黄铁矿的光催化及其辉光放电等离子体催化降解水体中泰乐霉素的性能对比  

Comparison on the performance of tylosin tartrate degradation by photocatalysis and glow discharge plasma catalysis of pyrite

作　　者：周进文 马伟师 李炀 舒小华[2] 张倩[1] ZHOU Jinwen;MA Weishi;LI Yang;SHU Xiaohua;ZHANG Qian(School of Life and Environmental Science,Guilin University of Electronic Technology,Guilin,Guangxi 541000,China;College of Environmental Science and Engineering,Guilin University of Technology,Guilin,Guangxi 541000,China)

机构地区：[1]桂林电子科技大学生命与环境科学学院,桂林541004 [2]桂林理工大学环境科学与工程学院,桂林541006

出　　处：《环境工程学报》2022年第10期3192-3203,共12页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(41967042);广西创新研究团队资助项目(2018GXNSFGA281001)。

摘　　要：黄铁矿的异相Fenton和半导体特性使其具有良好的污染物降解潜力。基于黄铁矿的光催化技术和辉光放电等离子体技术可以同时利用这2种特性。但目前仍缺乏对这2种技术降解抗生素废水的对比研究。因此,考察了黄铁矿参与的2种高级氧化技术(AOP)对泰乐霉素(tylosin tartrate,TYL)的降解效果、机制、产物、适用条件和经济成本。结果表明,2种技术在pH=3~11内对TYL均有稳定的降解性能。黄铁矿光催化技术对TYL的降解效率(99%)要明显高于黄铁矿耦合等离子技术(56.33%),但其矿化效果却低于等离子技术。2种反应体系中的·OH、h^(+)·O_(2)^(−)以及e^(−)均参与到TYL的降解中。其中,在黄铁矿光催化体系中·OH、h+和·O_(2)^(−)是TYL降解的主要活性物种。活性物种主要通过光催化与Fenton反应生成。而在黄铁矿耦合等离子体体系中,e^(−)在TYL降解中发挥的作用则更为突出。与黄铁矿光催化相比,黄铁矿耦合等离子体中e^(−*)的产生为TYL的降解提供了更多的活性物种。2种催化降解技术对TYL的降解过程相似。TYL经过水解、C-O键断裂、去羟基、去甲基、C=O、C-N断裂、开环后最终被矿化为H_(2)O和CO_(2)。在相同实验条件下,黄铁矿耦合等离子体技术对TYL的处理效能要优于光催化技术。以上研究结果有助于更好地理解黄铁矿参与的高级氧化技术对污染物的降解机理,并为难降解的抗生素类污染物的处理提供参考。Pyrite shows an excellent contamination degrading ability due to its heterogeneous Fenton and semiconductor properties,which could be used by pyrite-based photocatalysis and glow discharge plasma technology.However,a comprehensive comparison of these two technologies for the degradation of antibiotic wastewater is still limited.Therefore,two kinds of advanced oxidation techniques(AOPs)based on pyrite were studied to investigate the efficiency,mechanisms,products,application conditions and economic costs of tylosin tartrate(TYL)degradation.The results showed that both techniques exhibited a stable TYL degradation performance within pH 3~11.Pyrite-based photocatalysis had a significantly higher degradation efficiency for TYL(99%)than pyrite-based plasma technology(56.33%),but the mineralization efficiency of the former was lower than that of the latter.The·OH,h^(+),·O_(2)^(−)as well as e^(−)in both reaction systems took part in the degradation of TYL.Yet·OH,h+and·O_(2)^(−)were the main active species in the pyrite photocatalytic system for TYL degradation.Of which,in pyrite-based photocatalysis system,·OH、h^(+) and·O_(2)^(−)were the active species for TYL degradation,they were mainly produced through photocatalytic and Fenton reactions.In the pyrite-based plasma system,e^(−)played a more prominent role in the degradation of TYL.The production of e^(−*) in the pyrite-based plasma system provided more active species for the degradation of TYL than in photocatalysis.The degradation process of TYL was similar in the two catalytic degradation techniques.TYL was mineralized to H_(2)O and CO_(2) lastly through hydrolysis,breakage of C-O bond,de-hydroxylation,de-methylation,breakage of C=O,C-N and ring opening.Under the same experimental conditions,the pyrite-based plasma technique was more effective than photocatalysis for the degradation of TYL.The results of this study contribute to a better understanding of the processes and mechanisms involved in the degradation of pollutants by advanced oxidation

关 键 词：黄铁矿 泰乐霉素 光催化技术 等离子体 

分 类 号：X703.1[环境科学与工程—环境工程]