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Interlayer Modification of Montmorillonite and Laponite by Cr(III)/Al(III) Polyhydroxo Species: Adsorption and Photo-Assisted Oxidation of Dyes

Nozim MamataliyevDepartment of Colloid Chemistry and Industrial Ecology, Institute of General and Inorganic Chemistry, Academy of Sciences of Republic of Uzbekistan, Tashkent 100170, UzbekistanAziza AbdikamalovaDepartment of Chemical Engineering, Termez State University of Engineering and Agrotechnologies, Termez 190111, Surkhandarya Region, UzbekistanAlisher KalbaevDepartment of Colloid Chemistry and Industrial Ecology, Institute of General and Inorganic Chemistry, Academy of Sciences of Republic of Uzbekistan, Tashkent 100170, UzbekistanBahodirjon MamajonovDepartment of Chemistry, Kokand State University, Kokand 150700, UzbekistanSuhrob ErgashevDepartment of Machinery and Equipment of the Oil and Gas Industry and Pipeline Transport Systems, Faculty of Oil and Gas, Tashkent State Technical University, Tashkent 100095, UzbekistanIzzat EshmetovDepartment of Colloid Chemistry and Industrial Ecology, Institute of General and Inorganic Chemistry, Academy of Sciences of Republic of Uzbekistan, Tashkent 100170, UzbekistanDilshod KhaydarovDepartment of Colloid Chemistry and Industrial Ecology, Institute of General and Inorganic Chemistry, Academy of Sciences of Republic of Uzbekistan, Tashkent 100170, UzbekistanMirtokhir MuratovDepartment of Colloid Chemistry and Industrial Ecology, Institute of General and Inorganic Chemistry, Academy of Sciences of Republic of Uzbekistan, Tashkent 100170, UzbekistanBobirjon AdizovDepartment of Oil and Gas Chemistry, Institute of General and Inorganic Chemistry, Academy of Sciences of Republic of Uzbekistan, Tashkent 100170, UzbekistanMamatalieva SayyoraDepartment of Colloid Chemistry and Industrial Ecology, Institute of General and Inorganic Chemistry, Academy of Sciences of Republic of Uzbekistan, Tashkent 100170, UzbekistanBunyodjon MakhkamovDivision of Natural compounds and applied Chemistry, National University of Uzbekistan, Tashkent 100174, Uzbekistan

2026

Ochiq kirishOlmos

Litsenziya: cc-by-nc-nd

ABI

Annotatsiya

This study explores the structural modification of layered aluminosilicates through intercalation with Cr(III) and mixed Cr(III)/Al(III) polyhydroxo species. Despite the widespread use of modified clays, the integration of high-capacity adsorption with catalytic mineralization in a single inorganic matrix remains insufficiently addressed. Natural montmorillonite and synthetic laponite were used as host materials to evaluate their adsorption and photo-assisted oxidation performance. Structural and textural changes were investigated using XRD, N2 adsorption, SEM, FTIR, and mass titration. Intercalation significantly increased the BET surface area (up to 211.99 m2/g) and modified the surface charge, shifting the pHpzc of montmorillonite from 10.1 to 4.4. Adsorption experiments demonstrated a significant increase in capacity for the anionic dye Congo red, driven by the neutralization of layer charge and the creation of new binding environments. In addition, Cr-intercalated laponites showed catalytic activity in UV/H2O2-assisted oxidation, facilitated by a photo-Fenton-like pathway at interlayer-fixed Cr centers. The results demonstrate that controlled interlayer modification provides multifunctional sorption-reactive materials where efficient pollutant preconcentration is coupled with rapid oxidative degradation, offering a robust solution for wastewater treatment. HIGHLIGHTS Natural montmorillonite and synthetic laponite were intercalated with Cr(III) and Cr/Al polyhydroxo species. The modification considerably expanded the specific surface area (up to 211.99 m2/g) and shifted the surface charge. Intercalated materials demonstrated a dramatic increase in adsorption capacity for the anionic dye Congo red (up to ~400 mg/g). Interlayer-fixed Cr species acted as stable catalytic centers for rapid UV/H2O2 photo-assisted dye oxidation. These multifunctional sorption-reactive materials offer a robust, integrated solution for industrial wastewater treatment. GRAPHICAL ABSTRACT

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Identifikatorlar

DOI: 10.48048/tis.2026.13763

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