Indian Journal of Chemistry

Sect. A: Inorganic, Bio-inorganic, Physical, Theoretical & Analytical

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CODEN: ICACEC; ISSN: 0376-4710 (Print), 0975-0975 (Online)

 

 

 

 

VOLUME 56A

NUMBER 10

OCTOBER 2017

 

CONTENTS

 

 

1007

 

Electrodeposition of platinum-iridium nanoparticles on carbon nanotubes and their electrocatalytic oxidation of glucose

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bohua Wu*, Jiajin Zhu, Xue Li, Ting Zhou,
Liqiu Mao & Shanxin Xiong

 

 

 

Highly dispersed PtIr nanoparticles have been electrodeposited on carbon nanotubes by potentiostatic method in 0.5 M H2SO4+0.5 M glycerol aqueous solution. The PtIr (1:1) NPs/CNTs
catalyst exhibits excellent electrocatalytic activity and
stability towards glucose oxidation. CV results show that the
PtIr (1:1) NPs/CNTs/GC electrode exhibits better electrocatalytic activity than PtIr(3:1)NPs/CNTs/GC, PtIr(1:3)NPs/CNTs/GC, and
Pt NPs/CNTs/GC electrodes.

 

GA.tif

 

 

 

1014

 

Phthalate precursor mediated synthesis of cadmium oxide nanoparticles and their photocatalytic application

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dattaprasad D Narulkar, Teena A Jalmi Gaude & Sunder N Dhuri*

 

 

 

Cadmium oxide samples have been prepared by the
thermal decomposition of the precursors, [Cd(pht)(H2O)], [Cd(pht)(Im)(H2O)0.5], [Cd(pht)(MeIm)], and [Cd(pht)(bpy)(H2O)2]. The particle size of CdO nanoparticles ranges from 53–62 nm as evident by PXRD, SEM, and TEM studies. The band gap values for CdO samples are in the range 1.95–1.98 eV. The photolytic degradation rates of methylene blue by the thus prepared CdO samples are inversely proportional to the crystallite size.

 

 

 

 

 

1021

 

Preparation characterization and photocatalytic activity of silicon and sulfur codoped mesoporous titanium dioxide photocatalyst

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Zhongliang Shi, Xu Wang & Shuhua Yao*

 

 

 

Silicon and sulfur codoped mesoporous titanium dioxide photocatalysts have been synthesized. Higher degradation percentage of methyl blue has been achieved with these photocatalysts with 1 mol% silicon and 2 mol% sulfur codoped photocatalyst showing the highest photocatalytic activity.

 

 

 

 

 

 

 

 

1028

 

Structure and photocatalytic activity of bismuth tungstate nanoparticles synthesized by one-step solvothermal method

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Xiang-Hui Zhang

 

 

 

Bi2WO6 photocatalysts have been synthesized by solvothermal method in various solvents, viz., water, methanol and ethylene glycol. As compared to water and methanol, higher degradation of methylene blue has been achieved over the Bi2WO6 sample prepared in ethylene glycol, due to its appropriate energy band structure, small crystallite size, and high surface area.

 

 

 

 

 

 

1034

 

Estimation of Tb3+ by mellitic acid sensitized luminescence in methanol

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S Maji*, Satendra Kumar & K Sankaran

 

 

 

Mellitic acid sensitized luminescence of Tb3+ in methanol exhibits a strong emission which is about 500 times more intense than that observed in water. Under optimal conditions, the luminescence intensity exhibits excellent linear relationship in the concentration range of 5ื10-10–5ื10-8 M with a detection limit of 3ื10-11 M.

 

 

 

Notes

 

1041

 

Structural and magnetic characterization of nanocrystalline LaFeO3 synthesized by low temperature combustion technique using different fuels

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Suram Singh & Devinder Singh*

 

 

 

Synthesis of nanocrystalline LaFeO3 with fine particle size by combustion method in the absence of water or any other solvent is reported with urea or polyvinyl alcohol as combustion fuels. With urea, average grain size as fuel is smaller, while specific surface area is larger with polyvinyl alcohol. Both the phases show antiferromagnetic behavior and antiferromagnetic interactions are dominant in the phase synthesized by polyvinyl alcohol.
Anti-ferromagnetic behavior of the samples may be due to
super-exchange Fe3+–O2-–Fe3+ interactions.

