改性淀粉在低浓度含镉废水处理中的应用实验  被引量:17

Removal of cadmium ions from low concentration wastewater containing cadmium by modified starch

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作  者:张延霖[1] 张秋云[1] 王婷[1] 

机构地区:[1]华南师范大学化学与环境学院,广东广州510006

出  处:《化工学报》2009年第2期460-464,共5页CIESC Journal

摘  要:Graft copolymerization of acrylamide onto starch and reaction with mercaptoacetic acid subsequently were studied.The reaction product(St-AM-MCAA) was used in the treatment of wastewater containing low concentration cadmium ion(0.40 mg·L-1) as additive.An investigation was carried out to study the effect of St/AM(mass ratio of starch to acrylamide) on the grafting ratio and grafting efficiency and the content of thiol(SH) group.It was found that the cadmium ion removal percentage by St-AM-MCAA3 reached 89.7% and the residual concentration of cadmium ion in treated water was under 0.10 mg·L-1 in the conditions of pH=8 and additive concentration of 2.0 g·L-1 by selecting a high grafting ratio and thiol content product St-AM-MCAA3 as additive.The ability of St-AM-MCAA3 to remove low concentration wastewater containing cadmium ion was higher than that of St-AM3 by 10%.Graft copolymerization of acrylamide onto starch and reaction with mercaptoacetic acid subsequently were studied. The reaction product (St-AM MCAA) was used in the treatment of wastewater containing low concentration cadmium ion (0.40 mg · L^-1 ) as additive. An investigation was carried out to study the effect of St/AM (mass ratio of starch to acrylamide) on the grafting ratio and grafting efficiency and the content of thiol (SH) group. It was found that the cadmium ion removal percentage by St-AM- MCAA3 reached 89.7% and the residual concentration of cadmium ion in treated water was under 0.10 mg ·L^-1 in the conditions of pH=8 and additive concentration of 2.0 g · L^-1 by selecting a high grafting ratio and thiol content product St-AM-MCAA3 as additive. The ability of St AM MCAA3 to remove low concentration wastewater containing cadmium ion was higher than that of St-AM3 by 10%.

关 键 词:含镉废水 淀粉 巯基乙酸 丙烯酰胺 

分 类 号:TQ316[化学工程—高聚物工业]

 

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