Retention of copper, cadmium and lead from water by Na-Y-Zeolite confined in methyl methacrylate shell
Retention of copper, cadmium and lead from water by Na-Y-Zeolite confined in methyl methacrylate shell
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DOI：
10.1016/j.jece.2017.06.049
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发表时间：
2017-08-01
影响因子：
7.7
通讯作者：
Kouta, E. Y.
中科院分区：
文献类型：
--
作者：
Elwakeel, K. Z.;El-Bindary, A. A.;Kouta, E. Y.
采用间歇吸附法研究了甲基丙烯酸甲酯-Na-Y-沸石（MMA-Na-Y-Zeolite）复合材料对水溶液中Cu（II）、Cd（II）和Pb（II）的吸附，考察了pH、吸附时间、金属离子初始浓度、吸附剂用量和温度等因素对吸附效果的影响。采用红外光谱、扫描电镜、X射线衍射等手段对吸附剂进行了表征。动力学剖面成功地模拟与伪二级速率方程。Langmuir，Dubininin-Radushkevich和Temkin方程拟合良好的吸附等温线的Cu（II）和Cd（II），而Pb（II）在平衡时的分布不符合任何研究的吸附等温线。还评估了吸附的自由能（Δ G度）、焓（Δ H度）和熵（Δ S度）的变化。吸附Cu（II）和Cd（II）的热力学表明吸热性质，在另一侧记录为Pb（II）的放热吸附。MMA-Na-Y沸石对Cu（II）、Cd（II）和Pb（II）的再生率分别达到96.6%、98.18%和98.4%。结果表明，MMA-Na-Y-沸石复合材料可以作为一种低成本的去除真实的水样中重金属的材料。
The adsorption of Cu(II), Cd(II) and Pb(II) from aqueous solution onto methyl methacrylate-Na-Y-Zeolite (MMA-Na-Y-Zeolite) composite was analyzed in a batch system with respect to pH, contact time, initial metal ion concentration, adsorbent dosage and temperature. The sorbent was characterized by FT-IR spectrometry, SEM analysis and X-ray diffraction (XRD). Kinetic profiles are successfully modeled with the pseudo-second order rate equation. The Langmuir, the Dubinin-Radushkevich and Temkin equations fit well-adsorption isotherms of Cu (II) and Cd(II), while the distribution of Pb(II) at equilibrium did not fit any of the studied adsorption isotherms. The change of free energy (Delta G degrees), enthalpy (Delta H degrees) and entropy (Delta S degrees) of adsorption were also evaluated. The thermodynamics of the adsorption Cu(II) and Cd(II) indicated endothermic nature, on the other side exothermic adsorption was recorded for Pb(II). The regeneration efficiency of MMA-Na-Y-Zeolite reached 96.6%, 98.18% and 98.4% for Cu(II), Cd(II) and Pb(II), respectively. The results indicate that MMA-Na-Y-Zeolite composite could be employed as low-cost material for the removal of heavy metals from real water samples.