Porous metakaolin-based geopolymers for adsorption of Contaminants of Emerging Concern from wastewaters

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2024-07-31 DOI:10.1016/j.clay.2024.107502

Serena C. Tarantino , Roberta Occhipinti , Federica Maraschi , Michele Zema , M. Pia Riccardi , Antonella Profumo , Michela Sturini

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Abstract

This research investigates the applicability of metakaolin-based geopolymers in the removal of organic contaminants of emerging concern from polluted water by adsorption. Ofloxacin and cortisone were chosen as model molecules, because of their different chemical properties. For each contaminant, adsorption was first tested on powdered materials with different mesoporosity. The removal of the two drugs was eventually evaluated on macroporous geopolymer monoliths, obtained using commercial olive oil and H₂O₂ solution as pore-forming agents to enhance permeability to liquids and thus favor the absorption process. Finally, a novel ceramic composite diaphragm was prepared and tested. Adsorption experiments demonstrated the larger affinity of all substrates for ofloxacin than for cortisone. Different adsorption mechanisms were observed, monolayer for the antibiotic and cooperative for the steroid, with different adsorption capacities, 29(2) mg g⁻¹ and 0.47(2) mg g⁻¹, respectively. The removal efficiencies of the two drugs by the monoliths and by the ceramic composite diaphragm were evaluated and compared. Satisfactory drug recoveries (>99%) were also obtained under realistic conditions, i.e., freshwater, micrograms per liter drug concentration.

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多孔偏高岭土基土工聚合物用于吸附废水中的新关注污染物

本研究探讨了偏高岭土基土工聚合物通过吸附去除污染水体中新出现的有机污染物的适用性。由于氧氟沙星和可的松的化学性质不同，因此选择它们作为模型分子。对于每种污染物，首先在不同介孔率的粉末材料上进行吸附测试。最后，在大孔土工聚合物单片上对这两种药物的去除情况进行了评估，这些单片是用商用橄榄油和 H2O2 溶液作为孔隙形成剂获得的，目的是提高液体的渗透性，从而有利于吸收过程。最后，制备并测试了一种新型陶瓷复合隔膜。吸附实验表明，所有基质对氧氟沙星的亲和力都大于对可的松的亲和力。观察到了不同的吸附机制：抗生素为单层吸附，类固醇为合作吸附，吸附容量也不同，分别为 29(2) 毫克 g-1 和 0.47(2) 毫克 g-1。评估并比较了单层和陶瓷复合隔膜对两种药物的去除率。在现实条件下，即淡水、微克/升药物浓度条件下，也获得了令人满意的药物回收率（99%）。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...