Baker Hutaf M, Massadeh Adnan M, Younes Hammad A
Department of Chemistry, Faculty of Science, Al al-Bayt University, P.O. Box 130091, Mafraq, 25113, Jordan.
Environ Monit Assess. 2009 Oct;157(1-4):319-30. doi: 10.1007/s10661-008-0537-6. Epub 2008 Oct 2.
The adsorption behavior of natural Jordanian zeolites with respect to Cd(2 + ), Cu(2 + ), Pb(2 + ), and Zn(2 + ) was studied in order to consider its application to purity metal finishing drinking and waste water samples under different conditions such as zeolite particle size, ionic strength and initial metal ion concentration. In the present work, a new method was developed to remove the heavy metal by using a glass column as the one that used in column chromatography and to make a comparative between the batch experiment and column experiment by using natural Jordanian zeolite as adsorbent and some heavy metals as adsorbate. The column method was used using different metal ions concentrations ranged from 5 to 20 mg/L with average particle size of zeolite ranged between 90 and 350 mum, and ionic strength ranged from 0.01 to 0.05. Atomic absorption spectrometry was used for analysis of these heavy metal ions, the results obtained in this study indicated that zeolitic tuff is an efficient ion exchanger for removing heavy metals, in particular the fine particle sizes of zeolite at pH 6, whereas, no clear effect of low ionic strength values is noticed on the removal process. Equilibrium modeling of the removal showed that the adsorption of Cd(2 + ), Cu(2 + ), Pb(2 + ), and Zn(2 + ) were fitted to Langmuir, Freundlich and Dubinin-Kaganer-Radushkevich (DKR). The sorption energy E determined in the DKR equation (9.129, 10.000, 10.541, and 11.180 kJ/mol for Zn(2 + ), Cu(2 + ), Cd(2 + ) and Pb(2 + ) respectively) which revealed the nature of the ion-exchange mechanism.
研究了天然约旦沸石对Cd(2+)、Cu(2+)、Pb(2+)和Zn(2+)的吸附行为，以考虑其在不同条件下（如沸石粒径、离子强度和初始金属离子浓度）应用于净化金属加工饮用水和废水样品。在本研究中，开发了一种新方法，使用玻璃柱（如柱色谱中使用的玻璃柱）去除重金属，并以天然约旦沸石为吸附剂、一些重金属为被吸附物，对批量实验和柱实验进行比较。柱法使用不同金属离子浓度范围为5至20mg/L，沸石平均粒径范围为90至350μm，离子强度范围为0.01至0.05。采用原子吸收光谱法分析这些重金属离子，本研究获得的结果表明，沸石化凝灰岩是一种去除重金属的有效离子交换剂，特别是在pH值为6时的细粒径沸石，而低离子强度值对去除过程没有明显影响。去除的平衡模型表明，Cd(2+)、Cu(2+)、Pb(2+)和Zn(2+)的吸附符合朗缪尔、弗伦德利希和杜比宁-卡加内尔-拉杜什凯维奇（DKR）模型。在DKR方程中确定的吸附能E（Zn(2+)、Cu(2+)、Cd(2+)和Pb(2+)分别为9.129、10.000、10.541和11.180kJ/mol）揭示了离子交换机制的性质。
