介孔TiO2/SiO2复合材料对铅离子的吸附性能

摘要

In order to improve serious pollution caused by heary meatal ions,spherical meso-porous TiO2/SiO2 composites were prepared by sol-gel method.SEM and BET surface area a-nalysis was used to characterize the composites,and the effect of pH,temperature,contact time etc.was investigated.The result shows that the TiO2/SiO2 is effective in removing lead ion and the maximum adsorption capacity is 8mg/g when the optimal adsorption condition is pH 6,constant temperature 35℃,addition of the composite 0.025 g and contact time 25 min.%为改善重金属离子对环境造成的严重污染,通过溶胶凝胶法制备了球形介孔 TiO2/SiO2复合材料,利用扫描电镜(SEM,scanning electron microscope)和比表面积分析法对复合材料进行表征,考察了pH、温度和吸附时间等对介孔TiO2/SiO2吸附Pb2+的影响.结果表明,球形介孔TiO2/SiO2复合材料对溶液中 Pb2+具有良好的吸附性能.在最佳吸附条件 pH 为6、吸附温度35℃、复合材料的加入量为25mg、吸附时间25min时,吸附量达到8mg/g.