Photodegradation and antibacterial properties of zeolite cerium oxide nanocomposite

K. Rakesh, M. Vyshnavi, R. Antony
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引用次数: 5

Abstract

Zeolite cerium oxide (ZEC) nanocomposite was prepared by co-precipitation method and was characterized by X-ray diffraction (XRD) and Fourier transforms infrareds Spectroscopy (FTIR). The XRD analysis confirmed the formation of nanocomposite of fluorite structured CeO2 having diameter 25 nm embedded in zeolite matrix. The FTIR spectrum of composite showed metal-oxygen bonds near 400 cm−1. ZEC composite was used as photo-catalyst for the degradation of Malachite Green dye (MG) under sun light. The influence of parameters like initial dye concentration, catalyst dose, pH and time on degradation of dye was monitored. 100% photo degradation efficiency was obtained using MG solution of concentration 60 ppm, 100 mg of ZEC catalyst at pH 10.0 in a time period of 15minutes. The mechanism of dye degradation was found to follow pseudo first order kinetics. The antibacterial activity of ZEC was tested against Bacillus subtilis (B29) and Escherichia coli (E266) bacteria using disc diffusion method. After 24 hrs of bacterial growth, the ZEC composite showed excellent antibacterial activity with inhibition zones of 21 mm and 23 mm against Bacillus subtilis and Escherichia coli respectively.Zeolite cerium oxide (ZEC) nanocomposite was prepared by co-precipitation method and was characterized by X-ray diffraction (XRD) and Fourier transforms infrareds Spectroscopy (FTIR). The XRD analysis confirmed the formation of nanocomposite of fluorite structured CeO2 having diameter 25 nm embedded in zeolite matrix. The FTIR spectrum of composite showed metal-oxygen bonds near 400 cm−1. ZEC composite was used as photo-catalyst for the degradation of Malachite Green dye (MG) under sun light. The influence of parameters like initial dye concentration, catalyst dose, pH and time on degradation of dye was monitored. 100% photo degradation efficiency was obtained using MG solution of concentration 60 ppm, 100 mg of ZEC catalyst at pH 10.0 in a time period of 15minutes. The mechanism of dye degradation was found to follow pseudo first order kinetics. The antibacterial activity of ZEC was tested against Bacillus subtilis (B29) and Escherichia coli (E266) bacteria using disc diffusion method. After 24 hrs of ba...
沸石氧化铈纳米复合材料的光降解及抗菌性能
采用共沉淀法制备了沸石氧化铈(ZEC)纳米复合材料,并用x射线衍射(XRD)和傅里叶变换红外光谱(FTIR)对其进行了表征。XRD分析证实在沸石基体中包埋形成了直径为25 nm的萤石结构CeO2纳米复合材料。复合材料的FTIR光谱在400 cm−1附近显示金属-氧键。以ZEC复合材料为光催化剂,在日光下降解孔雀石绿染料(MG)。考察了初始染料浓度、催化剂用量、pH、时间等参数对染料降解的影响。MG溶液浓度为60 ppm, ZEC催化剂为100 MG, pH为10.0,时间为15min,光降解效率为100%。发现染料降解机理符合准一级动力学。采用圆盘扩散法测定ZEC对枯草芽孢杆菌(B29)和大肠杆菌(E266)的抑菌活性。细菌生长24 h后,ZEC复合材料对枯草芽孢杆菌和大肠杆菌的抑制区分别为21 mm和23 mm,表现出良好的抑菌活性。采用共沉淀法制备了沸石氧化铈(ZEC)纳米复合材料,并用x射线衍射(XRD)和傅里叶变换红外光谱(FTIR)对其进行了表征。XRD分析证实在沸石基体中包埋形成了直径为25 nm的萤石结构CeO2纳米复合材料。复合材料的FTIR光谱在400 cm−1附近显示金属-氧键。以ZEC复合材料为光催化剂,在日光下降解孔雀石绿染料(MG)。考察了初始染料浓度、催化剂用量、pH、时间等参数对染料降解的影响。MG溶液浓度为60 ppm, ZEC催化剂为100 MG, pH为10.0,时间为15min,光降解效率为100%。发现染料降解机理符合准一级动力学。采用圆盘扩散法测定ZEC对枯草芽孢杆菌(B29)和大肠杆菌(E266)的抑菌活性。24小时后…
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