Mg/Al 水滑石对腐殖酸的去除性能研究∗

摘要

Different Mg/Al ratio hydrotalcite were prepared by co-precipitation.Effect of calcination tempera-ture,adsorbent dosage,pH,the initial concentration of humic acid were studied.The results show that when Mg/Al hydrotalcite(Mg/Al ratio=3)dosage was 0.5 g/L,the concentration of humic acid was 10 mg/L,temperature was 25℃,pH was 8.5,the humic acid removal rate reached 96.64%,while the saturated adsorption capacity of hydrotalcite was 1 9.33 mg/g.Mg/Al hydrotalcite has good reusability through the study on regeneration performance.After three regeneration cycles of hydrotalcite,the regeneration rate can reach more than 95%.%采用共沉淀法制备了 Mg/Al 水滑石,并在不同温度下煅烧。探究了煅烧温度、材料投加量、pH 值、腐殖酸初始浓度对水滑石去除腐殖酸的影响。结果表明,当金属物质的量比为3的 Mg/Al 水滑石投加量为0.5 g/L, pH 值为8.5,温度为25℃时,水滑石对10 mg/L 的腐殖酸的去除率能达到96.64%,此时,水滑石的饱和吸附量为19.33 mg/g。Mg/Al 水滑石经3次再生后,对腐殖酸的去除率仍然高达95%以上,表明 Mg/Al 水滑石的可重用性好。