天然火山灰是火山起源的无定形硅酸盐基材料。在这项工作中,以3-氨基丙基三乙氧基硅烷(APTES)为接枝剂对天然火山灰进行改性。这种材料的特征是pHpzc,N2吸附/解吸曲线,FTIR,TGA/DTG,DRUV,SEM,和基本分析。官能化材料用于使用分批接触吸附从水溶液中去除反应性黑5(RB-5)和亮绿1(BG-1)染料。改性火山灰的FTIR表征,TGA/DTG,BET,和DRUV-vis揭示了在火山灰结构上接枝胺官能团的有效性。对于两种染料,动力学吸附数据都可以更好地拟合一般顺序,而对于平衡模型,Liu等温线模型可以更好地拟合。对于BG-1和RB-5,在pH9.0和2.0下,用改性火山灰获得的最大吸附容量Qmax(在50°C下)分别为350.6和300.9mgg-1。热力学参数表明,染料的去除是自发的和吸热的。还测试了改性材料对模拟染料房流出物的处理,显示出非常高的效率。
Natural pozzolan is an amorphous silicate-based material of volcanic origin. In this work, the natural pozzolan was modified by using 3-aminopropyltriethoxysilane (APTES) as a grafting agent. This material was characterized by pHpzc, N2 adsorption/desorption curves, FTIR, TGA/DTG, DRUV, SEM, and elementary analysis. The functionalized materials were used for the removal of Reactive Black 5 (RB-5) and Brilliant Green 1 (BG-1) dyes from aqueous solutions using batch-contact adsorption. The characterization of modified pozzolan by FTIR, TGA/DTG, BET, and DRUV-vis revealed the effectiveness of grafting of amine functional group on pozzolan structure. The kinetic adsorption data were better fitted with general order for both dyes while for equilibrium models were better fitted by the Liu isotherm model. The maximum sorption capacities Q max (at 50 °C) obtained with the modified pozzolan were 350.6 and 300.9 mg g-1 for BG-1 and RB-5, at pH 9.0 and 2.0, respectively. The thermodynamic parameters show that the removal of dyes was spontaneous and endothermic. The modified material was also tested for the treatment of simulated dye house effluents showing very high efficiency.