State Environmental Protection Key Laboratory of Eco-Industry, Northeastern University, Shenyang 110819, China.
Department of Chemical Engineering, Maulana Azad National Institute of Technology, Bhopal 462003, Madhya Pradesh, India.
Sci Total Environ. 2021 Jan 20;753:142091. doi: 10.1016/j.scitotenv.2020.142091. Epub 2020 Sep 5.
This study was designed to prepare an adsorbent without any complex modification process for the removal of atrazine (AZN) from aqueous phase. Thus, Mobil composition of matter No. 41 (MCM-41) was synthesized and modified by physical activation at high temperature (650 °C). The synthesized adsorbent was tested by XRD, SEM, EDX, FT-IR and BET to confirm the successful synthesis as well as effectiveness for the adsorption of AZN. The average particle size of prepared material was found to be about 500 nm, while the BET calculations showed that adsorbent was porous with a specific surface area of 25.9 m/g. Later, it was used in batch removal studies of AZN for which, it showed a high adsorption capacity of 89.99 (mg/g). The pH of 6, temperature of 313 K was found to be the optimized conditions for the maximum removal of AZN. Of the four kinetic models studied, the pseudo-first-order yielded a superior fit in comparison with the other three models. The results indicated that the five linearized adsorption equilibrium isotherm models (Langmuir, Freundlich, Dubinin-Radushkevich, Temkin and Harkins-Jura models) closely correlate the AZN adsorption removal process with Pearson correlation coefficient (R) values of 0.9955, 0.8551, 0.8736, 0.8913 and 0.7253, respectively. The energy functions obtained by thermodynamic analysis suggested that the AZN sorption follows a non-spontaneous and endothermic path.
本研究旨在制备一种无需复杂修饰过程的吸附剂，用于从水相中去除莠去津（AZN）。因此，合成了 Mobil 组成物质号 41（MCM-41），并通过高温（650°C）物理活化进行了修饰。通过 XRD、SEM、EDX、FT-IR 和 BET 对合成的吸附剂进行了测试，以确认成功合成以及对 AZN 的吸附效果。制备材料的平均粒径约为 500nm，而 BET 计算表明，吸附剂具有多孔性，比表面积为 25.9m/g。随后，将其用于批处理去除 AZN 的研究，结果表明其具有 89.99(mg/g)的高吸附容量。在 pH 为 6、温度为 313K 的条件下，发现是 AZN 最大去除的优化条件。在所研究的四个动力学模型中，与其他三个模型相比，准一级模型具有更好的拟合度。结果表明，五种线性吸附平衡等温线模型（朗缪尔、弗伦德利希、杜比宁-拉德什科夫、特金和哈金斯-茹拉模型）与 Pearson 相关系数（R）值分别为 0.9955、0.8551、0.8736、0.8913 和 0.7253，紧密关联了 AZN 的吸附去除过程。热力学分析得到的能量函数表明，AZN 吸附遵循非自发和吸热途径。
