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首页> 外文期刊>Chemical Science International Journal >Studies of Oxyanion Removal from AqueousSolution Using Zeolite and HDTMA-Br SurfaceModified Organo-Zeolite
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Studies of Oxyanion Removal from AqueousSolution Using Zeolite and HDTMA-Br SurfaceModified Organo-Zeolite

机译：沸石和HDTMA-Br表面改性有机沸石从水溶液中去除高氧阴离子的研究

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In the present study, the Jordanian zeolite was modified with cationic surfactant, hexadecyltrimethylammonium bromide (HDTMA-Br), and this organo-zeolite was used to remove the nitrate ion (oxyanion). Batch experiments were carried out using zeolite at different parameters; isotherms equilibrium models Langmiur, Freundlich, Dubinin-Radushkevich and Redlich-Peterson were investigated at different temperature values 25, 30, 35, 40 and 45°C. Redlich-Peterson, Freundlich and Dubinin-Radushkevich models showed that the experimental equilibrium data followed these models better than that of Langmuir model. The calculated energy using Dubinin-Radushkevich model was found to vary from 0.08 to 0.11 kJ mol~(-1 )which is less than 8 kJ mol~(-1), this indicate a physisorption prcocess. Zeolite and organo-zeolite were used as adsorbents for the investigation of the kinetic studies using column reactor. Kinetic models, a pseudo-second-order, intraparticle diffusion and Elovich were used to analyze the results. The calculated q_(max) values using second-order model for both organo-zeolite and zeolite are (1.720-2.074) and (0.916-1.274) respectively, the values of q_(max) for organo-zeolite are higher than that of zeolite. The normalized standard deviation (%SSE) showed a good agreement between the experimental capacity and the calculated one at different temperature values for both zeolite and the organo-zeolite. The intraparticle diffusion model showed deviation from linearity when zeolite is used and showed one line when the adsorbent is organo-zeolite. The calculated activation energies (Ea) in kJ/mol for both zeolite and the organo-zeolite, are 90.7 and 13.7 respectively, the value of the activation energy gives us evidence that the organo-zeolite is better than the zeolite as an adsorbent because it has lower activation energy than the zeolite.
机译：在本研究中，约旦沸石用阳离子表面活性剂溴化十六烷基三甲基铵（HDTMA-Br）改性，该有机沸石用于去除硝酸根离子（氧阴离子）。使用沸石在不同参数下进行批处理实验;等温线平衡模型Langmiur，Freundlich，Dubinin-Radushkevich和Redlich-Peterson在25、30、35、40和45°C的不同温度值下进行了研究。 Redlich-Peterson，Freundlich和Dubinin-Radushkevich模型显示，实验均衡数据遵循这些模型的效果优于Langmuir模型。利用Dubinin-Radushkevich模型计算出的能量在0.08至0.11 kJ mol〜（-1）之间变化，小于8 kJ mol〜（-1），这表明存在物理吸附过程。沸石和有机沸石用作吸附剂，用于研究使用柱式反应器的动力学研究。动力学模型，伪二级，粒子内扩散和Elovich被用来分析结果。使用二阶模型计算得到的有机沸石和沸石的q_（max）值分别为（1.720-2.074）和（0.916-1.274），有机沸石的q_（max）值高于沸石。归一化的标准偏差（％SSE）显示出在沸石和有机沸石在不同温度下的实验容量和计算出的标准偏差之间的良好一致性。当使用沸石时，颗粒内扩散模型显示出与线性的偏差，而当吸附剂是有机沸石时，颗粒内扩散模型显示出一条线。计算出的沸石和有机沸石的活化能（Ea）以kJ / mol计分别为90.7和13.7，活化能的值为我们提供了证据，证明有机沸石比作为吸附剂的沸石更好。具有比沸石低的活化能。

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