A novel bismuth hydroxide (Bi(OH)₃) semiconductor with highly-efficient photocatalytic activity

Abstract

Herein, a novel Bi(OH)3 photocatalyst was successfully synthesized. Benefiting from the suitable band positions, abundant alkaline groups and oxygen vacancies, the as-prepared semiconductor exhibits efficient activity in both photocatalytic CO2...

Hydroxyapatite-based catalysts for CO2fixation with controlled selectivity towards C2 products. Phenomenal support or active catalyst?

“…More specically, the conversion of carbon dioxide (CO 2 ) into C2 products such as ethanol (EtOH) or acetic acid is extremely desired. 1,2 Although the use of photo-and electrocatalysts has been successfully reported for the activation of the thermodynamically stable CO 2 molecule through the use of supported metallic and bimetallic catalysts, [3][4][5][6][7][8] promoting the C-C coupling from different CO 2 molecules while preserving C-O and CO bonds is challenging, usually leading to poor selectivity. Thus, the specic design of catalysts with exceptional synergies of metal-support has been explored.…”

“…In order to achieve the enhanced catalytic activity reported, HAp must undergo a complete lattice rearrangement reaching the permanently polarized state (here-aer denoted as p-HAp) consisting of a highly crystalline HAp where all the hydroxyl groups in the lattice are aligned pointing towards a specic direction. 21 The resulting improved electrical properties of p-HAp not only drive the catalytic xation of CO 2 , CH 4 or N 2 into highly valuable chemical products, [22][23][24] but also result in enhanced proton conductivity and customized surface charge accumulation which allows control by design of the selectivity of the catalyst, termed as catalytic plasticity. 25 Such extraordinary behavior emerging from extremely accurate control and optimization of the crystal lattice structure of p-HAp clearly diverges from the traditionally poor attention given to HAp when used only as a catalytic support in favor of metal optimization.…”

Role of ZrO2 in TiO2 composites with rGO as an electron mediator to enhance the photocatalytic activity for the photodegradation of methylene blue

“…Finally, the superoxide (O 2 ˙ − ) and hydroxyl radicals (˙OH) degrade the organic molecules to simpler fragments. 105,113 This process of migration and capture of photo generated charges due to the presence of dispersed impurities improved the (e − /h + ) pair separation and reduced the recombination rate, as shown in the proposed mechanism, Fig. 13.…”

Bismuth-based semiconductors applied in photocatalytic reduction processes: fundamentals, advances and future perspectives

“…33,34 Therefore, when designing the BBS for the photocatalytic reduction processes, various factors such as the basic properties of semiconductors and the separation efficiency of electron-hole should be considered. 35 The basic properties of the semiconductor, such as the electronic structure and exposed crystal plane, directly affect the adsorption and activation of the reactant gas molecules by the catalyst material. 36 At the same time, when broadening the absorbing range to the visible part of the solar spectrum by doping, adding co-catalysts and other modifications are also important for highly-efficient photocatalyst design.…”