Fabrication of Direct Z-Scheme CoNiWO₄/Ph-gC₃N₄ Heterocomposites: Enhanced Photodegradation of Bisphenol A and Anticancer Activity

Abstract

Photocatalysis is realized by the design of a visible-light-active catalyst with robust redox capacity and broad absorption. In this study, a series of novel Z-scheme CoNiWO4/Ph-gC3N4 photocatalysts are synthesized to improve their redox property and photocatalytic activity toward broad visible light absorption. An intimate stable heterojunction is made between cobalt–nickel tungstate (CoNiWO4) and phenyl-doped graphitic carbon nitride (Ph-gC3N4), and its physicochemical properties are studied. The bifunctional properties of all of the synthesized materials were assessed by studying the decomposition of bisphenol A (BPA) and methyl orange (MO) dye as model pollutants, followed by an evaluation of their anticancer activity on human lung cancer cell lines. The photocatalyst with 20 wt % CoNiWO4 heterocomposite showed an enhanced response toward the removal of cancerous cells. The synthesized pristine CoNiWO4 and Ph-gC3N4 exhibit well-matched band structures and, hence, make it easier to create a Z-scheme heterocomposite. This may increase the lifetime of photoinduced charge carriers with a high redox power, thereby improving their photocatalytic and anticancer activity. An extensive analysis of the mechanism demonstrates that hydroxyl radicals (•OH) and superoxide radical anions (•O2 –) are responsible for the degradation of organic compounds via Z-scheme charge transfer approach. These findings point toward a new route for creating effective Co–Ni tungstate-based direct Z-scheme photocatalysts for various redox processes, particularly the mineralization of resistant organic molecules.

La/Fe bimetallic MOF-derived p-LaFeO3/n-CdS heterojunction: efficient photocatalytic degradation of organic contaminants and adsorption isotherms

“…39 The FTIR spectrum of CdS represents less intense peaks at 1009 and 1634 cm −1 that could be attributed to the cadmium-sulfide (Cd–S) bond. 40 The FTIR spectra of 8 LC, 15 LC and 25 LC heterojunctions shown in the figure represent that all the absorption bands corresponding to pure materials are present in the composite, which may acclaim the successful formation of heterojunctions between CdS and LaFeO 3 . A broad band appeared at ∼3447 cm −1 in all the samples, which could be due to adsorbed water.…”

Multifunctional electrospun nanofibrous scaffold enriched with alendronate and hydroxyapatite for balancing osteogenic and osteoclast activity to promote bone regeneration

“…TGA (TGA/DSC 2/1600-ThermoStar; METTLER TOLEDO, Switzerland) was used to employed thermal stability of different nanofibers. All samples were heated at a rate of 10 °C min −1 in a range of 25 °C-800 °C under a nitrogen atmosphere (Athar et al, 2023).…”

Poly Meta-Aminophenol (PmAP) as a Solid-State Electron Mediator in the Z-Scheme, Ag3PO4/CoFe2O4 Heterojunction: Mineralization of Highly Concentrated Bisphenol-A and Reactive Dyes Water Pollutants

“…To get rid of these kinds of organic contaminants from water bodies, photocatalysis has been proven to be a simple, effective, and inexpensive process that uses photocatalysts and light sources only. − Development of visible light active multicomponent heterostructure catalytic system with superior performance over single component catalysts like TiO 2 , ZnO, Ag 3 PO 4 , CdS, WO 3, etc. in terms of efficacy, stability, and facile regeneration is desirable. − Very often, these heterostructure systems have cumbersome synthetic procedures and lack adequate activity for the removal of these organic contaminants at higher concentrations.…”

“…in terms of efficacy, stability, and facile regeneration is desirable. 7 − 9 Very often, these heterostructure systems have cumbersome synthetic procedures and lack adequate activity for the removal of these organic contaminants at higher concentrations.…”