Cu and Ag modified mesoporous TiO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e114" altimg="si1.svg"><mml:msub><mml:mrow/><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math> nanocuboids for visible light driven photocatalysis

Nikhila, M.P.; John, Deepthi; Pai, Mrinal R.; Renuka, N.K.

doi:10.1016/j.nanoso.2019.100420

Cited by 9 publications

(4 citation statements)

References 68 publications

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“…4 for AABR‐100, there are four bands present in the Raman spectra of the two samples, located at 59.6, 94.1, 115.9 and 164.3 cm −1 . Among them, the two strongest bands at 59.6 and 115.9 cm −1 are attributed to A 1g internal Bi–Br stretching mode, whereas the small peaks at 93 and 164.3 cm −1 corresponded to A 1g first‐order vibration modes of Bi and E g internal Bi–Br stretching mode, respectively (31). However, AABR‐CMC50 demonstrated severe broadening and weakening of peaks, accompanied by peaks moved to lower frequency.…”

Section: Resultsmentioning

confidence: 99%

“…The O 1s XPS spectra in Fig. 3d exhibit a main peak at 528.97 eV, which can be deconvoluted into two dominant peaks located at 531.4 and 529.8 eV, as well as a low‐energy peak at 529.2 eV, corresponding to OH groups combined with metal cations in the oxygen‐deficient region (30), Ag‐O bond of AgIO 3 (31) and Bi‐O bond of [Bi 2 O 2 ] 2+ layers (32), respectively. As the binding energy of the three peaks for AABR‐CMC50 and AABR‐75 is almost the same, it can be concluded that the chemical state of O1s in the synthesized heterojunction photocatalysts does not change with the difference in the morphology and dominant crystal exposed.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced Photocatalytic Degradation of Indoor Low Concentration Gaseous Formaldehyde by Asymmetric Silveriodate Composited with 2D or 3D Bismuth Oxybromide

Lin¹,

Liu

Lin³

et al. 2023

Photochem & Photobiology

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Formaldehyde is one of the most hazardous and typical indoor VOCs air pollutants. Asymmetric AgIO3 was respectively composited with 3D hierarchically structured BiOBr and 2D BiOBr nanosheets to photodegrade gas‐phase formaldehyde. Ag/AgIO3/BiOBr(CMC) demonstrated better photocatalytic performance than Ag/AgIO3/BiOBr owning to the role of biomass solvent sodium carboxymethyl cellulose in increasing the specific surface area, reducing the band gap and changing the dominant facets. Moreover, Ag nanoparticles coming from the reduction in AgIO3 were confirmed by XRD, SEM and XPS. The surface plasma resonance effect of Ag NPs improved the efficiency of the light quantum. Besides, different exposed facets of {010} in BiOBr(CMC) and {001} in BiOBr resulted in distinct oxygen vacancy structures. could be generated via a two‐electron transfer pathway on the {010} dominant facets surface in AABR‐CMC, leading to the change in photolysis pathway and facilitating more ·OH produced by AABR‐CMC. Compared with pure AgIO3 and BiOBr or BiOBr(CMC), the photocatalytic efficiency of the composites was improved significantly. Optimal photodegradation efficiency for HCHO was achieved for AABR‐75 and AABR‐CMC50.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Degradation of Indoor Low Concentration Gaseous Formaldehyde by Asymmetric Silveriodate Composited with 2D or 3D Bismuth Oxybromide

Lin¹,

Liu

Lin³

et al. 2023

Photochem & Photobiology

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“…The light shielding effects caused by excess X-3B may also provide a negative impact for the photo-Fenton-like process [37]. In addition, the increased amount of X-3B molecules would also produce more intermediates that competed with X-3B parent molecules for •OH [38]. The •OH was considered to be the main factor in the degradation of organic pollutants in AOPs [39].…”

Section: Effect Of Initial X-3b Concentrationmentioning

confidence: 99%

Degradation of Reactive Brilliant Red X-3B by Photo-Fenton-like Process: Effects of Water Chemistry Factors and Degradation Mechanism

