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首页> 外文期刊>Transactions of The Institution of Chemical Engineers. Process Safety and Environmental Protection, Part B >Removal of atrazine as an organic micro-pollutant from aqueous solutions: a comparative study
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Removal of atrazine as an organic micro-pollutant from aqueous solutions: a comparative study

机译：从水溶液中去除阿特拉津作为有机微污染物的比较研究

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In the present study, different adsorbents were prepared: activated carbon (AC), MgO and ZnO nanoparticles, and the composite of AC/MgO/ZnO. The AC was prepared from oak charcoals, as low-cost and abundantly available materials in Iran, by chemical activation. MgO and ZnO nanoparticles were synthesized using a sol gel method. The adsorbents were characterized using Powder X-ray diffraction (XRD), Field Emission-Scanning Electron Microscope (FESEM), and Energy Dispersive X-ray Spectroscopy (EDS). Then, the adsorption behavior of the adsorbents was tested for the removal of atrazine (ATZ) herbicide as a model of organic micro-pollutant. The average crystallite size of MgO and ZnO nanoparticles was calculated from their XRD data using the Scherrer equation. The results showed that the MgO and ZnO nanoparticles had a size in nano scale, which was supported by FESEM images. The experimental data showed that the pH of solution had no considerable effect on the adsorption of ATZ herbicide. The experimental data obtained for the AC and AC/MgO/ZnO composite were fitted to nonlinear pseudo first-order, pseudo-second order, and general order kinetic models. The general order kinetic model provided the best fit to experimental data compared with the other models. The adsorption isotherm data of these two adsorbents at different temperatures fitted well to the Langmuir and Liu models, but followed the Liu isotherm model most precisely, based on the lowest SD value provided by this model. The results of this study indicate that the chemically prepared AC has excellent adsorptive capacity and can be used as an effective adsorbent for the removal of ATZ from aqueous solutions. However, MgO and ZnO nanoparticles exhibited low adsorptive capacity for ATZ and could not be suitable adsorbents for the removal of this pollutant. (C) 2016 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
机译：在本研究中，制备了不同的吸附剂：活性炭（AC），MgO和ZnO纳米颗粒以及AC / MgO / ZnO的复合材料。 AC是通过橡木炭通过化学活化而制成的，是伊朗低成本和大量可得的材料。使用溶胶凝胶法合成了MgO和ZnO纳米粒子。使用粉末X射线衍射（XRD），场发射扫描电子显微镜（FESEM）和能量分散X射线光谱（EDS）对吸附剂进行表征。然后，测试了吸附剂的吸附行为，以去除作为有机微污染物模型的at去津（ATZ）除草剂。 MgO和ZnO纳米粒子的平均微晶尺寸是使用Scherrer方程从XRD数据计算得出的。结果表明，MgO和ZnO纳米粒子具有纳米级尺寸，这由FESEM图像支持。实验数据表明，溶液的pH值对ATZ除草剂的吸附影响不大。将AC和AC / MgO / ZnO复合材料获得的实验数据拟合到非线性拟一阶，拟二阶和一般动力学模型。与其他模型相比，通用动力学模型最适合实验数据。这两种吸附剂在不同温度下的吸附等温线数据非常适合Langmuir和Liu模型，但基于该模型提供的最低SD值，最精确地遵循了Liu等温线模型。这项研究的结果表明，化学制备的AC具有出色的吸附能力，可以用作从水溶液中去除ATZ的有效吸附剂。但是，MgO和ZnO纳米颗粒对ATZ的吸附能力很低，因此不能作为去除这种污染物的合适吸附剂。 （C）2016年化学工程师学会。由Elsevier B.V.发布。保留所有权利。

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