In this study, bismuth doped copper aluminate (CuAl2-xBixO4 x = 0, 0.01, 0.03, 0.05 and 0.10) nanoparticles were prepared via the solution combustion method and characterized by numerous procedures like powder X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, diffuse reflectance spectroscopy (DRS), scanning electron microscopy equipped with energy dispersive X-ray analysis (SEM-EDAX) and vibrating sample magnetometer (VSM). UV–Vis spectra exhibit low band gap energy ranging from 1.77 to 1.88 eV for the synthesized semiconductor oxide nanoparticles. The photocatalytic activity of copper aluminate and bismuth doped copper aluminate nanoparticles was studied by performing the decomposition of organic pollutants such as Methylene blue and Rhodamine-B under UV-light and visible light. It has been noticed from the results that the highest degradation was observed for Methylene blue dye with the bismuth doped copper aluminate (CAB03) nanoparticles compared to Rhodamine B. 99.71% degradation of Methylene blue was obtained within 60 min under UV-light irradiation and 99.90% within 60 min under visible light (H2O2) with 25 mg of catalyst. © 2017 Elsevier B.V.

Sumathi S

Department of Chemistry

School of Advanced Sciences

Vellore Campus

Kirankumar V.S

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Materials Chemistry and Physics

In this study, yttrium doped zinc ferrite (ZnFe2−xYxO4x = 0.01–0.1) and yttrium and copper co-doped zinc ferrite (CuyZn1−yFe2−xYxO4x = 0.1 and y = 0.5) were synthesized by solution combustion method. The synthesized nanoparticles were authenticated by various techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy–energy dispersive X-ray analysis (SEM-EDAX) and UV–visible spectroscopy. The photocatalytic activity of synthesized nanoparticles was studied by performing the degradation of methylene blue (MB) under visible light. 95% of MB was degraded in 180 min using yttrium-doped zinc ferrite. 89% of MB was degraded in 30 min using copper and yttrium co-doped zinc ferrite under visible light using 10 mg of the catalyst and 50 µl of hydrogen peroxide. Photocatalytic degradation of colorless pollutant bisphenol A also carried out using the doped zinc ferrite. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.

Journal of Materials Science: Materials in Electronics

Synthesis, characterization, optical and photocatalytic activity of yttrium and copper co-doped zinc ferrite under visible light

Cerium-doped copper aluminate (CuAl2- xCexO4, x = 0, 0.01, 0.03, and 0.05) photo-catalysts were synthesized by combustion route with an aim to improve the photocatalytic activity of copper aluminate under visible-light. The synthesized compounds were analyzed by standard analytical instruments such as powder XRD, FT-IR, UV-DRS, SEM-EDAX, and HR-TEM. XRD results explained that rising cerium ion concentration from 0 to 0.03, increase the lattice parameter and decreases the average crystalline size. The band gap energy of copper aluminate (1.81 eV) was reduced to 1.43 eV by introducing the cerium ion. The photodegradation performance of the synthesized compounds was recorded by studying the degradation of organic pollutants such as Rhodamine B and Methylene blue dyes under visible light. Cerium doped copper aluminate (x = 0.03) nanoparticles shows 98% degradation of RhB and 96% degradation of MB after 180 and 90 min than the doped (x = 0.01, 0.05) and undoped copper aluminate (x = 0) nanoparticles, respectively. The reactive species h+ and ·O2 ‒ plays the most important role in the photocatalytic degradation. The photodegradation of colorless pollutant Bisphenol A was carried out under UV-light. Among the series of synthesized compounds, CuAl1.97Ce0.03O4 nanoparticles were found to be the more active photo-catalyst for the degradation of Rhodamine B and Methylene blue. © 2018 Taiwan Institute of Chemical Engineers

Journal of the Taiwan Institute of Chemical Engineers

Photocatalytic performance of cerium doped copper aluminate nanoparticles under visible light irradiation

