Article
Engineering, Chemical
Dandan Lei, Xiao-Li Sun, Shasha Hu, Huibin Cheng, Qinghua Chen, Qingrong Qian, Qiao Xiao, Changlin Cao, Lireng Xiao, Baoquan Huang
Summary: Recycling waste PET fibers and recovering monomers is crucial for environmental and resource protection. By using a stepwise feeding process and adding the fibers to a glycolysis agent at an elevated temperature, the conversion rate of PET fibers and the yield of water-soluble products were significantly increased. However, the conversion rate and yield of fibers were lower than those of bottle flakes and particles.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Review
Chemistry, Multidisciplinary
Jinrong Huo, Kai Zhang, Haocong Wei, Ling Fu, Chenxu Zhao, Chaozheng He, Xincheng Hu
Summary: This paper describes the catalytic processes of ammonia borane dehydrogenation from different ways and their suitability for various application scenarios. Through this review, we can gain a preliminary understanding of the AB dehydrogenation reaction.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Physical
Xiaofa Su, Sifang Li
Summary: A new type of PVP-stabilized bimetallic Co-Ni nanoparticles as catalyst for hydrogen production from methanolysis of ammonia borane showed good catalytic performance, magnetic recyclability, and synergistic effect between Co and Ni.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
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
Cafer Saka
Summary: In this study, nitrogen-doped metal-free catalysts were obtained through nitric acid activation of carbon samples based on Chlorella Vulgaris microalgae, showing seven-fold improvement in catalytic activity compared to C-KOH catalyst. These catalysts were effectively used to produce hydrogen from the methanolysis reaction of sodium borohydride, with hydrogen generation rate values of 3250 and 20100 mL min(-1) g(-1) for C-KOH and C-KOH-N catalysts, respectively. The results demonstrate a new alternative strategy for producing specific heteroatom-doped metal-free carbon catalysts for efficient hydrogen production in an environmentally friendly manner.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Cafer Saka
Summary: In this study, activated carbons prepared from microalgae with KOH activation were used for the first time as sulphur (S) and phosphorus (P) doped metal-free carbon catalysts in NaBH4 methanolysis reaction, showing a high hydrogen generation rate and low activation energy. After five cycles, the catalyst retained 59% of its initial catalytic activity, demonstrating the potential for environmentally friendly efficient catalytic reactions.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
Haochong Wu, Qilu Yao, Chenxi Hu, Jianjun Long, Yuanlan Zhou, Zhang-Hui Lu
Summary: Bimetallic CoPt alloy nanoparticles immobilized on CeO2 nanorods showed the highest catalytic efficiency reported to date for the complete dehydrogenation of hydrazine borane, with a high TOF value of up to 5454 h-1 at 323 K.
CHEMICAL COMMUNICATIONS
(2023)
Article
Energy & Fuels
Cafer Saka
Summary: Metal-free carbon catalysts doped with sulfur and phosphorus were prepared from activated carbon obtained from microalgae, showing high hydrogen generation rate and low activation energy in NaBH4 methanolysis. The catalytic activity was attributed to the synergistic effects of porous structure and P- and S-containing active sites, providing a new strategy for environmentally friendly efficient catalytic reactions.
