Sheeba Narayanan

Sheeba Narayanan
National Institute of Technology Tiruchirappalli | nit-t · Department of Chemical Engineering

PhD

About

53
Publications
10,764
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1,983
Citations
Additional affiliations
May 2006 - November 2016
National Institute of Technology Tiruchirappalli
Position
  • Professor (Associate)

Publications

Publications (53)
Article
Biochar is a highly rich carbonaceous material, which when applied to soil renders numerous benefits to plants and the environment. The role of biochar in agriculture is expected to expand rapidly as the need to protect the climate, manage organic waste, and produce food has risen significantly. Hence, continuous research on the production and appl...
Article
Banana starch, with its nutritional properties, opens new opportunities for the food industry, which is seeking new starch sources to fulfil rising demand. Herein, physico-chemical, and functional properties of banana starches isolated from dessert, plantain, and cooking cultivars were investigated. Starch yield was higher in Popoulu (30.58%) and M...
Article
Full-text available
A facile and green method for synthesizing Zinc Oxide nanoparticles (ZnO NPs) was successfully carried out using unutilized sweet lime; i.e., Citrus Limetta rind pulp (U-CLRP) extract. The structural, morphological and optical studies were elucidated to confirm the crystallinity, size, and shape of the synthesized NPs. Copper doping on ZnO NPs (CZn...
Chapter
Leather industries have a predominant place in the economic growth of various countries and have been a substantial contributor to export and employment potential. However, due to environmental impacts and water consumption, they are categorized as red-category industries, and as a result of the complex nature of their wastewater, currently availab...
Article
The structural amendment of a 2D-π-conjugated polymeric material (g-C3N4) has been done by a non-metal, i.e.boron to extend its visible light absorption. The boron atom provides a vacant p orbital to relocateπbonds insidethe adjacent atomic rings, which annexes the electron mobility in the g-C3N4sheets and thus obstructs therecombination rate along...
Chapter
The significant upward rise in atmospheric CO2 level through combustion of fossil fuel, deforestation, and human activates could contribute to severe environmental issues like greenhouse effect and climate change. Conversion of CO2 into chemical fuels or hydrocarbons is an effective way for mitigating the level of CO2 in the atmosphere, producing v...
Article
The structural framework of graphitic carbon nitride (g-C3N4) was tuned with Zinc Aluminium layer double hydroxide (ZnAl-LDH), and its photocatalytic activity was investigated through solar light assisted phenol degradation of real effluent. The modified g-C3N4 (70%g-C3N4/ZnAl-LDH) possess more efficient inhibition of electron and hole pairs result...
Article
Full-text available
Solar-light-driven carbon-based photocatalysts have been widely used for CO2 conversion reaction. In this work, silver iodide (AgI)-decorated 2D structure graphitic carbon nitride (GCN) composite was prepared using nitrogen-rich melamine precursor and the characterization results reveal that the mixture of hexagonal wurtzite and cubic phases of β,γ...
Article
In this study, the structural distortion of graphitic carbon nitride (g-C 3 N 4 ) has been done through potassium salt tempting towards an extended optical absorbance. Optical and morphological studies affirm that the potassium doping stimulate n − π ∗ electronic transition ascribing towards a diminished charge recombination, high conduction band e...
Article
Structural modification of graphitic carbon nitride (g-C3N4) by addition of sodium salt has been investigated for solar light-driven photocatalysis. The results from optical study indicates that the incorporation of sodium ions decreases band gap energy along with upward shifts of conduction and valence band. However, no substantial increment in su...
Article
This study mainly focuses on the photocatalytic and antimicrobial properties of silver iodide supported graphitic carbon nitride (AgI@g-C3N4) composite. AgI@g-C3N4 composite was obtained through modified deposition-precipitation method and the photocatalytic performance efficiency of the synthesized AgI@g-C3N4 composite was evaluated for degradatio...
Article
This study mainly focuses on the photocatalytic and antimicrobial properties of silver iodide supported graphitic carbon nitride ([email protected]3N4) composite. [email protected]3N4 composite was obtained through modified deposition-precipitation method and the photocatalytic performance efficiency of the synthesized [email protected]3N4 composit...
Article
This work aims to implement the environmental application of nanotechnology in terms of semiconductor-based photocatalysis to treat real tannery effluent. In this context, g-C3N4 prepared by melamine pyrolysis was added with TiO2 at different weight percentage to form TiO2/g-C3N4 nanocomposites, these composites were characterized and based on the...
Article
A direct Z-scheme AgCl@g-C3N4 composite with different ratios of AgCl loaded on g-C3N4 was constructed through modified deposition-precipitation method and as prepared composite was well characterized. The photocatalytic performance efficiency of AgCl@g-C3N4 composite was evaluated for the reduction of CO2 in an aqueous medium under visible light i...
Article
Full-text available
