Dhanapati Deka

Dhanapati Deka
Tezpur University · Department of Energy

Ph.D

About

78
Publications
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2,097
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Publications

Publications (78)
Article
Biodiesel production from cheap and available feedstocks using agriculture waste as catalysts is success strategy towards making biodiesel more commercially competitive. Hence, in the current study, a green heterogeneous catalyst (CSPL) derived from the waste sweet potato leaves was synthesized and employed for biodiesel production using Scenedesmu...
Article
Biodiesel is considered a promising alternative to conventional fuels in response to increasing global energy demands, and it also contributes to reduced environmental emissions. Microalgae is a potential resource for qualitative biodiesel production due to its high specific growth rate, ability to accumulate significant quantities of intracellular...
Article
Desmodesmus maximus is a potential candidate for algal biofuel production. It was cultivated for lipid enhancement in four different types of wastewater used as algal growth media. After growing Desmodesmus maximus for period of 10 days in four different types of waste water, it was found that swine wastewater collected from Swine Research Centre o...
Article
Algae are potential renewable energy source that provides numerous types of biofuels. Traditional methods of algae harvesting involve high electrical energy in the range of 200 to 5000 watt-hour for collecting per kilogram of algae. Moreover the added chemicals during the harvesting process degrade the algae quality leading to inferior biomass feed...
Article
Full-text available
Microalgae are considered one of the potent renewable energy sources; however, the microalgal biofuel technology is economically unsustainable due to higher biomass production costs. Radical reformations in microalgae culture and adequate data acquisition can significantly help optimize the microalgae biomass production and make the process economi...
Article
Full-text available
The green synthesis of nanoparticles (NPs) is the safest, ecofriendly, cost-effective, and non-hazardous approach of nanotechnology. In the current study, we described the green synthesis of silver nanoparticles (AgNPs) using Cuphea carthagenensis aqueous leaf extract as a reducing, capping, and stabilizing agent. The study aims at the synthesis, c...
Article
In this study, a novel heterogeneous catalyst from the unexploited radish leaves (Raphanus sativus L.) was synthesized and employed for biodiesel production using waste soybean cooking oil (SWCO) and Scenedesmus obliquus oil (OSO). The synthesized catalyst (CLP) was characterized by FTIR, BET, XRD, TGA, SEM, TEM, EDX, BET, and XPS. Moreover, the Ha...
Article
Full-text available
The present research aims to exploit the antioxidant and antibacterial activities of freshwater microalgae, Scenedesmus obliquus, by performing polarity-wise successive solvent extraction by hexane, chloroform, ethyl acetate, acetone, methanol, and water. The antibacterial and antioxidant activities of these crude extracts were evaluated, and a cor...
Article
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In the current research, we report on the synthesis of WO3/GQD system as a heterogeneous catalyst for the transesterification of waste cooking oil into biodiesel using methanol. The characterization of the prepared catalyst was done by X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscope (TEM), energy-dispersive X-ray (EDX)...
Article
This study emphasizes the vision of a green, renewable and sustainable integrated route for the catalyst synthesis process and to transform fruit and kitchen wastes into fuel. The alkali and alkaline earth metal-rich biochar, a by-product obtained from banana peel thermochemical conversion (pyrolysis), was calcined and utilized as a catalyst for co...
Article
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Open-field burning of rice straw contributes significantly to deterioration of air quality. Similarly, defatted algal residue is a surplus by-product of the algal biofuel industry. This study emphasizes on the two-step conversion of agro-industrial residues (rice straw and Scenedesmus obliquus deoiled biomass) into biodiesel and carotenoids using o...
Article
The sustainable processing approach has been followed to transform the potato peel as the potential source for bio-oil and green heterogeneous catalysts. The byproduct (biochar) obtained from the thermochemical conversion was reused as a green, renewable and sustainable source for heterogeneous catalysts. The alkali and alkaline-rich biochar was re...
Chapter
Concern about the scarcity of fossil fuel supplies, rising CO2 emissions, and related climate change are promoting the production of renewable fuels. Biodiesel is an eco‐friendly, nontoxic, renewable transportation fuel that can be produced from different waste sources through chemical processes. Regarding its generation, heterogeneous catalysts gi...
