Management of trihalomethanes in water by ZnO@kaolinite composite: integrated experimental and modeling studies.

IF 2.5 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Journal of water and health Pub Date : 2024-09-01 Epub Date: 2024-09-10 DOI:10.2166/wh.2024.250
Enas Ezzat, El-Sayed I Mishaqa, O A Mohamed, Nabila Shehata
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Abstract

The adsorption of trihalomethanes (THMs) from drinking water was investigated in the current study through comparison studies of kaolinite and ZnO@kaolinite nanocomposites. The clay structural network's successful immobilization on the zincite hexagonal structure of ZnO nanoparticles' lattice layers was verified by the SEM/EDX analysis. Under the optimum conditions, the maximum removal of THMs was achieved by kaolinite and ZnO@kaolinite nanocomposites after 60 min. The adsorption performance of the ZnO@kaolinite nanocomposites was greater than that of kaolinite because the former had a larger surface area than the latter. The Freundlich isotherm model best matched the adsorption experimental data, which also reveals the existence of multilayer adsorption on a diverse surface with the greatest correlation (R2 = 0.956 and 0.954, respectively) for both nanoadsorbents using the pseudo-first-order (PFO), pseudo-second-order (PSO), mixed 1, 2-order (MFSO), and intraparticle diffusion (IPD) models. The mechanism by which THMs in drinking water adsorb onto nanoadsorbents was examined. This revealed that both intraparticle and film diffusion were involved in the adsorption process. Kaolinite and ZnO@kaolinite nanocomposites can be used in water treatment to remove THMs due to their great recyclable and reusable properties, even after six cycles.

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ZnO@kaolinite 复合材料对水中三卤甲烷的管理:综合实验与模型研究。
本研究通过对高岭石和 ZnO@kaolinite 纳米复合材料的对比研究,探讨了饮用水中三卤甲烷(THMs)的吸附问题。通过 SEM/EDX 分析验证了粘土结构网络成功固定在 ZnO 纳米粒子晶格层的锌矿六方结构上。在最佳条件下,高岭石和 ZnO@kaolinite 纳米复合材料在 60 分钟后对三卤甲烷的去除率达到最大值。ZnO@kaolinite 纳米复合材料的吸附性能高于高岭石,因为前者的比表面积大于后者。利用伪一阶(PFO)、伪二阶(PSO)、混合一阶、二阶(MFSO)和颗粒内扩散(IPD)模型,两种纳米吸附剂的相关性最大(R2 分别为 0.956 和 0.954)。研究了饮用水中的三卤甲烷在纳米吸附剂上的吸附机理。结果表明,颗粒内扩散和薄膜扩散都参与了吸附过程。由于高岭石和 ZnO@kaolinite 纳米复合材料具有很好的可回收和可重复使用的特性,即使经过六次循环,它们仍可用于水处理以去除三卤甲烷。
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来源期刊
Journal of water and health
Journal of water and health 环境科学-环境科学
CiteScore
3.60
自引率
8.70%
发文量
110
审稿时长
18-36 weeks
期刊介绍: Journal of Water and Health is a peer-reviewed journal devoted to the dissemination of information on the health implications and control of waterborne microorganisms and chemical substances in the broadest sense for developing and developed countries worldwide. This is to include microbial toxins, chemical quality and the aesthetic qualities of water.
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