Abstract Solid wastes exhibit excellent prospects in the removal of heavy metals from contaminated water. However, raw solid waste materials usually show mediocre uptake efficiency, it is imperative to functionalize or transform them into new solid waste-based materials. The present work provides a novel technique by utilization of silica fume waste for Ni2+ removal from wastewater. The sorbent was prepared by in-suit conversion of amorphous silica fume based geopolymer into monolithic ZSM-5 via polycondensation and seed-induced hydrothermal treatment process. The adsorption behavior of Ni2+ in aqueous solution onto the as-synthesized monolithic ZSM-5 was investigated. The adsorption experiment data fitted well with the pseudo-second-order kinetic model and Langmuir isotherm model. Thermodynamic parameters including ΔH, ΔG and ΔS were calculated from the temperature-dependent sorption isotherms. All the results confirmed that the sorption of Ni2+ onto monolithic ZSM-5 was a spontaneously endothermic chemisorption process, demonstrating the removal of Ni2+ from wastewater using monolithic ZSM-5 was feasible. The adsorption capacity of Ni2+ onto monolithic ZSM-5 was 13.22 mg/g at 25 °C, which was a competitive result compared with similar adsorbents and commercial ZSM-5 powders.

中文翻译：

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ZSM-5 整料作为去除 Ni2+ 的固体吸附剂的表征

摘要 固体废物在去除受污染水体中的重金属方面表现出良好的前景。然而，原始固体废物材料通常表现出平庸的吸收效率，必须对其进行功能化或转化为新的固体废物材料。目前的工作提供了一种利用硅粉废物从废水中去除 Ni2+ 的新技术。该吸附剂是通过缩聚和种子诱导水热处理过程将无定形硅粉基地质聚合物适当转化为整体 ZSM-5 制备的。研究了水溶液中 Ni2+ 在合成的整体 ZSM-5 上的吸附行为。吸附实验数据与拟二级动力学模型和朗缪尔等温线模型拟合良好。热力学参数包括 ΔH，ΔG 和 ΔS 由温度相关的吸附等温线计算。所有结果证实 Ni2+ 在整体 ZSM-5 上的吸附是一个自发吸热化学吸附过程，表明使用整体 ZSM-5 从废水中去除 Ni2+ 是可行的。Ni2+ 在整体 ZSM-5 上的吸附容量在 25 °C 时为 13.22 mg/g，与类似的吸附剂和商业 ZSM-5 粉末相比，这是一个具有竞争力的结果。