Article
Chemistry, Physical
Fahriye Donmez, Nezihe Ayas
Summary: In this study, Ni/TiO2 catalysts were synthesized using the sol-gel technique and characterized through various methods, while the effects of different factors on hydrogen production performance were investigated. It was found that high hydrogen yield and production rate could be achieved under specific reaction conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
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
Polymer Science
Ahmed Abutaleb
Summary: Non-noble CuxNi1-x (x = 0, 0.1, 0,2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1) alloy nanoparticles supported on PVDF-HFP nanofibers were successfully fabricated through electrospinning and in situ reduction. The catalysts exhibited the formation of bimetallic NiCu alloy supported on PVDF-HFP and showed better catalytic activity for SBH hydrolysis compared to monometallic counterparts. The Cu-0.7 Ni-0.3/PVDF-HFP catalyst demonstrated the best catalytic performance with low activation energy and satisfying stability.
Article
Chemistry, Physical
Aybike Paksoy, Samira Fatma Kurtog, Azam Khodadadi Dizaji, Zerrin Altintas, Sina Khoshsima, Alper Uzun, Ozge Balci
Summary: Innovative metal boride nanocatalysts containing crystalline Co-Ni based binary/ternary boride phases were synthesized and used in the hydrolysis of NaBH4. The composite catalysts showed better catalytic performance compared to their single components, particularly the CoB-Ni4B3 phase. The results suggest that these composite structures can be used as alternative and stable catalysts for efficient hydrogen production from sodium borohydride.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Jyun-Lin Lai, Win-Jet Luo, Yean-Der Kuan, Pai-Jun Zhang
Summary: This study focused on processing water vapor to increase hydrogen production. Experimental results indicated that using a certain concentration of catalyst and appropriate operating conditions can effectively enhance hydrogen production.
Article
Chemistry, Physical
Jifeng Deng, Kurbannisa Kadeer, Chaoyuan Hu, Zewei Xie, Yu Shi, Xiao Liu, Lei Xie, Jinrong Xu, Jie Zheng, Xingguo Li
Summary: In this study, a sponge catalyst for hydrogen generation from liquid hydrogen carriers was developed. The commercial melamine formaldehyde (MF) sponge was modified by grafting polyvinyl alcohol (PVA) through acid-catalyzed acetalization with formaldehyde. The resulting polyvinyl formal/MF (PVF/MF) composite sponge exhibited excellent characteristics as a catalyst, including high activity, high hydrogen storage density, easy catalyst recycling, and quasi-solid state behavior during H-2 generation, as demonstrated in the applications of NaBH4 solution and thermal dehydrogenation of perhydro N-ethylcarbazole.
JOURNAL OF POWER SOURCES
(2023)
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
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
Environmental Sciences
Aishah Mahpudz, Siu Ling Lim, Hitoshi Inokawa, Katsuki Kusakabe, Ryuichi Tomoshige
Summary: The study successfully synthesized a non-noble metal cobalt nanoparticle catalyst supported on layered double hydroxide, which showed efficient catalytic hydrolysis of sodium borohydride to produce hydrogen. The optimized size of cobalt nanoparticles enhanced catalytic activity, but the catalyst exhibited gradual decrease in activity during repeated tests.
ENVIRONMENTAL POLLUTION
(2021)
Article
Energy & Fuels
Cafer Saka
Summary: A hybrid g-C3N4-SiO2-N composite was successfully produced using calcination and hydrothermal methods. The composite catalyst showed excellent catalytic performance in the H2 production reaction from NaBH4 methanolysis, with a high hydrogen generation rate and good durability.
