Abstract Porous SiOC composites were prepared by varying the proportions of silicone resin and rice husk at different pyrolysis temperatures using biotemplate method. The as-prepared composites were investigated by various… Click to show full abstract
Abstract Porous SiOC composites were prepared by varying the proportions of silicone resin and rice husk at different pyrolysis temperatures using biotemplate method. The as-prepared composites were investigated by various analytical techniques and utilized for adsorption of ciprofloxacin from wastewater and as a catalyst support. The composites consist of the SiOC matrix, silicon dioxide and free carbon. The optimized composite has the hierarchical pores with high specific surface area of 767.61 m2/g and pore volume of 0.84 cm3/g. The adsorption process of ciprofloxacin onto SiOC composites adheres to the pseudo-second-order kinetic model. The external film diffusion and intra-particle diffusion jointly control the adsorption rate, and the Langmuir and Freundlich models can properly describe the adsorption isotherms. The SiOC samples show a large adsorption capacity (148.0 mg/g) and superior reusability, suggesting its exceptional reusability and potential application in antibiotic-containing wastewater treatment. Furthermore, the photodegradation rate constant of the SiOC/g-C3N4 composite is almost 2.28 times as high as that of pristine g-C3N4, indicating that the SiOC composites can be employed in a favorable catalyst support ascribed to the enhancement of photodegradation performance after loading photocatalyst on the SiOC adsorbent.
               
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