Porous Clay Heterostructures in Aqueous Adsorption Applications

Porous clay heterostructures are advanced hybrid materials formed by the intercalation of inorganic or organo‐silica species between the layers of natural clays, yielding a stable mesoporous network with high specific surface area and tunable acidity. The layered aluminosilicate framework provides mechanical robustness, while introduced silica or metal oxides generate pore channels in the 2–50 nm range. Such structures combine the ion-exchange capacity and surface functionality of clays with the controlled porosity of synthetic silicas. In aqueous environments they have been demonstrated as efficient adsorbents for organic dyes, heavy metals and emerging contaminants. Surface modification with aluminium or zirconium species further enhances adsorption capacity by increasing Lewis acidity, improving affinity for anionic and cationic solutes. Their regeneration potential, low cost and abundance of raw materials underpin global efforts to deploy these materials in wastewater treatment, industrial effluent remediation and drinking‐water purification.

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Technical terms

Porous clay heterostructure: A composite material obtained by inserting inorganic or organosilica pillars between clay layers to create a stable mesoporous framework.

Pillared clay: A clay modified by permanent inorganic polyoxocation “pillars” that prop open the interlayer spacing, forming microporous channels.

Langmuir isotherm: A model describing monolayer adsorption onto a homogeneous surface with finite adsorption sites.

Regeneration: The process of restoring adsorbent capacity by desorbing contaminants, often through chemical treatment or pH changes.

Mesoporosity: The presence of pores with diameters between 2 and 50 nm, facilitating rapid mass transport in adsorption processes.

References

1. Al and Zr Porous Clay Heterostructures as Removal Agents of Basic Blue-41 Dye from an Artificially Polluted Solution: Regeneration Properties and Batch Design. Materials (2021).
2. Enhancement Properties of Zr Modified Porous Clay Heterostructures for Adsorption of Basic-Blue 41 Dye: Equilibrium, Regeneration, and Single Batch Design Adsorber. Materials (2022).
3. Regeneration and Single Stage Batch Adsorber Design for Efficient Basic Blue-41 Dye Removal by Porous Clay Heterostructures Prepared from Al13 Montmorillonite and Pillared Derivatives. Materials (2024).