Photocatalytic activity of ZnO doped with Ag on the degradation of endocrine disrupting under UV irradiation and the investigation of its antibacterial activity
Photocatalytic activity of ZnO doped with Ag on the degradation of endocrine disrupting under UV irradiation and the investigation of its antibacterial activity
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DOI：
10.1016/j.apsusc.2015.03.049
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发表时间：
2015-08-30
影响因子：
6.7
通讯作者：
Sayadi, Sami
中科院分区：
文献类型：
--
作者：
Bechambi, Olfa;Chalbi, Manel;Sayadi, Sami
采用水热法制备了不同银摩尔含量（0.0、0.5、1.0、2.0和4.0%）的掺银ZnO光催化剂。利用x射线衍射（XRD）、77K下氮物理吸附、傅里叶变换红外光谱（FTIR）、紫外-可见光谱、光致发光光谱（PL）和拉曼光谱对样品的结构、织构和光学性质进行了表征。结果表明，当Ag含量较低（1.0%）时，Ag掺杂对晶粒的平均晶粒尺寸没有影响。比表面积（SBET）随Ag含量的增加而增加。ZnO的带隙值随着Ag掺杂水平的增加而减小。在紫外光照射和过氧化氢（H2O2）存在下光催化降解水溶液中的双酚A （BPA）和壬基酚（NP）的结果表明，银离子的掺杂大大提高了ZnO的光催化效率。1% ag掺杂ZnO的TOC转化率BPA和NP分别为72.1%和81.08%。光催化活性的增强是由于用适量的Ag修饰ZnO可以提高ZnO中光生电子空穴的分离效率。以大肠杆菌为模型对革兰氏阴性菌进行了抑菌活性研究，证实了ag掺杂ZnO比纯ZnO具有更强的抑菌活性。(C) 2015 Elsevier B.V.版权所有
Ag-doped ZnO photocatalysts with different Ag molar content (0.0, 0.5, 1.0, 2.0 and 4.0%) were prepared via hydrothermal method. The X-ray diffraction (XRD), Nitrogen physisorption at 77K, Fourier transformed infrared spectroscopy (FTIR), UV--Visible spectroscopy, Photoluminescence spectra (PL) and Raman spectroscopy were used to characterize the structural, textural and optical properties of the samples. The results showed that Ag-doping does not change the average crystallite size with the Ag low content (1.0%). The specific surface area (SBET) increases with the increase of the Ag content. The band gap values of ZnO are decreased with the increase of the Ag doping level. The results of the photocatalytic degradation of bisphenol A (BPA) and nonylphenol (NP) in aqueous solutions under UV irradiation and in the presence of hydrogen peroxide (H2O2) showed that silver ions doping greatly improved the photocatalytic efficiency of ZnO. The TOC conversion BPA and NP are 72.1% and 81.08% respectively obtained using 1% Ag-doped ZnO. The enhancement of photocatalytic activity is ascribed to the fact that the modification of ZnO with an appropriate amount of Ag can increase the separation efficiency of the photogenerated electrons-holes in ZnO. The antibacterial activity of the catalysts which uses Escherichia coli as a model for Gram-negative bacteria confirmed that Ag-doped ZnO possessed more antibacterial activity than the pure ZnO. (C) 2015 Elsevier B.V. All rights reserved.