Chapter
In recent decades, the bioprospecting of valuable metabolites from microalgae, especially lipid, has gained massive attention as the primary solution to overcome the problems associated with the unprecedented consumption of global fossil-fuel stocks. Many microalgal species can be convinced to accumulate substantial quantities of lipids, mostly gre...
Article
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Microalgae have been accepted as a potential feedstock for biofuel production due to their high oil content and rapid biomass production. In this study, deoiled Scenedesmus obliquus (SO) was used for evaluating whether deoiled algal biomass residue is potential as an alternative energy resource for bio-ethanol production with different heterogeneou...
Article
Microalgal strains are potent for algal lipid generation as well as biofuel production and on the other hand animal manure is a commonly found waste product in Assam which are rich in nitrogen and phosphorus inter alia and is vital for algal growth, therefore in the present study two trials of experiments were conducted to evaluate the biomass in t...
Chapter
Microalgae are considered as a promising and inexpensive feedstock for biofuel production by microbial fermentation. Algal-based fuels are renewable, effective, and environment friendly as they have the potential to match the global demand for fuel in the future. The pre-treatment and carbohydrate extraction from algal cell are the main obstacle in...
Chapter
Microbial fuel cell (MFC) has great potential as a green and alternative form of energy. The main disadvantage of MFC is low power generation. The present work aims at developing biomass-derived nitrogen self doped porous carbon to be used in the cathode of MFC to increase its power output. Water Lettuce (Pistia stratiotes) underwent hydrothermal t...
Article
An effective and greener methodology has been developed for the ipso-hydroxylation of arylboronic acids utilising a heterogeneous agro-waste based catalyst Calcined Burnt Peel Ash (CBPA). The catalyst CBPA has been prepared from the peel of Musa balbisiana Colla. The protocol is efficient for different electronically diverse phenylboronic acid moie...
Article
Full-text available
Scenedesmus obliquus is a locally available microalgae in the north-eastern region of India. Pyrolysis of Scenedesmus obliquus has been performed in a fixed-bed vertical reactor, at 350 to 550 °C temperature range with 40 °C/min heating rate. The physicochemical properties of the solid and liquid yields were investigated. The influence of temperatu...
Article
Microalgal biomass is a potential feedstock for biofuel production because of its oleaginous nature and fast growth rate. Furthermore, its cultivation does not compete with crop producing land and thereby eliminating food vs. fuel dilemma. This study describes a low-cost nutrient mediated cultivation method for growing lipid enriched algal biomass...
Article
The present work has been undertaken to enhance the biomass and lipid content of microalga Chlorella sp. Here, KNO3 in microalgae growth media BG11 has been used as a growth promoting agent for increased lipid production. The produced lipid has been converted into biodiesel using CaO as a catalyst. CaO catalyst has been prepared using waste egg she...
Article
Full-text available
Waste biomass derived heterogeneous catalyst is an excellent alternative to chemically synthesized catalysts. In this work, calcined Tectona grandis leaves were proposed as an eco-friendly, renewable and low cost heterogeneous base catalyst. The prepared catalyst was examined by FTIR, XRD, XPS, SEM, EDX, TEM, TGA, BET and Hammett indicator test. Th...
Article
Waste biomass derived heterogeneous catalyst is an excellent alternative to chemically synthesized catalysts. In this work, calcined Tectona grandis leaves were proposed as an eco-friendly, renewable and low cost heterogeneous base catalyst. The prepared catalyst was examined by FTIR, XRD, XPS, SEM, EDX, TEM, TGA, BET and Hammett indicator test. Th...
Article
Development of solid mixed oxide catalyst from waste biomass is a scarcely studied area. Thus, present protocol aims to prepare an environmentally friendly, efficient, renewable and recyclable heterogeneous base catalyst from Carica papaya stem. The chemical and structural properties of the catalyst were examined by Fourier-transform infrared spect...
