铁酸铋催化类芬顿及光芬顿体系降解诺氟沙星
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摘要
通过水热法制备铁酸铋催化剂,采用XRD、SEM等方法对样品进行表征,并以类芬顿体系和光芬顿体系分别降解诺氟沙星,考察相关反应参数对诺氟沙星降解效果的影响。试验结果表明,类芬顿体系降解诺氟沙星过程符合伪一级反应动力学模型,在诺氟沙星初始浓度为10mg/L、pH值为3、H_2O_2投加量为1 mmol/L、铁酸铋催化剂投加量为1. 0 g/L、反应时间为2 h条件下,体系对诺氟沙星的降解率达到100%,表观速率常数K_(app)为0. 018 7 min~(-1)。比较铁酸铋催化类芬顿及光芬顿体系分别降解诺氟沙星的效果,发现光照对类芬顿体系降解诺氟沙星具有显著的促进作用,且能够扩宽体系pH值的适用范围。重复使用性试验和相关检测结果表明,制备的铁酸铋催化剂性质稳定,无金属离子溶出,具有较好的重复使用性。
BiFeO_3 was prepared through hydrothermal method,and its sample was characterized by XRD and SEM. BiFeO_3/Fenton-like and BiFeO_3/photo-Fenton systems were used to degrade norfloxacin,and the effect of reaction conditions on the degradation of norfloxacin was investigated. The results indicated that the degradation of norfloxacin followed the pseudo-first order reaction kinetics model. The degradation rate of norfloxacin was 100% and the apparent rate constant Kappwas 0. 018 7 min~(-1) with norfloxacin initial concentration of 10 mg/L,H_2O_2 dosage of 1 mmol/L,p H value of 3,BiFeO_3 dosage of 1. 0 g/L and reaction time of 2 hours. It was found that the addition of light could significantly improve the degradation of norfloxacin and widened the applicable range of pH value of the system after comparing the norfloxacin degradation effect by BiFeO_3/Fenton-like and BiFeO_3/photoFenton systems. The reusability test and related test results showed that the BiFeO_3 catalyst had stable properties with good reusability,and there was no metal ion dissolution.
BiFeO_3 was prepared through hydrothermal method,and its sample was characterized by XRD and SEM. BiFeO_3/Fenton-like and BiFeO_3/photo-Fenton systems were used to degrade norfloxacin,and the effect of reaction conditions on the degradation of norfloxacin was investigated. The results indicated that the degradation of norfloxacin followed the pseudo-first order reaction kinetics model. The degradation rate of norfloxacin was 100% and the apparent rate constant Kappwas 0. 018 7 min~(-1) with norfloxacin initial concentration of 10 mg/L,H_2O_2 dosage of 1 mmol/L,p H value of 3,BiFeO_3 dosage of 1. 0 g/L and reaction time of 2 hours. It was found that the addition of light could significantly improve the degradation of norfloxacin and widened the applicable range of pH value of the system after comparing the norfloxacin degradation effect by BiFeO_3/Fenton-like and BiFeO_3/photoFenton systems. The reusability test and related test results showed that the BiFeO_3 catalyst had stable properties with good reusability,and there was no metal ion dissolution.
引文
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[3]Allen H K,Donato J,Wang H H,et al.Call of the wild:antibiotic resistance genes in natural environments[J].Nat Rev Microbiol,2010,8(4):251-259.
[4]Ferber D.From pigs to people:the emergence of a new superbug[J].Science,2010,329(5995):1010-1011.
[5]Li B,Zhang T.Biodegradation and adsorption of antibiotics in the activated sludge process[J].Environ Sci Technol,2010,44(9):3468-3473.
[6]Koyuncu I,Arikan O A,Wiesner M R,et al.Removal of hormones and antibiotics by nanofiltration membranes[J].J Membr Sci,2008,309(1/2):94-101.
[7]Alexy R,Kümpel T,Kümmerer K.Assessment of degradation of 18 antibiotics in the Closed Bottle Test[J].Chemosphere,2004,57(6):505-512.
[8]Haque M M,Muneer M.Photodegradation of norfloxacin in aqueous suspensions of titanium dioxide[J].J Hazard Mater,2007,145(1/2):51-57.
[9]江传锐,虢清伟,卓琼芳,等.纳米铁酸盐光催化剂的制备及其在废水处理中的应用综述[J].化工环保,2015,35(1):27-33.Jiang Chuanrui,Guo Qingwei,Zhuo Qiongfang,et al.Review on preparation of nano ferrite photocatalyst and its application in wastewater treatment[J].Environmental Protection of Chemical Industry,2015,35(1):27-33(in Chinese).
[10]何剑.纳米结构Bi Fe O3光催化降解有机污染物及其光电化学性能研究[D].苏州:苏州大学,2013.He Jian.The Photocatalytic Degradation of Organic Pollutant and Photoelectrochemical Properites of Nanoscale Bi Fe O3[D].Suzhou:Soochow University,2013(in Chinese).
[11]Rusevova K,K9ferstein R,Rosell M,et al.La Fe O3and Bi Fe O3perovskites as nanocatalysts for contaminant degradation in heterogeneous Fenton-like reactions[J].Chem Eng J,2014,239:322-331.
[12]Duesterberg C K,Mylon S E,Waite T D.p H effects on iron-catalyzed oxidation using Fenton’s reagent[J].Environmental Science&Technology,2008,42(22):8522-8527.
[13]闫巍,余智勇,田江南,等.Fe3O4-膨润土作为电Fenton催化剂用于降解橙黄G[J].工业水处理,2018,38(2):40-43.Yan Wei,Yu Zhiyong,Tian Jiangnan,et al.Research on Fe3O4-bentonite used as electric Fenton catalyst applied to the degradation of orange G[J].Industrial Water Treatment,2008,38(2):40-43(in Chinese).
[14]孟宁,欧晓霞,秦雷云,等.芬顿氧化法降解水溶液中甲基橙的研究[J].绿色科技,2018(8):61-63.Meng Ning,Ou Xiaoxia,Qin Leiyun,et al.Oxidation of methyl orange in aqueous solution by Fenton[J].Journal of Green Science and Technology,2018(8):61-63(in Chinese).
[15]高樱,刘金涛,王宇晶,等.改性光催化剂的制备与表征及其在光芬顿中的应用[J].西安工业大学学报,2018,38(3):250-256.Gao Ying,Liu Jintao,Wang Yujing,et al.Modified photocatalyst:Preparation,characterization and applications in UV-Fenton[J].Journal of Xi’an Technology University,2018,38(3):250-256(in Chinese).
[16]Soltani T,Entezari M H.Photolysis and photocatalysis of methylene blue by ferrite bismuth nanoparticles under sunlight irradiation[J].Journal of Molecular Catalysis A:Chemical,2013,377:197-203.
[17]Cai C,Zhang Z Y,Liu J,et al.Visible light-assisted heterogeneous Fenton with Zn Fe2O4for the degradation of OrangeⅡin water[J].Applied Catalysis B:Environmental,2016,182:456-468.
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