介孔C/SiO2粉体的制备及对阳离子型染料的吸附

摘要

采用吸附法处理染料废水需要合适的吸附剂.利用溶剂蒸发自组装法,以甲阶酚醛树脂为碳源、介孔SiO2粉体为载体制备介孔C/SiO2粉体,表征所制C/SiO2粉体的结构,研究C/SiO2粉体对阳离子型染料亚甲基蓝和阳离子红X-GRL的吸附性能,并与相同条件下制备的非负载的多孔C粉体以及介孔SiO2载体进行比较.结果表明,介孔C/SiO2粉体的孔窗口为11～18 nm,比表面积为303 m2·g-1,比孔容为1.11 cm3·g-1；C/SiO2粉体对这两种染料吸附量均高于C粉体和SiO2载体；在pH≤10的范围内,吸附量随pH值增大而显著提高.%Mesoporous C/SiO2 powder was synthesized by solvent evaporation induced self-assembly method using resol as the cabon source and mesoporous SiO2 powder as the support. The microstructure of the title powder was characterized. The adsorption of methylene blue and cationic red X-GRL on C/SiO2 powder was investigated. The adsorption capacity on the title material was compared with those on mesoporous SiO2 support and unsupported C powder synthesized under the same condition. The mesoporous C/SiO2 powder has a pore window size of 11～ 18 nm, a specific surface area of 303 m2·g-1, and a specific pore volume of 1.11 cm3·g-1. The adsorption capacity of methylene blue and cationic red X-GRL on C/SiO2 powder is higher than that on porous C powder or mesoporous SiO2 support. The adsorption capacity of these two dyes on C/SiO2 powder increases remarkably with the increase in pH value provided that the pH value of the system is