Magnetic MoS2/Fe3O4 composite as an effective activator of persulfate for the degradation of tetracycline: performance, activation mechanisms and degradation pathways
The activated persulfate (PS) process could produce sulfate radical (SO4·-) and rapidly degrade organic pollutants. The application of Fe3O4 as a promising PS activator was limited due to the rapid conversion of Fe2+ to Fe3+ on its surface. Mo4+ on MoS2 surface could be used as a reducing site to co...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2024-04-01
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| Series: | Water Science and Technology |
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| Online Access: | http://wst.iwaponline.com/content/89/7/1860 |
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| author | Lanhe Zhang Qi Zhang Tengyue Chen Changyao Wang Chuan Xiao Jingbo Guo Xiangrui Pang Shuhua Liu |
| author_facet | Lanhe Zhang Qi Zhang Tengyue Chen Changyao Wang Chuan Xiao Jingbo Guo Xiangrui Pang Shuhua Liu |
| author_sort | Lanhe Zhang |
| collection | DOAJ |
| description | The activated persulfate (PS) process could produce sulfate radical (SO4·-) and rapidly degrade organic pollutants. The application of Fe3O4 as a promising PS activator was limited due to the rapid conversion of Fe2+ to Fe3+ on its surface. Mo4+ on MoS2 surface could be used as a reducing site to convert Fe3+ to Fe2+, but the separation and recovery of MoS2 was complex. In this study, MoS2/Fe3O4 was prepared to accelerate the Fe3+/Fe2+ cycle on Fe3O4 surface and achieved efficient separation of MoS2. The results showed that MoS2/Fe3O4 was more effective for PS activation compared to Fe3O4 or MoS2, with a removal efficiency of 91.8% for 20 mg·L−1 tetracycline (TC) solution under the optimal conditions. Fe2+ and Mo4+ on MoS2/Fe3O4 surface acted as active sites for PS activation with the generation of SO4•−, •OH, •O2−, and 1O2. Mo4+ acted as an electron donor to promote the Fe3+/Fe2+ cycling and thus improved the PS activation capability of MoS2/Fe3O4. The degradation pathways of TC were inferred as hydroxylation, ketylation of dimethylamino group and C-N bond breaking. This study provided a promising activated persulfate-based advanced oxidation process for the efficient degradation of TC by employing MoS2/Fe3O4 as an effective activator.
HIGHLIGHTS
MoS2/Fe3O4 was an effective, recoverable PS activator for tetracycline degradation.;
TC was removed by free radical and non-free radical degradation pathways.;
Mo4+ promoted the regeneration of Fe2+ on the Fe3O4 surface.; |
| first_indexed | 2024-04-24T07:36:43Z |
| format | Article |
| id | doaj.art-cbd961061b6a4e6591b6ffd30a861943 |
| institution | Directory Open Access Journal |
| issn | 0273-1223 1996-9732 |
| language | English |
| last_indexed | 2024-04-24T07:36:43Z |
| publishDate | 2024-04-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Science and Technology |
| spelling | doaj.art-cbd961061b6a4e6591b6ffd30a8619432024-04-20T06:08:39ZengIWA PublishingWater Science and Technology0273-12231996-97322024-04-018971860187810.2166/wst.2024.076076Magnetic MoS2/Fe3O4 composite as an effective activator of persulfate for the degradation of tetracycline: performance, activation mechanisms and degradation pathwaysLanhe Zhang0Qi Zhang1Tengyue Chen2Changyao Wang3Chuan Xiao4Jingbo Guo5Xiangrui Pang6Shuhua Liu7 School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China School of Environment, Liaoning University, Shenyang 110036, China Jilin Power Supply Company, State Grid Jilin Electric Power Co., Ltd, Jilin 132000, China The activated persulfate (PS) process could produce sulfate radical (SO4·-) and rapidly degrade organic pollutants. The application of Fe3O4 as a promising PS activator was limited due to the rapid conversion of Fe2+ to Fe3+ on its surface. Mo4+ on MoS2 surface could be used as a reducing site to convert Fe3+ to Fe2+, but the separation and recovery of MoS2 was complex. In this study, MoS2/Fe3O4 was prepared to accelerate the Fe3+/Fe2+ cycle on Fe3O4 surface and achieved efficient separation of MoS2. The results showed that MoS2/Fe3O4 was more effective for PS activation compared to Fe3O4 or MoS2, with a removal efficiency of 91.8% for 20 mg·L−1 tetracycline (TC) solution under the optimal conditions. Fe2+ and Mo4+ on MoS2/Fe3O4 surface acted as active sites for PS activation with the generation of SO4•−, •OH, •O2−, and 1O2. Mo4+ acted as an electron donor to promote the Fe3+/Fe2+ cycling and thus improved the PS activation capability of MoS2/Fe3O4. The degradation pathways of TC were inferred as hydroxylation, ketylation of dimethylamino group and C-N bond breaking. This study provided a promising activated persulfate-based advanced oxidation process for the efficient degradation of TC by employing MoS2/Fe3O4 as an effective activator. HIGHLIGHTS MoS2/Fe3O4 was an effective, recoverable PS activator for tetracycline degradation.; TC was removed by free radical and non-free radical degradation pathways.; Mo4+ promoted the regeneration of Fe2+ on the Fe3O4 surface.;http://wst.iwaponline.com/content/89/7/1860activationfe3o4mos2persulfatetetracycline |
| spellingShingle | Lanhe Zhang Qi Zhang Tengyue Chen Changyao Wang Chuan Xiao Jingbo Guo Xiangrui Pang Shuhua Liu Magnetic MoS2/Fe3O4 composite as an effective activator of persulfate for the degradation of tetracycline: performance, activation mechanisms and degradation pathways Water Science and Technology activation fe3o4 mos2 persulfate tetracycline |
| title | Magnetic MoS2/Fe3O4 composite as an effective activator of persulfate for the degradation of tetracycline: performance, activation mechanisms and degradation pathways |
| title_full | Magnetic MoS2/Fe3O4 composite as an effective activator of persulfate for the degradation of tetracycline: performance, activation mechanisms and degradation pathways |
| title_fullStr | Magnetic MoS2/Fe3O4 composite as an effective activator of persulfate for the degradation of tetracycline: performance, activation mechanisms and degradation pathways |
| title_full_unstemmed | Magnetic MoS2/Fe3O4 composite as an effective activator of persulfate for the degradation of tetracycline: performance, activation mechanisms and degradation pathways |
| title_short | Magnetic MoS2/Fe3O4 composite as an effective activator of persulfate for the degradation of tetracycline: performance, activation mechanisms and degradation pathways |
| title_sort | magnetic mos2 fe3o4 composite as an effective activator of persulfate for the degradation of tetracycline performance activation mechanisms and degradation pathways |
| topic | activation fe3o4 mos2 persulfate tetracycline |
| url | http://wst.iwaponline.com/content/89/7/1860 |
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