Insights into the Mechanism of the Bi/BiVO4 Composites for Improved Photocatalytic Activity

Abstract

The increasing concentration of residual ciprofloxacin (CIP) can cause potential harm to the environment. Photocatalysis has been regarded as an effective method for the degradation of CIP. Bi/BiVO4 with excellent photocatalytic performance was synthesized partial reduction with NaBH4. The structure, morphology, composition, and optical performance of BiVO4 and Bi/BiVO4 were characterized by a variety of techniques. The results showed that the Bi/BiVO4 exhibits high photocatalytic activity in the degradation of CIP. Comparison of BiVO4 and Bi/BiVO4 has lower photoluminescence intensity and higher photocurrent responses intensity. The introduction of Bi made Bi/BiVO4 have a higher charge separation efficiency and generate more active free radicals. In addition, the radical trapping experiments revealed that superoxide free radicals and holes were the main active free radicals during the degradation of CIP. The pathway of CIP degradation was investigated through high performance liquid chromatography-mass spectrometry, and a possible degradation mechanism was proposed.

Facile Hydrothermal Synthesis of BiVO4/MWCNTs Nanocomposites and Their Influences on the Biofilm Formation of Multidrug Resistance Streptococcus mutans and Proteus mirabilis

“…The weaker PL intensity in the BiVO 4 /MWCNTs nanocomposite was related to lower recombination rate of the photogenerated (e–h) pairs. Thereby, the emission intensity of the BiVO 4 /MWCNTs nanocomposite is lower than that of pure BiVO 4 , which may be due to the existence of MWCNTs inhibiting the recombination of the photogenerated charges …”

“…Thereby, the emission intensity of the BiVO 4 /MWCNTs nanocomposite is lower than that of pure BiVO 4 , which may be due to the existence of MWCNTs inhibiting the recombination of the photogenerated charges. 59 …”

“…Thereby, the emission intensity of the BiVO 4 /MWCNTs nanocomposite is lower than that of pure BiVO 4 , which may be due to the existence of MWCNTs inhibiting the recombination of the photogenerated charges. 59 The transmission electron microscopy images (TEM) were utilized to study the morphology and microstructure of pure BiVO 4 and the BiVO 4 /MWCNTs nanocomposite, as demonstrated in Figures 6(a,b) and 7(a−d) at different magnifications, respectively. It can be seen from Figure 6(a,b) that the primary particles of pure BiVO 4 are made of nanoparticles that are presented as somewhat larger particles and aggregated to create a cluster with an average diameter of about 0.044 μm during the hydrothermal method.…”

A novel n–p heterojunction Bi2S3/ZnCo2O4 photocatalyst for boosting visible-light-driven photocatalytic performance toward indigo carmine

“…It is generally agreed that the separation of photogenerated charges is more effective, and its photocatalytic performance is the greater intensity of photocurrent. 35,38,39 Moreover, when the lamp is switched on, the photocurrent of 12.0Bi 2 S 3 /ZC continually rises, showing that the photogenerated electron-hole pairs separate continuously.…”

Electrospun Porous Nanofibers: Pore−Forming Mechanisms and Applications for Photocatalytic Degradation of Organic Pollutants in Wastewater

“…It has structurally stable groups such as benzene ring, cyclopropyl group, carbonyl group, and contains fluorine atoms. It can inhibit bacterial growth and is difficult to spontaneously degrade [ 149 , 150 ]. Due to its high solubility, bacterial resistance, and difficulty in degradation, its long−term bioaccumulation can have genotoxic effects on aquatic organisms and humans [ 151 ].…”