Demeclocycline Hydrochloride

Tetracycline antibiotics (TCs) poses a substantial threat to environmental and human health due to their persistence in aquatic environments.Development more efficient and reliable catalysts for TCs removal remains a significant challenge.In this study, an organic ligands modulation Ti-based metal-organic frameworks (MIL-125(Ti)@TCPP-300) was designed and applied for TCs degradation under visible light irradiationThe Tetrakis (4-Carboxyphenyl) porphyrin (TCPP) ligand was modified on the surface of mixed-ligand 1,4-dicarboxybenzene (BDC) and 2-amino terephthalic acid (BDC-NH₂) metal-organic frameworks (MOFs) by sequential growth.This was followed by the selective removal of ligands through pyrolysis.The surface modification with the TCPP ligand, in conjunction with the selective removal of the BDC-NH₂ ligand, resulted in a conjugated structure featuring electron-withdrawing groups and addnl. mesopores, which induces enhanced visible light absorption, separation of photoinduced electron-hole pairs, and reactant adsorption remove capabilities.The incorporation of a visible light-absorbing multifunctional ligand and mesopores has enhanced the removal efficiency of the MIL-125(Ti)@TCPP-300 composite, achieving up to a 92.18% removal rate for oxytetracycline (OTC) within one hour.This performance is 3.1 times greater than that of dual ligand metal-organic frameworks (MOFs).Using OTC as a representative compound, the mechanism of OTC photocatalytic degradation involves the generation of •O^-₂, ¹O₂, which initiate a series of hydroxylation, demethylation, and ring-opening processes through three distinct pathways.Furthermore, the proposed composites have demonstrated high removal rates for other contaminants with specific catalytic sites, such as chlorpyrifos (81.48%) and thiacloprid (77.06%).The proposed strategy highlights great potential on environment governance for multiple contaminants.