• Ръководител на проекта:
    проф. д-р Йолина Хубенова, дбн

    y.hubenova@iees.bas.bg

  • БЕлСел

    „Биоелектрохимични системи за очистване на органични замърсители“

    Договор № КП-06-Н-67/6 от 12.12.20 2022 г., МОН-ФНИ, "Конкурс за финансиране на фундаментални научни изследвания – 2022 г."

    Координатор/Базова организация: Институт по електрохимия и енергийни системи "Акад. Евгени Будевски" при БАН

    Срок: 48 месеца

Публикации

Биоелектрохимични системи за очистване на органични замърсители
  • Eleonora Hubenova
  • Yolina Hubenova

Ti-6Al-4V type alloys used as dental implants

Eleonora Hubenova, Yolina Hubenova. Ti-6Al-4V type alloys used as dental implants, accepted for publication in: Corrosion Atlas Case Studies, expected edition in 2025: Corrosion Studies, Elsevier, 2025, Editor: Fuad Khoshnaw, Paperback ISBN: 9780443300189, E-Book ISBN: 780443300196
https://shop.elsevier.com/books/corrosion-atlas-case-studies/khoshnaw/978-0-443-30018-9
  • Yolina Hubenova
  • Eleonora Hubenova
  • Elitsa Chorbadzhiyska
  • Hristina Sbirkova-Dimitrova
  • Liliya Tsvetanova
  • Evelina Slavcheva

Simultaneous gold and silver recovery in microbial fuel cells operating in a short-circuited mode

Abstract

We suggest a novel bioelectrochemical approach for simultaneous precious metals recovery from Au(I)- and Ag(I)-dithiosulfate complexes with equivalent concentrations of Ag+ and Au+ in a two-chamber microbial fuel cell. The graphitized paper, used as a cathode, was short-circuited with the bioanode of a sediment microbial fuel cell thus operating the system as a microbial electrochemical snorkel without additional energy input. The generated current, the cathodic, and the anodic potentials were continuously recorded. Cyclic voltammetry was carried out as a fast method for the determination of the ion concentration depletion in the catholyte. The bimetallic deposits on the cathode surface have been characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, powder X-ray diffraction, etc. It was established that the silver and gold particles are deposited at zero valence state only under polarization in proportion 0.89:1.00 on the cathode. The Au-Ag recovery of 96.7 ± 3.3 % was achieved for 24h of operation in short-circuited mode, and the cathodic efficiency approached 100 %. The obtained bimetallic deposits reveal better performance as electrocatalysts for hydrogen evolution reactions compared to deposits obtained from the individual thiosulfate complexes of both metals suggesting their combined use as modified cathodes.
Yolina Hubenova, Eleonora Hubenova, Elitsa Chorbadzhiyska, Hristina Sbirkova-Dimitrova, Liliya Tsvetanova, Evelina Slavcheva. Simultaneous gold and silver recovery in microbial fuel cells operating in a short-circuited mode, Journal of Power Sources, (IF8.1, Q1)doi: https://doi.org/10.1016/j.jpowsour.2024.235775
https://www.sciencedirect.com/science/article/pii/S0378775324017270?via%3Dihub
  • Eleonora Hubenova
  • Yolina Hubenova

Bacteria and Eukaryotes as anodic biocatalysts in microbial fuel cells – a comprehensive review

Abstract

The comprehensive review emphasizes the use of various microorganisms and higher aquatic plants as anodic biocatalysts in microbial fuel cells (MFCs). Not only the electrical outputs obtained using mixed bacterial cultures from sewage sludge and sediments but also pure cultures representing Gram-positive and Gram-negative bacteria are inspected and compared. The components involved in implementing extracellular electron transfer processes are also discussed. A special place in the world of living biocatalysts is assigned to the eukaryotic organisms - yeast and higher aquatic plants. The contribution of photosynthetic processes to the current generation and valuable product synthesis is argued. The role of respiratory processes in the mitochondria of eukaryotes in energy transformation is also discussed. The summary demonstrates that eukaryotes are capable of generating electrical energy comparable to that produced by prokaryotes, using species-specific fuel cell designs and optimized growth conditions. Critical issues and challenges to be solved are outlined to turn the MFCs into sustainable systems for generating electricity, treating waste, and obtaining valuable raw materials.
Eleonora Hubenova and Yolina Hubenova. Bacteria and Eukaryotes as anodic biocatalysts in microbial fuel cells – a comprehensive review. Journal of power sources, (IF8,1, Q1), https://doi.org/10.1016/j.jpowsour.2024.236002
https://www.sciencedirect.com/science/article/pii/S0378775324019542?via%3Dihub
  • Yolina Hubenova
  • Ivo Bardarov
  • Eleonora Hubenova
  • Evelina Slavcheva

