锰改性含钛高炉渣光催化剂降解废水中的Cr6+

摘要

In order to realize the targets of using waste into treatment of waste and turning the waste into treasure,using Ti-bearing blast furnace slag as material and MnO2 as the modifier through high temperature solid phase method produced TiO2 pho-tocatalyst. Through XRD,UV-Vis diffuse analyzed its characterization,Influence of factors such as pH of the simulated waste wa-ter,addition amount of photocatalyst,and illumination time on degradation rate of Cr6+ by TiO2 photocatalyst. Results indicated that anatase phase TiO2 produced through calcination at 800 ℃ for 2 h of Ti-bearing blast furnace slag photocatalyst has better photo response effect to ultraviolet region. The degradation rate of Cr6+ reached to 89. 17%, when simulated effluent pH was 1. 62,photocatalyst additive amount was 0. 40 g/L,illumination time was 60 min.%为了实现以废治废、变废为宝的目标,以攀钢含钛高炉渣为原料、MnO2为改性剂,采用高温固相法制备了改性的TiO2光催化剂.通过XRD、UV-Vis吸收光谱等对其进行表征,研究了模拟废液pH、催化剂用量和光照时间等因素对改性的TiO2光催化剂降解Cr6+的影响.结果表明:800℃下煅烧2 h所得的含钛高炉渣光催化材料中出现的锐钛矿型TiO2对紫外区域有较好的光响应.在溶液pH=1.62,光催化剂用量为0.40 g/L,光照时间为60 min情况下,Cr6+浓度为10 mg/L的模拟废水中Cr6+的降解率为89.17%.