Chen

Wan

Qin

et al. 2022

Water

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Azo dye wastewater belongs to the highly concentrated organic wastewater, which is difficult to be treated by traditional biological processes. The oxidation efficiency of a single physicochemical method is not considerable. Recent research indicated that the advanced oxidation processes (AOPs) based on the highly reactive hydroxyl radical (∙OH) became one of the preferred methods in dealing with such dye wastewater. In this paper, the typical azo dye, reactive brilliant red X-3B, was employed as the target pollutant, and the transition metal Mn and hydrogen peroxide as the catalysts. A photo-Fenton-like process, UV/Mn2+-H2O2 system, was established, which enables a combination of various technologies to improve azo dye degradation efficiency while reducing disposal costs. The results indicated that the UV/Mn2+-H2O2 system had the synergism of Mn2+/H2O2 and UV/H2O2, which was 2.6 times greater than the sum of the two individual effects. And the degradation of X-3B reached the optimum under the conditions of 0.59 mmol/L of the Mn2+, 10 mmol/L of the H2O2, pH = 6 and a high level of DO. The ∙OH, generated from chem-catalytic and photocatalytic decomposition of H2O2, played the predominant role in the decolorization of X-3B and mineralization of its intermediates. The ∙OH tended to attack and break the chromophore group, resulting in the rapid decolorization of X-3B. The azo bond in X-3B was easy to be decomposed in the form of N2, while the triazinyl group was recalcitrant for ring opening. The degradation process of the UV/Mn2+-H2O2 system preferred to be conducted at an acidic condition and appropriate concentrations of Mn2+ and H2O2. The alkaline condition would decrease the utilization of H2O2, and excessive H2O2 would also quench the ∙OH.

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“…Transition metal ions like Fe, Mn, Cu, Ni, and Cr have been shown to modify the bandgap position of semiconductor materials [10][11][12][13][14][15] without enhancing the formation of water, which is the case when noble metals (e.g., Rh, Pt) are employed [3,9]. The switch towards the visible light region was also achieved by doping titanate-based materials with Fe [9,16,17], Cr [5,[18][19][20], and Cu [21,22].…”

Section: Introductionmentioning

confidence: 99%

Influence of Metal Oxide Particles on Bandgap of 1D Photocatalysts Based on SrTiO3/PAN Fibers

et al. 2020

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This paper deals with the study of the optical properties of one-dimensional SrTiO3/PAN-based photocatalysts with the addition of metal oxide particles and the determination of their bandgaps. One-dimensional photocatalysts were obtained by the electrospinning method. Particles of metals such as iron, chromium, and copper were used as additives that are capable of improving the fibers’ photocatalytic properties based on SrTiO3/PAN. The optimal ratios of the solutions for the electrospinning of fibers based on SrTiO3/PAN with the addition of metal oxide particles were determined. The transmission and reflection of composite photocatalysts with metal oxide particles were measured in a wide range of spectra, from the ultraviolet region (185 nm) to near-infrared radiation (3600 nm), to determine the values of their bandgaps. Thus, the introduction of metal oxide particles resulted in a decrease in the bandgaps of the obtained composite photocatalysts compared to the initial SrTiO3/PAN (3.57 eV), with the following values: −3.11 eV for SrTiO3/PAN/Fe2O3, −2.84 eV for SrTiO3/PAN/CuO, and −2.89 eV for SrTiO3/PAN/Cr2O3. The obtained composite photocatalysts were tested for the production of hydrogen by the splitting of water–methanol mixtures under UV irradiation, and the following rates of hydrogen evolution were determined: 344.67 µmol h−1 g−1 for SrTiO3/PAN/Fe2O3, 398.93 µmol h−1 g−1 for SrTiO3/PAN/Cr2O3, and 420.82 µmol h−1 g−1 for SrTiO3/PAN/CuO.

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Cu and Ag modified mesoporous TiO2 nanocuboids for visible light driven photocatalysis

Cited by 9 publications

References 68 publications

Enhanced Photocatalytic Degradation of Indoor Low Concentration Gaseous Formaldehyde by Asymmetric Silveriodate Composited with 2D or 3D Bismuth Oxybromide

Enhanced Photocatalytic Degradation of Indoor Low Concentration Gaseous Formaldehyde by Asymmetric Silveriodate Composited with 2D or 3D Bismuth Oxybromide

Degradation of Reactive Brilliant Red X-3B by Photo-Fenton-like Process: Effects of Water Chemistry Factors and Degradation Mechanism

Influence of Metal Oxide Particles on Bandgap of 1D Photocatalysts Based on SrTiO3/PAN Fibers

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