单层Ti_(3)C_(2)T_(x)/ZnO复合光催化剂的制备及对盐酸四环素的降解应用

Preparation of monolayer Ti_(3)C_(2)T_(x)/ZnO composite photocatalyst and its application in the degradation of tetracycline hydrochloride

采用二甲基亚砜(DMSO)插层法制备单层Ti_(3)C_(2)T_(x),并用共沉淀法合成了高催化活性的Ti_(3)C_(2)T_(x)/ZnO复合光催化剂。通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和紫外-可见漫反射光谱(UV-Vis DRS)等手段进行表征。结果表明:ZnO与Ti_(3)C_(2)T_(x)复合后,其光催化性能得到了明显提升,当Ti_(3)C_(2)T_(x)与ZnO复合比例为16%时,其具有最佳的降解效果,在可见光照射2h下对盐酸四环素(TCH)降解率可达91.36%。光催化活性的提高主要由于Ti_(3)C_(2)T_(x)与ZnO表面形成的肖特基势垒有效地抑制了电子空穴的复合,提高了光催化效率。

This study used dimethyl sulfoxide(DMSO)intercalation method to prepare monolayer Ti_(3)C_(2)T_(x),and then high catalytic Ti_(3)C_(2)T_(x)/ZnO composite photocatalyst was synthesized by co-precipitation method.The composite was characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),and UV-Vis DRS.The results showed that the photocatalytic performance of ZnO composite with Ti_(3)C_(2)T_(x) was significantly improved.When the composite ratio of Ti_(3)C_(2)T_(x) to ZnO was 16%,it had the best degradation effect,with a degradation rate of 91.36%for tetracycline hydrochloride(TCH)under visible light irradiation for 2h.The improvement of photocatalytic activity was mainly due to the Schottky barrier formed on the surface of Ti_(3)C_(2)T_(x) and ZnO,which effectively inhibited the recombination of electron-hole pairs and improved photocatalytic efficiency.