Photoelectrochemical degradation of orange II dye in wastewater at a silver–zinc oxide/reduced graphene oxide nanocomposite photoanode

Abstract

Degradation of dye monitored by visible spectrophotometry. Inset a: photocurrent response of the photoanode; inset b: proposed photoelectrochemical mechanism.

Advancement of Ag–Graphene Based Nanocomposites: An Overview of Synthesis and Its Applications

“…A high‐efficiency degradation of Direct Green BE under UV–vis light was observed using Ag/LaMnO 3 –graphene as photocatalyst . Furthermore, the removal of organic pollutants can be further enhanced by photocatalysis when combining with other advanced oxidation process (AOP) such as electrochemical oxidation . Commonly, their combination is known as photoelectrochemical process.…”

“…Commonly, their combination is known as photoelectrochemical process. Umukoro et al have reported the higher photoelectrochemical removal efficiency on orange II dye degradation by Ag–ZnO–rGO (93%) as a photoanode material than that by ZnO–rGO (87%) and rGO (73%) electrodes …”

Efficient Photocatalytic Degradation of Malachite Green in Seawater by the Hybrid of Zinc-Oxide Nanorods Grown on Three-Dimensional (3D) Reduced Graphene Oxide(RGO)/Ni Foam

“…The photocatalytic degradation of MG quickly reached 100% when exposed under UV light for only 15 min, while only 68% degraded by ZnO@NF, 38% by 3D RGO@NF (Figure 6b). The degradation of MG was analyzed by pseudo-first order kinetics, according to the previous reports [29,47]. The kinetic of ZnO/RGO@NF, ZnO@NF, and RGO@NF efficiency (%) on MG was studied and the degradation rate constants (k) are 0.29, 0.06, and 0.01 min −1 , respectively (Figure 6c).…”

“…RGO can also narrow the band gap and prevent nanoparticle agglomeration by providing a good dispersion of metal oxides within the composites, and thus enhance the photocatalytic efficiency [28]. Omotayo A. Arotiba et al synthesized a composite of silver (Ag), zinc oxide and RGO for efficient photoelectrochemical degradation and mineralization of organic pollutants in water treatment [29]. A quaternary TiO 2 /ZnO/RGO/Ag nanocomposite synthesized via facile microwave irradiation exhibited enhanced photoactivity for the degradation of rhodamine B under visible light [30].…”

Photoelectrocatalytic application of palladium decorated zinc oxide-expanded graphite electrode for the removal of 4-nitrophenol: experimental and computational studies

“…9,15 TiO 2 semiconductor photoanode is the most widely used semiconductor photoanode. [14][15][16][17][18][19][20] Nevertheless, in recent years, ZnO is being utilised as an alternative to TiO 2 due to the nontoxicity, availability, low cost, chemical and thermal stability, good catalytic efficiency and optoelectronic nature of ZnO. [21][22][23][24] ZnO has also found applications in photovoltaic devices, water splitting and organic pollutants degradation.…”