Abstract This work explored the potential of clinoptilolite, molybdenum sulphide (MoS2), and MoS2-clinoptilolite composite in lead (Pb) removal from aqueous medium and industrial mining wastewater. MoS2-clinoptilolite composite was successfully prepared by a hydrothermal method. The surface properties, structure, and composition of the synthesized composite and the parent compounds were analyzed by scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy. The removal efficiency of lead from aqueous solution was studied in batch-mode experiments. The MoS2-clinoptilolite was used for the removal of Pb ions (50 mg/L) from an aqueous solution: ~100% of the Pb was removed with a MoS2-clinoptilolite dose of 0.075 g, pH 6 at 328K within 90 min. The adsorption capacities of Pb onto MoS2-clinoptilolite were found to be higher than those onto clinoptilolite. Metal ion adsorption behavior was well explained by the Freundlich model, that is, multilayer adsorption of Pb molecules occurred on the heterogeneous surface of adsorbents in case of clinoptilolite, while in the case of MoS2-clinoptilolite, the Langmuir model was suitable, that is, the adsorption occurred on a monolayer surface. The rate of Pb adsorption was explained by pseudo-second-order model suggesting that the adsorption process is presumably chemisorption. Thermodynamic parameters such as ΔH°, ΔS°, and ΔG° were calculated, which indicated that the adsorption was spontaneous and exothermic in nature. The selectivity of each adsorbent for Pb was also tested by adding the adsorbents to real gold mine water which contains competitive metal ions.

中文翻译：

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矿山废水中铅离子吸附在二硫化钼-斜发沸石复合材料上的平衡、动力学和热力学研究

摘要 本工作探讨了斜发沸石、硫化钼 (MoS2) 和 MoS2-斜发沸石复合材料在去除水性介质和工业采矿废水中的铅 (Pb) 方面的潜力。采用水热法成功制备了MoS2-斜发沸石复合材料。通过扫描电子显微镜、X 射线衍射、能量色散 X 射线光谱和傅里叶变换红外光谱分析合成的复合材料和母体化合物的表面性质、结构和组成。在分批模式实验中研究了从水溶液中去除铅的效率。MoS2-斜发沸石用于从水溶液中去除 Pb 离子 (50 mg/L)：约 100% 的 Pb 用 0.075 g、pH 6、328K 的 MoS2-斜发沸石在 90 分钟内去除。发现 Pb 在 MoS2-斜发沸石上的吸附能力高于在斜发沸石上的吸附能力。Freundlich模型很好地解释了金属离子的吸附行为，即斜发沸石在吸附剂的异质表面发生Pb分子的多层吸附，而在MoS2-斜发沸石的情况下，Langmuir模型适用，即，吸附发生在单层表面。Pb 吸附的速率由伪二级模型解释，表明吸附过程可能是化学吸附。计算了ΔH°、ΔS°和ΔG°等热力学参数，表明吸附是自发放热的。