纳米ZrOx光催化剂的制备及性能

采用表面活性剂辅助水热法制备了高效微波辅助光催化水处理纳米ZrOx光催化剂．以XPS、XRD和UV—vis技术对催化剂进行了表征：纳米ZrOx具有单斜和四方两种晶型，晶粒尺寸约为8nm；纳米ZrOx中Zr元素以＋2、＋3、＋4三种价态共存于晶体中，多价态共存的状态使纳米ZrOx对微波具有更好的响应，纳米ZrOx具有比P25TiO2更大的禁带宽度，即紫外光照射纳米ZrOx产生的光生电子—空穴具有更强的氧化还原能力．以双酚A为目标物对样品的微波辅助光催化性能进行评价，结果表明，纳米ZrOx具有远高于P25TiO2的微波辅助光催化性能，而且纳米ZrOx光催化与微波场具有更好的协同效应．

Preparation and Performance of Nano-ZrOx Photocatalyst

Nano-ZrOx catalyst has been fabricated by a surfactant assisted hydrothermal method.XPS,XRD and UV-vis techniques are adopted for the characterization of the as-prepared nano-ZrOx.Monoclinic and tetragonal phases both exist in the crystal of the catalyst,and the crystallite size is ca.8 nm.Based on the fitting results of the XPS spectrum of Zr3d,three valences(+2,+3,+4)are found to coexist in the crystal of the as-prepared catalyst,and it can be concluded that the mixed-valences in the nano-ZrOx catalyst contribute to higher microwave-response efficiency.Meanwhile,the nano-ZrOx catalyst owns a much wider band gap than that of P25 TiO2,which means the photogenerated electrons-holes on the nano-ZrOx catalyst have much stronger redox ability than those of P25 TiO2.Bisphenol A is used as model compound to test the microwave-assisted photocatalytic activity of the as-prepared ZrOx.Results show that the nano-ZrOx catalyst has much more significant microwave-assisted photocatalytic activity than that of P25 TiO2.Moreover,nano-ZrOx photocatalysis has much stronger synergistic effect with microwave irradiation.