Article
Full-text available
Purpose Microbial lipids derived from oleaginous fungi are considered as an alternative feedstock for biodiesel production. We attempt to isolate a cellulolytic oleaginous fungi as a potential feedstock for biodiesel production. Methods The fungus was identified by 5.8 S-ITS rRNA gene sequencing. The extracellular enzyme activities were recorded a...
Article
Oleaginous microalgae Scenedesmus sp. has a tremendous potentiality for the production of biodiesel. The lipid content of the species can be enhanced using different growth promoting sources. Hence, in this work we have prepared four BG11 media adding four different nitrogen sources namely BGNN (NaNO 3), BGKN (KNO 3), BGAN (NH 4 NO 3), and BGU (Ure...
Article
Solvent-free hydroconversion of levulinic acid (LA) was studied over Co/silica catalysts by applying a flow-through fixed-bed microreactor. Consecutive hydrogenation/hydrogenolysis and dehydration reactions proceeded over the catalyst having Co ⁰ metal and CoO x Lewis acid active sites. As a first step, LA was dehydrated to form an angelica lactone...
Article
There are many non-edible oil seed bearing trees like Ratanjyot (Jatropha curcas), Mahua (Madhuca indica), Rubber seed (Hevea brasilensis), Nahor (Mesua ferrea), Karabi (Thietiva peruviana) and Karanja (Pongamia glabra) etc have been found to be a prominent source of oil for biodiesel production. Among these species Pongamia glabra and Mesua ferrea...
Article
Full-text available
Silica-supported Ni catalyst (6.6 wt% Ni) was prepared and tested in solvent-free hydroconversion of levulinic acid (LA) using flow-through fixed-bed tube-type microreactor at 250 and 275 °C in the pressure and space time range of 1–30 bar and 0.1–1.0 gcat g LA⁻¹ h, respectively. The catalyst was characterized by XRD, adsorption/desorption N2 isoth...
Article
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Current research reports the synthesis of in-situ TiO2/RGO nanocomposite and used as a heterogeneous catalyst for the transesterification of waste cooking oil into biodiesel. The prepared catalyst was characterized viz. X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), Energy Dispersive X-...
Article
Biodiesel production process encourages use of heterogeneous catalyst over homogeneous catalysts. The major problems associated with the use of homogeneous catalysts are its non-renewable nature, separation and washing which can be overcome by the use of heterogeneous catalysts. Therefore, in this work use of Musa balbisiana Colla peels, a waste bi...
Article
Full-text available
A simple, facile and one pot route for preparing SnO2 nanoclusters embedded on a mesoporous Sn(IV)organophosphonate(MSnP) framework is described. Reaction of SnCl4.5H2O with a flexible tris-phosphonic acid, mesityl-1,3,5-tris(methylenephosphonic acid) in presence of a surfactant under hydrothermal conditions produced the desired nanocomposite, SnO2...
Conference Paper
Full-text available
Exploration of new heterogeneous catalyst for biodiesel production and the use of non-edible vegetable oils as a sustainable source favourably could contribute to bioenergy research. In this regard the present investigation aims to demonstrate the catalytic activity of TiO 2-ZnO nanocatalyst towards the biodiesel production from Thevetia Peruviana...
Chapter
This study highlights an alternative route of biogas quality upgradation by absorption of CO2 using Musa bulbasiana stem (an agrowaste). The variations in percentage of CO2 absorption were investigated for different concentrations of ash (produced from Musa bulbasiana stem) in water and for different scrubber bed heights. Experimental results showe...
Article
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Single and double Guerbet alkylation of acetone with alcohols and hydrodeoxygenation of the produced alkylates were investigated. A flow-through tube reactor system, comprised of two subsequent fixed catalyst beds, was used. The first catalyst bed contained the catalyst for Guerbet coupling, namely activated hydrotalcite-supported nickel or palladi...
Article
Full-text available
The consecutive reduction of acetic acid was studied over two monometallic (nickel and cobalt) catalysts compared to indium doped bimetallic composites. A fixed bed flow-through reactor was applied with hydrogen stream at 21 bar at 240–380 °C. Efficient catalysts containing finely dispersed metal particles were obtained by in situ pretreatment with...
