Research Laboratory of Nanoporous Materials, Faculty of Chemistry, Iran University of Science and Technology, Farjam Street, Narmak, P.O. Box 16846-13114, Tehran, Iran.
Health, Safety and Environment Department, Petropars Company, Farhang Blvd, Saadat-Abad, P.O. Box 19977-43881, Tehran, Iran.
Int J Biol Macromol. 2022 May 31;208:794-808. doi: 10.1016/j.ijbiomac.2022.03.161. Epub 2022 Mar 31.
In this work removal of the arsenic (As) spiked in water through adsorption using synthesized nanocomposites as a adsorbent. The Zn-BDC@chitosan/carbon nanotube (Zn-BDC@CT/CNT) and Zn-BDC@chitosan/graphene oxide (Zn-BDC@CT/GO) were synthesized from metal organic framework, carbon nanotube/graphene oxide and natural polysaccharide. Results of adsorption experiments showed that the Zn-BDC@CT/GO possessed a higher adsorption capacity than that of the Zn-BDC@CT/CNT. A study on the adsorption of As onto Zn-BDC@CT/GO was conducted and the process parameters were optimized by response surface methodology (RSM). A five-level, four-factor central composite design (CCD) has been used to determine the effect of various process parameters on As uptake from aqueous solution. By using this design a total of 20 adsorption experimental data were fitted. The regression analysis showed good fit of the experimental data to the second-order polynomial model with coefficient of determination (R) value of 0.9997 and model F-value of 1099.97. The adsorption matched with the pseudo-second-order model and the Freundlich model. The thermodynamic parameters revealed that the nature of adsorption was feasible, spontaneous and endothermic process. Adsorption of As in the presence of other competitive ions was not significantly affected The effective adsorption performance also sustained even after ten adsorption-desorption cycles, indicating favorable reusability.
在这项工作中，通过使用合成纳米复合材料作为吸附剂的吸附作用，去除水中的砷（As）。Zn-BDC@壳聚糖/碳纳米管（Zn-BDC@CT/CNT）和 Zn-BDC@壳聚糖/氧化石墨烯（Zn-BDC@CT/GO）是由金属有机骨架、碳纳米管/氧化石墨烯和天然多糖合成的。吸附实验结果表明，Zn-BDC@CT/GO 具有比 Zn-BDC@CT/CNT 更高的吸附容量。对 Zn-BDC@CT/GO 对 As 的吸附进行了研究，并通过响应面法（RSM）对吸附过程参数进行了优化。采用五水平四因素中心组合设计（CCD）来确定各种过程参数对水溶液中 As 去除的影响。通过使用该设计，共拟合了 20 个吸附实验数据。回归分析表明，实验数据与二次多项式模型拟合良好，决定系数（R）值为 0.9997，模型 F 值为 1099.97。吸附符合准二级模型和 Freundlich 模型。热力学参数表明，吸附的本质是可行的、自发的和吸热过程。在存在其他竞争离子的情况下，对 As 的吸附没有受到显著影响，即使经过十次吸附-解吸循环，有效的吸附性能仍然得以维持，表明其具有良好的可重复使用性。