 

 

 

 

1048

 

 

Guide to Authors

 

 

 

 

 

Authors for correspondence are indicated by (*)

 

 

 

 

 

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Indian Journal of Chemistry

Vol. 56A, October 2017, pp. 1007-1013

 

Electrodeposition of platinum-iridium nanoparticles on carbon
nanotubes and their electrocatalytic oxidation of glucose

Bohua Wua, *, Jiajin Zhua, Xue Lia, Ting Zhoub, Liqiu Maob & Shanxin Xionga

aCollege of Chemistry and Chemical Engineering, Xi’an University of Science & Technology, Xi'an, 710054, PR China

Email: wubohua2005@126.com

bNational & Local Joint Engineering Lab. for New Petro-Chemical Materials and Fine Utilization of Resources,
College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, PR China

Received 1 May 2017; revised and accepted 22 September 2017

Platinum-iridium (PtIr) nanoparticles (NPs) have been anchored on the surface of carbon nanotubes by potentiostatic electrodeposition in 0.5 M H2SO4+0.5 M glycerol aqueous solution. The surface and composition of the PtIr NPs/CNTs nanohybrids have been characterized by transmission electron microscopy and energy dispersive spectroscopy, respectively. The electrocatalytic properties of the PtIr NPs/CNTs catalysts for glucose oxidation have been investigated by cyclic voltammetry and chronoamperometry. The size of the PtIr NPs can be controlled from 3.0–7.0 nm by controlling the amount of Ir. In particular, the PtIr NPs has been optimized at 1:1 Pt/Ir atomic ratio. The as-prepared PtIr (1:1) NPs/CNTs catalysts possess unique properties including small size of PtIr NPs, excellent dispersion, high electrochemical active surface area and exhibit high activity towards glucose oxidation. For comparison, Pt NPs/CNTs catalysts have also been prepared under the same controlled procedure. In the absence of Ir, Pt NPs are also uniformly dispersed on the CNTs, and their average diameter is 4.0ฑ0.5 nm, close to that of PtIr NPs. Further, addition of Ir makes PtIr (1:1) NPs/CNTs catalysts superior to Pt NPs/CNTs catalysts in term of better long-term stability and higher catalytic efficiency of glucose oxidation. The PtIr (1:1) NPs/CNTs catalysts are proved to be promising anode catalysts for direct glucose fuel cells.

Keywords: Fuel cells, Electrocatalytic oxidation, Oxidation, Glucose oxidation, Electrodeposition, Anode catalysts, Carbon nanotubes, Platinum alloy, Iridium

 

Indian Journal of Chemistry

Vol. 56A, October 2017, pp. 1014-1020

 

Phthalate precursor mediated synthesis of cadmium oxide
nanoparticles and their photocatalytic application

Dattaprasad D Narulkar, Teena A Jalmi Gaude & Sunder N Dhuri*

aDepartment of Chemistry, Goa University, Taleigao Plateau, Goa 403206, India

Email: sndhuri@unigoa.ac.in

Received 8 June 2016; revised and accepted 28 September 2017

Cadmium oxide samples have been prepared by thermal decomposition of their precursors [Cd(pht)(H2O)] (1), [Cd(pht)(Im)(H2O)0.5] (2), [Cd(pht)(MeIm)] (3) and [Cd(pht)(bpy)(H2O)2] (4) respectively (pht = phthalate, Im = imidazole, MeIm = 2-methylimidazole, bpy = 2,2-bipyridine). Precursor 1 has been synthesized by a reaction of in situ generated disodium phthalate with cadmium acetate, while 2-4 were prepared by adding Im, MeIm and bpy respectively, to the solution of 1. All compounds are characterized by elemental analysis, infrared spectroscopy and thermal techniques (TG/DTA). The particle size of CdO nanoparticles ranges from 53–62 nm as evident by PXRD, SEM/ TEM studies. The band gap values for CdO samples lie in the range 1.95–1.98 eV. The photolytic degradation rates of methylene blue by CdO are inversely proportional to the crystallite sizes of CdO samples.

Keywords: Nanoparticles, Oxides, Cadmium oxide, Photocatalytic degradation, Dye degradation, Methylene blue, Thermogravimetry, Phthalate precursors

 

 

Indian Journal of Chemistry

Vol. 56A, October 2017, pp. 1021-1027

 

Preparation, characterization and photocatalytic activity of silicon
and sulfur codoped mesoporous titanium dioxide photocatalyst

Zhongliang Shi, Xu Wang & Shuhua Yao*

School of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang 110142, China

Email: ysh1997@163.com

Received 24 May 2017; revised and accepted 28 September 2017

A series of mesoporous titanium dioxide (MTiO2) photocatalysts codoped with silicon and sulfur has been prepared by a template method using tetraethyl orthosilicate, thiourea and tetrabutyl titanate (Ti(OC4H9)4) as precursors and Pluronic P123 as template. The photoabsorbance of the prepared photocatalysts has been measured by UV-vis diffusive reflectance spectroscopy and its microstructure characterized using scanning electron microscopy, diffraction (XRD) and N2 adsorption-desorption measurements. The microcrystal of the codoped photocatalyst consistest of anatase phase and is present in the form of almost spherical particle. The photocatalytic activity has been studied by photodegradation of methyl blue in aqueous solution under UV and visible light irradiation. The results show that the amount of dopants, silicon and sulfur, influence the photoactivity. The photocatalyst codoped with 1 mol% silicon and 2 mol% sulfur exhibites the highest photoactivity. The synergistic effect of silicon and sulfur codoping in improves the photocatalytic activity considerably.

