ТҮРЛЕНДІРІЛГЕН САЗДЫҢ КӨМЕГІМЕН МЕТИЛЕН КӨГІН АДСОРБЦИЯЛАУ ЖӘНЕ ПЕРОКСИДТІ КАТАЛИТИКАЛЫҚ ТОЛЫҚТЫРУ ҮРДІСІН ЗЕРТТЕУ

Abstract

In this study, natural kaolinite clay modified with dimethyl sulfoxide (DMSO) and triethanolamine (TEOA) was investigated for methylene blue adsorption and its removal via the catalytic wet peroxide oxidation (CWPO) process. The aim of the work was to develop an efficient and low-cost catalyst based on natural clay materials. Natural clay from the Shymkent deposit was modified using a two-step intercalation method. The structural and phase compositions of the raw and modified clays were characterized by X-ray diffraction (XRD). The catalytic performance was evaluated at an initial methylene blue concentration of 50 mg/L, pH = 3, temperature of 50°C, and in the presence of hydrogen peroxide. The results demonstrated that TEOA-modified clays exhibit significantly enhanced catalytic activity. The Shymkent-TEOA catalyst achieved complete degradation of methylene blue within 8 hours. This improvement is attributed to the increased number of surface functional groups and enhanced pore accessibility after TEOA intercalation, which promotes the generation of reactive oxygen species from hydrogen peroxide. The obtained materials show great potential as efficient, environmentally friendly, and cost-effective catalysts for wastewater treatment contaminated with dyes.