- A novel approach to the synthesis of semiorganic ammonium hydrogen oxalate oxalic acid dihydrate single crystal and its characterization
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A different approach used in the synthesis of ammonium hydrogen oxalate oxalic acid dihydrate (NH4H3(C4O8)·2H2O) single crystals is presented. The crystals are synthesized using solvent evaporation technique. The analysis of the synthesized NH4H3(C4O8)·2H2O single crystals has been carried out through measurements such as single-crystal X-ray diffraction (SCXRD), powder XRD, UV–Vis and photoluminescence spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric and differential thermal analysis (TG–DTA), Vickers microhardness measurements and?current versus voltage (I–V) characteristics. The evaluation of the molecular structure of the crystals using SCXRD shows that they belong to the triclinic crystal system with space group P-1. The structural properties of the crystals are also evaluated using powder XRD measurements on their finely crushed powder. These measurements corroborate the results of SCXRD and confirm the triclinic system of the crystals. The optical properties like absorbance and emission of these crystals are determined using UV–Vis and photoluminescence spectroscopy, respectively. These measurements show that the crystals exhibit substantial emission in the blue region. The thermal stability and the decomposition mechanism of the crystals is studied using TG–DTA analysis. The mechanical strength of the crystals is determined using Vickers microhardness technique. The photoresponse of the NH4H3(C4O8)·2H2O crystals is analyzed from light-dependent I–V characteristics, and it is observed that the crystals exhibit photoresistive behavior.
- Mahendra,Fernandes, Jean Maria,Udayashankar
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- Reduced graphene oxide coupled CdS/CoFe2O4 ternary nanohybrid with enhanced photocatalytic activity and stability: a potential role of reduced graphene oxide as a visible light responsive photosensitizer
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We report the coupling of a CdS/CoFe2O4 (CdS/CFO) core/shell nanorod heterostructure onto the 2D platform of reduced graphene oxide (RGO) sheets by a facile soft chemical route. Intimate interfacial contact between CdS, CFO and RGO is achieved in the synthesis. The CdS/CFO/RGO nanohybrid exhibits an enhanced photocatalytic activity for the degradation of methylene blue under visible light irradiation. In addition to enhanced photocatalytic activity, this trio-coupled nanocomposite exhibits enhanced photostability and is magnetically separable from an aqueous solution due to the presence of CFO in the composite nanostructure and thus can be used for repeated operations of the photocatalytic process. A mechanism for the enhanced photocatalytic activity of the CdS/CFO/RGO has been proposed where the RGO in the ternary nanocomposite serves as a visible light responsive photosensitizer. Our present work indicates that the careful choice of a semiconductor core-shell nanostructure and its coupling with reduced graphene oxide has great potential in the design of efficient and stable visible light responsive photocatalytic materials.
- Singh, Simrjit,Khare, Neeraj
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p. 96562 - 96572
(2015/11/24)
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- Extraction of oxalic acid from solutions of electrolyte mixture
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Extraction of oxalic acid with tributyl phosphate and triisoamyl phosphate from solutions of its mixtures with nitric, phosphoric, sulfuric, and hydrochloric acid and with ammonium nitrate and chloride was studied. In the extractability series, oxalic aci
- Lebedev
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p. 1483 - 1486
(2009/05/06)
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