An efficient modified zeolite for simultaneous removal of Pb(II) and Hg(II) from aqueous solution
An efficient modified zeolite for simultaneous removal of Pb(II) and Hg(II) from aqueous solution
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DOI：
10.1016/j.molliq.2017.01.029
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发表时间：
2017-03-01
影响因子：
6
通讯作者：
Nezamzadeh-Ejhieh, Alireza
中科院分区：
文献类型：
--
作者：
Shirzadi, Hamid;Nezamzadeh-Ejhieh, Alireza
采用机械方法制备伊朗天然斜发沸石，制备微粉化（MC）和纳米颗粒（NC）。采用十六烷基三甲基溴化铵（HDTMABr）对MC和NC颗粒进行改性，所得表面活性剂改性沸石（MSMZ和NSMZ）是良好的阴离子或有机化合物吸附剂，然后用双硫腙（MSMZ-DT和NSMZ-DT）进行改性。通过 XRD、FTIR、SEM-EDAX、BET 和 TG 对样品进行了表征。原始样品和改性样品用于同时去除水溶液中的 Hg(II) 和 Pb(II)。改性样品，尤其是纳米颗粒样品；相对于相应的原始样品，NSMZ-DT 显着去除了 Hg(II) 和 Pb(II)，因为在修改后的样品中，离子交换和络合过程均负责去除阳离子。吸附等温线很好地符合Langmuir方程，表明Hg(II)/Pb(II)的单层吸附，而吸附动力学遵循伪二级速率方程，表明化学反应是限速步骤的原因。该过程是放热且自发的，基于负 Delta H 和 Delta G 值。 (C) 2017 Elsevier B.V. 保留所有权利。
An Iranian natural clinoptilolite was mechanically prepared to prepare micronized (MC) and nanoparticles (NC). MC and NC particles were modified by Hexadecyltrimethylammonium bromide (HDTMABr) and the obtained surfactant modified zeolites (MSMZ and NSMZ), as good anion or organic compounds adsorbents, were then modified by Dithizone (MSMZ-DT, and NSMZ-DT). Samples were characterized by XRD, FTIR, SEM-EDAX, BET and TG. The raw and modified samples were used for simultaneous removal of Hg(II)and Pb(II) from aqueous solution. The modified samples, especially nanoparticles one; NSMZ-DT, significantly removed Hg(II) and Pb(II) with respect to the corresponding raw samples, because in the modified samples both ion-exchange and complexation processes are responsible for removing of cations. Adsorption isotherms well fitted to Langmuir equation, that indicates monolayer sorption of Hg(Il)/Pb(II) while the adsorption kinetic obeyed the pseudo second-order rate equation indicates that a chemical reaction is responsible for the rate limiting step. The process is exothermic and spontaneous based on negative Delta H and Delta G values. (C) 2017 Elsevier B.V. All rights reserved.