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Xu H.-Y.,Harbin University of Science and Technology | Prasad M.,CSIR - Regional Research Laboratory | Wang P.,Harbin Institute of Technology
Bulletin of the Korean Chemical Society | Year: 2010

Schorl modified by H 2SO 4 has been successfully developed to enhance schorl-catalyzed Fenton-like reaction for removal of phenol in an aqueous solution. The phenol removal percentage can be increased from 4% to 100% by the system of modified schorl and H 2O 2. Batch experiments indicate that the percent increases in removal of phenol by increasing the dosage of catalyst, temperature and initial concentration of H 2O 2. The results of XRD, FT-IR and SEM suggest that no new phases are formed after removal of phenol by modified schorl. ICP-AES results reveal that more dissolution of iron results in higher catalytic oxidant activity in the system of modified schorl and H 2O 2. Besides minor adsorption, mineralcatalyzed Fenton-like reaction governs the process. Source


Biswas S.,Indian Institute of Science | Suwas S.,Indian Institute of Science | Sikand R.,National Physical Laboratory India | Gupta A.K.,CSIR - Regional Research Laboratory
Materials Science and Engineering A | Year: 2011

The evolution of microstructure and texture during extrusion of pure magnesium and its single phase alloy AM30 has been studied experimentally as well as by crystal plasticity simulation. Microstructure and micro-texture were characterized by electron back scattered diffraction (EBSD), bulk-texture was measured using X-ray diffraction and deformation texture simulations were carried out using visco-plastic self consistent (VPSC) model. In spite of clear indications of the occurrence of dynamic recrystallization (DRX), simulations were able to reproduce the experimental textures successfully. This was attributed to the fact that the textures were c-type fibers with their axis of rotation parallel to the c-axis and DRX leads to simply rotate the texture around the c-axis. © 2011 Elsevier B.V. Source


Xu H.,Harbin University of Science and Technology | Prasad M.,CSIR - Regional Research Laboratory | Qi S.,Harbin University of Science and Technology | Li Y.,Harbin University of Science and Technology
Science China Technological Sciences | Year: 2010

Dyeing wastewater containing methyl orange (MO) could be effectively discolored by schorl-catalyzed Fenton-like system. Experimental results indicated that the MO discoloration ratios could be increased by increasing schorl dosage, temperature, initial H2O2 concentration, and by decreasing solution pH. When the raw schorl and the schorl samples sintered at 750°C, 850°C, 950°C and 1050°C were used as catalyst in Fenton-like system, the MO discoloration ratios obtained were 82%, 31%, 30%, 31% and 7%, respectively. XRD results showed that samples sintered at 750°C, 850°C and 950°C had no change in structure and still held the crystal structure of schorl and quartz, but, the content of schorl crystal decreased. Whereas, schorl crystal completely disappeared in the sample sintered at 1050°C and two new crystal phases of hematite and spinel were formed, which resulted in disappearance of the spontaneous 'electrostatic poles'. Hence, it was inferred that the electrostatic field of schorl crystal could enhance the MO discoloration by schorl-catalyzed Fenton-like reaction. © 2010 Science China Press and Springer-Verlag Berlin Heidelberg. Source


Mary G.,Polymer Research Laboratory | Bajpai S.K.,Polymer Research Laboratory | Chand N.,CSIR - Regional Research Laboratory
Journal of Natural Fibers | Year: 2010

Apart from exhibiting excellent properties such as biocompatibility, feeling like human skin, sweat absorptivity, and comfort, cotton fabric also creates a suitable environment for microorganisms to grow because of their tendency to absorb moisture. Hence, in order to impart antibacterial properties to cotton fibers, in the current study microorganisms have been graft copolymerized with N-vinyl-2- pyrrolidone and acrylamide to produce micrometer-sized graft layer on the cotton fiber. The fibers have been loaded with Zn(II) ions to impart antibacterial character to them. The biocidal action of Zn(II) has been investigated as a function of percent grafting of polymeric chains on fibers and the concentration of Zn(II) ions in the immersion media, using zone inhibition method. Growth rates of bacterial colonies have been found to be appreciably low in the presence of Zn(II)-loaded grafted fibers. However, the grafting of cotton fibers has been found to decrease the mechanical strength of the resulting fibers. © Taylor & Francis Group, LLC. Source


Rout P.K.,CSIR - Central Electrochemical Research Institute | Rao Y.R.,Adityahridayam | Jena K.S.,CSIR - Regional Research Laboratory | Sahoo D.,CSIR - Central Electrochemical Research Institute | Ali S.,Hamdard University
Journal of Food Science and Technology | Year: 2014

Simarouba glauca DC is a tree of the family Simaroubaceae, which grows well up to 1,000 m above sea level in all types of well-drained soils (pH 5.5 to 8.0) and in places with 250 to 2,500 mm annual rainfall. The seed oil has been extracted both by mechanical expelling and solvent extraction. The fatty acid composition and iodine value of the oil indicate that it possesses saturated (40.8-42.6%), monounsaturated (52.9-55.0%), and polyunsaturated (2.5-3.4%) fatty acid in ratios close to that of palm oil. These characteristics are suitable for its use as edible oil. Acute oral toxicity and safety evaluation in a 13-week feeding trial on albino rats showed that the oil is comparable to groundnut oil in all the parameters. © 2012 Association of Food Scientists & Technologists (India). Source

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