中文摘要：

用高锰酸钾对花生壳进行改性,制成改性花生壳吸附材料,并进一步就该吸附剂对水中重金属离子Pb^2＋、Cd^2＋的吸附去除性能进行了考察,结果表明,吸附在18h后基本达到平衡,吸附Pb^2＋和Cd^2＋最佳初始pH值分别为4.5和6.5,对Pb^2＋的吸附量最大达到104.75mg·g^-1,对Cd^2＋的吸附量最大达到43.11mg·g^-1。对Pb^2＋和Cd^2＋在该吸附剂上的竞争吸附研究结果表明,竞争吸附的干扰使得Cd^2＋的吸附量降低88.47%,Pb^2＋的吸附量降低20.80%,且Pb^2＋的吸附量为Cd^2＋的5-6倍,吸附剂对重金属离子的吸附选择顺序为Pb^2＋〉Cd^2＋。

英文摘要：

The objective of this study is to seek for a low cost adsorbent material to remove heavy metal ions from aqueous solution. As a high volume agricultural waste, peanut shells were modified with KMnO4 to produce biomass adsorbent. The adsorption capacity of the modified adsorbents to remove cadmium（ II ） and plumbum（ II ） from aqueous solution were investigated in different conditions. Results showed that the optimum initial solution pH values for adsorption were 4.5 for the lead and 6.5 for cadmium, respectively. The adsorption could reach equilib- rium in about 18 hours. The maximum adsorption capacity was 104.75 mg·g^-1 for Pb^2＋ and 43.11 mg·g^-1 for Cd^2＋. In addition, the competitive adsorption of Pb^2＋ and Cd^2＋ on the modified peanut shells was investigated and the results showed the adsorption capacity of Pb^2＋ or Cd^2＋ was markedly restrained with the coexisting ions in the aqueous solution. Comparing with the sole ion adsorption results, the competitive adsorption had made adsorption capacity of Cd^2＋ and Pb^2＋ fall about 88.47% and 20.80% respectively. In the competitive adsorption test, the adsorption capacity of Pb^2＋ was about 5-6 times of Cd^2＋, which showed a preference for Pb^2＋. and indicated the adsorption selectivity sequence of the modified peanut shells for these two heavy metals is Pb^2＋〉Cd^2＋.