Article
Chemistry, Physical
Lijing Yang, Congmin Fan, Jiapeng Zhang, Fengming Zhang, Ran Li, Shuang Yi, Yue Sun, Hua Dong
Summary: A SiO2@PAA catalyst composed of silica nanoparticles modified with poly(acrylic acid) was developed for NaBH4 methanolysis, showing excellent catalytic performance. The catalyst exhibited significantly higher hydrogen generation rate and lower activation energy compared to unmodified silica. Furthermore, the catalytic activity of the SiO2@PAA catalyst could be restored after regeneration with diluted hydrochloric acid solution.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Electrical & Electronic
Sefika Kaya, Ceren Saka, Aykut Caglar, Mustafa Kaya, Hilal Kivrak
Summary: In this study, Cd-, Te-, Se-, and S-doped titanium dioxide catalysts were prepared via impregnation method. The hydrogen generation performances of these catalysts from NaBH4 under UV illumination and in the dark were investigated. The results showed that the TiO2 catalyst doped with 0.1% Cd had the highest initial hydrogen generation rate under UV illumination.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
S. Ozarslan, M. R. Atelge, Hilal Demir Kivrak, Sabit Horoz, Cenk Yavuz, M. Kaya, S. Unalan
Summary: The study demonstrated the performance of metal-doped tea factory waste catalyst in methanolysis and supercapacitor application, showing potential in energy storage and production areas.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Ibrahim Gozeten, Kadir Karakas, Yasar Karatas, Mehmet Tunc, Mehmet Gulcan
Summary: This study focuses on the production of hydrogen from sodium borohydride in a methanolysis environment using ruthenium nanoparticles impregnated on a halloysite support material. The newly synthesized nanocatalyst showed excellent activity and reusability in the catalytic methanolysis reaction. The material analysis confirmed the homogeneous distribution of ruthenium nanoparticles on the support material. Kinetic studies were conducted to calculate the kinetic parameters and determine the rate equation for hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Cafer Saka, Asim Balbay
Summary: Metal-free catalysts were produced from apricot kernel shells for efficient H-2 generation from NaBH4 methanolysis. The catalysts were activated through a two-step process and characterized for their structure and properties. The results showed that the metal-free catalyst exhibited a high hydrogen production rate and low activation energy.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Jun Hu, Gang Kong, Yanbin Zhu, Chunshan Che
Summary: A novel method for ultrafast chemical reduction of graphene oxide at room temperature using NaBH4, Na2MoO4, and HCl was developed in this study, resulting in rGO with higher reduction degree compared to rGO synthesized solely by NaBH4 at high temperature. The rGO electrode based on this reducing method exhibited a superior specific capacitance, making it suitable for supercapacitors.
CHINESE CHEMICAL LETTERS
(2021)
Article
Energy & Fuels
Cafer Saka
Summary: Phosphorus-doped graphitic carbon nitride (gC3N4) has been used as a catalyst in the dehydrogenation of sodium borohydride (NaBH4) methanolysis for the first time. The reaction parameters including interaction time, NaBH4 concentration, catalyst amount, and temperature were investigated. The results showed that the catalyst had good performance in the reaction, and its activity was affected by the above-mentioned parameters.
Article
Chemistry, Physical
Ceren Saka, Derya Yildiz, Sefika Kaya, Aykut Caglar, Dilarasu Elitok, Elif Yayli, Mustafa Kaya, Rasit Atelge, Hilal Kivrak
Summary: In this study, activated carbon is prepared from defatted hazelnut bagasse and its catalytic activities for NaBH4 methanolysis and electrooxidation are evaluated. The material characterization results show that the prepared activated carbons are successful. The N2 adsorption-desorption results reveal that FH3-500 activated carbon has the highest BET surface area, total pore volume, and micropore volume. Additionally, FH3-500 activated carbon catalyst exhibits the highest initial hydrogen production rate and FH2-500 activated carbon shows the highest electrocatalytic activity and stability for sodium borohydride electrooxidation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Samikannu Prabu, Kung-Yuh Chiang
Summary: Sulfur, nitrogen-codoped highly porous carbon nanostructures are used as efficient components for hydrogen generation. The waste coffee grounds are carbonized and activated to produce hierarchically SN doped porous carbon nanostructures. Pd-Co3O4 nanoparticles are anchored onto SN-codoped carbon nanosheets. An effective method for optimization of the Pd-Co3O4/SN-CNS-600 catalytic efficiency is proposed. The catalyst exhibits excellent catalytic activity for NaBH4 catalytic methanolysis at room temperature with a high hydrogen generation rate.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Agricultural Engineering
Cafer Saka, Asim Balbay
Summary: Metal-free carbon catalysts doped with nitrogen and oxygen showed excellent catalytic performance in the NaBH4 methanolysis reaction. With high hydrogen production rate and relatively low activation energy, this catalyst has promising potential for hydrogen generation applications.
