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Your search keyword '"Pramod Kumar Rai"' showing total 5 results
Start Over Author "Pramod Kumar Rai" Publisher royal society of chemistry (rsc)
5 results on '"Pramod Kumar Rai"'

3. A comprehensive estimate of the aggregation and transport of nSiO2 in static and dynamic aqueous systems

Author

Debayan Ghosh, Soupam Das, Vikas Kumar Gahlot, Mrudula Pulimi, Shalini Anand, N. Chandrasekaran, Pramod Kumar Rai, and Amitava Mukherjee

Subjects
Public Health, Environmental and Occupational Health, Environmental Chemistry, General Medicine, Management, Monitoring, Policy and Law
Abstract

Influence of several physicochemical factors on the sedimentation and transport of nSiO2 in the aquatic environment.

Published
2022

4. Surfactant-free one-pot synthesis of CeO2, TiO2 and Ti@Ce oxide nanoparticles for the ultrafast removal of Cr(<scp>vi</scp>) from aqueous media

Author

Pramod Kumar Rai, Rakesh Kumar, and Prashant Kumar Mishra

Subjects
Cerium oxide, Anatase, Materials science, Oxide, Nanoparticle, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Titanium oxide, chemistry.chemical_compound, Adsorption, chemistry, Rutile, Monolayer, General Materials Science, 0210 nano-technology, Nuclear chemistry
Abstract

Cerium oxide (CeO2), titanium oxide (TiO2) and titanium oxide impregnated with cerium oxide (Ti@Ce oxide) nanoparticles were synthesized using a simple one-pot surfactant-free method. The synthesized adsorbents were tested against the removal of Cr(VI) from aqueous medium. Comprehensive characterization methods like BET, XRD, SEM, EDAX, HR-TEM, SAED, HR-XPS and FT-IR were performed at different stages of the adsorption process and synthesis. A N2-BET study revealed the large surface area (268 m2 g−1) and pore size (6.8 nm) of CeO2 nanoparticles, which decreased after impregnation of titania. An XRD study demonstrated the phase transformation of TiO2 from the anatase phase to the rutile phase after the impregnation with CeO2 by lowering the phase transformation temperature from >550 °C to 400 °C. Ti0.3@Ce0.7 oxide nanoparticles showed 81% removal of Cr(VI) within 2.5 min of initiating the adsorption process while more than 92% removal of Cr(VI) was achieved within 10 min of adsorption. A HR-XPS study indicated the dual oxidation states of ceria and titania metals, which helped to convert the more toxic Cr(VI) ions to less toxic Cr(III) ions during the adsorption process. The adsorption pattern depicted the monolayer behavior of Cr(VI) obeying the Redlich–Peterson isotherm and followed pseudo second-order kinetics. An intraparticle diffusion model disclosed the surface and pore resistance diffusion of Cr(VI) on the surface of adsorbents.

Published
2018

5. Aero-gel assisted synthesis of anatase TiO2 nanoparticles for humidity sensing application

Author

Jasbir Sangwan, Vijay K. Tomer, Prashant Kumar Mishra, Pramod Kumar Rai, Vijay Kiran, Ekta Poonia, and Rakesh Kumar

Subjects
Anatase, Materials science, Tio2 nanoparticles, Humidity, 02 engineering and technology, Fast recovery, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Inorganic Chemistry, Hysteresis, Chemical engineering, Phase (matter), 0210 nano-technology, Porosity
Abstract

Aero-gel based one-pot synthesis of anatase phase TiO2 nanoparticles having a high surface area of 125 m2 g−1 has been reported in this work. The humidity sensing perfomance of the obtained porous TiO2 nanoparticles exhibits a quick response (2 s) and fast recovery (1.5 s), negligible hysteresis (

Published
2018

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