Dynamic control of pentachlorophenol photodegradation process using P25/PDA/BiOBr through regulation of photo-induced active substances and chemiluminescence

Photoinduced Chemiluminescence Determination of Prednisolone Using Lucigenin-Cobalt 5,10,15,20-Tetra(4-Pyridyl)-21H,23H-Porphine System

Sensitive and precise assay of prednisolone, a steroid hormone, has received great attention due to its significant role in the treatment of a series of diseases. In this study, we have developed a simple, quick, and accurate technique in this part to measure prednisolone. Cobalt 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphine (CoTPyP) as a mimic peroxidase catalyzes the chemiluminescence (CL) reaction of lucigenin for the first time. CoTPyP has a great impact on the CL signal. Furthermore, the CL system has been successfully used for the prednisolone flow-injection test. The findings showed that the UV irradiation of prednisolone led to an unimolecular photochemical reaction that could enhance yield of high-energy intermediate and cause higher CL emission. Under ideal experimental circumstances, CL intensity was shown to be proportionate to prednisolone concentration in the range of 0.1-170 μg mL-1 (r = 0.9925, n = 4). A detection limit of 0.072 μg mL-1 was observed. Compared with the HPLC approach, our proposed method provides a sensitive, fast, and efficient analysis of prednisolone in pharmaceutical formulations and biological fluids.

Preparation of TiO2/Fe-MOF n‒n heterojunction photocatalysts for visible-light degradation of tetracycline hydrochloride

Visible-light-assisted photocatalysis has been recognized as an effective solution to the degradation of various pollutants including antibiotics, pesticides, herbicides, microplastics, and organic dyes. Herein, an n-n heterojunction TiO₂/Fe-MOF photocatalyst is reported, designed via hydrothermal synthesis route. TiO₂/Fe-MOF photocatalyst was characterized by XPS, BET, EIS, EDS, DRS, PL, FTIR, XRD, TEM, SEM and HRTEM techniques. Inspired by XRD, FTIR, XPS, EDS, TEM, SEM, and HRTEM analyses, the successful synthesis of n-n heterojunction TiO₂/Fe-MOF photocatalysts was proved. The migration efficiency of the light-induced electron-hole pairs was confirmed by the PL and EIS tests. TiO₂/Fe-MOF exhibited a significant performance for tetracycline hydrochloride (TC) removal under visible light irradiation. TC removal efficiency for TiO₂/Fe-MOF (15%) nanocomposite reached 97% within 240 min, ca. 11 times higher than pure TiO₂. The photocatalytic enhancement of TiO₂/Fe-MOF could be attributed to the broadening the light response range, forming an n-n junction between Fe-MOF and TiO₂ components, suppressing charge recombination. Based on recycling experiments, TiO₂/Fe-MOF had a good potential to be used in consecutive TC degradation tests.