Keywords: Photocatalysts activity, Mesoporous materials, Titanium dioxide, Silicon, Sulfur, Codoping, Doped catalyst

 

Indian Journal of Chemistry

Vol. 56A, October 2017, pp. 1028-1033

 

Structure and photocatalytic activity of bismuth tungstate
nanoparticles synthesized by one-step solvothermal
method

Xiang-Hui Zhang

Henan Key Laboratory of Electromagnetic Transformation and Detection, College of Physics
and Electronic Information
, Luoyang Normal University, Luoyang, 471934, PR China

Email: zxhlynu@163.com

Received 14 August 2017, revised and accepted 27 September 2017

Bi2WO6 has been synthesized by water, methanol or ethylene glycol assisted solvothermal method. The physical and photophysical properties of the as-prepared samples are characterized by XRD, UV-vis, SEM and BET surface area measurements. XRD results show orthorhombic Bi2WO6 with the average crystallite size of about 9.2 nm, obtained using ethylene glycol as the reaction solvent. By substituting ethylene glycol for deionized water or methanol as solvent, the size of Bi2WO6 increases. BET results indicate that the Bi2WO6 sample prepared in ethylene glycol has the largest surface area (56.5 m2 g–1). The photocatalytic activities of as-prepared samples have been evaluated by the degradation of methylene blue in an aqueous solution under visible light irradiation. The degradation ratio of MB over Bi2WO6 synthesized in ethylene glycol (97.1%) is much higher than that over Bi2WO6 synthesized in deionized water (82.8%) and methanol (50.0%) within 120 min. This may be attributed to its appropriate energy band structure, small crystallite size, and high surface area.

Keywords: Bismuth tungstate, Ethylene glycol, Methylene blue, Dye degradation, Solvothermal method

 

Indian Journal of Chemistry

Vol. 56A, October 2017, pp. 1034-1040

 

Estimation of Tb3+ by mellitic acid sensitized luminescence
in methanol

S Maji*, Satendra Kumar & K Sankaran

Materials Chemistry Division, Materials Chemistry and Metal Fuel Cycle Group

Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India

Email: siuli@igcar.gov.in

Received 5 July 2017; received and accepted 12 September 2017

Mellitic acid sensitized luminescence of Tb3+ in methanol exhibits a strong emission which is about 500 times more intense than that observed in water. Under optimal conditions, the luminescence intensity exhibits an excellent linear relationship in the concentration range of 5 ื 10-10–5 ื 10-8 M with a detection limit of 3 ื 10-11 M. The interferences due to other lanthanides have been examined and found to be tolerated up to about 100-fold excess and hence estimation of Tb3+ in the presence of excess of lanthanides is possible. This method has been applied to the estimation of Tb3+ in simulated rare earth and tap water samples and the result is comparable to the result obtained from ICP-MS. Mechanism of enhanced luminescence is also proposed. This is the first report where mellitic acid sensitized luminescence is applied for the estimation of Tb3+.

Keywords: Analytical chemistry, Luminescence, Rare earths, Lanthanides, Terbium, Mellitic acid

 

Indian Journal of Chemistry

Vol. 56A, October 2017, pp. 1041-1047

 

Structural and magnetic characterization of nanocrystalline
LaFeO3 synthesized bylow temperature combustion
technique using different fuels

Suram Singh & Devinder Singh*

Department of Chemistry, University of Jammu, Jammu 180 006, India

Email: drdssambyal@rediffmail.com

Synthesis of nanocrystalline LaFeO3 with fine particle size by a simple combustion method employing urea and polyvinyl alcohol as combustion fuels without using water or any other solvent is reported. Rietveld structural refinement analysis of the powder X-ray diffraction data indicates that LaFeO3 crystallizes in the orthorhombic perovskite structure with space group Pbnm. The values of unit cell volume and X-ray density of the samples remain almost constant, indicating the efficiency of the combustion method. The average grain size of LaFeO3 powders obtained with urea as a fuel is smaller, while the specific surface area is larger than that of the nanopowder obtained with polyvinyl alcohol. Both the phases show antiferromagnetic behavior and antiferromagnetic interactions are dominant in the phase synthesized by polyvinyl alcohol. Anti-ferromagnetic behavior of the samples may be due to super-exchange Fe3+–O2-–Fe3+ interactions.

Keywords: Nanomaterials, Perovskites, Orthoferrites, Oxides, Antiferromagnetic properties, Combustion method, Magnetic properties, Iron oxide, Lanthanum, Urea, Polyvinyl alcohol