硅藻土对水相中Pb^(2+)的吸附

研究了吉林长白硅藻土吸附水相中Pb2+的吸附过程,讨论了各试验因素对吸附效果的影响.实验结果表明:吉林长白硅藻土对Pb2+有较好的吸附效果.该吸附过程进行得很快,在5min左右就达到吸附平衡.与酸性条件下的吸附效果相比,pH=6.5时的吸附效果最佳[ JX.4].温度对吸附效果影响不大.吸附过程中吸附剂用量少,对100 mL铅离子质量浓度为50mg/L的溶液,0.4g的硅藻土就可以使Pb2+去除率达到98%.经过硅藻土二次吸附后,铅离子去除率接近100%.

Studies the process that Pb^(2+) in hydrofacies are adsorbed onto the diatomite from Changbai Mountain Area in Jilin Province PRC, with the effect of various influencing factors on the adsorption discussed. The results revealed that the diatomite used has a favorable adsorbing effect by which only about 5 min are required for equilibrated adsorption. Compared to the adsorption effect on acidic conditions (pH<4), in this process a best effect comes out at pH=65. Temperature has no significant effect on the adsorption. In particular the adsorbent dosage required for the adsorption process is few, e.g., only 04?g diatomite was needed to remove 98% of Pb^(2+) in a 100?mL solution with Pb^(2+) concentration up to 50?mg/L. The removal rate will approach to 100% after a secondary adsorption by diatomite.