钛酸铋光催化降解水中酸性大红的研究

Treatment of Acid Bright Red Dye Wastewater by Bismuth Titanate Photocatalyt

采用异丙醇助水热法制备了钛酸铋光催化剂,UV-vis漫反射测试表明其光吸收带较TiO2发生了红移,通过多点BET法计算出其比表面积为14.16m2/g,平均孔径为21.05nm。以酸性大红为模拟污染物,在三相内循环流化床光催化反应器中进行光催化反应,研究了废水的pH值以及钛酸铋投加量对酸性大红脱色率的影响。结果表明:废水的pH=3.0,催化剂投加量为0.1g/L是最佳反应条件;当流量为10L/h时,连续运行3h后,酸性大红染料的去除率可达92.0%;当处理水量增大时,经过两级处理,酸性大红染料的总去除率仍可达到94.4%。

Bismuth titanate photocatalyst was synthesized via an isopropanol-assisted hydrothermal method. UV-vis absorption spectra testing results revealed that the sample red-shifted comparing with TiO2, results show that surface area of the sample was14.16m2/g, average aperture was 21.05nm through BET method. Effect of different pH of wastewater and catalyst dosage on decoloring rate of Acid Bright Red Dye were studied through treating Acid Bright Red Dye in three-phase internal circulating fluidized bed. Results show that when pH of wastewater was 3.0, catalyst dosage was 0.10g/L and the flux is 10L/h, the degradation rate of Acid Bright Red Dye is up to 92.0% after 3 hours,and treating more flux of water with two stadges, the degradation rate of Acid Bright Red Dye is up to 94.4%.