Polyaniline-TiO2 composite photocatalysts for light-driven hexavalent chromium ions reduction

Multifunctional WO3/NiCo2O4 heterojunction with extensively exposed bimetallic Ni/Co redox reaction sites for efficient photoelectrochemical water splitting

“…It is significantly improved for WO 3 /NiCo 2 O 4 heterojunction that the is 21.09 % at 1.23 V vs. RHE, which is 2.35 times higher than bare WO 3 . The excellent behavior of photogenerated carrier in bulk may be attributed the built‐in electric field at interface of WO 3 and NiCo 2 O 4 due to formation of the heterojunction [61] . Furthermore, it is observed that the is slowly improved when the applied bias voltage is increased.…”

“…The excellent behavior of photogenerated carrier in bulk may be attributed the built-in electric field at interface of WO 3 and NiCo 2 O 4 due to formation of the heterojunction. [61] Furthermore, it is observed that the h sep is slowly improved when the applied bias voltage is increased. Because the internal separation efficiency is proportional to the width of the space charge layer, [62] the result can be concluded that the space charge layer close to the interface of WO 3 /NiCo 2 O 4 heterojunction and electrolyte becomes wider with the increase in external voltage.…”

Engineering a Rapid Charge Transfer Pathway for Enhanced Photocatalytic Removal Efficiency of Hexavalent Chromium over C3N4/NH2–UIO‐66 Compounds

“…However, with increasing of NU content on the surface of the CN nanosheet, the surface of CNU underwent a negative‐to‐positive charge transition (Figure S6, Supporting Information), and the adsorption capacities of Cr(VI) increased accordingly, due to the electron‐rich amino groups on MOF tending to protonate and form NH 4+ in acid solution, which provided a positive surface and an advantage for the adsorption of hexavalent chromium. [ 50–52 ] These results also suggest that the adsorption performance of Cr(VI) of CNU is mainly contributed by NU, which served as a potential platform for adsorption of Cr(VI) and the subsequent reduction reaction.…”

“…The peaks centered around 577.3 and 578.2 eV are attributed to the 2p 3/2 and 2p 1/2 of the +3 valence state of Cr. [ 52,55,56 ] The Cr(III) species deposited over the CN surfaces could inhibit the light harvester and the photoexcited electron transfer from CN to Zr clusters, which led to a tiny decrease in the photocatalytic activity after the five times recycling performance.…”

Engineering Surface N‐Vacancy Defects of Ultrathin Mesoporous Carbon Nitride Nanosheets as Efficient Visible‐Light‐Driven Photocatalysts

“…The excessive use of fossil fuels has made the energy crisis and environmental pollution two crucial issues, which forces people to develop other renewable energy sources to solve these two major problems. [1][2][3] Solar energy, as the most abundant renewable energy on the planet, has received extensive attention from researchers, so how to use and convert solar energy more effectively becomes the key issue. [4,5] In various solar energy projects, the photocatalysis technology can directly use solar energy to treat wastewater to degrade pollutants and decompose water to produce hydrogen.…”