Article
Chemistry, Physical
Cafer Saka
Summary: This study presents a new alternative strategy for producing specific metal-free carbon catalysts doped with heteroatoms, demonstrating the potential for environmentally friendly conversion to efficiently produce hydrogen. Through thorough investigation of the preparation and performance of oxygen and nitrogen-doped metal-free carbon catalysts, this research provides insight into catalytic design for efficient hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Cafer Saka
Summary: Micro algae based on Spirulina platensis are used for the synthesis of S and N-doped metal-free carbon materials, which are then applied in catalytic reactions for the first time. Characterization through multiple methods revealed that the doped catalysts have higher hydrogen release performance and activation energy.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Electrochemistry
Sefika Kaya, Ceren Saka, Derya Yildiz, Salim Erol, Berdan Ulas, Izge Demir, Hilal Kivrak
Summary: The unique aspect of this study lies in the use of H3PO4 functionalized waste poplar sawdust as a supercapacitor electrode material and catalyst for NaBH4 methanolysis. N-2 adsorption-desorption, SEM-EDX, FT-IR, and XRD are used to characterize the AC. The effect of H3PO4 ratios and carbonization temperature on the HGR is investigated and optimized. The performance of the KV4-600 as a supercapacitor electrode material is evaluated and found to be satisfactory.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2023)
Article
Energy & Fuels
Duygu Elma Karakas
Summary: In this study, pomegranate peel waste was used as a cost-effective catalyst for the methanolysis reaction of sodium borohydride, and the prepared material was used for electricity storage in supercapacitors. The most active catalyst was obtained under optimized conditions with a hydrogen generation rate of 76,228 mL min(-1) gcat(-1) at 60 degrees C. Characterization of the synthesized catalyst was conducted through various analyses, and the prepared electrode showed a gravimetric capacitance of 29 F/g at 0.25 A/g current density.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Medhen W. Abebe, Anteneh F. Baye, Hern Kim
Summary: In this study, an interpenetrating polymer network (IPN) strategy was utilized to prepare a recyclable polymeric catalyst for catalytic methanolysis of NaBH4 to produce hydrogen gas. The catalyst exhibited excellent cyclic performance and prolonged catalyst life.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Sahin Demirci, S. Duygu Sutekin, Olgun Guven, Nurettin Sahiner
Summary: Poly(2-aminoethyl methacrylate) (p(AEM)) microgels were synthesized and used for metal nanoparticle preparation. These microgels were then incorporated into p(AEM) based poly ionic liquid (PIL) microgels, which served as catalysts for hydrogen production from sodium borohydride (NaBH4) reactions. The catalytic activity and regeneration ability of the microgels were analyzed, showing promising results.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Duygu Elma Karakas
Summary: In this study, orange peel was used as a metal-free catalyst for hydrogen production from sodium boron hydride. The catalyst was prepared by treating the orange peel with phosphoric acid and burning it at a specific temperature and time. The catalytic activity of the catalyst was characterized and the hydrogen generation rates and activation energy were determined.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
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
Bilge Coskuner Filiz
Summary: This study investigated the dehydrogenation kinetics of magnesium hydride in cobalt chloride aqueous solutions, finding that 6.25 wt% CoCl2 was the optimal activator concentration, leading to complete conversion of MgH2 to Mg(OH)(2) at room temperature. The approach was practical for hydrogen generation applications.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Materials Science, Multidisciplinary
Beyza Nur Kinsiz, Bilge Coskuner Filiz, Serpil Kilic Depren, Aysel Kanturk Figen
Summary: This study focused on the preparation of bead type catalysts with rapid and easy recoverable properties for reusability and regeneration during ammonia borane (NH3BH3) hydrolysis. Through nano-casting, cobalt-alginate capsules were used to form surface-active beads containing Co3O4 nanoparticles, resulting in enhanced hydrogen release performance. The catalysts were able to be used for 555 minutes without mechanical damages, and enabled rapid and easy recovery at the end of the reaction for improved reuse.
