改性泥炭对Pb~(2+)、Ni~(2+)、Cu~(2+)的吸附性能研究

在静态条件下,研究了改性泥炭对重金属离子Pb2+、Ni2+、Cu2+的吸附性能,着重探讨了改性泥炭去除废水中重金属离子Pb2+、Ni2+、Cu2+的适宜条件,同时对改性泥炭的吸附及解吸再生机理进行了初步分析。结果表明:在25℃条件下,当pH值为5～7、吸附剂用量为2g/L、吸附时间为2h时,改性泥炭对Pb2+、Ni2+、Cu2+的去除率分别为98.0%、96.7%、95.5%。吸附了重金属离子的改性泥炭经酸解吸再生后,可循环使用,不会带来二次污染。

Absorbability of Modified Peat for Wastewater Containing Pb2+, Ni2+ and Cu2+

A modified peat absorbent with excellent absorbability was prepared using peat as the major raw material.The peat mixed with a given amount of strong sulfuric acid was sulfonated,and then mixed with polyvinylalcohol and formaldehyde to enhance the mechanical intensity.The absorbability of modified peat to heavy metal ions such as Pb2+,Ni2+ and Cu2+ was examined under static state conditions,with an emphasis on determining the suitable conditions for the removal of Pb2+,Ni2+ and Cu2+ in wastewater by the modified peat.The adsorption,desorption and regeneration mechanism for the modified peat were preliminarily discussed.The results show that when pH value was 5.0 to 7.0,the absorbent amount was 2g/L and the adsorption time was 2h under 25℃,the removal rate of the modified peat to Pb2+,Ni2+ and Cu2+ was 98%,96.7%,and 95.5%,respectively.When the modified peat adsorbing heavy metal ions was desorbed and regenerated by acid,it could be reutilized,and bring no secondary pollution.