重金属镉污染水体的吸附修复研究

研究了玉米秸秆的用量、时间、溶液pH、初始镉质量浓度对玉米秸秆吸附性能的影响。结果表明:在镉的初始质量浓度小于 20mg/L时,处理 24h去除率最高;而当初始质量浓度达到 50mg/L,则在本研究设置的时间处理中没有发现差异。pH是影响吸附的重要因素,在pH=4~6的弱酸性条件下吸附效果较好。所用玉米秸秆质量与重金属的去除效率直接相关。

Study on adsorption of Cd2+ contaminated water by corn stalk

The influences of the factors,such as the dosage of corn stalk,time,pH and initial concentration of Cd~(2 ) on the adsorbing performance of corn stalk are studied.The results show that when the initial concentration of Cd~(2 ) is less than (20 mg/L) and treating time is 24 h,the removing rate of Cd~(2 ) in contaminated water is highest.Even the initial concentration of Cd~(2 ) is up to 50 mg/L,there is no change of the removing rate of Cd~(2 ).While the pH of solution is an important factor to effect the adsorption,when pH=4~6,the adsorption effect is best.The quality of the corn stalk has directly relation with the removing of Cd~(2 ).