Few-layered tungsten selenide as a co-catalyst for visible-light-driven photocatalytic production of hydrogen peroxide for bacterial inactivation

Abstract

Sustainable and "green" technologies for hydrogen peroxide (H2O2) production have aroused increasing interests, yet challenges prevail in production of H2O2 for environmental applications. In this study, tungsten selenide (WSe2) with...

Mechanistic Insight into the Heterogeneous Electro-Fenton/Sulfite Process for Ultraefficient Degradation of Pollutants over a Wide pH Range

“…Hydrogen peroxide (H 2 O 2 ), as a green and highly efficient oxidant used in advanced oxidation processes (AOPs), is commonly produced by an anthraquinone method, an electrochemical method, and photocatalysis. − Electro-Fenton (EF) is a new type of AOP, which can generate H 2 O 2 in situ on the surface of the cathode through a two-electron oxygen reduction reaction (ORR) (eq ), avoiding the risk of reagents in transportation, storage, or treatment. , The basic principle of this process is that Fe 2+ added to the solution reacts with the continuously produced H 2 O 2 to form a strong oxidant of hydroxyl radical ( • OH) (eq ); thus, it is efficient and environmentally friendly. However, traditional homogeneous EF has disadvantages such as a narrow pH application range (2.8–3.5), a slow rate of reduction of iron ions, and difficult recovery of the catalyst, which greatly limit its wide application …”

Sequencing batch photocatalytic H2O2 production over a magnetic resorcinol–formaldehyde polymer for on-site water purification by UV light irradiation

“…No any lattice fringe is observed in the SiO 2 region (inset in Figure 1C), indicating that the SiO 2 layer is dominated by the amorphous phase 39,40 . CTAB induces a positively charged surface of Fe 3 O 4 @SiO 2 , and then the RF copolymer as the shell layer is formed over Fe 3 O 4 @SiO 2 via a Stöber-like method 22,39 . The thickness of this shell layer is about 100 nm (Figure 1D).…”

“…551) and (440) planes of cubic Fe 3 O 4 , respectively. A broad diffraction band at about 20 o can be attributed to the (002) planes of graphitic carbon, suggesting the presence of πstacking benzenoid-quinoid couples 22,43 . The surface functional groups of MRF were also analyzed by FTIR spectra (Figure 1F).…”

Nano-WSe2 Is Absorbable and Transformable by Rice Plants

“…It is used in photovoltaic devices and ultra-thin LEDs and is an additive in lubricants due to its flake structure with small friction coefficient [11]. The reconfiguration or doping on WSe 2 with other atoms [12] enhances its applications in environmental engineering [13] and chemical engineering [14]. The wide application of nano-WSe 2 increases the possibility of its release into the environment.…”