Porous Graphene Wrapped SrTiO₃ Nanocomposite: Sr–C Bond as an Effective Coadjutant for High Performance Photocatalytic Degradation of Methylene Blue

Abstract

Porous graphene-SrTiO3 (PGST) composite prepared by a facile solvothermal method was tested for its photocatalytic activity in degradation of methylene blue (MB) dye. First-principles density functional theory calculations were also carried out to study the effect of nanocomposite formation on the electronic structure and density of states. The combined experimental and theoretical study gave insights regarding the formation of the Sr–C bond which enhanced the charge transport, effectively separating the charge carriers and reduced their recombination rate. The formation of PGST nanocomposite favorably tuned the electronic structure with decreased band gap due to introduction of the hybridized states extending the absorption to the visible region of electromagnetic spectrum. The microscopy studies revealed loofah like PG wrapped SrTiO3 nano structures with contusions providing high surface area facilitating adsorption of MB dye. Degradation of ∼92% was obtained by 7.5 PGST in 120 min with high cyclic stability indicating its suitability as an efficient photocatalyst for the treatment of pollutants.

Rhodium doping augments photocatalytic activity of barium titanate: effect of electronic structure engineering

“…† We observe that the 0.9 Rh sample shows the least activity of 57% with a rate constant of 0.0068 min À1 . The kinetics of the photocatalytic degradation of MB by BaTiO 3 and Rh-doped BaTiO 3 samples are well in agreement with the pseudo rst-order rate equation given by eqn (3).…”

“…1,2 Since oxides possess a large band gap which prohibits absorption of the visible range of solar radiation, various strategies such as formation of composites with 2D materials, heterostructures and doping have been implemented to facilitate the process of photocatalysis. [3][4][5][6] Among oxides, multi-cation oxides such as tungstates, titanates, and vanadates are a convenient choice as they can provide multiple sites for doping. [7][8][9][10] It is well known that SrTiO 3 , a perovskite material, has been extensively studied for photocatalysis in degradation of methylene blue (MB) dye by tuning its band gap via doping, but only a few reports exist on BaTiO 3 .…”

A porous graphene–NiFe2O4nanocomposite with high electrochemical performance and high cycling stability for energy storage applications

“…In order to solve this issue, researchers have tried to incorporate oxides of metals/spinels inside the sheets so as to keep the sheets apart by adding foreign molecules as spacers. [3][4][5][6] In this scenario, spinels are of much interest, as they provide high electrical conductivity owing to their abundance, presence of two metal domains and their environmentally benign nature. [7][8][9] Thus, composites of PG and spinels are expected to provide superior electrochemical properties compared to single oxides due to their high mechanical strength, stability, high electrical conductivity and enhanced physico-chemical properties.…”

Preparation of High-Performance CdS@C Catalyst Using Cd-Enriched Biochar Recycled From Plating Wastewater

“…The carbon carrier prevented the aggregation and photocorrosion of catalyst particles and facilitated the transport and contact of substrates between the support and the active sites (Gao et al, 2011;Han et al, 2011;Huang et al, 2018;Chen et al, 2019c). In light of these advantages, biochar-supported CdS composites may greatly enhance the photocatalytic activity and stability of the catalysts (Ma et al, 2017;Huang et al, 2018Huang et al, , 2019Bantawal et al, 2019;Cao et al, 2019;Hu et al, 2019).…”