The most important effect of natural organic materials in water is reacting with disinfectants and creating disinfectant by-products that are mostly carcinogenic. The aim of this study was to determine the optimum conditions for removal of humic acid (HA) by zeolite coated with nZVI nanoparticles (Zeolite/nZVI) from aqueous solutions. In this study, after synthesis of zeolite/nZVI, its structure and morphology were examined using FTIR, BET, XRF, and FESEM techniques. The effects of HA concentration, composite content, pH, and reaction time were evaluated. The experimental data were analyzed by Langmuir and Freundlich isotherm and pseudo-first-order and second-order kinetic models. Finally, the thermodynamic parameters of enthalpy (ΔΗ°), entropy (ΔS°), and Gibbs free energy (ΔG°) were calculated. The results of the analyses confirmed the accuracy of the composite structure. Its specific surface area by using BET method was 203.43 m²/g. The HA removal efficiency was obtained at 92.98% in optimum conditions of 50 mg/L concentration, 2 g/L composite dose, pH = 3, and reaction time of 60 min. The results of the isotherm and kinetic study showed that the HA adsorption process follows the Langmuir isotherm (R² = 0.9707) and pseudo-second-order kinetic. The maximum adsorption capacity of the composite was determined at 23.36 mg/g by Langmuir model. Thermodynamic parameters indicate that the adsorption of HA endothermic and the reaction cannot be done spontaneously. Zeolite/nZVI composite had good removal efficiency after five times of recycling. The present study showed that zeolite/nZVI can be used as an effective adsorbent for removal of HA from aqueous solutions.

天然有机物质在水中的最重要作用是与消毒剂反应，并产生主要致癌的消毒剂副产物。这项研究的目的是确定从水溶液中涂覆nZVI纳米颗粒（沸石/ nZVI）的沸石去除腐殖酸（HA）的最佳条件。在这项研究中，合成沸石/ nZVI后，使用FTIR，BET，XRF和FESEM技术检查了其结构和形态。评估了HA浓度，复合物含量，pH和反应时间的影响。实验数据通过Langmuir和Freundlich等温线以及伪一级和二级动力学模型进行分析。最后，给出了焓（ΔΗ °），熵（ΔS °）和吉布斯自由能（ΔG °）进行计算。分析结果证实了复合结构的准确性。通过BET法测定的比表面积为203.43m ² / g。在50 mg / L浓度，2 g / L复合剂量，pH = 3和60分钟反应时间的最佳条件下，HA去除效率达到92.98％。等温线和动力学研究结果表明，HA吸附过程遵循Langmuir等温线（R ² = 0.9707）和伪二级动力学。该复合材料的最大吸附容量通过Langmuir模型确定为23.36mg / g。热力学参数表明HA吸热的吸附和反应不能自发进行。经过五次循环后，沸石/ nZVI复合材料具有良好的去除效率。本研究表明，沸石/ nZVI可以用作从水溶液中去除HA的有效吸附剂。