Cyclodextrin@TiO2 Preparation of Bidirectional Composites for TCH Removal by Photocatalytic Synergistic Adsorption

Photocatalytic degradation combined with adsorption removal of contaminants is one of the most effective methods of removing TCH P-(CM-β-CD/HPCS/KHA)@AC/TiO 2 composite material was prepared by etheration modification of β-Cyclodextrin (β-CD) and combination of activated carbon (AC) and TiO 2, the adsorption/photocatalytic degradation behavior of tetracycline hydrochloride (TCH) was studied, the P-(CM-β-CD/HPCS/KHA)@AC/TiO 2 composites were successfully prepared by FTIR, SEM, XRD and XPS Characterisation tests. At 298 K and pH 4, the removal rate of TCH can reach 98% in 2 h. The adsorption of the composites follows the quasi-second-order kinetic model, which is highly consistent with the Langmuir model, an endothermic and spontaneous adsorption process is formed through intermolecular forces and coordination. Photocatalytic degradation follows the quasi-first order model, the photocatalytic performance was verified in conjunction with TOC testing, and the process was known to be a detoxification process through toxicity testing. Finally, after 10 cycles of treatment, the composite material removed up to 70% of TCH.