Kānpur, India
Kānpur, India

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Kalal S.,University of Rajasthan | Chauhan N.P.S.,BNPG College | Pandey A.,University of Rajasthan | Ameta R.,Pacific University at Udaipur | Punjabi P.B.,University of Rajasthan
Indian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry | Year: 2015

Visible light-based photo-Fenton-like catalytic performance of Cu3V2 (OH)2O7.2H2O is investigated using methylene blue as the target pollutant. Specific surface area, structure, and particle size distribution of the catalysts and its components are investigated by techniques such as standard Brunauer-Emmett-Teller isotherms, X-ray diffraction, scanning electron microscope and energy dispersive X-ray spectroscopy Under optimized conditions in the Cu3V2 (OH)2O7.2H2O-H2O2-visible light system, the degradation efficiency and the pseudo first-order rate constant are found to be 69.07% and 4.23×10-4 s-1 respectively. The new bifunctional material is found to be a promising material for use as a Fentonlike catalyst for the degradation of organic contaminant in waste water. Copper and vanadium leaching from the catalyst is almost negligible, which demonstrates the stability of the catalyst; the catalyst is very stable and can be reused for at least four cycles when operated under near neutral pH.


Singh S.K.,Allahabad University | Yadav B.B.,Allahabad University | Srivastava M.,CMP College | Shukla P.K.,BNPG College | Srivastava G.K.,Allahabad University
Plant Systematics and Evolution | Year: 2014

The present study provides a comparative morphological analysis of spikes in different Indian species of Selaginella. The salient features of spikes including their types and also the shape and margin of sporophylls of the closely related taxa are characteristically useful in taxonomic delineation. We have used the term Leaf-flap, for the first time, and the Sporophyll-pteryx to denote the occurrence of vertical/oblique projection on the dorsal surface of leaf and sporophyll, respectively. The shape and colour of both mega- and micro-sporangia are also helpful in taxonomy; however, their size is not much significant as these are variable within the same spike of the species. A new pattern of sporangial distribution is being reported for the first time in the spike of S. plana (Desv. ex Poir.) Hieron. © 2013 Springer-Verlag Wien.


Singh S.K.,Allahabad University | Yadav B.B.,Allahabad University | Srivastava M.,CMP College | Shukla P.K.,BNPG College | Srivastava G.K.,Allahabad University
Grana | Year: 2014

Twenty Indian species of the lycopod genus Selaginella are studied using both light microscopy and scanning electron microscopy to resolve the variability in the number of megaspores per megasporangium and size, surface ornamentation and micro-sculpture of the megaspores. Comparisons between the new results and previous findings suggest that spore morphology and size are consistent for some species but variable within others. © 2014 © 2014 Collegium Palynologicum Scandinavicum.

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