Mg-M(Al,Fe)层状双氢氧化物光催化降解环丙沙星试验研究
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摘要
采用共沉淀法制备镁基层状双氢氧化物(Mg-Al-LDHs和Mg-Fe-LDHs)光催化剂,所得到的Mg-Al-LDHs (白色)和Mg-Fe-LDHs (红褐色)颜色明显不同。通过X射线衍射仪和扫描电镜对催化剂进行了表征。以光催化降解典型抗生素环丙沙星为模型反应,在模拟太阳光照射下,Mg-Al-LDHs明显比Mg-Fe-LDHs催化活性高;在可见光照射下,Mg-Al-LDHs基本没有催化活性,Mg-Fe-LDHs有一定催化活性但较低。光学性质、吸附性能和荧光光谱测试结果表明,模拟太阳光照射下,影响光催化活性的因素为吸附性能;在可见光照射下,影响光催化活性的因素是催化剂光吸收范围。
The magnesium-based layered double hydroxide(Mg-Al-LDHs and Mg-Fe-LDHs)photocatalyst is prepared by co-precipitation method.The color of the prepared product is obviously different,Mg-Al-LDHs are white and Mg-FeLDHs are reddish-brown.The catalyst is characterized by X-ray diffraction and scanning electron microscopy.The photocatalytic degradation of the typical antibiotic ciprofloxacin is used as a model reaction.Under simulated sunlight irradiation,Mg-Al-LDHs are significantly more active than Mg-Fe-LDHs.Under visible light irradiation,Mg-Al-LDHs have little catalytic activity,and Mg-Fe-LDHs have a certain catalytic activity but it is low.Through optical properties,adsorption properties and fluorescence spectrum testing,it shows that under the simulated sunlight irradiation,the factors influencing the photocatalytic activity are the adsorption performance,but under visible light irradiation,the factor influencing the photocatalytic activity is the range of light absorption of catalyst.
The magnesium-based layered double hydroxide(Mg-Al-LDHs and Mg-Fe-LDHs)photocatalyst is prepared by co-precipitation method.The color of the prepared product is obviously different,Mg-Al-LDHs are white and Mg-FeLDHs are reddish-brown.The catalyst is characterized by X-ray diffraction and scanning electron microscopy.The photocatalytic degradation of the typical antibiotic ciprofloxacin is used as a model reaction.Under simulated sunlight irradiation,Mg-Al-LDHs are significantly more active than Mg-Fe-LDHs.Under visible light irradiation,Mg-Al-LDHs have little catalytic activity,and Mg-Fe-LDHs have a certain catalytic activity but it is low.Through optical properties,adsorption properties and fluorescence spectrum testing,it shows that under the simulated sunlight irradiation,the factors influencing the photocatalytic activity are the adsorption performance,but under visible light irradiation,the factor influencing the photocatalytic activity is the range of light absorption of catalyst.
引文
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[3]Liu X,Steele J C,Meng X Z.Usage,residue,and human health risk of antibiotics in Chinese aquaculture:A review[J].Environmental Pollution,2017(233):161~169.
[4]Elmolla E S,Chaudhuri M.Degradation of amoxicillin,ampicillin and cloxacillin antibiotics in aqueous solution by the UV/ZnO photocatalytic process[J].Journal of Hazardous Materials,2017(173):445~449.
[5]Palominos R A,Mondaca M A,Giraldo A,et al.Photocatalytic oxidation of the antibiotic tetracycline on TiO2and ZnO suspensions[J].Catalysis Today,2009(144):100~105.
[6]郑惠东.水环境中抗生素来源及对健康的影响[J].环境卫生学杂志,2018,8(1):73~77.
[7]何璐红,李娜.层状双氢氧化物的制备及应用述评[J].盐业与化工,2015,44(11):1~5.
[8]Parida K M,Mohapatra K M.Carbonate intercalated Zn/Fe layered double hydroxide:A novel photocatalyst for the enhanced photo degradation of azo dyes[J].Chemical Engineering Journal,2012(179):131~139.
[9]Bouberka Z,Benabbou K A,Khenifi A,et al.Degradation by irradiation of an Acid Orange 7on colloidal TiO2/(LDHs)[J].Journal of Photochemistry and Photobiology A:Chemistry,2014(275):21~29.
[10]Valente J S,Tzompantzi F,Prince J,et al.Adsorption and photocatalytic degradation of phenol and 2,4dichlorophenoxiacetic acid by Mg-Zn-Al layered double hydroxides[J].Applied Catalysis B:Environmental,2009,90(3-4):330~338.
[11]Sun J C,Zhang Y B,Cheng J,et al.Synthesis of Ag/AgCl/Zn-Cr LDHs composite with enhanced visible-light photocatalytic performance[J].Journal of Molecular Catalysis A:Chemical,2014(382):146~153.
[12]Tzompantzi F,Mendoza-Damián G,Rico J L,et al.Enhanced photoactivity for the phenol mineralization on ZnAlLa mixed oxides prepared from calcined LDHs[J].Catalysis Today,2014(220-222):56~60.
[13]Zhao Y F,Zhao Y X,Waterhouse G I N,et al.Layered-double-hydroxide nanosheets as efficient visible-light-driven photocatalysts for dinitrogen fixation[J].Advanced Materials,2017,1703828.
[14]Baliarsingh N,Parida K M,Pradhan G C.Effects of Co,Ni,Cu,and Zn on photophysical and photocatalytic properties of carbonate intercalated MⅡ/Cr LDHs for Enhanced Photodegradation of Methyl Orange[J].Industrial&Engineering Chemistry Research,2014,53(10):3834~3841.
[15]Xia S J,Liu F X,Ni Z M,et al.Layered double hydroxides as efficient photocatalysts for visible-light degradation of Rhodamine B[J].Journal of Colloid and Interface Science,2013(405):195~200.
[16]Fan K,Chen H,Ji Y F,et al.Nickel-vanadium monolayer double hydroxide for efficient electrochemical water oxidation[J].Nature communications,2016,11981.
[17]Mohapatra L,Parida K M.Zn-Cr layered double hydroxide:Visible light responsive photocatalyst for photocatalytic degradation of organic pollutants[J].Separation and Purification Technology,2012,91(19):73~80.