Abstract:

SBA-3 mesoporous silica was modified by pentaethylene hexamine (PEHA), the static electricity and hydrogen bond with amino group of SBA-3/PEHA and acid dyes improved the absorption ability of mesoporous silica. Low temperature nitrogen adsorption desorption analysis was used to characteristic SBA-3 and SBA-3/PEHA samples. The modified absorbent has lower BET surface area, average pore size and pore volumes. The effect of various parameters on the removal of acid dyes such as contact time, initial concentration, adsorbent dose, agitation speed, solution pH and reaction temperature have been studied in detail. The optimum absorption condition is: 60 min, 150rpm, 20℃, the higher initial concentration and lower pH value got the higher adsorbing capacity.

Key words: modified SBA-3, pentaethylene hexamine, acid dye, absorption, wastewater treatment