Robust charge carrier engineering via plasmonic effect and conjugated Π-framework on Au loaded ZnCr-LDH/RGO photocatalyst towards H₂ and H₂O₂ production

Abstract

Au loaded ZnCr-LDH/RGO ternary photocatalyst for H2 and H2O2 production under visible light illumination.

A facile, green and scalable approach to fabricate hierarchical ZnAl-LDH for efficient removal of hexavalent chromium

“…This is consistent with Cr III -based LDHs. 52,53 Therefore, an isomorphic substitution of partial Al 3+ by reduced Cr III in the sorption process is possible because of the very close ionic radius of Al 3+ (0.054 nm) and Cr III (0.052 nm). Additionally, the replaced Al 3+ may be transformed into amorphous Al(OH) 3 at a pH of 5.1 in the adsorption system.…”

0D–2D Fe2O3/Boron-Doped g-C3N4 S-Scheme Exciton Engineering for Photocatalytic H2O2 Production and Photo-Fenton Recalcitrant-Pollutant Detoxification: Kinetics, Influencing Factors, and Mechanism

“…Moreover, traditional removal techniques are not effective for this micro-pollutant, and hence, a sustainable and effective degradation technique is highly essential. − Further, hydrogen peroxide (H 2 O 2 ) is considered an invincible and environmental benign asset for the global economy in many aspects, which include medical pasteurization, food and paper production, environmental remediation, and chemical synthesis. For the energy sector, H 2 O 2 is a promising and green alternative to H 2 fuel due to its high energy density (1.72 MJ/kg in 50 wt % H 2 O 2 ), water solubility, facile storage, safe conveyance, and having H 2 O as a byproduct. − However, the traditional anthraquinone method addresses nearly 95% of the global H 2 O 2 demand, which operates under elevated temperatures, produces intensive toxic byproducts, and uses organic solvents. , Moreover, direct H 2 O 2 preparation using H 2 , O 2 , and Pd or Pd/Au alloy is also explored extensively but the use of expensive noble metals and explosion characteristics of involved gases require extreme attention. , Hence, development of a green and budget-friendly preparation technique is of utmost necessity. As a sustainable and clean alternative, semiconductor-based artificial photocatalytic H 2 O 2 production employing renewable feedstock via (i) a direct two-electron single-step reaction, (ii) indirect one-electron two-step reaction, or (iii) a combination of two •OH species has received immense interest from the global research community. − Over the years, diverse catalytic systems have been experimented on toward improved H 2 O 2 production, including metal sulfide/oxide/phosphide, MOFs, carbonaceous species, and polymeric organic materials; however, low visible photon absorption ability, faster carrier recombination, limited charge-transfer efficiency, and poor O 2 adsorption-activation capacity reduce the overall quantum efficiency. , Out of the abundant semiconductor photocatalysts tested so far, two-dimensional (2D) metal-free graphitic carbon nitride (g-C 3 N 4 ) has attracted tremendous attention toward photocatalytic H 2 O 2 generation and pollutant degradation due to its superb intrinsic characteristics. ,− Moreover, the conduction and valence band position of g-C 3 N 4 encourages O 2 reduction and restricts oxidative decomposition of H 2 O 2 compared to oxide-based systems.…”

Defect Control via Compositional Engineering of Zn-Cu-In-S Alloyed QDs for Photocatalytic H2O2 Generation and Micropollutant Degradation: Affecting Parameters, Kinetics, and Insightful Mechanism

“…Over the last decade and so, a wide range of photocatalytic materials have been examined toward H 2 O 2 generation, such as ZrS 3 , PEI/C 3 N 4 , Ni 2 P/CD, etc. ; similarly, several catalytic systems were also tested for antibiotic degradation, but the conversion of a laboratory-scale experiment to an industrial-scale one is still ongoing. − In this regard, the authors’ group has also made a tremendous contribution toward both H 2 O 2 production and antibiotic degradation over a wide range of materials like MIS/e-BCN, Au-ZnCr@LDH/RGO, ZnFe 2 O 4 @RGO, ZFCN, e-gCN, Ce 2 Zr 2 O 7 @RGO, TiO 2 /Au/CdS, etc. − …”