活性炭负载壳聚糖吸附Hg^(2+)的研究

Studies on the Adsorption of Hg^(2+) by Activated Carbon-Chitosan Compound Adsorbent

将脱乙酰度94.2%的壳聚糖溶解于0.5%醋酸溶液中,配制成0.5%的壳聚糖溶液,然后按照壳聚糖与活性炭质量比1∶50使壳聚糖负载在活性炭上,制成固体复合吸附剂,用于去除污水中汞离子(Hg2+)。试验表明,水中Hg2+含量100 mg/L、pH 3.7、吸附时间25 min、吸附剂用量为2.5 g/L时,水样中Hg2+的去除率为99.56%,与只用活性炭吸附相比提高了17.22个百分点。

Chitosan with 94.2% of deacetylation degree was dissolved into 0.5% acetic acid to get 0.5% chitosan-acetic acid solution.Then solid carbon-chitosan compound adsorbent was made with mass ratio of chitosan to carbon at 1∶50 to remove Hg2+ in waste water.The results indicated that when the Hg2+ content in water was 100 mg/L,pH at 3.7,the adsorption time was 25 min and the adsorbent dosage was 2.5 g/L,the removal rate of Hg2+ was 99.56%;which increased by 17.22 percentage point compared with using activated carbon only.