BIOMASS & BIOENERGY
(2021)
Article
Energy & Fuels
Saliha Ozarslan, M. Rasit Atelge, Mustafa Kaya, Sebahattin Unalan
Summary: In this study, a catalyst produced from tea factory waste was utilized for hydrogen production by methanolysis of sodium borohydride. This dual-function material acted as both catalyst and supercapacitor, showing promising results for hydrogen generation. The catalyst was synthesized by treating the waste with acetic acid, leading to efficient hydrogen generation and resembling supercapacitor curves in literature.
Article
Chemistry, Physical
O. V. Netskina, E. S. Tayban, V. A. Rogov, A. M. Ozerova, S. A. Mukha, V. I. Simagina, O. V. Komova
Summary: In the study, it was found that cobalt catalysts are more active than nickel catalysts in the hydrolysis of sodium borohydride. One reason for the lower activity of nickel catalysts is the presence of hydrogen on its surface, which interferes with reactant adsorption. The addition of cobalt to nickel catalysts can enhance hydrogen generation rate.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Aysel Kanturk Figen
Summary: The study focused on continuous hydrogen production from sodium borohydride through methanolytic dehydrogenation, achieving continuous H-2 production using semi-continuous regimes. Batch catalytic hydrogen generation profiles were examined and a figure of merit (FOM) was used for comparative analysis of catalysts' performance. The semi-continuous regime resulted in stable hydrogen production for almost 2.6 hours, with a production rate of 0.94 Lh(-1) from Co-O-B catalyzed methanolytic dehydrogenation of NaBH4.
Article
Chemistry, Physical
Burcu Kiren, Nezihe Ayas
Summary: Hydrogen is expected to play a crucial role as an environmentally friendly and flexible energy carrier in future energy systems. This study investigates the effects of catalyst composition and reaction conditions on hydrogen yield in the hydrolysis of NaBH4, and identifies that a catalyst with 40 wt% Ni content exhibits the best performance under specific conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Tulin Avci Hansu
Summary: A novel RuW/MWCNT catalyst was synthesized successfully for the hydrolysis reaction of NaBH4. The addition of W to Ru on MWCNT support increased the catalyst activity. Surface characterization of the catalyst was performed using SEM-EDX, XRD, XPS, and TEM analysis methods. The hydrolysis performance of RuW/MWCNT catalyst was investigated by studying parameters including temperature, catalyst amount, NaBH4 concentration, and NaOH concentration.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Green & Sustainable Science & Technology
Duygu Elma Karakas, Murat Akdemir, M. R. Atelge, Mustafa Kaya, A. E. Atabani
Summary: This study investigated the effects of various parameters on the production of hydrogen using defatted spent coffee grounds (DSCG) as organic waste. The optimal conditions were found to be burning 50% Co (2+) at 400 degrees C for 90 min. The prepared DSCG-Co catalyst was characterized and used as an active substance in a supercapacitor cell, resulting in good capacitance values and similar performance to ideal supercapacitors.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2023)
Article
Green & Sustainable Science & Technology
A. E. Atabani, Eyas Mahmoud, Muhammed Aslam, Salman Raza Naqvi, Dagmar Juchelkova, Shashi Kant Bhatia, Irfan Anjum Badruddin, T. M. Yunus Khan, Anh Tuan Hoang, Petr Palacky
Summary: The global market for fuel pellets is growing due to coal substitutes, but sustainability and biomass availability are major issues. Spent coffee grounds can be used to produce high heating value fuel pellets, but burning 100% SCG leads to high NO R emissions and low boiler efficiency. Mixing SCG with other biomass improves combustion performance. Further research is needed on the combustion and emissions of defatted spent coffee grounds.
ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY
(2023)
Review
Agricultural Engineering
Veeramuthu Ashokkumar, G. Flora, Murugan Sevanan, R. Sripriya, W. H. Chen, Jeong-Hoon Park, J. Rajesh Banu, Gopalakrishnan Kumar
Summary: Carotenoids are natural pigments found in algae, fungi, bacteria, and plants. They have significant applications in various industries such as food, feed, cosmetics, nutraceuticals, and pharmaceuticals. Carotenoids are known for their health benefits and are commonly used in our daily diet to reduce the risk of chronic diseases. This review paper focuses on the synthesis of carotenoids and their potential use in the food and pharmaceutical industries, discussing the challenges and future perspectives for the advancement of circular bioeconomy.
BIORESOURCE TECHNOLOGY
(2023)
Review
Agricultural Engineering
Vinod Kumar, Pedro Brancoli, Vivek Narisetty, Stephen Wallace, Dimitris Charalampopoulos, Brajesh Kumar Dubey, Gopalakrishnan Kumar, Amit Bhatnagar, Shashi Kant Bhatia, Mohammad J. Taherzadeh
Summary: The management of a large amount of food waste, equivalent to 1.3 billion tons, is a major challenge. Bread waste (BW) is a promising feedstock for biorefineries, and this review focuses on its potential for sustainable production of important chemicals. The availability of over 100 million tons of BW as a feedstock for biorefineries is discussed, along with examples of platform chemicals produced from BW, such as ethanol, lactic acid, succinic acid, and 2,3-butanediol. The review compares BW-based production of these metabolites with other feedstocks. It also addresses logistic and supply chain challenges associated with using BW as feedstock, and concludes with a discussion on life cycle analysis and comparison with other feedstocks.
BIORESOURCE TECHNOLOGY
(2023)
Article
Energy & Fuels
Georgeio Semaan, M. R. Atelge, Roent Dune Cayetano, Gopalakrishnan Kumar, Roald Kommedal
Summary: This study evaluates the conditions for assessing the biochemical methane potential of spent coffee grounds as a substrate, and finds that a substrate-to-inoculum ratio of 2 is not suitable for bio-CH4 production. Pretreatment with dilute acid and thermal has the potential to increase bio-CH4 yield, with significant effects observed for pretreatment time, acid concentration, and liquid-to-solid ratio. Fourier-transform infrared spectroscopy shows that major functional groups are still present in the coffee grounds after pretreatment.
Article
Agricultural Engineering
Soheil Valizadeh, Yasin Khani, Abid Farooq, Gopalakrishnan Kumar, Pau Loke Show, Wei-Hsin Chen, See Hoon Lee, Young-Kwon Park
Summary: Steam gasification of microalgae over Ni-perovskite oxide catalysts resulted in higher gas yields and H2 selectivity compared to Ni/Al2O3 catalysts. The improvement in Ni dispersion and interaction with the support was achieved by using perovskite oxide supports (CaZrO3, Ca(Zr0.8Ti0.2)O3, and Ca(Zr0.6Ti0.4)O3) with partial substitution of B. The best performance was observed for Ni/Ca(Zr0.8Ti0.2)O3 due to the synergistic effect of metallic Ni and elements present in the perovskite structures, resulting in enhanced oxygen mobility.
