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In this work, the mixture of red mud slurry and inorganic salt ((NH4)2SO4) has been used as an electrolyte for electrochemical activation of graphite. The red mud-activated graphite composite was then used as an adsorbent for removing methylene blue from aqueous solution by the batch method. The effect of pH, contact time, adsorbent dosage, and the initial concentration of methylene blue was investigated. The optimal condition was found at pH 6, contact time 120 min, and amount of adsorbent 1 mg/L. The maximum adsorption capacity was found to be 89.28 mg/g based on the Langmuir isotherm equation, suggesting that the red mud-activated graphite composite is a very potential adsorbent for removing methylene blue and is also used in other coloured wastewater treatments.

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Heavy metal pollution in the soil environment is a worldwide environmental problem as it has negative effects on both human health and the environment. Remediation of heavy metal-contaminated soil is essential to improve soil quality, provide land resources for agricultural production, and protect human and animal health and the ecological environment. There is the possibility of remediating these contaminated soils through the use of several heavy metal absorbing plants and Superabsorbent polymers. Superabsorbent polymers (SAPs) are 3D polymer networks having hydrophilic nature, which can swell, absorb and hold a large amount of water or aqueous solutions in their network. This study evaluates the effect of superabsorbent polymer on Pb absorption capacity of Vetiver (Vetiveria zizanioides.L) that was grown on contaminated soil in Trai Cau iron ore dumpsite, Dong Hy district, Thai Nguyen province. The experiment was designed with five recipes and three replicates. The contents of SAP studied were 0, 0.6, 0.8, and 1.0 g/kg of soil. Uncontaminated soil was used as the control treatment. In the supplemented recipe of SAP, Vetiver showed better Pb treatment efficiency than the recipes without adding polymers. After 120 days of planting, SAP increased the tolerance and Pb absorption of Vetiver, improving soil properties. The best Pb treatment efficiency is achieved when using SAP with content from 0.8-1.0 g/kg soil.

In this study, we produce a red mud/graphene composite (REEG) via electrochemical activation graphite in basic red mud slurry. The adsorption properties for As(III) on REEG were investigated by batch method. The influence of pH (2-12), contact time (0-300 min), and the amount of adsorbent (0.02-0.1 g) on As(III) removal efficiency by the REEG were also determined. Results showed that the equilibrium time, the optimal pH, and mass of adsorbent were 240 min, pH 3.0 and 0.05 g, respectively. The maximum adsorption capacity (q max ) calculated by Langmuir isotherm model was found to be 21.367 mg/g. The results showed that REEG promises to be a good absorbent for As(III) removal from aqueous solution.

Bài báo này trình bày kết quả nghiên cứu chế tạo một bước vật liệu tổ hợp cấu trúc nano than trấu/Fe3O4 (RHF) bằng phương pháp đồng kết tủa có sự hỗ trợ của siêu âm ứng dụng hấp phụ xử lý kháng sinh Sulfamethoxazole (SMX) trong nước. Đặc trưng hình thái học bề mặt, tính chất từ và cấu trúc của vật liệu RHF được khảo sát bằng các phương pháp kính hiển vi điện tử quét, kính hiển vi điện tử truyền qua, từ độ bão hòa, nhiễu xạ tia X. Khả năng ứng dụng của RHF được thử nghiệm qua việc loại bỏ SMX trong nước sử dụng phương pháp hấp phụ. Các kết quả nhận được cho thấy tiềm năng sử dụng vật liệu RHF vào xử lý SMX cũng như các thuốc kháng sinh trong nước thải thực tế.