Degradation of methyl orange by pyrite activated persulfate oxidation: mechanism, pathway and influences of water substrates
Degradation mechanism of methyl orange (MO), a typical azo dye, with pyrite (FeS2) activated persulfate (PS) was explored. The results showed that when the initial concentration of MO was 0.1 mM, FeS2 was 1.6 g/L and PS was 1.0 mM, the removal rate of MO could reach 92.9% in 150 min, and the removal...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2022-05-01
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| Series: | Water Science and Technology |
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| Online Access: | http://wst.iwaponline.com/content/85/10/2912 |
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| author | Hui Liu Fenwu Liu Jian Zhang Jiaxing Zhou Wenlong Bi Junmei Qin Qingjie Hou Yue Ni Shaozu Xu Chen Yang |
| author_facet | Hui Liu Fenwu Liu Jian Zhang Jiaxing Zhou Wenlong Bi Junmei Qin Qingjie Hou Yue Ni Shaozu Xu Chen Yang |
| author_sort | Hui Liu |
| collection | DOAJ |
| description | Degradation mechanism of methyl orange (MO), a typical azo dye, with pyrite (FeS2) activated persulfate (PS) was explored. The results showed that when the initial concentration of MO was 0.1 mM, FeS2 was 1.6 g/L and PS was 1.0 mM, the removal rate of MO could reach 92.9% in 150 min, and the removal rate of total organic carbon could reach 14.1%. In addition, both pH ≤ 2 and pH ≥ 10 could have an inhibitory effect in the FeS2/PS system. Furthermore, Cl− and low concentrations of had little effect on the degradation of MO with FeS2/PS. However, and high concentrations of could inhibit the degradation of MO in the system. Besides, MO in river water and tap water were not degraded in FeS2/PS system, but acidification (pH = 4) would greatly promote the degradation. In addition, the removal rate of MO with FeS2/PS could still reach about 90% after five cycles of FeS2. Furthermore, the intermediates and possible degradation pathways were speculated by LC-MS, and the degradation mechanism of MO by FeS2/PS was that the cycle of Fe(III)/Fe(II) could continuously activate persulfate to produce . The results could provide technical support for azo dye degradation in the FeS2/PS system. HIGHLIGHTS
FeS2/PS system could effectively remove methyl orange.;
Acification (pH = 4) could promote the degradation of methyl orange in river water by a FeS2/PS system.;
FeS2 could be recycled for activation of PS.; |
| first_indexed | 2024-04-12T07:41:30Z |
| format | Article |
| id | doaj.art-d85ae2fd447d4c1190daae46bbadacf6 |
| institution | Directory Open Access Journal |
| issn | 0273-1223 1996-9732 |
| language | English |
| last_indexed | 2024-04-12T07:41:30Z |
| publishDate | 2022-05-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Science and Technology |
| spelling | doaj.art-d85ae2fd447d4c1190daae46bbadacf62022-12-22T03:41:48ZengIWA PublishingWater Science and Technology0273-12231996-97322022-05-0185102912292710.2166/wst.2022.134134Degradation of methyl orange by pyrite activated persulfate oxidation: mechanism, pathway and influences of water substratesHui Liu0Fenwu Liu1Jian Zhang2Jiaxing Zhou3Wenlong Bi4Junmei Qin5Qingjie Hou6Yue Ni7Shaozu Xu8Chen Yang9 College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, PR China College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, PR China College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, PR China College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, PR China College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, PR China College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, PR China College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, PR China College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, PR China College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, PR China College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, PR China Degradation mechanism of methyl orange (MO), a typical azo dye, with pyrite (FeS2) activated persulfate (PS) was explored. The results showed that when the initial concentration of MO was 0.1 mM, FeS2 was 1.6 g/L and PS was 1.0 mM, the removal rate of MO could reach 92.9% in 150 min, and the removal rate of total organic carbon could reach 14.1%. In addition, both pH ≤ 2 and pH ≥ 10 could have an inhibitory effect in the FeS2/PS system. Furthermore, Cl− and low concentrations of had little effect on the degradation of MO with FeS2/PS. However, and high concentrations of could inhibit the degradation of MO in the system. Besides, MO in river water and tap water were not degraded in FeS2/PS system, but acidification (pH = 4) would greatly promote the degradation. In addition, the removal rate of MO with FeS2/PS could still reach about 90% after five cycles of FeS2. Furthermore, the intermediates and possible degradation pathways were speculated by LC-MS, and the degradation mechanism of MO by FeS2/PS was that the cycle of Fe(III)/Fe(II) could continuously activate persulfate to produce . The results could provide technical support for azo dye degradation in the FeS2/PS system. HIGHLIGHTS FeS2/PS system could effectively remove methyl orange.; Acification (pH = 4) could promote the degradation of methyl orange in river water by a FeS2/PS system.; FeS2 could be recycled for activation of PS.;http://wst.iwaponline.com/content/85/10/2912advanced oxidation processesmethyl orangepersulfatepyrite |
| spellingShingle | Hui Liu Fenwu Liu Jian Zhang Jiaxing Zhou Wenlong Bi Junmei Qin Qingjie Hou Yue Ni Shaozu Xu Chen Yang Degradation of methyl orange by pyrite activated persulfate oxidation: mechanism, pathway and influences of water substrates Water Science and Technology advanced oxidation processes methyl orange persulfate pyrite |
| title | Degradation of methyl orange by pyrite activated persulfate oxidation: mechanism, pathway and influences of water substrates |
| title_full | Degradation of methyl orange by pyrite activated persulfate oxidation: mechanism, pathway and influences of water substrates |
| title_fullStr | Degradation of methyl orange by pyrite activated persulfate oxidation: mechanism, pathway and influences of water substrates |
| title_full_unstemmed | Degradation of methyl orange by pyrite activated persulfate oxidation: mechanism, pathway and influences of water substrates |
| title_short | Degradation of methyl orange by pyrite activated persulfate oxidation: mechanism, pathway and influences of water substrates |
| title_sort | degradation of methyl orange by pyrite activated persulfate oxidation mechanism pathway and influences of water substrates |
| topic | advanced oxidation processes methyl orange persulfate pyrite |
| url | http://wst.iwaponline.com/content/85/10/2912 |
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