TiO2 embedded in AC-COFs/SiO2 composites with core-shell structure for improved photocatalytic degradation performance of tetracycline
Source abstract
Abstract
The excellent photocatalytic properties of covalent organic frameworks (COFs) and Titanium dioxide (TiO 2) have been a hot research topic. However, the extensive application of the COFs and TiO 2 in photocatalysis is restricted by their easy agglomeration and poor visible light usage, respectively. In this research, acyl chloride-covalent organic frameworks (AC-COFs) prepared by ultrasound assisted synthesis method was attached to the surface of silica oxides (SiO 2) prepared by the modified Stöber method with high specific surface area and high porosity through amino groups to form a core-shell structure, which effectively solved the problem of easy agglomeration of the AC-COFs. Subsequently, TiO 2 was loaded onto the surface of the AC-COFs@SiO 2 composites to create high-performing TiO 2/AC-COFs@SiO 2 composites with a wide visible light absorption range (λ=409 nm), a narrow band gap ( E g=2.32 eV) and strong adsorption performance ( Q m=314.47 mg/g). Compared with SiO 2, the adsorption performance of this composite material was improved by 1.5 times. Meanwhile, the formed binary heterogeneous structure effectively reduces carrier recombination rate and releases more active substances like h + and ·OH, so the catalyst has excellent self-cleaning and cyclic stability under the combined effect of adsorption and photocatalysis. It was found that tetracycline (TC) completely degrades after 50 min and the degradation rate decreasing by only 2.8 % after six cycles.
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Research context
OpenAlex topics: Covalent Organic Framework Applications · Advanced Photocatalysis Techniques · Metal-Organic Frameworks: Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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