巯基化乙基桥联介孔有机硅材料的制备及其吸附亚甲基蓝的研究

为了探究介孔硅材料对水溶液中亚甲基蓝(MB)的吸附效果,首先以溴代十六烷基三甲胺(CTAB)为模板剂,双-(三乙氧基硅基)乙烷(BTEE)为硅源在碱性条件下合成了乙基桥联(PMOs),再利用MPTS对乙基桥联PMOs进行巯基功能化的改性,合成了巯基化乙基桥联介孔有机硅材料(SH-PMOs)。总的来说,在相同的最佳实验条件下,改性后的功能化PMOs比未改性的PMOs具有更优的吸附性能。其中,SH-PMOs的加入量越多,对MB的去除率也越大。PMOs和SH-PMOs都表现出了很好的吸附能力,吸附速率快,吸附时间10 min时即可达到吸附平衡。pH值对PMOs和SH-PMOs吸附MB的效果产生了很重要的影响,在较酸和碱性过高的环境下,吸附效果不佳,当pH=8左右时,有最佳吸附效果。在最佳pH值下,PMOs和SH-PMOs对MB的吸附量都可以达到450 mg/g。

SYNTHESIS OF MERCAPTO-PERIODIC MESOPOROUS ORGANOSILICAS AND ITS ADSORPTION CAPABILITY FOR METHYLENE BLUE

Ethane-bridged PMOs was synthesized under basic conditions by using BTEE as the silica precursor in the presence of CTAB as the surfactant,and followed by the post-modification by MPTS.The resulted PMOs materials were characterized by XRD and N2 sorption.Furthermore,the adsorption capability of PMOs materials on the MB in aqueous solution were investigated in detail,respectively.Generally,the organic-functionalized PMOs show a slight better adsorption performance compared to the unmodified PMOs.Under the same optimal experimental conditions,the modified functionalized PMOs had better adsorption performance than the unmodified PMOs.Among them,the more the amount of SH-PMOs added,the greater the removal rate of MB.Both PMOs and SH-PMOs showed good adsorption capacity,fast adsorption rate,and adsorption equilibrium could be reached in 10min.pH has a very important effect on the adsorption of MB by PMOs and SH-PMOs.The adsorption effect is not good in environments with higher acidity and alkalinity.When pH=8,it has the best adsorption effect.At the optimal pH,the adsorption capacity of MB by PMOs and SH-PMOs can reach 450 mg/g.