碳硅介孔材料对水中Cr6+和苯酚的吸附性能研究

摘要

以正硅酸乙酯(TEOS)为硅源,十六烷基三甲基溴化铵(CTAB)为模板和碳源,用水热合成法制备介孔氧化硅(MCM-41),再加浓硫酸,经过干燥、煅烧、水洗,得到介孔碳硅复合材料.考察其对环境水体中Cr6+和苯酚的吸附性能.结果表明,吸附苯酚的最适条件:30 ℃,pH=5,吸附时间24 h,此时饱和吸附量为7~11 mg/g;吸附Cr6+的最适条件:20 ℃,pH=8,吸附时间24 h,饱和吸附量为15~20 mg/g.用材料吸附微污染水中Cr6 +和苯酚,去除率分别达到70%和79.77%.%With TEOS as the silicon source,CTAB as the template and carbon source,MCM-41 was pre-pared by hydrothermal synthesis. Then concentrated sulfuric acid was used to obtain the materials by drying,calcining and washing.Furthermore the adsorption properties of Cr6+and phenol in environmental water are studied.The result showed that the optimum conditions for adsorption of phenol were:30 ℃,pH=5,adsorption time 24 h,so saturated adsorption capacity was 7~11 mg/g;the optimum conditions for adsorption of Cr6+were:20 ℃,pH =8,adsorption time 24 h,saturated adsorption capacity was 15 ~20 mg/g.At the same time,the removal rate of hexavalent chromium ions and phenol in the micro-pollu-tion water is 70% and 79.77% respectively.