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Papers by garima Dwivedi
International Journal of Research, 2017
Heterogeneous photocatalysis is a low-cost, sustainable and environment friendly advanced oxidati... more Heterogeneous photocatalysis is a low-cost, sustainable and environment friendly advanced oxidation process. It is a process in which highly oxidative OH* free radicals are produced due to the oxidation and reduction reactions on the semiconductor surface in the presence of ultraviolet light and oxygen. It aligns with the “zero” waste scheme in the wastewater industry and has the ability for the removal of persistent organic compounds and microorganism, present in air and water. Semiconductor photocatalyst material and photoreactor design are two important areas involved in this method for remediation of polluted water stream falls. By far, titania is known as the best photocatalyst as compared to others due to its inert nature and photo stability, but the post-recovery of fine photocatalyst particles after the treatment of contaminated water, still remains the challenge for commercialization of this process at industrial scale. The appropriate design of the photoreactor provides t...
An inexpensive polyaniline was synthesized by electrochemical polymerizat ion on conducting glass... more An inexpensive polyaniline was synthesized by electrochemical polymerizat ion on conducting glass as a platinum substitute for tri-iodide reduction on the conducting glass substrate, and natural sensitizers as a synthetic dyes replacement. Plant pigments such as chlorophyll, caroten oid, flavonoid, anthocyanin, betalains are present in natural sensitizers are responsible for light absorption and the charge injection to the conduction band of the semiconductor nanoparticles. The efficiencies of dye-sensitized solar cell (DSSC) with natural sensitizers and synthetic dye i.e. N719 with polyaniline as a counter electrode catalyst was compared.
TiO2 nanoparticles are well known for their photocatalytic activities of converting dyes present ... more TiO2 nanoparticles are well known for their photocatalytic activities of converting dyes present in the industrial effluent, into carbon dioxide and water. The photocatalytic process comprises of two steps: adsorption and the reaction. Adsorption of dye on TiO2 nanoparticles, being the first and important step is explored experimentally to study the equilibrium and kinetics in dark. Choosing methylene blue as a model dye, adsorption studies of it were carried out on commercially procured P-25 TiO2 nanoparticles (~21 nm). A pseudo-first order reaction equation is found to be matches well with the experimental data suggesting that adsorption of methylene blue on TiO2 nanoparticles is a surface controlled reaction step.
Inorganic Chemistry Communications
International Journal of Research, 2017
Heterogeneous photocatalysis is a low-cost, sustainable and environment friendly advanced oxidati... more Heterogeneous photocatalysis is a low-cost, sustainable and environment friendly advanced oxidation process. It is a process in which highly oxidative OH* free radicals are produced due to the oxidation and reduction reactions on the semiconductor surface in the presence of ultraviolet light and oxygen. It aligns with the “zero” waste scheme in the wastewater industry and has the ability for the removal of persistent organic compounds and microorganism, present in air and water. Semiconductor photocatalyst material and photoreactor design are two important areas involved in this method for remediation of polluted water stream falls. By far, titania is known as the best photocatalyst as compared to others due to its inert nature and photo stability, but the post-recovery of fine photocatalyst particles after the treatment of contaminated water, still remains the challenge for commercialization of this process at industrial scale. The appropriate design of the photoreactor provides t...
An inexpensive polyaniline was synthesized by electrochemical polymerizat ion on conducting glass... more An inexpensive polyaniline was synthesized by electrochemical polymerizat ion on conducting glass as a platinum substitute for tri-iodide reduction on the conducting glass substrate, and natural sensitizers as a synthetic dyes replacement. Plant pigments such as chlorophyll, caroten oid, flavonoid, anthocyanin, betalains are present in natural sensitizers are responsible for light absorption and the charge injection to the conduction band of the semiconductor nanoparticles. The efficiencies of dye-sensitized solar cell (DSSC) with natural sensitizers and synthetic dye i.e. N719 with polyaniline as a counter electrode catalyst was compared.
TiO2 nanoparticles are well known for their photocatalytic activities of converting dyes present ... more TiO2 nanoparticles are well known for their photocatalytic activities of converting dyes present in the industrial effluent, into carbon dioxide and water. The photocatalytic process comprises of two steps: adsorption and the reaction. Adsorption of dye on TiO2 nanoparticles, being the first and important step is explored experimentally to study the equilibrium and kinetics in dark. Choosing methylene blue as a model dye, adsorption studies of it were carried out on commercially procured P-25 TiO2 nanoparticles (~21 nm). A pseudo-first order reaction equation is found to be matches well with the experimental data suggesting that adsorption of methylene blue on TiO2 nanoparticles is a surface controlled reaction step.
Inorganic Chemistry Communications