Z-Scheme BiOCl-Au-CdS Heterostructure with Enhanced Sunlight-Driven Photocatalytic Activity in Degrading Water Dyes and Antibiotics

Cai

et al. 2018

Chemistry A European J

127

BiOCl I solid solutions with different band gaps were synthesized by adjusting the initial Cl to I molar ratios through a chemical precipitation method at room temperature. The structures, morphologies and optical properties of the samples were characterized by XRD, XPS, Raman, SEM, TEM and UV/Vis, respectively. The photocatalytic experiments showed that the BiOCl I sample totally decomposed a large concentration of 50 mg L aqueous Rhodamine B (RhB) solution within 12 minutes under visible light irradiation (λ>420 nm), which is 11 times higher than that of pure BiOI. Furthermore, the electron band structure and density of states of BiOCl, BiOI and BiOCl I have been investigated using the DFT (density functional theory) calculation method and electrochemical methods. It was found that there are multiple crystal defects of Bi , Bi , and oxygen vacancies in the BiOCl I samples. The results for Mott-Schottky plots and valence-band XPS spectra showed the position of conduction band (CB) for BiOCl I was up-shifted, which is favourable to the redox capacity for the photocatalysts. It could be elucidated that the synergistic effects of multiple crystal defects and unique band structure are critical to improving solar driven photocatalytic activity. This work provides a new highlight toward the construction of high property photocatalysts by tuning the crystal defect and band structure in a simple and efficient way.

Section: Photocatalytic Testmentioning

confidence: 93%

Bi⁵⁺, Bi^(3−x)+, and Oxygen Vacancy Induced BiOCl_xI_1−x Solid Solution toward Promoting Visible‐Light Driven Photocatalytic Activity

Cai

et al. 2018

Chemistry A European J

127

Zeitschrift anorg allge chemie

“…Although the absorption of the 1 wt.‐% Ag‐loaded C/CdS sample is similar to that of C/CdS, the incorporation of a small amount of Ag in the C/CdS composites facilitates absorption beyond 600 nm . The semiconductor bandgap can be obtained using the following Kubelka–Munk function [Equation (1)]:

a h v = A {(h v - E_{g})}^{n / 2}

…”

Section: Resultsmentioning

confidence: 99%

Silver‐Loaded Bio‐Structured Carbon/Cadmium Sulfide Lamellar Composites with Enhanced Photocatalysis under Visible Light

Yan

Chen

You

et al. 2020

A silver (Ag)-loaded biostructured carbon/cadmium sulfide (CdS) lamellar composite photocatalyst was synthesized using a hydrothermal and photodeposition method. Camellia petals functioned both as a biological layered template and as a source of carbon. The prepared composite photocatalyst demonstrated good absorption under visible light and exhibited excellent photocatalytic degradation performance. The photocatalytic degradation efficiency of the obtained 457 composites substantially improved compared with pure CdS. The 5 wt.-% Ag-loaded C/CdS sample exhibited the highest photocatalytic activity, reaching 96.5 % after 180 min, which was 8.7 times that of pure CdS. Specifically, the biocarbon sheet enhanced the absorption of visible light. Furthermore, the high electrical conductivity of Ag can effectively transfer and separate photogenerated electrons and holes, thus enhancing both photocatalytic performance and stability.

Chemistry An Asian Journal

“…As stability is an important factor for a photocatalyst for its practical applications, we further investigated the stability of CNQDs/CN IO‐12 by performing recycling photocatalytic degradation experiments . From Figure a, it can be seen that CNQDs/CN IO‐12 maintains effective photocatalytic degradation of phenol after five cycles.…”

Section: Resultsmentioning

confidence: 99%

g‐C₃N₄ Inverse Opals with Isotype Heterostructure for Enhanced Visible‐Light‐Driven Photocatalysis

Zhou

Lei

et al. 2018

Self Cite

The photocatalytic activity of g-C N is limited by the low surface area and the fast recombination of photogenerated charges. In this work, a g-C N quantum dot (CNQDs) modified g-C N inverse opal (CN IO) metal-free composite (CNQDs/CN IO) was successfully synthesized by a simple calcination method. CNQDs/CN IO exhibited outstanding photocatalytic activity in the removal of organic pollutants represented by phenol, which can be ascribed to (i) the inverse opal structure that enhances the light harvesting, facilitates mass transfer, and provides adequate surface area for photocatalytic reactions; (ii) the incorporation of CNQDs in the framework of g-C N promotes photogenerated charge separation and transfer across the interfaces between CN IO and CNQDs, leading to excellent photoelectrochemical properties. The strategy of self-modification of g-C N with special structures provides a rational design idea to fabricate highly efficient metal-free photocatalysts.