高锰酸钾改性对颗粒活性炭吸附Cu^(2+)的影响  

Effect of Modification with KMnO4 on the Cu^(2+) Adsorption of Granular Activated Carbon

作　　者：赵梅青[1] 马子川[1] 张立艳[1] 吴银素[1] 张丽娜[1] 

机构地区：[1]河北师范大学

出　　处：《金属矿山》2008年第11期110-113,共4页Metal Mine

基　　金：国家自然科学基金项目(编号:20477009);河北省自然科学基金项目(编号:E2005000183)。

摘　　要：采用KMnO4溶液在回流状态下对颗粒活性炭进行了改性。考察了KMnO4溶液浓度对Cu2+吸附率-pH曲线及pH的影响,并研究了KMnO4改性对颗粒活性炭吸附和解吸Cu2+性能的影响。结果表明,KMnO4改性使颗粒活性炭对Cu2+吸附率-pH曲线及pH向低pH偏移。当KMnO4溶液浓度为0.03 mol/L时,改性颗粒活性炭效果最好;KMnO4改性提高了颗粒活性炭对Cu2+的吸附速率,使其投加量节省约3倍;Cu2+在改性及未改性活性炭上的吸附遵循Freund lich等温吸附方程,在相同Cu2+平衡浓度下,KMnO4改性活性炭对Cu2+的吸附量提高约2.7倍;使用0.35 mol/L的HC l溶液作解吸液,Cu2+从KMnO4改性活性炭上的解吸率为91.1%,而Cu2+从未改性活性炭上的解吸率仅为8.8%。KMnO4改性提高了颗粒活性炭从水中吸附重金属离子的能力,并促进了其解吸再生性能。Granular activated carbon was modified with KMnO4 at refluxing. The influence of KMnO4 concentration on the Cu^2＋ adsorption rate-pH curves and pH was investigated and the effect of the modification with KMnO4 on the Cu^2＋ adsorption and desorption capacities of activated carbon was studied. The resuhs show that the Cu^2＋ adsorption rate-pH curves and pH of activated carbon move to the lower pH side after modification with KMnO4. The best result is achieved at 0.03mol/L KMnO4 concentration. The modification with KMnO4 has improved the adsorption rate of Cu^2＋ and reduced the consumption of adsorbent by three times compared with that of unmodified carbon. The Cu^2＋ adsorption on the modified and unmodified activated carbon conforms to the Freundlich isothermal adsorption equation. At a same equilibrium concentration of Cu^2 ＋ , the Cu^2＋ adsorption amount on the activated carbon modified with KMnQ is about 2.7 times higher than that on unmodified carbon. When 0.35mol/L HCl solution is used as elution solution, the desorption rates of Cu^2＋ on the KMnQ modified activated carbon and unmodified activated carbon are 91.1% and 8.8% respectively. The modification with KMnO4 has not only increased the adsorption capacity of granular activated carbon for heavy metal ions, but also improved its desorption-regeneration performance.

关 键 词：活性炭 改性 高锰酸钾 吸附 CU^2+ 

分 类 号：X703[环境科学与工程—环境工程] TQ424.1[化学工程]