2007•Industrial Water & WastewaterRequires access
Adsorption characteristics of heavy metals by Na-bentonite
Ke Feng
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Abstract
The effects of Na-bentonite on the adsorption of Cu2+、Zn2+ and Cd2+ with different shaking time,concentration of heavy metal ions,granularity of mineral and pH of the solution,as well as the factors influencing the heavy metal ions adsorption by Na-bentonite were discussed.The results showed that: the adsorption of heavy metal ions by Na-bentonite was a rapid process,the maximal adsorption quantity appeared in 10 min,the Na-bentonite with different granularity had different effects on heavy metal ions adsorption,whereas,the thinner granularity didn′t mean the bigger adsorption quantity.According to the study,the effects of Na-bentonite on the adsorption of the three kinds of heavy metal ions used in the test were all good.Higher pH benifited Na-bentonite adsorpting heavy metal ions from the solution,however,considering some other factors in factual operation,pH value should not be regulated too high.