1.贵州民族大学生态环境工程学院，贵阳 550025
基金项目: 国家自然科学基金资助项目21667011
贵州省科技厅与贵州民族大学联合基金项目黔科合LH字[2015]7225国家自然科学基金资助项目(21667011)
贵州省科技厅与贵州民族大学联合基金项目(黔科合LH字[2015]7225)
Tetracycline degradation under UVA irradiation in nitrate system
WANG Yajie1,1.School of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
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摘要:为了考察紫外光照射下四环素(tetracycline，TC)在硝酸盐(NO3-)体系中的降解过程，研究了初始pH、TC初始浓度、NO3-浓度、腐殖酸以及磷酸盐等环境因子对TC光降解的影响，利用ESR检测和自由基猝灭实验，量化分析体系中不同氧化途径对TC去除的贡献率。结果表明：TC在NO3-体系中的光降解受pH影响显著；腐殖酸和磷酸盐对TC的降解表现出不同程度的抑制作用；TC通过直接光解、HO·、1O2和O2?-氧化4种途径降解，当TC浓度为10.0 mg·L-1，NO3-浓度为1.0 mmol·L-1，pH 为7.0时光照150 min后，不同途径的贡献率分别为60.4%、25.6%、8.9%和5.1%。结果有助于了解TC的环境化学行为，为TC治理提供参考。
关键词: 抗生素污染/
四环素降解/
硝酸盐体系/
光降解/
活性氧化物种
Abstract:In order to investigate tetracycline (TC) degradation in nitrate system under the UVA-irradiation, the influences of initial pH, initial TC concentration, nitrate concentration, humic acid dosage and phosphate concentration on TC photodegradation process were studied. The contribution efficiencies of different oxidative pathways to TC removal were also quantified by using the electron spin resonance (ESR) detection and radical-quenching experiments. Results showed that the photodegradation of TC in nitrate solution was strongly affected by pH, humic acid and phosphate showed different degrees of inhibition against this process. The four pathways for TC degradation were identified as the direct photolysis, HO·, 1O2 and O2?-oxidations. After 150 min irradiation treatment of 10.0 mg·L-1 TC in 1.0 mmol·L-1 nitrate system at pH 7.0, the contribution efficiencies of direct photolysis, HO· oxidation, 1O2 oxidation and O2?- oxidation were 60.4%, 25.6%, 8.9% and 5.1%, respectively. Results can help to gain insight into the environmental behavior of TC and offer reference to TC-contamination treatment.
Key words:antibiotic contamination/
tetracycline degradation/
nitrate system/
photodegradation/
reactive oxygen species (ROS).
| [1] | KHETAN S K, COLLINS T J. Human pharmaceuticals in the aquatic environment: A challenge to green chemistry[J]. Chemical Reviews, 2007, 107(6): 2319-2364. |
| [2] | CHRISTIAN T, SCHNEIDER R, FARBER H A, et al. Determination of antibiotic residues in manure, soil, and surface waters[J]. Acta Hydrochimica et Hydrobiologica, 2003, 31(1): 36-44. |
| [3] | MACK J, BOLTON J R. Photochemistry of nitrite and nitrate in aqueous solution: A review[J]. Journal of Photochemistry and Photobiology A: Chemistry, 1999, 128(1/2/3): 1-13. |
| [4] | NIU J F, LI Y, WANG W L. Light-source-dependent role of nitrate and humic acid in tetracycline photolysis: Kinetics and mechanism[J]. Chemosphere, 2013, 92(11): 1423-1429. |
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| [9] | CHEN Y, ZHANG K, ZUO Y G. Direct and indirect photodegradation of estriol in the presence of humic acid, nitrate and iron complexes in water solutions[J]. Science of the Total Environment, 2013, 463-464: 802-809. |
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| [11] | 白泽琳，何伟，李一龙，等.光诱导腐殖酸产生单线态氧的影响因素研究[J]. 环境科学学报, 2016, 36(4): 1169-1175. |
| [12] | LI S, HU J. Photolytic and photocatalytic degradation of tetracycline: Effect of humic acid on degradation kinetics and mechanisms[J]. Journal of Hazardous Materials, 2016, 318: 134-144. |
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刊出日期:2019-06-18
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紫外光降解硝酸盐体系中四环素
王雅洁1,1.贵州民族大学生态环境工程学院，贵阳 550025
基金项目: 国家自然科学基金资助项目21667011 贵州省科技厅与贵州民族大学联合基金项目黔科合LH字[2015]7225国家自然科学基金资助项目(21667011) 贵州省科技厅与贵州民族大学联合基金项目(黔科合LH字[2015]7225)
关键词: 抗生素污染/
四环素降解/
硝酸盐体系/
光降解/
活性氧化物种
摘要:为了考察紫外光照射下四环素(tetracycline，TC)在硝酸盐(NO3-)体系中的降解过程，研究了初始pH、TC初始浓度、NO3-浓度、腐殖酸以及磷酸盐等环境因子对TC光降解的影响，利用ESR检测和自由基猝灭实验，量化分析体系中不同氧化途径对TC去除的贡献率。结果表明：TC在NO3-体系中的光降解受pH影响显著；腐殖酸和磷酸盐对TC的降解表现出不同程度的抑制作用；TC通过直接光解、HO·、1O2和O2?-氧化4种途径降解，当TC浓度为10.0 mg·L-1，NO3-浓度为1.0 mmol·L-1，pH 为7.0时光照150 min后，不同途径的贡献率分别为60.4%、25.6%、8.9%和5.1%。结果有助于了解TC的环境化学行为，为TC治理提供参考。
English Abstract
Tetracycline degradation under UVA irradiation in nitrate system
WANG Yajie1,1.School of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China
Keywords: antibiotic contamination/
tetracycline degradation/
nitrate system/
photodegradation/
reactive oxygen species (ROS)
Abstract:In order to investigate tetracycline (TC) degradation in nitrate system under the UVA-irradiation, the influences of initial pH, initial TC concentration, nitrate concentration, humic acid dosage and phosphate concentration on TC photodegradation process were studied. The contribution efficiencies of different oxidative pathways to TC removal were also quantified by using the electron spin resonance (ESR) detection and radical-quenching experiments. Results showed that the photodegradation of TC in nitrate solution was strongly affected by pH, humic acid and phosphate showed different degrees of inhibition against this process. The four pathways for TC degradation were identified as the direct photolysis, HO·, 1O2 and O2?-oxidations. After 150 min irradiation treatment of 10.0 mg·L-1 TC in 1.0 mmol·L-1 nitrate system at pH 7.0, the contribution efficiencies of direct photolysis, HO· oxidation, 1O2 oxidation and O2?- oxidation were 60.4%, 25.6%, 8.9% and 5.1%, respectively. Results can help to gain insight into the environmental behavior of TC and offer reference to TC-contamination treatment.
