Removal of Pb(II) from aqueous solution by hydrous manganese dioxide: Adsorption behavior and mechanism
Removal of Pb(II) from aqueous solution by hydrous manganese dioxide: Adsorption behavior and mechanism
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水合二氧化锰去除水溶液中的 Pb(II)：吸附行为和机理
DOI：
10.1016/s1001-0742(12)60100-4
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发表时间：
2013-03-01
影响因子：
6.9
通讯作者：
Wang, Yili
中科院分区：
文献类型：
--
作者：
Xu, Meng;Wang, Hongjie;Wang, Yili
以高锰酸钾和过氧化氢氧化还原合成的水合二氧化锰(HIM)为脱铅剂。HMO的比表面积为79.31m(2)/g，孔容为0.07 cm(3)/g，BJH孔径为3.38 nm。298K时吸附平衡可用朗缪尔等温方程描述，Q(Max)为352.55 mg/g，ΔG为负值，Delta H和Delta S为正值，表明吸附过程是自发的吸热过程。拟二级方程对吸附数据进行了较好的拟合。计算得到PbI在HMO上的吸附活化能为38.23kJ/mol。HMO对PbO(II)的吸附与表面羟基含量的增加有关，主要吸附形态为PbOH+。铅(II)在HMO表面的最终化学状态类似于PbO。HMO是一种很有前途的去除水溶液中铅(II)的候选者。
Hydrous manganese dioxide (HIM) synthesized by redox of potassium permanganate and hydrogen peroxide was used as an adsorbent for Pb(II) removal. The specific surface area, pore volume and BJH pore diameter of the HMO were 79.31 m(2)/g, 0.07 cm(3)/g and 3.38 nm, respectively. The adsorption equilibrium at 298 K could be well described by the Langmuir isotherm equation with q(max) value of 352.55 mg/g. The negative values of Delta G and the positive values of Delta H and Delta S indicated the adsorption process was spontaneous and endothermic. The pseudo second-order equation could best fit the adsorption data. The value of the calculated activation energy for Pb(I) adsorption onto the HMO was 38.23 kJ/mol. The uptake of Pb(II) by HMO was correlated with increasing surface hydroxyl group content and the main adsorbed speciation was PbOH+. The final chemical state of Pb(II) on the surface of HMO was similar to PbO. HMO was a promising candidate for Pb(II) removal from aqueous solution.