纳米CeO_2对铅锌尾矿中重金属离子溶出特性影响的研究

铅锌尾矿中含有多种重金属成分,在一定环境下会溶出并造成严重的污染。在对铅锌尾矿品的物相组成、化学成分、重金属离子含量、有机物含量和pH值等基本特性进行表征的基础上,研究了添加纳米CeO_2前后样品在不同pH值下重金属离子的浸出规律,探究了纳米CeO_2作为尾矿中重金属离子吸附剂的最佳掺量以及pH值对CeO_2吸附重金属离子的影响。结果表明,铅锌尾矿中重金属离子的溶出量随着pH值的增大而降低;CeO_2最佳掺量为尾矿质量的0.5%;pH值在5~8之间,CeO_2对各重金属离子均具有较高的吸附率。因此,提出了一种降低铅锌尾矿污染的新方案。

MCM-41分子筛的氨三乙酸功能化及对重金属离子吸附特性研究

用氨三乙酸酐对MCM-41介孔分子筛进行功能化,制备了NATT-MCM-41吸附材料,研究其对废水中Pb^(2+)和Cu^(2+)的吸附特性。XRD、TEM、FT-IR分析表明,MCM-41分子筛表面成功引入了氨三乙酸分子的氨基和酯基基团。NATT-MCM-41吸附剂投加量为1 g/L,Pb^(2+)和Cu^(2+)的初始浓度为150 mg/L,达到吸附平衡后,NATT-MCM-41对Pb^(2+)和Cu^(2+)的吸附量分别为123.5 mg/g和103.4 mg/g;NATT-MCM-41对Pb^(2+)和Cu^(2+)吸附的最佳p H范围为5.0,吸附去除率分别达到95%和90.4%;NATT-MCM-41循环5次后依然表现出良好的吸附去除性能,说明NATT-MCM-41在处理废水重金属离子方面有较好的应用前景。

Study on the Structure and Characteristics of Recyclable Copper Removal Adsorbent

A recyclable copper removal adsorbent was developed from diatomite and alu- minum sludge composite materials. The. effects of different formulas on the adsorption of Cu2~ under different conditions were discussed. The properties and rnicrostructures of the samples were characterized. The results showed that the optimum pH value, contacting time and raw materials proportion for copper removal are 6, 90 min and 40：60 （sludge： diatomite）, respectively, The copper removal capacity could reach 0.46 mg/g at the initial copper concentration of 5 mg/L. There was no change in the composition of crystal phase before and after copper removal, so physical adsorption was dominant during the adsorption process.