PbCrO4 yellow-pigment nanorods: An efficient and stable visible-light-active photocatalyst for O2 evolution and photodegradation

Abstract

Here, PbCrO 4 nanorods, a commonly used and low-cost yellow pigment, was synthesized via a simple precipitation reaction and can serve as a highly efficient oxygen production and photodegradation photocatalyst. The obtained PbCrO 4 nanorods exhibit excellent stability and photocatalytic performance for O 2 evolution from water. The production rate is approximately 314.0 μmol h −1 g −1 under visible light, and the quantum efficiency is approximately 2.16% at 420±10 nm and 0.05% at 600±10 nm. In addition, the PbCrO 4 shows good degradation performance for methylene blue, methyl blue, methyl orange and phenol under visiblelight irradiation. These results indicate that it is potential to fabricate an effective, robust PbCrO 4 photocatalyst by transforming heavy-metal pollutants Pb(II) and Cr(VI) into a highly efficient O 2 evolution and photodegradation material. This strategy which uses pollutant to produce clean energy and degrade contaminants is completely green and environmentally benign, and thus could be a promising way for practical environmental applications.

Construction of Defective Zinc–Cadmium–Sulfur Nanorods for Visible‐Light‐Driven Hydrogen Evolution Without the Use of Sacrificial Agents or Cocatalysts

“…Four characteristic peaks are observed under visible‐light irradiation (Figure a), and the standard ratios of the intensities are 1:2:2:1, which can be ascribed to . DMPO−OH . In contrast, the EPR signal is not detected under dark conditions, which indicates a single‐electron oxidation pathway for water to produce .…”

New pentlandite-like oxide semiconductors IrIn6XYO8 (X = Ga, In; Y = Ge, Sn, Ti) as potential candidates for photocatalytic water splitting under visible-light irradiation

“…5 For transition d 0 metal oxides, there are various kinds of titanates [SrTiO 3 , R 2 Ti 2 O 7 (R = La, Bi), Na 2 Ti 3 O 7 ], [6][7][8] titanium dioxide (TiO 2 ), 9 niobates (Sr 2 Nb 2 O 7 , PbBi 2 Nb 2 O 9 , Ba 5 Nb 4 O 15 ), [10][11][12] tantalates [ATaO 3 (A = Na, K), MTa 2 O 6 (M = Ca, Sr, Ba), Sr 2 Ta 2 O 7 ], 13,14 tungstates (PbWO 4 , CuWO 4 ), 15,16 and chromates (PbCrO 4 , Pb 2 CrO 5 ). 17,18 These transition metal oxides usually possess nd 0 electronic configuration, endowing the conduction band minimum (CBM) with empty d orbitals. The localized d orbitals lead to a highly narrowed band edge feature in CBM, which is unfavorable for the mobility of photogenerated electrons.…”

Putting the Squeeze on Lead Chromate Nanorods

“…27 The fit has been carried out using EOSFit. 28 For monazite-type PbCrO 4 nanorods the volume at ambient pressure (V 0 ), bulk modulus (B 0 ), and its pressure derivative (B 0 ′) are V 0 = 347.2(3) Å 3 , B 0 = 52.7(6) GPa, and B 0 ′ = 3.8 (5), being the implied value 29 for the second pressure derivative B 0 ″ = −0.0708 GPa −1 . These values agree within uncertainties with the results obtained from bulk PbCrO 4 , suggesting that the compressibility is not affected by the In order to analyze the anisotropy of the two phases observed in our study, we have determined for the first time the magnitudes and the directions of the principal axes of the compressibility tensor using PASCal.…”

“…This material has recently received a great amount of attention from both fundamental and applied research. Its applications are many, going from optoelectronic to photocatalytic water splitting , and degradation of pollutants under visible-light irradiation. , For optimizing them, it is necessary to accurately characterize the physical properties of PbCrO 4 . This information is also relevant for understanding the manufacturing processes of objects of cultural and historical significance; like Kandinsky’s reverse paintings on glass .…”