Nickel aluminate (NiAl2O4) and doped nickel aluminate (Ni1-xMxAl2O4; M = Mg, Zn, Cu; x = 0.1) were prepared by sol-gel method using citric acid. The synthesized compounds were analyzed by various techniques such as powder XRD, FTIR, SEM-EDAX and UV-DRS. The lattice parameter was found to increase with the copper, zinc and magnesium doping in nickel aluminate. The band gap was decreased from 3.0 eV (NiAl2O4) to 2.9 (zinc doped), 2.7 eV (magnesium doped) and increased to 3.1 eV in the case of copper doping. The catalytic study was carried out for a cationic (methylene blue) and an anionic dye (methyl orange). The percentage degradation of methyl orange using Zn0.1Ni0.9Al2O4 and Mg0.1Ni0.9Al2O4 was found to be 92% (180 min) and 96% (90 min). 93% (120 min) and 97% (120 min) degradation of methylene blue was observed using zinc doped and magnesium doped nickel aluminate respectively. These results are comparatively higher than its parent analogue (94% (180 min) degradation against methyl orange and 91% (120 min) against methylene blue). Whereas the percentage degradation was found to be less in the case of Cu0.1Ni0.9Al2O4 (83% (180 min) against methyl orange and 90% (120 min) against methylene blue). © 2018 Elsevier Masson SAS

Solid State Sciences

Photocatalytic activity of divalent ion (copper, zinc and magnesium) doped NiAl2O4

In this article, we have discussed the biosynthesis of palladium nanoparticles (PdNPs) using aqueous Saccharomyces cerevisiae extract and its photocatalytic application. The biosynthesised PdNPs were characterised by UV-Vis spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX) and Atomic force microscopy (AFM). The formation of PdNPs was confirmed from the disappearance of the peak at 405 nm in the UV-Vis spectrum. Agglomerated and hexagonal shaped PdNPs were noted by SEM. FTIR was performed to identify the biomolecules responsible for the synthesis of PdNPs. Bioactive compounds in the yeast extract acted as secondary metabolites which facilitated the formation of PdNPs. The yeast synthesised PdNPs degraded 98% of direct blue 71 dye photochemically within 60 min under UV light. © 2018 Vietnam Academy of Science &amp; Technology.

Fulltext

Advances in Natural Sciences: Nanoscience and Nanotechnology

Biosynthesis of palladium nanoparticles using Saccharomyces cerevisiae extract and its photocatalytic degradation behaviour

In this study, cobalt ferrite and bismuth substituted cobalt ferrite (CoFe2−xBixO4 x=0, 0.1) nanoparticles were synthesized by two different methods viz combustion and co-precipitation. The nanoparticles were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), diffuse reflectance spectroscopy (DRS), scanning electron microscopy-energy dispersive X-ray analyzer (SEM-EDX) and vibrating sample magnetometer (VSM). The results of powder XRD pattern showed an increase in lattice parameter and decrease in particle size of cobalt ferrite by the substitution of bismuth. Catalytic activity of cobalt ferrite and bismuth substituted cobalt ferrite nanoparticles synthesized by two different methods were compared for the reduction of 4-nitrophenol to 4-aminophenol using NaBH4 as a reducing agent. © 2016 Elsevier B.V.

Journal of Magnetism and Magnetic Materials

Comparison of catalytic activity of bismuth substituted cobalt ferrite nanoparticles synthesized by combustion and co-precipitation method

Dyes and Pigments

Comparison of color and optical absorbance properties of divalent ion substituted Cu and Zn aluminate spinel oxides synthesized by combustion method towards pigment application

Copper aluminate nanostructured materials were synthesized by a microwave combustion method (MWCM) using the plant extract (aloe vera) as a fuel without using any other template or surfactant. For comparison, it was also prepared by using the conventional combustion method (CCM). The as-synthesized copper aluminate was characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), high resolution scanning electron microscopy (HR-SEM), energy dispersive X-ray analysis (EDX), diffuse reflectance spectroscopy (DRS), photoluminescence (PL) spectroscopy, nitrogen adsorption/desorption isotherms, and vibrating sample magnetometer (VSM). The results indicated that the copper aluminate nanomaterials obtained by MWCM shows good crystallinity with the uniform size distribution than the ones prepared by CCM. The XRD and FT-IR results confirmed the crystal structure of copper aluminate. The formation of copper aluminate nano- and microstructures were confirmed by HR-SEM. The optical absorption and photoluminescence emissions were determined by DRS and PL spectra, respectively. The effect of the catalyst and the oxidant on the catalytic oxidation of benzyl alcohol was also investigated. © 2014 Elsevier Ltd.

Materials Science in Semiconductor Processing

Nanostructured copper aluminate spinels: Synthesis, structural, optical, magnetic, and catalytic properties

Nanocrystalline N-doped ZnSb2O6 is synthesized in a single step in single phasic form by a novel combustion method.

Journal	Data powered by TypesetMaterials Chemistry and Physics
Publisher	Data powered by TypesetElsevier BV
ISSN	0254-0584
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