碳纳米管/SiO_2气凝胶对水溶液中甲苯的吸附性能

Adsorption of Toluene from Aqueous Solutions with CNTs/SiO_2

以正硅酸乙酯(TEOS)为原料、氧化碳纳米管(CNTs-COOH)为添加物,采用溶胶–凝胶法,经表面改性、高温还原制备碳纳米管/SiO_2气凝胶(CS).通过傅里叶变换红外光谱(FTIR)、BET等进行表征,采用最佳比例的CS研究其对水溶液中甲苯的吸附性能.结果表明:掺杂3%,CNTs-COOH的CS(3%,CS)的松散堆密度为170,kg/m^3,比表面积、平均孔径分别为1,021,m^2/g、15.39,nm,对水溶液中甲苯的最大饱和吸附量为203,mg/g,且吸附过程符合Langmuir等温吸附模型.

With tetraethoxysilane（TEOS）as the raw material,and the oxidized carbon nanotubes（CNT-COOH）as the additive,CNTs/SiO_2 aerogels（CS）were prepared with the sol-gel method,and then given surface modification and high temperature treatment.Fourier Transform Infrarespectroscopy（FTIR）and BET were used to characterize the as-synthsized aerogels,and adsorption experiments using optimized CS to adsorb toluene in aqueous solution were carried out.The results show that the bulk density of CS with 3%, CNTs-COOH is 170 kg/m^3,its specific surface area and average pore diameter are 1,021,m^2/g and 15.39,nm,respectively,and the maximum saturated adsorption capacity of 3%,CS for toluene in aqueous solution was 203,mg/g.The adsorption process was in accordance with the Langmuir isotherm model.