Article
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The gas phase coupling of ethanol to butanol was studied over Pd/KOH/activated carbon catalyst using a flow-through tube microreactor, applying WHSVE of 0.20–2.0 h−1, H2 to ethanol molar ratio of 6, 21 bar total pressure and 275–375 °C temperature. Butanol was the product of highest yield. Longer chain primary aliphatic alcohols, having even number...
Article
–SO3H containing carbon materials (sulfonated carbons) were successfully employed as heterogeneous catalysts upon the selective esterification of glycerol with lauric and oleic acids. The functionalized carbon catalysts outperformed zeolites H–Y, H-ZSM-5 and liquid H2SO4 with respect to activity and selectivity, thus producing commercially importan...
Article
The present investigation aims to highlighten the effect of monoglyceride surfactant (GMO) on structure and dynamic behavior and other fuel characteristics of microemulsion based hybrid biofuels (MHBFs). Fuel quality of MHBFs formulated using purified GMO (>90%), which was prepared by esterification of glycerol, was investigated in the study. Phase...
Chapter
Liquid biofuels such as biodiesel, derived from vegetable oils are gaining worldwide importance as a substitute for diesel fuel owing to their environmental advantages and renewable sources in nature. Since biodiesel has the similar fatty acid composition as the parent oil, its fuel properties are directly affected by the composition of the precurs...
Conference Paper
Full-text available
Microalgae are unicellular autotrophic, photosynthetically efficient organisms that use light energy and carbon dioxide (CO 2). Biofuel production from the promising genus of Microalgae, the Chlorella species have long been identified as potentially good source because of their high oil content, fast growth, easy cultivation and short life span. Ch...
Research
Full-text available
The fashion of production of biodiesel is emerging exponentially owing to greater disquiet about environmental protection and diminution of fossil fuel reservoirs. In this paper, a novel concept “Designer Biodiesel” for the biodiesel production has been accentuated. Since, the identical fatty acid composition of the biodiesel resembles to the precu...
Article
This investigation highlights the feasibility of microemulsion based hybrid biofuel from waste cooking oil (WCO) as an alternative to petro diesel. In this study, microemulsification to produce biofuel has been demonstrated as energy intensive and economically viable alternative route of liquid biofuel production. The microemulsion based hybrid bio...
Article
100% triacetin selectivity was achieved in glycerol acetylation with acetic anhydride in 20-50 min in the presence of catalytic amounts of mesoporous sulfonated carbons and zeolite H-Y. Experimental results obtained over a range of solid acids with varying structure and acidic properties indicate that selectivity to triacetin was influenced mainly...
Article
Multifunctional mesoporous solid acids were prepared by the sulfonation of carbonized de-oiled seed waste cake (DOWC), a solid waste from biodiesel production. Detailed structural characterization of the materials by elemental analysis, FT-IR, Raman, XRD, XPS, TGA, NH3-TPD and N2-physisorption showed that they were structurally different from the c...
Article
Depletion of the natural resources, the issue of food security and increased attention towards environmental issues have driven the lubricant industries to stimulate the development of non-edible oil-based material as bio-lubricant. The term bio-lubricant applies to all lubricants that are both rapidly biodegradable and non-toxic to human and aquat...
Article
Exploration of new non-edible feedstocks for biofuel production and the use of economically favorable conversion technologies could significantly contribute to bioenergy research. In this regard the present investigation aims to highlighten hybrid biofuels (HBFs) prepared from crude vegetable oils of five locally available plant species namely, Gme...
Article
Quantitative analysis of woods and barks of six indigenous tree species of north-east India grown in their natural habitat and different localities of Assam were investigated. Fuel value index, proximate analysis, ultimate analysis, and biochemical compositions were determined. The percentage weight loss by each tree species after 8 weeks of sundry...
Article
A series of Li doped egg shell derived CaO is prepared for biodiesel production from nonedible oil feedstock. The catalyst is characterized by X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), Brunauer–Emmett–Teller (BET) surface area measurements and their basic strengths were measured by Hammett indicators. Maximum convers...
