新型Z型TiO_(2)/Ag/Ag_(3)PO_(4)光催化剂的设计及其降解环丙沙星性能研究

Design of direct Z-type TiO_(2)/Ag/Ag_(3)PO_(4) photocatalyst and its degradation performance of ciprofloxaci

采用光沉积-液相化学法调节电子流向,构建了直接Z型TiO_(2)/Ag/Ag_(3)PO_(4)(TAAPO)光催化材料.通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱仪以及光致发光(PL)光谱仪等手段对其进行表征,并对其在可见光照射下催化降解环丙沙星(CIP)的性能进行了研究.结果表明,当水体pH为3.0,催化剂分散浓度为0.3g/L,CIP的初始浓度为15mg/L时,光催化降解体系能够取得最佳的去除效果.在该组条件下,光照120min CIP的降解率约为99%,并且在经历4个循环后仍然保持了良好的降解效果.在光催化降解CIP的过程中,主要反应活性物种为超氧自由基(·O_(2)^(-)).

Direct Z-type TiO_(2)/Ag/Ag_(3)PO_(4)(TAAPO)photocatalytic materials were constructed by adjusting the electron flow by photodeposition-liquid phase chemistry.The physicochemical properties of TAAPO were characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),Xray diffractometer(XRD),X-ray photoelectron spectroscopy(XPS),UV-Vis diffuse reflectance spectrometer and photoluminescence(PL)spectrometer and their performance was investigated for the catalytic degradation of ciprofloxacin(CIP)under visible light irradiation.The results show that the photocatalytic degradation system can achieve the best removal effect when the pH value of water,the dispersion concentration of catalyst and the initial concentration of CIP is 3.0,0.3g/L and 15mg/L,respectively.Under this set of conditions,the removal rate of CIP was about 99%under light for 120min,and it still maintained a good degradation effect after four cycles.In the process of photocatalytic degradation of CIP,the main reactive species are superoxide radicals.