Fabrication of novel surface plasmon resonance induced visible light driven iridium decorated SnO2 nanorods for degradation of organic contaminants

Dhanalakshmi, M.; Saravanakumar, K.; Prabavathi, S. Lakshmi; Abinaya, M.; Muthuraj, V.

doi:10.1016/j.jallcom.2018.05.340

Cited by 56 publications

(27 citation statements)

References 69 publications

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“…As can be seen, the k values obtained for the Ir/CeO 2 series were higher than that estimated for the CeO 2 support. These results could be associated with the presence of the metal particles on the surface of the semiconductor, which effectively decreases the recombination process of the charge carriers, as reported by other authors . With regard to the effect of the metal content, it is possible to see that the k values increases with the increase of the Ir loading up to 1.0 wt%, however, with an Ir content of 2.0 wt%, the kinetic constant decreases.…”

Section: Resultssupporting

confidence: 90%

“…It is interesting to note that the photocatalytic reduction of the molecule increased with the increase of metal content up to 1.0 wt%, whereas for the highest Ir amount corresponding to 2.0 wt% the photoactivity decreased. These results suggest that the Ir content is a crucial aspect of the effective synergistic effect between metal nanoparticles and CeO 2 support, and the increase of the Ir content could cause the inhibition of the contact between the species . Besides, TEM analysis revealed that the 2.0 wt% Ir/CeO 2 photocatalyst presents a higher percentage of particles with an average diameter of 9–10 nm in relation to 1.0 wt% Ir/CeO 2 , and it is well‐known that the photoactivity can be negatively affected by high metal concentration on the semiconductor or an increase of the particle size.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Castañeda

Alvarado

Martínez

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Photoreduction of 4-nitrophenol (4-NP) photocatalytically to 4-aminophenol (4-AP) is considered a promising treatment of this recalcitrant pollutant. 4-aminophenol is widely applied as an intermediate in the pharmaceutical and agricultural industries. In this work, iridium/cerium dioxide (Ir/CeO 2 ) photocatalysts with different Ir contents (0.5, 1.0 and 2.0 wt%) were studied in the photoreduction of 4-NP using Na 2 SO 3 as hole scavengers under UV irradiation. In order to identify their physicochemical properties, the materials were studied by several techniques and photoactivity was monitored by UV-visible spectroscopy. RESULTS:The characterization results provided evidence that the modification of CeO 2 by impregnation of Ir causes a decrease in CeO 2 textural properties and its band gap energy. The photocatalytic reduction of 4-nitrophenol was enhanced by 26.1% using Ir/CeO 2 1.0 wt% in comparison with CeO 2 support. The phrase is related with the comparison between the photocatalytic behavior of Ir/CeO 2 1.0 wt% photocatalyst in regard the results evidenced with CeO 2 unmodified. An effect of the metal loading over photoactivity was observed and the optimal Ir content was 1.0 wt%. A reduction of 84% was obtained using 1.0 wt%Ir/CeO 2 , whereas for higher metal loading (2.0 wt%) 4-NP reduction decreased by 72%. CONCLUSION:The enhancement in the photocatalytic behavior of the Ir/CeO 2 series could be related to the presence of Ir + and Ir 0 species evidenced by X-ray photoelectron spectroscopy (XPS), thus, Ir + species could favor the adsorption of the pollutant and Ir 0 particles could act as trap of the photogenerated electrons that are responsible for reduction of the nitrocompound. The decrease in photoactivity when 2.0 wt% Ir/CeO 2 was used as photocatalyst could be associated with partial blockage of the surface active sites by increasing amounts of metal.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Castañeda

Alvarado

Martínez

et al. 2019

J of Chemical Tech & Biotech

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“…Hierarchical SnO2 ultrathin nanosheets degraded 93% of MB within 150 min [25]. Iridium (Ir) nanoparticles decorated SnO2 nanorods decomposed more than 97% of MB under 60 min irradiation [26]. In this work, the monodispersed SnO2 decorated diatomite composite achieved the fast degradation of Rh B (96.8%) and MB (96.97%) within 60 min.…”

Section: Photocatalytic Performance and Photodegradation Mechanismmentioning

confidence: 68%

“…From the spectrum of diatomite, it can be seen that there are obvious diffraction peaks at 21 [16], which reflect that the diatomite is a kind of porous SiO 2 . The characteristic peaks at 26 [17]. From the spectra of different SnO 2 loadings on diatomite, the peak intensity of SnO 2 in SD4 sample is obviously higher than other samples, which may be attributed to the highest SnO 2 fraction in the composite (Table 1).…”

Section: Composition and Structure Of Materialsmentioning

confidence: 94%

SnO2/Diatomite Composite Prepared by Solvothermal Reaction for Low-Cost Photocatalysts

