db720f2024-12-27T14:56:35ZengMDPI AGToxics2305-63042024-11-01121284510.3390/toxics12120845Effect of Fenton-Based Processes on Arsenic Removal in the Presence of Humic AcidWenming Xiong0Qixuan Huang1Langlang Li2Yongjun Li3Guangzhou Vocational College of Technology & Business, Guangzhou 511442, ChinaGuangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, ChinaGuangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, ChinaGuangzhou Vocational College of Technology & Business, Guangzhou 511442, ChinaGeogenic arsenic (As) contamination in groundwater poses a significant public health risk in many regions worldwide. Previous studies have reported hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) concentrations ranging from 5.8 to 96 μmol L<sup>−1</sup> in rainwater, which may contribute to the oxidation and removal of As. However, the influence of natural organic matter, such as humic acid (HA), on rainwater-borne H<sub>2</sub>O<sub>2</sub>-induced Fenton processes for the oxidation and removal of As remains unclear. In this study, the Fenton process was employed to investigate changes in As(V), As(III), and their mixtures, both in the presence and absence of HA. The results showed that low concentrations of HA (0–10 mg/L) promoted the oxidation of As(III) and removal of As(V) when As(V) and As(III) were present individually. However, when As(V) and As(III) coexisted, HA inhibited the Fenton process for As(V) removal. This inhibition was likely due to As(III) competing strongly with HA for hydroxyl radicals in the Fenton reaction system. Additionally, the presence of HA hindered the Fe(III)-driven removal of As(V), a product of the Fenton reaction. These findings further enhance our understanding of the potential role of rainwater-borne H<sub>2</sub>O<sub>2</sub> in the transformation of As species in open water environments.https://www.mdpi.com/2305-6304/12/12/845Fenton-based processesarsenic removalthe presence of humic acid |
| spellingShingle | Wenming Xiong Qixuan Huang Langlang Li Yongjun Li Effect of Fenton-Based Processes on Arsenic Removal in the Presence of Humic Acid Toxics Fenton-based processes arsenic removal the presence of humic acid |
| title | Effect of Fenton-Based Processes on Arsenic Removal in the Presence of Humic Acid |
| title_full | Effect of Fenton-Based Processes on Arsenic Removal in the Presence of Humic Acid |
| title_fullStr | Effect of Fenton-Based Processes on Arsenic Removal in the Presence of Humic Acid |
| title_full_unstemmed | Effect of Fenton-Based Processes on Arsenic Removal in the Presence of Humic Acid |
| title_short | Effect of Fenton-Based Processes on Arsenic Removal in the Presence of Humic Acid |
| title_sort | effect of fenton based processes on arsenic removal in the presence of humic acid |
| topic | Fenton-based processes arsenic removal the presence of humic acid |
| url | https://www.mdpi.com/2305-6304/12/12/845 |
| work_keys_str_mv | AT wenmingxiong effectoffentonbasedprocessesonarsenicremovalinthepresenceofhumicacid AT qixuanhuang effectoffentonbasedprocessesonarsenicremovalinthepresenceofhumicacid AT langlangli effectoffentonbasedprocessesonarsenicremovalinthepresenceofhumicacid AT yongjunli effectoffentonbasedprocessesonarsenicremovalinthepresenceofhumicacid |