BIORESOURCE TECHNOLOGY
(2023)
Article
Chemistry, Physical
Ceren Saka, Derya Yildiz, Sefika Kaya, Aykut Caglar, Dilarasu Elitok, Elif Yayli, Mustafa Kaya, Rasit Atelge, Hilal Kivrak
Summary: In this study, activated carbon is prepared from defatted hazelnut bagasse and its catalytic activities for NaBH4 methanolysis and electrooxidation are evaluated. The material characterization results show that the prepared activated carbons are successful. The N2 adsorption-desorption results reveal that FH3-500 activated carbon has the highest BET surface area, total pore volume, and micropore volume. Additionally, FH3-500 activated carbon catalyst exhibits the highest initial hydrogen production rate and FH2-500 activated carbon shows the highest electrocatalytic activity and stability for sodium borohydride electrooxidation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Biochemistry & Molecular Biology
Lorenzo Bartolucci, Stefano Cordiner, Emanuele De Maina, Gopalakrishnan Kumar, Pietro Mele, Vincenzo Mulone, Bartlomiej Iglinski, Grzegorz Piechota
Summary: Plastics-based materials have a high carbon footprint and their disposal is a significant environmental problem. Biodegradable bioplastics have gained attention as an alternative to conventional plastics, especially in the food packaging sector. The evaluation of optimal waste management routes for bioplastics is crucial for their sustainable use.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Agricultural Engineering
Charles B. Felix, Wei-Hsin Chen, Jo-Shu Chang, Young -Kwon Park, Samrand Saeidi, Gopalakrishnan Kumar
Summary: Oxidative torrefaction is recommended for improving the fuel properties of microalgae as solid biofuels. Temperature, time, and O2 concentration have significant effects on various parameters such as solid yield, energy yield, and higher heating value. The optimal conditions for this process are 200°C, 10.6 min, and 12% O2, resulting in an energy yield of 98.73% and an enhancement factor of 1.08. Furthermore, it shows higher reactivity under an air environment compared to inert torrefaction conditions.
BIORESOURCE TECHNOLOGY
(2023)
Review
Agricultural Engineering
Si-Kyung Cho, Bartlomiej Iglinski, Gopalakrishnan Kumar
Summary: This review provides a comprehensive overview of biochar, discussing its production methods, characteristics, and various modifications and applications in environmental fields. It covers the removal of contaminants from water and wastewater, as well as its use in machine learning and microbial sensors. The review also analyzes the commercial and environmental benefits of biochar and explores future directions.
BIORESOURCE TECHNOLOGY
(2024)
Article
Thermodynamics
S. Pitchaiah, Dagmar Juchelkova, Ravishankar Sathyamurthy, A. E. Atabani
Summary: This study focuses on the production of biodiesel from Bael seeds. The experiment shows that the diesel-Bael biodiesel blend has comparable performance and emissions with neat fossil diesel. By adding dimethyl carbonate (DMC) as an ignition enhancer, the CO and HC emissions can be significantly reduced, while the NOx emissions are controlled.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Review
Environmental Sciences
R. Anu Alias Meena, J. Merrylin, J. Rajesh Banu, Shashi Kant Bhatia, Vinod Kumar, Grzegorz Piechota, Gopalakrishnan Kumar
Summary: The voluminous POME is a threat to the environment, but it can be converted into biorefinery products. The review discusses the risk assessment of POME and proposes using fish species, including invasive ones, for toxicants identification. Various treatments and technologies have been investigated, such as adsorption, anaerobic digestion, and microalgae cultivation, with emphasis on advanced bioreactors. The production of biodiesel from POME shows promise, despite economic challenges.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Sivaraman Chandrasekaran, J. Rajesh Banu, Gopalakrishnan Kumar
Summary: The study aimed to improve the hydrolysis potential of paper mill sludge by a two-phase disintegration process. The removal of extracellular polymeric substance (EPS) was focused on, in order to enhance the efficiency of subsequent disperser disintegration. The efficiency of disintegration was evaluated using soluble chemical oxygen demand (SCOD) and suspended solids (SS) reduction as assessment indices. Deflocculation of sludge at a calcium peroxide dosage of 0.05 g/g suspended solids (SS) and a temperature of 70 degrees C resulted in greater EPS removal. A clear variation was observed between deflocculated and disintegrated sludge (19.2%) compared to disintegrated sludge alone (13.5%), indicating the necessity of deflocculation before disintegration. Additionally, deflocculated and disintegrated sludge achieved higher biomethane production of 0.214 L/g COD than pretreated sludge alone. The efficiency of the proposed disintegration reduced the sludge management cost from 170 USD (Disperser alone (D alone disintegration)) to 51 USD (Thermal calcium peroxide mediated-Disperser (TCaO2-D disintegration)).
ENVIRONMENTAL RESEARCH
(2023)
Editorial Material
Energy & Fuels
A. E. Atabani, Arivalagan Pugazhendhi, Fares Almomani, Karthik Rajendran
