Kinetic, Isotherm, and Thermodynamic Modeling of Pb(II) Heavy Metals Removal from Aqueous Solutions Using Hydrogel-MWCNTs Nanocomposites

IF 0.4 Q4 ENVIRONMENTAL SCIENCES

Asian Journal of Water, Environment and Pollution Pub Date : 2023-11-27 DOI:10.3233/ajw230081

Zainab R. Maktof, Nadher D Radia

引用次数: 0

Abstract

This study investigated the ability of nanocomposite hydrogels (NaCMC-g-AAc/COOH-MWCNTs) to adsorb Pb(II) ions, an environmental pollutant. The characterisation of the hydrogel and nanocomposite was achieved using FTIR, FESEM, XRD and TGA techniques, XRD techniques. Adsorption studies showed that equilibrium was reached after 120 minutes with a removal efficiency of 82%. Many factors were also studied, as the results indicated that the adsorption equality was of the (S4) type according to Giles’ classification, and the adsorption parallels for Pb (II) ions matched the Freundlich adsorption model. The absorption process was found to be endothermic, with absorption increasing with increasing temperature. Positive content and entropy are noted, as well as negative free energy, indicating the physical and spontaneous nature of the process.

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使用水凝胶-MWCNTs 纳米复合材料去除水溶液中铅（II）重金属的动力学、等温线和热力学模型

本研究探讨了纳米复合水凝胶（NaCMC-g-AAc/COOH-MWCNTs）吸附环境污染物铅（II）离子的能力。利用傅立叶变换红外光谱（FTIR）、有限元电子显微镜（FESEM）、X 射线衍射（XRD）和热重分析（TGA）技术、X 射线衍射（XRD）技术对水凝胶和纳米复合材料进行了表征。吸附研究表明，120 分钟后达到平衡，去除率为 82%。此外，还对许多因素进行了研究，结果表明，根据 Giles 的分类，吸附平等属于（S4）类型，对铅（II）离子的吸附平行符合 Freundlich 吸附模型。吸附过程是内热的，吸附量随温度升高而增加。吸附量和熵均为正值，自由能也为负值，这表明吸附过程具有物理和自发性质。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Asian Journal of Water, Environment and Pollution ENVIRONMENTAL SCIENCES-

CiteScore

1.00

自引率

20.00%

发文量

期刊介绍： Asia, as a whole region, faces severe stress on water availability, primarily due to high population density. Many regions of the continent face severe problems of water pollution on local as well as regional scale and these have to be tackled with a pan-Asian approach. However, the available literature on the subject is generally based on research done in Europe and North America. Therefore, there is an urgent and strong need for an Asian journal with its focus on the region and wherein the region specific problems are addressed in an intelligent manner. In Asia, besides water, there are several other issues related to environment, such as; global warming and its impact; intense land/use and shifting pattern of agriculture; issues related to fertilizer applications and pesticide residues in soil and water; and solid and liquid waste management particularly in industrial and urban areas. Asia is also a region with intense mining activities whereby serious environmental problems related to land/use, loss of top soil, water pollution and acid mine drainage are faced by various communities. Essentially, Asians are confronted with environmental problems on many fronts. Many pressing issues in the region interlink various aspects of environmental problems faced by population in this densely habited region in the world. Pollution is one such serious issue for many countries since there are many transnational water bodies that spread the pollutants across the entire region. Water, environment and pollution together constitute a three axial problem that all concerned people in the region would like to focus on.