Enhanced photocatalytic removal of hexavalent chromium through localized electrons in polydopamine-modified TiO2 under visible irradiation

Efficient Photoreduction of Hexavalent Chromium Using the Reduced Graphene Oxide–Sm2MoO6–TiO2 Catalyst under Visible Light Illumination

“…The photoreduction performances of different weight ratios of rGO–Sm 2 MoO 6 –TiO 2 are 60, 75, 96, and 92%, corresponding to weight ratios 30, 40, 50, and 60 mg, respectively. The increase of the catalyst amount increases the reduction of Cr­(IV) due to the increased adsorption by the catalyst particle and increased density in the area of illumination . Under these experimental conditions, 50 mg/100 mL of catalyst is found to be an optimum dosage for effective reduction of Cr­(VI) to Cr­(III) under visible light illumination in 70 min.…”

P25-induced polydopamine conformal assembly on Cu2O polyhedra for hydrophilic and stable photoelectrochemical performance

“…Compared with the Cu 2 O electrode, PDA coating does not block light absorption because it is the eumelanin polymer that has high light absorption. 50 According to our previous work, the black PDA exhibits a good capability for light absorption between 200 and 800 nm. 27 Moreover, an apparent enhancement of absorption can be seen for the composites.…”

Novel Ti-Coordination Polydopamine Nanocomposite with a Combination of Adsorption, Reduction, and Ion Exchange for Rapid Cr(VI) Removal

“…Chen 18 The as-prepared TiO 2 /PDA hybrid nanoparticles have an adsorption capacity of 500.24 mg/g and could reduce Cr(VI) to Cr(III) within 30 min under visible light irradiation. 8 Herein, we present a facile yet simple strategy to prepare a new PDA-derived advanced adsorbent with these functions by combining Ti and dopamine coordination and sequent selfpolymerization of the resulting Ti−dopamine complexes under hydrothermal conditions. Instead of using Ti ions as the source of TiO 2 for photocatalytic reduction, Ti ions are coordinated with a catechol group of PDA and uniformly distributed in the resulting Ti-coordination polydopamine nanocomposites (TCPNs).…”

“…Among the many methods for removing Cr­(VI), such as ion exchange, catalytic reduction, − and adsorption, , adsorption has been widely studied as one of the most economical and effective treatments . Among the reported adsorbents for Cr­(VI) removal, polydopamine (PDA)-derived materials have exhibited great promise for tackling Cr­(VI) pollution. ,,,− PDA possesses abundant phenolic hydroxyl and amino groups that are able to chelate Cr­(VI) ions, which endow the developed PDA-derived adsorbents with excellent Cr­(VI) removal performance.…”

“…Among the many methods for removing Cr­(VI), such as ion exchange, catalytic reduction, − and adsorption, , adsorption has been widely studied as one of the most economical and effective treatments . Among the reported adsorbents for Cr­(VI) removal, polydopamine (PDA)-derived materials have exhibited great promise for tackling Cr­(VI) pollution. ,,,− PDA possesses abundant phenolic hydroxyl and amino groups that are able to chelate Cr­(VI) ions, which endow the developed PDA-derived adsorbents with excellent Cr­(VI) removal performance. To date, a variety of PDA-derived materials have been explored for removing Cr­(VI) from wastewater, including PDA-coated cellulose nanocrystallines, , mesoporous PDA/titanium dioxide nanocomposites, PDA-coated magnetic Fe 3 O 4 particles, and porous PDA microspheres .…”