TiO_2/生物质活性炭复合材料的制备和吸附光降解性能

Preparation and Photo Degradation Property of TiO_2/Bio-Activated Carbon Composites

本文以自制生物质活性炭(BAC)为原料,采用凝胶-溶胶法合成TiO_2/BAC复合材料。对复合材料进行扫描电镜、傅里叶变换红外光谱、X射线衍射和N_2吸附等表征;并研究该复合材料对中性红、亚甲基蓝染料及甲醛的吸附降解性能。结果表明,当复合材料制备时BAC的添加量为7g(即BAC与(BuO)_4Ti的质量体积比为1∶5)、复合材料的用量为0.7g、预吸附时间为2h时,对染料具有最佳的吸附降解效果,复合材料在循环使用5次后对染料的吸附降解率仍达到80%以上。当复合材料制备时BAC的添加量为6g、复合材料的添加量为2g时,其对甲醛的吸附降解达到最大,可达63.41%。该复合材料有望用于废水中亚甲基蓝、中性红等染料的去除及家居甲醛的净化。

Using homemade biomass activated carbon（BAC） as raw material,TiO2/bio-activated carbon（TiO2/BAC） were synthesized by sol-gel method. The TiO2/BAC was characterized by SEM,FTIR,XRD and nitrogen adsorption isotherms. The adsorption performance of the composite materials on neutral red,methylene blue and formaldehyde was studied. The results showed that,when the addition of biomass activated carbon was 7 g in preparing of the composite material,i. e. BAC（wt）/（BuO）4Ti（vol） = 1 ∶ 5,the amount of composite material was 0. 7 g and the pre-adsorption time was 2 h,the composite material has the best adsorption degradation effect for dyes.The adsorption degradation rate of the TiO2/BAC composites material still reached more than 80% after 5 cycles of reuse. When the addition of biomass activated carbon was 6 g and the addition of composites material was 2 g,the adsorption degradation rate of the composite material to formaldehyde reached a maximum of 63. 41%. The composite material is expected to be used for the removal of methylene blue and neutral red in wastewater and the degradation of formaldehyde in indoor environment.