Article
Full-text available
Biodiesel was produced from high free fatty acid (FFA) Jatropha curcas oil (JCO) by two-stage process in which esterification was performed by Brønsted acidic ionic liquid 1-(1-butylsulfonic)-3-methylimidazolium chloride ([BSMIM]Cl) followed by KOH catalyzed transesterification. Maximum FFA conversion of 93.9% was achieved and it reduced from 8.15...
Article
Catalyst plays an important role in biodiesel production. Owing to the advantages of heterogeneous catalysts in terms of separation and reusability over the traditionally used homogeneous catalyst, the research has now been focused on these heterogeneous catalysts in recent years. In order to make the process fully “green”, researchers are trying t...
Article
Valorization of oilseed processing wastes is thwarted due to the presence of several anti-nutritional factors like phenolics, tannins, glucosinolates, allyl isothiocyanates and phytates; moreover, literature reporting on their simultaneous extraction and subsequent practical application is scanty. Different solvent mixtures containing acetone or me...
Article
Full-text available
Biomass in the form of fuelwood has been a source of energy for many centuries all over the world. In rural India, fuelwood remains the first choice of energy source. Arunachal Pradesh is home to many different tree species; so far most of the fuelwoods of Arunachal Pradesh have never been studied for their fuel characteristics. This study is carri...
Article
Domestic energy consumption along with the modern use of biomass fuel in the households were studied for Bijini (South Blocks), Betanapara, and Oxiguri villages of Chirang District in Assam, which are categorized as Urban, Peri-urban, and Rural villages, respectively, based on their locations from Bijni town. The annual per capita consumption of do...
Article
The aim of this work is to find a green catalyst prepared straight from biomass for biodiesel production. In this work ash obtained from Vigna radiata plant has been proposed as heterogeneous base catalyst in transesterification of waste cooking oil. EDX studies showed that the ash content of Vigna radiata (mung bean) mainly contains calcium and po...
Article
In the wake of increasing environmental constraints this work is aimed at developing a catalyst purely prepared from waste biomass source as the raw material. The catalysts is investigated for its applicability in transesterification of vegetable oil with the objectives : (i) To use waste shells of mollusk as raw material for the preparation of act...
Article
The study presents preparation of a Mesua ferrea L. seed oil based emulsion hybrid fuel system by blending with alcohols (ethanol and butan–2–ol) in which butan–2–ol was employed as surfactant. The study also deals with the investigation of the effect on fuel properties of the hybrid fuel due to the variation in surfactant amount and analysis of th...
Article
Osmotic dehydration of bamboo shoots was carried out using a mixture of sucrose and salt solution, keeping the sugar concentration fixed at 50°Brix, while the salt concentration was varied. The main purpose of the study was to find out the effect of the various processing conditions, i.e., sodium chloride concentration (5–15% w/w), process time (30...
Article
Among the different alternative fuels explored for replacing existing fossil diesel, biodiesel has emerged as the potential renewable energy. It is made from nontoxic, biodegradable, renewable sources such as refined and used vegetable oils and animal fats. The usage of refined vegetable oil is considered as uneconomical owing to the high feedstock...
Article
Biodiesel production via transesterification of mustard oil with methanol using solid oxide catalyst derived from waste shell of Turbonilla striatula was investigated. The shells were calcined at different temperatures for 4 h and catalyst characterizations were carried out by X-ray diffraction (XRD), scanning electron microscope (SEM), energy disp...
Article
The waste eggs and mollusk shells are found to be the richest sources of calcium carbonate and have been utilized for various purposes after proper treatments. When calcined at a proper temperature calcium carbonate converts into CaO, which is a metal oxide. Researchers have found that the CaO prepared from the waste shells can be used as catalyst...
Article
Ten indigenous fuelwood species of northeast India were ranked by pair-wise comparison, a technique used by rural people for selection of fuelwood, and also from their fuel value indexes calculated by using three different formulae. It was found that the ranks of the species obtained from fuel value indexes calculated according to the formulae repo...
Article
Composite bipolar plates for Proton Exchange Membrane Fuel Cell (PEMFC) are prepared by compression molding technique using polymer as binder and graphite as electric filler material with some other reinforcements. Study on the effect of resole and novolac type phenolic resin on the properties of composite bipolar plate, such as bulk density, poros...