Rohit Shrivastav - Academia.edu (original) (raw)

Papers by Rohit Shrivastav

Dietary (human) intake of fluoride (F) largely through consumption of agricultural produce grown ... more Dietary (human) intake of fluoride (F) largely through consumption of agricultural produce grown in F contaminated environment, has recently been viewed as an important cause for several F related health problems in many parts of the world. Being a non-essential element, F is usually taken up by plants through passive uptake -a process which is dominantly diffusion controlled. Still very little is known regarding F diffusion in soil. In present study, diffusion of F in the alluvial soil (Entisol) of Dayalbagh (Agra) has been investigated as a function of soil water content (θ θ) and F concentration gradient. The data on F diffusion coefficients were recorded by determining the F concentration profile in horizontally incubated and homogenized soil columns, under varied experimental conditions (θ θ = 0.12-0.25 cm cm -3 , pH = 7.3 ± 0.2, incubation time (t) = 96-384 h, temperature = 303 ± 1.2 K.

PharmacoEconomics & Outcomes News, 2013

The photoelectrochemical properties of Cd-doped titanium oxide thin film, prepared by sol–gel met... more The photoelectrochemical properties of Cd-doped titanium oxide thin film, prepared by sol–gel method, were investigated as a function of doping concentration and film thickness (number of coatings). Doping with 1.0 at% Cd resulted in best photoresponse. Further increase or ...

Science of The Total Environment, 1998

Up to now, geochemical monitoring of atmospheric heavy metal pollution has been limited to the us... more Up to now, geochemical monitoring of atmospheric heavy metal pollution has been limited to the use of peat, ice deposits and aquatic sediments as sample types. These systems are open, dynamic and easily affected by climatic variations. In a recent report, Shrivastav et al. (Environ Mon Ass 1996;40:271–278) have suggested the use of bricks as a geochemical monitor of heavy

Advanced Materials Research, 2009

... 9+ Irradiated Nanostructured Thin Films of ZnO for Solar-Hydrogen Generation via Splitting of... more ... 9+ Irradiated Nanostructured Thin Films of ZnO for Solar-Hydrogen Generation via Splitting of Water Monika Gupta 1, a , Jaya Shrivastava 2, b , Vidhika Sharma 3, c , Anjana Solanki 4, d , AP Singh 5, e , VR Satsangi 6, f , S. Dass 7, g and Rohit Shrivastav 8, h,* ...

Synthesis of advanced ceramic materials with improved microstructure, finding widespread applicat... more Synthesis of advanced ceramic materials with improved microstructure, finding widespread applications as photocatalysts, is a challenge before the chemists. This communication describes a wet chemical method based upon sol-gel technique, which is simple, fast and can be effectively used for the synthesis of doped metal- oxide semiconductors, which constitute a widely used class of photocatalyst s. The method has been

Thin Solid Films, 2005

... Yatendra S. Chaudhary a , 1 , Saif A. Khan d , Rohit Shrivastav a , Vibha R. Satsangi b , Sat... more ... Yatendra S. Chaudhary a , 1 , Saif A. Khan d , Rohit Shrivastav a , Vibha R. Satsangi b , Satya Prakash a , Umesh K. Tiwari e , DK Avasthi d , Navendu Goswami c and Sahab Dass a , Corresponding Author Contact Information , E-mail The Corresponding Author. ...

International Journal of Photoenergy, 2007

Photoelectrochemical response of thin films of α-Fe 2 O 3 , Zn doped α-Fe 2 O 3 , and Zn dots dep... more Photoelectrochemical response of thin films of α-Fe 2 O 3 , Zn doped α-Fe 2 O 3 , and Zn dots deposited on doped α-Fe 2 O 3 prepared by spray pyrolysis has been studied. Samples of Zn dots were prepared using thermal evaporation method by evaporating Zn through a mesh having pore diameter of 0.7 mm. The presence of Zn-dotted islands on doped α-Fe 2 O 3 surface exhibited significantly large photocurrent density as compared to other samples. An optimum thickness of Zn dots ∼230Å is found to give enhanced photoresponse. The observed results are analyzed with the help of estimated values of resistivity, band gap, flatband potential, and donor density.

Solar Hydrogen and Nanotechnology III, 2008

Modification in the properties of material by swift heavy ion irradiation is an interesting area ... more Modification in the properties of material by swift heavy ion irradiation is an interesting area of research. It provides the researchers a new dimension of introducing desired changes to the behaviour of the material, which largely influence their PEC properties also. This ...