Jiang

Wang

et al. 2019

Catalysts

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Abundant contaminants in wastewater have a negative effect on the natural environment and ecology. Developing highly efficient photocatalysts is a practical strategy to solve the pollution issue. In order to prevent the agglomeration of SnO 2 nanoparticles and improve the photocatalytic efficiency, porous diatomite is adopted as a low-cost template to load monodispersed SnO 2 nanoparticles by solvothermal reaction and sintering method. Through adjusting the mass of reactants, monodispersed SnO 2 nanoparticles (~15 nm) generated on diatomite template achieved the maximum specific surface area of 23.53 m 2 ·g −1 . When served as a photocatalyst for degrading rhodamine B (Rh B) and methylene blue (MB), the composite presents an excellent photocatalytic activity close to pure SnO 2 , and achieves the fast degradation of Rh B and MB dye in 60 min. The degradation process is in well agreement with the first-order kinetic equation. The superior photocatalytic performance of SnO 2 /diatomite composite is attributed to the physical adsorption of dye molecules on the pores of diatomite, and the superior photocatalytic activity of monodispersed SnO 2 nanoparticles. Due to the low-cost of diatomite and the easy preparation of SnO 2 nanoparticles, the SnO 2 /diatomite composite has a promising application prospect, even better than pure SnO 2 photocatalyst. Therefore, during the synthesis process, the selection of suitable templates is very crucial to control the uniform distribution of SnO 2 nanoparticles. As we all know, SnO 2 is often synthesized on graphene nanosheets to enhance the photocatalytic efficiency [8]. For example, Chen et al. [9] synthesized dense SnO 2 layers on two sides of graphene sheets as high-efficient photocatalysts. Wei et al.[10] synthesized dandelion-like SnO 2 on graphene sheets and presented an excellent photocatalytic performance when degrading Rhodamine B. However, the high cost of graphene or graphene oxide confines the wide application of graphene-metal oxides hybrid photocatalysts. As a cheap porous clay mineral, diatomite derives from a kind of single celled aquatic algae. It has some advantages, such as a low cost, large specific surface area, high porosity and chemical resistance. In the reported works about diatomite-based photocatalysts, diatomite is often acted as porous template to load TiO 2 nanoparticles by sol-gel method [11] or hydrolysis-deposition method [12]. However, up to now, there are only two works about SnO 2 /diatomite composites. Zhong et al. [13] synthesized SnO 2 nanowires on diatomite porous substrate. The composite was acted as gas sensing materials for detecting the response to SO 2 gas. Zhen et al. [14] synthesized SnO 2 on diatomaceous earth by hydrothermal method and investigated the potential application in the humidity sensing field. There are no reports about SnO 2 /diatomite photocatalysts.About the synthesis of SnO 2 , hydrothermal or solvothermal method is often adopted to synthesize various SnO 2 nanostructures. In our previous work, SnO 2 nanosheets consi...

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“…Many previous studies aimed to enhance the photocatalytic activity of SnO 2 -based semiconductors by introducing nanostructures and composites [29,30,31,32,33]. Different nanostructures for SnO 2 -based photocatalysts, such as nanoparticles [29], flower-like structures [30], and simonkolleite nanopetals [31], have been reported so far.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of SnO2 Aerogel/Reduced Graphene Oxide Nanocomposites via in Situ Annealing for the Photocatalytic Degradation of Methyl Orange

et al. 2019

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SnO2 aerogel/reduced graphene oxide (rGO) nanocomposites were synthesized using the sol–gel method. A homogeneous dispersion of graphene oxide (GO) flakes in a tin precursor solution was captured in a three-dimensional network SnO2 aerogel matrix and successively underwent supercritical alcohol drying followed by the in situ thermal reduction of GO, resulting in SnO2 aerogel/rGO nanocomposites. The chemical interaction between aerogel matrix and GO functional groups was confirmed by a peak shift in the Fourier transform infrared spectra and a change in the optical bandgap of the diffuse reflectance spectra. The role of rGO in 3D aerogel structure was studied in terms of photocatalytic activity with detailed mechanism of the enhancement such as electron transfer between the GO and SnO2. In addition, the photocatalytic activity of these nanocomposites in the methyl orange degradation varied depending on the amount of rGO loading in the SnO2 aerogel matrix; an appropriate amount of rGO was required for the highest enhancement in the photocatalytic activity of the SnO2 aerogel. The proposed nanocomposites could be a useful solution against water pollutants.

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Fabrication of novel surface plasmon resonance induced visible light driven iridium decorated SnO2 nanorods for degradation of organic contaminants

Cited by 56 publications

References 69 publications

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

SnO2/Diatomite Composite Prepared by Solvothermal Reaction for Low-Cost Photocatalysts

Facile Synthesis of SnO2 Aerogel/Reduced Graphene Oxide Nanocomposites via in Situ Annealing for the Photocatalytic Degradation of Methyl Orange

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Fabrication of novel surface plasmon resonance induced visible light driven iridium decorated SnO2 nanorods for degradation of organic contaminants

Cited by 56 publications

References 69 publications

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO2 photocatalysts under UV irradiation

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO2 photocatalysts under UV irradiation

SnO2/Diatomite Composite Prepared by Solvothermal Reaction for Low-Cost Photocatalysts

Facile Synthesis of SnO2 Aerogel/Reduced Graphene Oxide Nanocomposites via in Situ Annealing for the Photocatalytic Degradation of Methyl Orange

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Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation

Enhanced photocatalytic reduction of 4‐nitrophenol over Ir/CeO₂ photocatalysts under UV irradiation