Facile Hydrothermal Synthesis of Z-Scheme Bi₂Fe₄O₉/Bi₂WO₆ Heterojunction Photocatalyst with Enhanced Visible Light Photocatalytic Activity

Abstract

An efficient binary BiFeO/BiWO Z-scheme heterojunction was fabricated through a facile hydrothermal route. The obtained BiFeO/BiWO displays high catalytic activity for rhodamine B (RhB) photodegradation, and 100% of RhB was photodegraded by BiFeO (7%)/BiWO within 90 min, which is much better than that by pure BiFeO and BiWO. The effective photoinduced carrier separation, the broadened photoabsorption range, high oxidation capacity of hole, and the high reduction power of electron are in charge of the elevated catalytic activity because of the formed Z-scheme system. In addition, the effects such as pollutant concentration, pH, inorganic anions, and water sources exerted on photocatalytic performance were also investigated, and the results suggest that BiFeO/BiWO still possesses a high photocatalytic performance. The free-radical trapping experiments and electron spin resonance spin-trapping technology disclose that hole (h), hydroxy radical (OH), and superoxide radical (O) are cardinal active radicals in the catalytic system. In terms of the above experimental analysis, a possible photodegradation mechanism of the as-fabricated photocatalyst is thoroughly elucidated. In addition, the possible RhB photodegradation pathway is also raised in the light of the analysis of liquid chromatography-mass/mass spectrometry. In addition, BiFeO/BiWO composite does not display dramatic reduction of the catalytic performance after five recycles. Thus, this study reveals that the as-obtained BiFeO/BiWO catalyst has a great prospect for the environmental purification.

The Study of the Optical Properties of C60 Fullerene in Different Organic Solvents

“…The dashed rectangle in Figure 5(b) is emphasized in Figure 5(d). The arrows shown in Figure 5(a) and 5(b) represent the region where the absorption declined, which was later used to estimate the band gap energies using the Kubelka-Munk function [76,77] as shown in equations (2) and (3), as follows:…”

Black Phosphorus, a Rising Star 2D Nanomaterial in the Post‐Graphene Era: Synthesis, Properties, Modifications, and Photocatalysis Applications

“…Zeng et al reported that porous g‐C 3 N 4 with ultrahigh specific surface area displayed stronger adsorption capacity of pollutants, which enhanced the mass transfer efficiency between pollutant and photocatalyst . Li et al reported that the flower‐like Bi 2 WO 6 displayed excellent visible light absorption ability owing to the multiple reflections of visible light between petals . And the ultrathin Bi 2 WO 6 shows high carrier mobility because of the shortened migration path .…”

Peroxidase‐Like Activity of Smart Nanomaterials and Their Advanced Application in Colorimetric Glucose Biosensors

“…Colorimetric biosensing does not need complicated and costly apparatus, and can be used in point‐of‐care diagnosis and on‐site analysis since the color changes can be read by the unaided eye . Peroxidase activity shows an enormous potential for actual application and has been applied to the degradation of pollutants or as detection kits . The ability to catalyze the oxidation of organic substrates to generate a color change and reduce their toxicity contribute to these extensive applications.…”