Visible Light Response Photocatalytic Performance of Z-Scheme Ag₃PO₄/GO/UiO–66–NH₂ Photocatalysts for the Levofloxacin Hydrochloride

Abstract

A Ag3PO4/GO/UiO–66–NH2(AGU) composite photocatalyst was prepared by an ultrasonic-assisted in situ precipitation method. The optical property, structure, composition, and morphology of photocatalysts were investigated using UV–vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, electrochemical impedance spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive spectrometry, transmission electron microscopy, Fourier transform infrared spectroscopy, and charge flow tracking by photodeposition of Pt and PbO2 nanoparticles. In comparison with Ag3PO4 and Ag3PO4/UiO–66–NH2(AU), the AGU composite photocatalyst showed heightened photocatalytic performance for the degradation of levofloxacin hydrochloride (LVF). The AGU photocatalyst (dosage: 0.8 g/L) with 1% mass content of graphene oxide (GO), the mass ratio of Ag3PO4 and UiO–66–NH2(U66N) reached 2:1, showed the highest photodegradation rate of 94.97% for 25 mg/L LVF after 60 min of visible light irradiation at pH = 6. The formation of a heterojunction and the addition of GO synergistically promote faster separation of electron–hole pairs, retain more active substances, and enhance the performance of the photocatalyst. Furthermore, the mechanism of the Z-scheme of the AGU composite photocatalytic is proposed.

Optimization of Visible-Light-Driven Ciprofloxacin Degradation Using a Z-Scheme Semiconductor MgFe2O4/UiO-67

“…The peaks located at 1414 and 1590 cm –1 correspond to the CC and OC–O stretching vibrations of the carboxylate group in BPDC, respectively . The absorption bands observed in the regions of 670–900 and 1000–1260 cm –1 were attributed to the C–H bending vibration and the C–O stretching vibration of the metal–organic framework linker, respectively. , Peaks observed at 458 and 670 cm –1 are assigned to Zr–OH and Zr–O vibrations, respectively . It is noteworthy that all of the MU- x composites displayed peaks at 570 and 440 cm –1 , corresponding to the Fe–O and Mg–O vibrations in MgFe 2 O 4 …”

“…43 The absorption bands observed in the regions of 670−900 and 1000−1260 cm −1 were attributed to the C−H bending vibration and the C−O stretching vibration of the metal−organic framework linker, respectively. 45,46 Peaks observed at 458 and 670 cm −1 are assigned to Zr−OH and Zr−O vibrations, respectively. 47 It is noteworthy that all of the MU-x composites displayed peaks at 570 and 440 cm Morphology Features.…”

Fabrication of MIL-53(Fe)/Ag3PO4 cooperative photoreduction of Ag0 particles with outstanding efficiency for photodriven H2 evolution and pollutant degradation

“…Conversely, Pb 2− will be oxidized to PbO 2 at a place rich in h + . 63 The optical deposition principle equations are shown in the following formulae:Pt 4+ + 4e − → PtPb 2− + 2h + + 2O 2− → PbO 2 …”

MOF-Derived In2O3 Microrod-Decorated MgIn2S4 Nanosheets: Z-Scheme Heterojunction for Efficient Photocatalytic Degradation of Tetracycline

“…Currently, the main strategies used by researchers to achieve enhanced photocatalytic activity of MIS include morphology control, constructing heterojunctions, and elemental doping . Among them, the construction of heterojunctions is considered to be a feasible and effective strategy to improve photocatalytic efficiency because it can broaden the light absorption range by using components with staggered energy band structures. , In particular, the construction of the Z-scheme heterojunction not only further improves the photoresponse of the composites but also promotes the efficient separation of these carriers. − …”