Synthesis of BiOF/Bi2O3/CaWO4 composites for efficient adsorption and selective separation of dyes
摘要
To effectively remove and recycle organic dyes from wastewater, this study addresses the issues of poor selectivity and difficulty in recycling traditional adsorbents in practical applications. A novel anionic heterostructured composite material, BiOF/Bi2O3/CaWO4, was successfully prepared using a controllable co-precipitation-solvothermal method. By systematically optimizing three key parameters: the molar ratio of CaWO4, adsorption contact time, and the type of surfactant, the composition, morphology, and adsorption performance of the material were regulated. Under the optimized conditions (CaWO4 molar fraction of 85% and surfactant of sodium dodecylbenzene sulfonate), the obtained composite material demonstrated excellent adsorption performance for methylene blue (MB) with an initial concentration of 10 mg/L, achieving rapid adsorption within 5 min and a removal rate of 98.03% at 10 min. After five cycles of use, the removal efficiency remained at 93%. In a mixed system with coexisting anionic and cationic dyes, the composite material exhibited significant selective adsorption capacity for the cationic dye MB, and the adsorbed MB could be efficiently desorbed under mild conditions, enabling the regeneration of the adsorbent and the resource recovery of MB. This study provides a preparation approach for efficient adsorbents for dye wastewater treatment and offers practical references for the rational design of composite functional materials and the selective adsorption and resource recovery of organic pollutants in complex water bodies.