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利用偏高岭土和明矾工业产生的硅质废料制备用于去除某些重金属的地质聚合物吸附剂。

Utilizing metakaolin and siliceous waste from the alum industry to create geopolymer adsorbent for the removal of certain heavy metals.

作者信息

Elewa Khaled, Tawfic A F, Tarek Mostafa, Al-Sagheer Nabil Abdullah, Nagy Nabil M

机构信息

Civil Engineering Department, Military Technical College, Cairo, Egypt.

Head of Nuclear Engineering Department, Military Technical College, Cairo, Egypt.

出版信息

Sci Rep. 2025 Jul 28;15(1):27484. doi: 10.1038/s41598-025-10800-w.

DOI:10.1038/s41598-025-10800-w
PMID:40721604
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12304128/
Abstract

A geopolymer (GP) from Partially Dealuminated Kaolin (PDK) was synthesized. PDK is a solid waste of alum industry, it was produced in a big quantity, which need careful management to be recycled for protection of the environment against pollution. Utilization of PDK is very lacking, and there were no studies for using in the preparation of geopolymer as an adsorbent for heavy metal removal from wastewater. GP was used for the removal of Cr, Cd, and Pb from synthetic industrial wastewater by the adsorption technique. FTIR spectrum indicates a peak at 977 cm due to Si-O-Si and Si-O-Al bonds confirming the formation of geopolymer. The effects of various parameters such as temperature, pH, contact time, and metal ion concentration were tested to stand over the most favorable conditions for adsorption. A total of 100% removal was achieved at a pH = 6.0, temperature = 25 °C, and initial concentration = 40 mg/L for a contact time of 60 min using a dosage of 0.2 g/L. The adsorption data validated Freundlich adsorption model. The values of Freundlich constant value, R were greater than 0.99 indicating the adsorption of metal ions onto the geopolymer to be highly favorable. High adsorption capacity has been achieved for Pb, Cd, and Cr (105.6 mg/g for Pb, 150 mg/g for Cd, 125 mg/g for Cr). The adsorption process followed pseudo-1st-order kinetics yielding high correlation coefficient and the adsorbed amount at equilibrium. More than 95% of adsorption was achieved at room temperature supports the effectiveness of metal ions adsorption on the geopolymer. This work helps for the reuse of the industrial waste of alum industry through the synthesis of a geopolymeric adsorbent, which can be applied successfully for removal of the Pb, Cd, and Cr ions from the polluted water.

摘要

合成了一种由部分脱铝高岭土（PDK）制备的地质聚合物（GP）。PDK是铝工业的固体废物，产量巨大，需要谨慎管理以实现回收利用，从而保护环境免受污染。目前对PDK的利用非常少，也没有关于将其用于制备地质聚合物以作为吸附剂去除废水中重金属的研究。通过吸附技术，使用GP去除合成工业废水中的铬、镉和铅。傅里叶变换红外光谱（FTIR）显示在977 cm处有一个峰，归因于Si-O-Si和Si-O-Al键，证实了地质聚合物的形成。测试了温度、pH值、接触时间和金属离子浓度等各种参数的影响，以确定最有利于吸附的条件。在pH = 6.0、温度 = 25°C、初始浓度 = 40 mg/L且接触时间为60分钟、投加量为0.2 g/L的条件下，实现了100%的去除率。吸附数据验证了弗伦德利希吸附模型。弗伦德利希常数R的值大于0.99，表明金属离子在地质聚合物上的吸附非常有利。对铅、镉和铬实现了高吸附容量（铅为105.6 mg/g，镉为150 mg/g，铬为125 mg/g）。吸附过程遵循准一级动力学，具有较高的相关系数和平衡吸附量。在室温下实现了超过95%的吸附，这支持了金属离子在地质聚合物上吸附的有效性。这项工作有助于通过合成地质聚合物吸附剂来实现铝工业工业废物的再利用，该吸附剂可成功应用于去除污水中的铅、镉和铬离子。

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