Bulletin of Materials Science, 2009

Nanostructured zinc oxide thin films (ZnO) were prepared on conducting glass support (SnO2: F ove... more Nanostructured zinc oxide thin films (ZnO) were prepared on conducting glass support (SnO2: F overlayer) via sol-gel starting from colloidal solution of zinc acetate 2-hydrate in ethanol and 2-methoxy ethanol. Films were obtained by spin coating at 1500 rpm under room conditions (temperature, 28–35°C) and were subsequently sintered in air at three different temperatures (400, 500 and 600°C). The evolution

Toxicological & Environmental Chemistry, 2002

... MEETU AGARWAL, KAVITA RAI, ROHIT SHRIVASTAV and SAHAB DASS* Department of Chemistry, Faculty ... more ... MEETU AGARWAL, KAVITA RAI, ROHIT SHRIVASTAV and SAHAB DASS* Department of Chemistry, Faculty of Science, Dayalbagh Educational Institute, Dayalbagh, Agra 282 005, India (Received 2 May 2001; Revised 14 January 2002; In final form 18 January 2002) ...

The Journal of Physical Chemistry C, 2010

... Aadesh P. Singh , Saroj Kumari , A. Tripathi § , F. Singh § , Karen J. Gaskell ,Rohit Shr... more ... Aadesh P. Singh , Saroj Kumari , A. Tripathi § , F. Singh § , Karen J. Gaskell ,Rohit Shrivastav , Sahab Dass , SH Ehrman and Vibha R. Satsangi* . Department of Physics &amp;amp;amp;amp;amp;amp;amp; Computer Science, Department of Chemistry ...

Science of The Total Environment, 1997

Leachates of Cr and Ni from stainless steel utensils viz., frying pans, bowls and tumblers, have ... more Leachates of Cr and Ni from stainless steel utensils viz., frying pans, bowls and tumblers, have been investigated, by exposing the utensils to decinormal solutions of citric, tartaric and lactic acids and to some common Indian drinks. A comparison of observed results indicate that the complexation of metal ions with organic acid anions is most vital and metal leaching is largely a function of the availability of free anions. The intake of Cr and Ni by human beings has also been calculated. 0 1997 Elsevier Science B.V.

Journal of Physics D: Applied Physics, 2009

... 9+ ions irradiation Aadesh P Singh1, Saroj Kumari1, Rohit Shrivastav2, Sahab Dass2 and Vibha ... more ... 9+ ions irradiation Aadesh P Singh1, Saroj Kumari1, Rohit Shrivastav2, Sahab Dass2 and Vibha R Satsangi1,3 ... Chem. B 109 13685 [8] Saroj K, Singh AP, Tripathi C, Chauhan D, Dass S, Shrivastav R, Gupta V, Sreenivas K and Satsangi VR 2007 Int. ...

Journal of Controlled Release, 2004

The effect of 170 MeV Au 13þ irradiation on photoelectrochemical (PEC) and structural properties ... more The effect of 170 MeV Au 13þ irradiation on photoelectrochemical (PEC) and structural properties of CuO thin films has been investigated. The X-ray diffractograms of post-irradiated CuO thin films showed diffused nature towards higher theta value with the appearance of crystalline peaks, indicative of some randomization taking place at higher fluence, i.e. 10 13 ions cm À2 . While, upon irradiation, the size of particles/grains decreased, the band gap energy also marginally shifted. ERDA analysis indicated no change in stoichiometry of thin films even at higher fluence. The observed decrease in photoelectrochemical response, upon irradiation, has been attributed to the creation of greater number of kink sites/dislocations, which seemingly act as recombination centers for photogenerated charge carriers.

Journal of Cleaner Production, 2003

International Journal of Hydrogen Energy, 2008

Iron doping TiO 2 Sol-gel a b s t r a c t This paper describes the photoelectrochemical studies o... more Iron doping TiO 2 Sol-gel a b s t r a c t This paper describes the photoelectrochemical studies on nanostructured iron doped titanium dioxide (TiO 2 ) thin films prepared by sol-gel spin coating method. Thin films were characterized by X-ray diffraction, Raman spectroscopy, spectral absorbance, atomic force microscopy and photoelectrochemical (PEC) measurements. XRD study shows that the films were polycrystalline with the photoactive anatase phase of TiO 2 . Doping of Fe in TiO 2 resulted in a shift of absorption edge towards the visible region of solar spectrum. The observed bandgap energy decreased from 3.3 to 2.89 eV on increasing the doping concentration upto 0.2 at.% Fe. 0.2 at.% Fe doped TiO 2 exhibited the highest photocurrent density, w0.92 mA/cm 2 at zero external bias. Flatband potential and donor density determined from the Mott-Schottky plots were found to vary with doping concentration from À0.54 to À0.

International Journal of Hydrogen Energy, 2011

Water splitting

International Journal of Hydrogen Energy, 2007