Article
Chemistry, Physical
Dilek Kilinc, Omer Sahin
Summary: In this study, an efficient, environmentally friendly, and stable catalyst was developed for the hydrogen evolution from sodium borohydride hydrolysis. The Ru complex catalyst was successfully synthesized and demonstrated promising durability and catalytic performance. The kinetic performance and mechanism of the catalyst were investigated, providing insights for the rational design and utilization of ruthenium complexes in hydrogen evolution.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Chemistry, Physical
Umit B. Demirci
Summary: Sodium borohydride (NaBH4) has been considered as a promising hydrogen storage material, but its hydrolysis still faces numerous obstacles. This article aims to assess the progress made in hydrolysis of NaBH4 and summarize the newly acquired knowledge.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Meryem Sena Akkus
Summary: In this study, nickel, nickel-chromium alloy, and nickel-vanadium alloy were coated to form a thin film on the slides prepared by magnetron sputtering process as catalysts for the hydrolysis of alkaline sodium borohydride. The effects of solution temperature, catalyst amount, initial pH, and catalyst performance on hydrogen generation rate were investigated using response surface methodology. The maximum hydrogen generation rates for Ni, NiCr, and NiV catalysts were determined under optimized conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Julide Hazal Turkcan, Huseyin Elcicek, Oguz Kaan Ozdemir
Summary: The study found that factors such as temperature, pH, reduction rate, and reducing agent concentration significantly affect the performance of catalysts in hydrogen production through hydrolysis of sodium borohydride. The analysis showed that pH and reduction rate have a greater impact on the hydrogen generation rate than temperature.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Merve Altinsoy, Ayhan Abdullah Ceyhan
Summary: In this study, a cobalt-doped catalyst was prepared from chicken eggshell powder for the hydrolysis of sodium borohydride. The effects of various parameters on the hydrolysis process were examined. The prepared catalyst showed a high hydrogen generation rate and good reusability, making it advantageous for use in sodium borohydride hydrolysis.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Chemistry, Analytical
Cafer Saka
Summary: This review provides a comprehensive study on the detection techniques and quantitative determination methods of CQ and its related metabolites. Various methods such as chromatography, electrophoresis, electroanalytical, spectroscopic, and immunological methods are extensively discussed. It aims to provide a better understanding of the use of CQ for therapeutic purposes in the COVID-19 outbreak.
CRITICAL REVIEWS IN ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Cafer Saka, Gulten Elci Olcenoglu, Omer Sahin
Summary: The petroleum coke sample (PCS) was successfully modified for the first time by oxygen plasma treatment (OPT), increasing the new active groups containing oxygen on the PCS surface, and removing malachite green dye from the aqueous medium.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Ibrahim Tegin, Cafer Saka
Summary: This study investigated the removal of methylene blue by both raw and modified clay, with the modified clay showing significant improvements in adsorption capacity. The modification process included calcination, acid treatment, and second calcination, with factors such as calcination temperature and acid/base concentration affecting the adsorption capacity. Characterization of the clay was done by SEM and FTIR, and Langmuir and Freundlich isotherm models were used to analyze the results.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2023)
Article
Environmental Sciences
I Tegin, M. S. Batur, O. Yavuz, C. Saka
Summary: This study investigates a low-cost and economical heat-treated clay sample as a potential adsorbent for the removal of Cu(II), Pb(II) and Cd(II) ions from aqueous solutions. The results show that the adsorption ability of the heat-treated clay adsorbent is significantly improved compared to the raw clay sample.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Cafer Saka, Yavuz Yardim, Omer Sahin, Orhan Baytar
Summary: This study investigates the application of chestnut shell-based activated carbon in iodine adsorption and as an electrochemical double-layer capacitor material. The results show that chestnut shell-based activated carbon exhibits excellent performance in adsorption and capacitor properties.
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
(2023)
Article
Chemistry, Physical
Yasar Genel, Ilyas Genel, Cafer Saka
Summary: Activated carbons synthesized from the ash tree were found to be effective adsorbents for removing methylene blue from aqueous solutions. The carbonaceous materials exhibited mesoporous structures and active functional groups. The highest adsorption capacities were obtained with chemical activation using zinc chloride and sodium hydroxide.
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
(2023)
Article
Chemistry, Physical
Cafer Saka
Summary: This study focuses on the production of two-stage metal-free catalysts from pistachio shells. The first stage involves the production of activated carbon (AC), while the second stage involves the production of catalysts doped with heteroatoms through hydrothermal heating of the obtained activated carbon with nitric acid. The metal-free catalysts are then used for hydrogen production from sodium borohydride (NaBH4) in methanol.