As coals are fast depleting, suitable means of substituting coal need to be explored. In this work, a feasibility study of co-firing lignite with char was investigated. Some locally abundant biomass were slow pyrolyzed. The pyrolyzed chars were characterized and their fuel properties were compared with that of Neyveli lignite. The study indicated t...
Article
Full-text available
This study investigates the effect of controlling parameters of slow pyrolysis and steam gasification on the generation of hydrogen. Some native biomass wastes were first slow pyrolyzed and generated chars were then steam gasified to generate hydrogen. In slow pyrolysis, parameters such as temperature, residence time and particle size were optimize...
Article
Full-text available
As coal is fast depleting, suitable means of substituting coal need to be explored. In this work, a feasibility study of co-firing lignite with char was investigated. Some locally abundant biomasses were slow pyrolysed. The pyrolysed chars were characterized and their fuel properties were compared with that of Neyveli lignite. The study indicated t...
Article
Zinc oxide (ZnO) hybridized with graphitic carbon nitride (g-C3N4) composite was prepared via one step calcination method and well characterized using various physiochemical techniques. The prepared composite exhibits excellent photocatalytic activity and stability for decolorization of methylene blue (MB) dye solution under visible light irradiati...
Article
Full-text available
Thermochemical and biochemical routes are the two potential energy recovery modes from biomass. Irrespective of the methods employed, a better understanding of biomass fuels is essential as it projects storage, handling, and transportation issues. Knowledge on the properties of biomass also helps in the design of process equipment, prediction of pr...
Article
Full-text available
In this work, the effect of temperature on the char yield of untreated rice husk, cellulose removed (hemicellulose + lignin), hemicellulose removed (cellulose + lignin), and lignin removed (cellulose + hemicellulose) is investigated. The work compares the performance of acid and alkaline hydrolysis in the context of lignin removal as well. The effe...
Article
The present study was carried out to examine modified bagasse and rice straw as absorbents for the removal of emulsified oil by a microwave-assisted technique. The raw adsorbents were chemically modified with sodium hydroxide and surfactant solution for better adsorption of oil. The surface modification was confirmed through Fourier transform infra...
Article
The present work on microwave pyrolysis of bagasse aims at maximizing the bio-oil and gas yield by optimizing reaction time, biomass to microwave absorber ratio, and microwave input power. Further, the performance of two microwave absorbers, glycerol and char, are compared. Experiments are conducted with varying: contact time (5, 10, 20, 30, and 60...
Article
Composting can be used to break down the complex biomass components which can influence slow pyrolysis products. In this work, the effect of composting on slow pyrolysis products of rice husk and wheat husk at different temperatures is investigated. It was found that in rice husk, composting yielded a 2.63–16.33% increase in char yield. In wheat hu...
Article
Full-text available
Utility and industrial steam generators in India are designed to burn coal for generating electricity, due to coal availability and economy. Rapid increase in coal-fired power projects increased the gap in demand and supply and therefore necessitated using available coals rather than plant design coal. Studies in different capacity boilers using co...
Article
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Photovoltaic cells are prone to thermal degradation as surface temperature exceeds critical value. Temperature reduction is one of the options for efficiency improvement. An attempt is made to analyze the cooling effect on temperature drop. At different depths and for various flow rates of water in underwater environment, the best performance is ob...
Article
Lignin, cellulose and hemicellulose are the major components of biomass. The chemical reactivities of the biomass are affected by the difference in chemical structures making the knowledge of their composition, essential to predict the efficiency of the biomass conversion process for utilizing bio-energy, which is of immense importance for successf...
Article
The present work aims at improving the generation of H2 from sugarcane bagasse in steam gasification process by incorporating slow pyrolysis technique. As a bench scale study, slow pyrolysis of sugarcane bagasse is performed at various pyrolysis temperature (350, 400, 450, 500 and 550 °C) and feed particle size (90<DP <212, 212< DP <355, 355<DP <50...
Article
Full-text available
The comparative performance of a solar still and a solar still-flat plate collector system has been studied for the actual environmental conditions of Trichy, Tamilnadu, as a measure to improve the efficiency of the solar still. Performance of a solar still with fresh tap water and saline water has been studied followed by a combined solar still-fl...
Article
Hydrogen, the inevitable fuel of the future, can be generated from biomass through promising thermochemical methods. Modern-day thermochemical methods of hydrogen generation include fast pyrolysis followed by steam reforming of bio-oil, supercritical water gasification and steam gasification. Apart from the aforementioned methods, a novice techniqu...
Article
Steam gasification is considered one of the most effective and efficient techniques of generating hydrogen from biomass. Of all the thermochemical processes, steam gasification offers the highest stoichiometric yield of hydrogen. There are several factors which influence the yield of hydrogen in steam gasification. Some of the prominent factors are...
