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以天然凹凸棒土为原料,以去除以腐殖酸为代表的天然有机物为目的,研究酸活化、热处理和十八烷基三甲基氯化铵(OTAC)有机改性3种改性方法,进行定向筛选。进一步比较3种方法联合改性凹土后对腐殖酸的吸附效果,确定最优定向改性方法。结果表明,先酸处理后OTAC改性凹土对腐殖酸的吸附效果最好,改性凹土投药量为0.7 g/L时,腐殖酸的去除率可达97%。利用正交实验确定凹土改性的最佳工艺条件、钠化时间和有机改性剂的用量对改性凹土吸附腐殖酸的能力影响显著。改性的最佳工艺条件为:酸浓度3 mol/L,氯化钠浓度0.5 mol/L,钠化时间2 h,改性剂用量为凹土质量的3%,微波改性时间为9 min。单独投加改性凹土时p H值对腐殖酸的吸附效果有重要影响。该方法制备的改性凹土在水处理工艺有良好的应用前景。
With natural attapulgite as raw material and the removal of humic acid as the representative of natural organic compounds, three kinds of modification methods of acid activation, heat treatment and organic modification of octadecyl trimethyl ammonium chloride (OTAC) Targeted screening. Further comparison of the three methods combined with modified soil after adsorption of humic acid, to determine the optimal orientation modification method. The results showed that after acid treatment, OTAC modified attapulgite had the best adsorption effect on humic acid. When the amount of modified attapulgite was 0.7 g / L, the removal rate of humic acid could reach 97%. Orthogonal experiments to determine the optimum conditions for modified soils, sodium modification time and the amount of organic modifier on the ability of modified soils adsorbed humic acid significantly. The optimum conditions for the modification were as follows: acid concentration 3 mol / L, sodium chloride concentration 0.5 mol / L, sodiumization time 2 h, modifier dosage 3% of attapulgite quality, microwave modification time 9 min . The p H value of the modified attapulgite alone has an important effect on the adsorption of humic acid. The modified attapulgite prepared by the method has good application prospect in the water treatment process.