天然锰钾矿吸附水溶液中Hg^(2+)的实验研究  

The Sorption of Hg^(2+) from Aqueous Solution by Natural Cryptomelane

作　　者：郑德圣[1] 鲁安怀[2] 秦善[2] 姜浩[1] 郑喜珅[2] 赵谨[1] 

机构地区：[1]中国地质大学材料科学与工程学院,北京100083 [2]北京大学地质系,北京100871

出　　处：《岩石矿物学杂志》2001年第4期559-564,567,共7页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目 (4 9972 0 17)

摘　　要：利用粉碎分级的天然锰钾矿去除水溶液中Hg2 + 的实验研究表明 :反应平衡时间约为 2 0小时 ;pH值对其吸附率影响很大 ,在中性 (氯化物在偏碱性 )条件下吸附率较高 ;溶液中阳离子的存在会产生竞争吸附而降低对Hg2 + 的吸附量 ,2价金属离子较 1价金属离子对Hg2 + 竞争干扰明显 ;溶液中Cl- 的存在能明显降低对Hg2 + 的吸附量。对等温吸附曲线的回归分析得出在浓度为5～ 35 0mg/L段能很好地符合Langmuir单吸附位吸附曲线 ,并计算出在该实验条件下其最大理论吸附量为 2 7.6mg/g。解吸实验结果表明 ,在无其他电解质参与的条件下解吸量较少 ,受多种电解质干扰时其解吸率不超过 2 0 %。The sorption of Hg 2+ from aqueous solution was studied under variant conditions. Factors considered included diameters, pH values and different electrolytes .The final equilibrium was attained within 1～2 days. The investigation indicates that the gross adsorption quantity varies mainly with the pH values. In the solution that does not have other electrolytes or contains NaNO 3 or K 2SO 4, the gross adsorption quantity reaches the peak in neutral condition. As for the chlorates, the peak appears in the weakly alkaline condition. Comparing the effects of the ions, the authors conclude that the presence of Cl - decreases the gross quantity of the adsorption conspicuously, and the high value metal cations decrease the gross more effectively than the low value cations. The regression equation indicates that the adsorption of Hg 2+ between the concentration of 5 and 350 mg/L fits the single site langmuir sorption. The maximum adsorption quantity is 27.6 mg/g.

关 键 词：天然锰钾矿 吸附作用 重金属污染物 汞离子 水污染 

分 类 号：X703[环境科学与工程—环境工程] X132