Article
Full-text available
The purpose of this study is to investigate the potential use of biomass-based adsorbents, such as sugarcane bagasse, sawdust, and neem leaf, for the removal of malachite green from simulated and real effluent. The adsorbents prepared from bagasse are pretreated with formaldehyde, sulfuric acid, and phosphoric acid to improve the surface properties...
Article
In this work, thermogravimetric analysis is carried out on four different biomass samples such as bagasse, coir–pith, groundnut shell and casuarina leaves to study their thermal behaviour. Analysis is put through in an inert nitrogen atmosphere from ambient temperature to 800°C at a heating rate of 10°C/min. Three reaction zones corresponding to de...
Article
The photodegradation of distillery effluent has been studied for removal of colour and COD reduction in the presence of solar radiation. The influence of experimental parameters such as H2O2 concentration dosage, effluent COD concentration, TiO2 catalyst and pH on colour and COD removal efficiency through solar photochemical process has been invest...
Article
The gasification characteristics of coir pith are studied in a circulating fluidized bed gasifier using air as the gasifying medium. The effect of various parameters such as temperature, Equivalence Ratio (ER), and Oxygen/Carbon ratio (O/C) on gas yield, gas composition, gas heating value, carbon conversion, cold gas and overall thermal efficiency...
Article
Solar water heating system proves to be an effective technology for converting solar energy into thermal energy. The efficiency of solar thermal conversion is around 70% when compared to solar electrical direct conversion system which has an efficiency of only 17%. Hence solar water heaters play a vital role in domestic as well as industrial sector...
Article
Experiments has been carried out to estimate the performance, emission and combustion characteristics of a single cylinder; four stroke variable compression ratio multi fuel engine fuelled with waste cooking oil methyl ester and its blends with standard diesel. Tests has been conducted using the fuel blends of 20%, 40%, 60% and 80% biodiesel with s...
Article
Full-text available
The decomposition behavior of biomass when subjected to thermal stress is different for each kind of biomass. Modeling a pyrolysis or gasification process is complex because the mechanism of decomposition is highly dependent on its mass loss characteristics. The decomposition behavior of coir pith using thermogravimetric analysis is studied for hea...
Article
Experimental investigation of heat transfer, friction factor and thermal performance of twisted tape solar water heater with various twist ratios has been conducted and the results are compared with plain tube collector for the same operating conditions with Reynolds number varied from 3000 to 23,000. Experimental data from plain tube collector is...
Article
Experimental investigation of heat transfer and friction factor characteristics of thermosyphon solar water heater with full length Left–Right twist, twist fitted with rod and spacer at the trailing edge for lengths of 100, 200 and 300mm for twist ratio 3 and 5 has been studied. The experimental data for plain tube collector has been compared with...
Article
Experimental investigation of heat transfer, friction factor and thermal performance of thermosyphon solar water heater system fitted with helical twisted tape of various twist ratios has been performed and presented. The helical twisted tape induces swirl flow inside the riser tubes, which increases the heat transfer and pressure drop. The empiric...
Article
The gasification characteristics of coir pith are studied in a circulating fluidized bed gasifier using air as the gasifying medium. The effect of various parameters such as temperature, Equivalence Ratio (ER), and Oxygen/Carbon ratio (O/C) on gas yield, gas composition, gas heating value, carbon conversion, cold gas and overall thermal efficiency...
Article
Experimental investigation of heat transfer and friction factor characteristics of thermosyphon solar water heater system with full- length twist, twist fitted with rod and spacer fitted at the trailing edge for lengths of 100, 200 and 300 mm for twist ratio 3 and 5 has been carried out and compared with plain tube collector for the same operating...
Article
Experimental studies on tubes fitted with Left-Right twisted tape inserts of various twist ratios to enhance the convective heat transfer rate are studied for thermosyphon solar water heater system. The swirl flow is induced by Left-Right twisted tape in clockwise and counterclockwise direction inside the riser tube which enhances the heat transfer...
Article
Gasification of biomass offers the best possible solution for the conversion of biomass to useful energy in an eco friendly manner, because no new addition of carbon dioxide is generated while burning biomass. Fluidization characteristics of a circulating fluidizing bed gasifier have been experimented with varying mixing ratios of biomass (coir pit...
Article
Full-text available
Inclined solar water distillation systems (ISWDS), one with bare plate and the other with black cloth wick are designed and tested under actual environmental conditions of Trichy, Tamilnadu, India. In basin type solar still systems, the feed water falls down on the absorber plate and fresh water and hot water are produced simultaneously. In the inc...

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Projects (4)