APPLIED MATERIALS TODAY
(2021)
Article
Chemistry, Physical
Ozge Coskuner, Aysel Kanturk Figen
Summary: This study presents the hydro-catalytic treatment of organoamine boranes for efficient thermal dehydrogenation for hydrogen production. The Co-AC catalyst exhibited efficient catalytic activity towards organoamine boranes thermal dehydrogenation, significantly improving the hydrogen release kinetics. Overall, the hydro and catalytic treatment showed a remarkable synergistic effect in thermal dehydrogenation, enhancing the hydrogen release kinetics.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Biochemistry & Molecular Biology
Bilge Coskuner Filiz, Yeliz Basaran Elalmis, Irem Serra Bektas, Aysel Kanturk Figen
Summary: This study successfully designed a stable CS/PVA nanofiber structure for naked-eye colorimetric glucose detection using cost-effective electrospinning technology. The nanofibers exhibited good stability and readability, showing linear glucose analysis response in experiments and achieving significant color changes.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Chemistry, Physical
Ozge Coskuner, Carlos A. Castilla-Martinez, Oscar Sonzogni, Eddy Petit, Umit B. Demirci, Aysel Kanturk Figen
Summary: A two-step process has been developed to produce formic acid by hydrogenation of CO2 using sodium borohydride in aqueous solution at ambient conditions. The process aims at capturing and transforming CO2 effectively at ambient conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Ozge Coskuner, Aysel Kanturk Figen
Summary: This study evaluates the semi-continuous regime for hydrogen generation from carbon derivatives of ammonia borane using cobalt-doped activated carbon catalyst. Different carbon derivatives exhibit different hydrogen generation rates due to their varying thermal stability. The kinetic rate and activation energy of the hydrolysis reaction are described using power-law and zero-order kinetic models. After the semi-continuous regime, the catalyst remains stable and no leaching of cobalt species into the exhaust solution is observed, although boron accumulation occurs.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Bilge Coskuner Filiz, Aysel Kanturk Figen
Summary: This study aims to develop easily recoverable and regenerated catalysts for efficient hydrogen production from alkyl-substituted amine boranes. The results showed that alkyl-substituted amine boranes exhibited slower hydrogen generation rates compared to ammonia borane in the presence of catalysts. Among the different activated carbon support types, the catalyst supported on granule activated carbon demonstrated the best catalytic performance and recyclability activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Carlos A. CASTILLA-MARTINEZ, Bilge COSKUNER FILIZ, Eddy PETIT, Aysel KANTURK FIGEN, Umit B. DEMIRCI
Summary: Ammonia borane mixed with palladium chloride was used as a reactive solid to trap and convert carbon dioxide, resulting in the formation of various compounds. The study also demonstrated the conversion of CO2 into graphitic carbon.
FRONTIERS OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Hulya Civelek Yoruklu, Bilge Coskuner Filiz, Aysel Kanturk Figen, Bestami Ozkaya
Summary: Nanoparticles (NPs) are used as enhancement additives in biohydrogen production due to their unique features. In this study, the effectiveness and feasibility of NPs in enhancing biohydrogen production over Clostridium sp. were evaluated using the two-stage TOPSIS method. Iron-containing NPs (hematite, magnetite) were determined to be the most effective and economical NPs for increasing the yield.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Electrical & Electronic
Havva Hande Cebeci, Ibrahim Yilmaz, Oender Yargi, Korkut Acikalin, Ali Gelir, Aysel Kanturk Figen
Summary: Upcycling of electronic waste into metal contented pyrolytic carbon (C-WPCB) was achieved through simple pyrolysis, and the obtained C-WPCB was utilized for supercapacitor electrode preparation. The electrode prepared in 1.5 M H2SO4 solution showed the best performance with specific capacitance, specific power, and specific energy of 39.5 F/g, 25.0 kW/kg, and 16.5 Wh/kg at 5 A/g, respectively.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Environmental Sciences
Havva Hande Cebeci, Korkut Acikalin, Aysel Kanturk Figen
Summary: This study aimed to characterize and determine the kinetic parameters of pyrolysis of printed circuit board (PCB) wastes, and analyze the evolved gases at different particle sizes. SEM-EDS, SEM-Mapping, and FTIR were used to examine the structures of PCB wastes. Non-isothermal TG-FTIR analyses were conducted to study the thermal decomposition of PCB wastes, revealing four stages of decomposition with the second stage being the main pyrolysis stage. The apparent activation energies (Ea) for the main pyrolysis stage varied with particle size, contrary to previous studies, and the evolved gas analyses showed that CO2 was the most common emission associated with the decomposition of plastic, brominated compounds, polycarbonate, and epoxy resins in PCB wastes.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2023)
Article
Chemistry, Physical
Hulya Civelek Yoruklu, Bilge Coskuner Filiz, Aysel Kanturk Figen, Bestami Ozkaya
Summary: Enhancing biohydrogen production by adding nano-sized iron oxide doped metal oxides, especially Fe2O3 doped Al2O3, shows great potential.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