Article
Materials Science, Multidisciplinary
Cafer Saka, Ibrahim Tegin, Kubra Kahvecioglu
Summary: This study focuses on enhancing the adsorption capacity of activated carbon by sulphur doping, using almond shells as the base material. The results showed that sulphur doped activated carbon exhibits high adsorption performance for Cd(II) and follows Langmuir isotherm and pseudo-second-order kinetic models.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Environmental Sciences
Kubra Kahvecioglu, Ibrahim Tegin, Omer Yavuz, Cafer Saka
Summary: In this study, activated carbon based on almond shells was produced through microwave heating and then modified with phosphorus and oxygen through hydrothermal heating. The modified activated carbon showed improved adsorption efficiency for Cd(II) and Pb(II) ions. The results indicated that the modified activated carbon follows Langmuir isotherm and pseudo-second-order kinetics for adsorption of both Cd(II) and Pb(II).
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Cafer Saka
Summary: The surface properties of graphitic carbon nitride (GCN) were enhanced by doping with sulphur (S), boron (B), and oxygen (O). Metal-free GCN catalysts with heteroatom dopants showed improved surface functional groups and a carbon defect structure. These catalysts were used for hydrogen production from sodium borohydride (SB) methanolysis, resulting in a 2.2-fold increase in H2 production compared to GCN. The HGR value obtained with B, O, and S doped GCN was 9166 ml min-1g-1. XPS, SEM-EDX, TEM, FTIR, and XRD analyses were performed to investigate the structural properties of the catalysts, and the activation energy (Ea) for B, O, and S doped GCN was determined to be 28.89 kJ mol-1.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Cafer Saka
Summary: Hybrid kaolin-g-C3N4 heterostructure particles were fabricated and phosphorus and oxygen doped kaolin-g-C3N4 metal-free catalyst was synthesized for the first time for effective hydrogen production from sodium borohydride methanolysis. The catalyst showed a hydrogen generation rate of 5500 ml min-1g-1 and an activation energy of 31.90 kJ mol-1. The kaolin-g-C3N4 and doped catalysts were characterized by various techniques, and a mechanism for hydrogen production was proposed.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Cetin Murtazaoglu, Ibrahim Tegin, Cafer Saka
Summary: In this study, activated carbon (AC) was produced from pistachio shells using potassium hydroxide (KOH) activation, and then modified with hydrogen peroxide (H2O2). The modified AC (KOH-AC-H2O2) was found to effectively adsorb Cu (II) and Zn (II) ions from wastewater, with adsorption behavior in accordance with the Langmuir isotherm model.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Chemistry, Physical
Yavuz Yardim, Cafer Saka
Summary: This study investigated the thermal activation of Chlorella vulgaris and Spirulina platensis microalgae using potassium hydroxide (KOH) in a carbon dioxide (CO2) atmosphere, followed by the hydrothermal interaction with nitric acid to form nitrogen and oxygen-doped activated carbons. These carbons were then used to fabricate electrochemical supercapacitors. The morphological properties of the obtained pores were characterized by transmission electron microscopy (TEM), and the electrochemical properties were evaluated by cyclic voltammetry (CV) in different electrolytes. The results showed that the nitrogen and oxygen-doped electrode based on Spirulina platensis microalgae exhibited the highest specific capacitance of 99.53 Fg(-1) in a 1 M H2SO4 electrolyte, while the supercapacitor based on the activated carbon electrode from Chlorella vulgaris microalgae showed the highest specific capacitance of 156.04 Fg(-1) in a 1 M KCl electrolyte.
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
(2023)
Article
Energy & Fuels
Cafer Saka, Ibrahim Tegin, Kubra Kahvecioglu, Omer Yavuz
Summary: In this study, a two-step method was employed to produce an effective adsorbent for the adsorption of cadmium (Cd) (II) and lead (Pb)(II). The method involved the preparation of activated carbon (AC) from almond shells using microwave heating and potassium hydroxide (KOH), followed by nitrogen and oxygen doping through hydrothermal treatment with nitric acid. The resulting materials were characterized and their adsorption performance, mechanism, kinetics, and thermodynamics were evaluated. The nitrogen- and oxygen-doped ACs exhibited good adsorption capacity for Cd (II) and Pb (II), with values of 106.38 mg/g and 76.33 mg/g, respectively.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Environmental Sciences
Cafer Saka
Summary: In this study, phosphorus and boron-doped graphitic carbon nitride/zeolite catalysts were prepared under three-step heating conditions. The catalysts were characterized using various techniques, and it was found that they can be used as metal-free catalysts for hydrogen production from sodium borohydride in methanol. The hydrogen production rate for these catalysts was measured to be 6250 ml min(-1) g(-1), which is reported for the first time in the literature.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)