Photocatalytic Degradation of Methyl Orange Dyes Using Green Synthesized MoS2/Co3O4 Nanohybrids

Abstract

In this work, a new binary MoS2/Co3O4 nanohybrids was successfully fabricated and the chemical structures, morphologies, electrochemical and optical characterizations were carried out. In addition, heterojunction nanoparticles present in S-scheme structures act as electron traps and promote light absorption capacity for the degradation of Methyl orange (MO) with visible-light activity. MoS2/Co3O4 nanohybrids suggested excellent photocatalytic performance compared to bare MoS2 and Co3O4, where 95.6% of MO was degraded within 170 min, respectively. The results also showed excellent stability and recyclability over five consecutive cycles, without noticeable changes in the nanocomposite structure. The boosted photocatalytic degradation and redox activities of MoS2/Co3O4 can be attributed to the created S-scheme heterostructure to facilitate the separation of and to delay recombination of photoinduced charge carriers. We believe that this strategy of exploiting nanohybrid photocatalysts has great potential in the field of environmental catalysis and diverse applications.

Facile synthesis of efficient Co3O4 nanostructures using the milky sap of Calotropis procera for oxygen evolution reactions and supercapacitor applications

“…High-resolution spectra enabled the identification of the chemical states of cobalt and oxygen on the surface. In the case of Co 2p core level signals, the spectra were decomposed into three spin–orbit doublets (2p 3/2 –2p 1/2 ) along with the corresponding shake-up satellites, consistent with a cobalt spinel structure and well confirmed by previous studies, 71,72 as shown in Fig. 5b.…”

Structured Semiconductors in Photocatalysis

“…This catalyst demonstrated the best water splitting effect. Furthermore, after adding a 0.25 M mixed solution of Na 2 S and Na 2 SO 3 as the sacrificial reagent, the hydrogen production efficiency from water splitting reached 6654 µmol g −1 h −1 after 5 h. Tien et al [4] synthesized a new binary MoS 2 /Co 3 O 4 nanohybrids. The heterojunction presented an S-scheme structure that acted as electron traps and promoted light absorption capacity for the degradation of methyl orange under visible light.…”

A Novel ZnO/Co3O4 Nanoparticle for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

“…Co 3 O 4 , as a potential transition metal oxide, is included in several applications, such as hydrogen production, the removal of pollutants, and solar energy conversion [27]. However, pristine Co 3 O 4 is not a better material for photocatalysts due to its high electron and hole recombination rate, which causes a lower electron and hole pair separation ability and poor photocatalytic performance [28]. However, the wide bandgap of a single component and the quick recombination rate of the photoinduced charge carriers are major barriers to their real utilization in environmental remediation under visible light activity [29].…”