Adsorption of organic phosphorus in pesticide wastewater by CaAI hydrotalcite

采用共沉淀法制备了CaAl水滑石（CaAl-LDH），并运用扫描电子显微镜（SEM）和热重／差示扫描量热分析（TG—DSC）技术对CaAl-LDH的形貌及热稳定性进行了表征。采用CaAl-LDH对含膦农药废水进行除膦吸附试验，探讨了搅拌时间、pH值、CaAl-LDH的加入量对吸附性能的影响。结果表明：当CaAl-LDH的加入量为80g／L，搅拌时间为3h，pH值为6—8时，CaAl-LDH对膦的吸附性最强，废水中膦质量分数仅为0．1×10^-6。CaAl hydrotalcite （CaAl-LDH） was prepared by coprecipitation method. The morphology and thermal stability of CaAl-LDH was characterized by scanning electron microscopy （SEM） and thermogravimetry/differential scanning calorimetry （TG - DSC ）. The test of phosphine adsorption removal by CaAl-LDH from phosphine pesticide wastewater was carried out. The results showed that when the addition amount of CaAl-LDH was 80 g/L, the stirring time was 3 h, and the pH value was from 6 to 8, CaAl-LDH had the strongest adsorption to phosphine, and the mass fraction of phosphine in wastewater was only 0.1× 10^-6