Sediment microbial fuel cells capable of powering outdoor environmental monitoring sensors

Abstract

In this study, Sediment Microbial Fuel Cells (SMFCs) prototypes have been developed to operate under open-air conditions and power sensors for environmental monitoring. Two SMFCs with a volume of 50 l each, consisting of two types of anodic materials – graphite and coke, were operated on-field for over a year. The electrical outputs have been recorded and compared with the measured environmental parameters such as temperature, light illumination, atmospheric pressure, humidity, etc. The statistical analysis of the obtained data shows that temperature changes between 0 and 14 °C do not affect the power achieved. On the contrary, the sunlight irradiation showed a second-order polynomial correlation with the current generated by the SMFCs, increasing the latter during the days. The cathode reactions significantly impacted the power density achieved by both explored SMFCs and the system's sustainability. The metallurgical coke is suggested to be used as an inexpensive and convenient anode material for SMFCs giving compatible results to the widely used graphite.
Yolina Hubenova, Ivo Bardarov, Eleonora Hubenova, Evelina Slavcheva. Sediment microbial fuel cells capable of powering outdoor environmental monitoring sensors. Sensing and Bio-Sensing Research,  (IF5.4, Q2) https://doi.org/10.1016/j.sbsr.2024.100695
https://www.sciencedirect.com/science/article/pii/S2214180424000771?via%3Dihub
  • Ivelina Tsacheva
  • Adriana Gigova
  • Ognian Dimitrov
  • Mariela Dimitrova
  • Stefan Stefanov
  • Dzhamal Uzun

Mn3O4/Vulcan XC-72R composites: Preparation, physicochemical characterization and electrochemical study for purification of organic contaminants

Abstract

The microwave-assisted technique was applied to the preparation of composites from manganese(II) acetate and Carbon-supported (Vulcan XC-72R). Composites were prepared by chemical deposition of manganese(II) acetate nanoparticles onto Vulcan XC-72R carbon black (catalytic mass) using microwave irradiation. The new composites were physicochemically characterized by Energy-dispersive X-ray spectroscopy (EDX) with scanning electron microscopy (SEM), BET surface area, pore size distribution and X-ray diffraction (XRD). BET analysis of Mn3O4/Vulcan XC-72R composites obtained by alkali method has shown specific surface area of 1135 m2/g. Novel composites were electrochemically studied as catalysts for the remediation of organic contaminants in industrial waters. From novel catalytic mass, double-sided coated electrodes on a Nickel mesh conductor were made by pressing and heating at 250 °C. The prepared electrodes have geometric area of 2.5 cm2. The electrodes were fabricated and studied regarding the amount of catalyst and 35 % Teflonized Vulcan XC-72R. Electrochemical studies were carried out for phenol oxidation in an aqueous solution in model electrolyte: phenol solution 200 mg.L-1 and supporting electrolyte: 18 g.L-1 NaCl and 2.6 mg.L-1 Na2SO4. © Published under licence by IOP Publishing Ltd.
https://www.scopus.com/record/display.uri?eid=2-s2.0-85186142972&origin=resultslist
https://iopscience.iop.org/article/10.1088/1742-6596/2710/1/012034
  • Ivelina Tsacheva
  • Mariela Dimitrova
  • Adriana Gigova
  • Ognian Dimitrov
  • Dzhamal Uzun

Natural Zeolite-Cellulose Phosphate Nanocomposites: Preparation and Advance Electrochemical Study

Abstract

The scope of this research study is to investigated the green method for preparing and applying cost-effective and environmentally friendly electrocatalytic materials from natural zeolite (clinoptilolite) and cellulose phosphate using microwave irradiation. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDX) and Brunauer-Emmett-Teller (BET), were used for the physicochemical characterization of nanocomposites. The newly obtained nanocomposites were studied electrochemically using cyclic voltammetry, linear sweep, galvanostatic measurements, and Tafel slopes. The results show that the obtained nanocomposites can find applications as promising electrocatalytic materials for seawater electrolysis for hydrogen production at oxygen evolution reactions (OER) and for electrochemical purification of organic pollutants.
https://www.scopus.com/record/display.uri?eid=2-s2.0-85174325331&origin=resultslist
https://www.iieta.org/journals/jnmes/paper/10.14447/jnmes.v26i3.a08

Партньори

  • ИЕЕС - БАН
  • ИИХ - БАН

МОН-ФНИ 2022 г.

Публикации под печат

Microbial and Catalytic Degradation of Synthetic Dyes

N. Shukova N. Armenova D. Uzun A. Gigova O. Dimitrov M. Dimtrova L. Ljutzkanov E. Razkazova-Velkova
N. Shukova, N. Armenova, D. Uzun, A. Gigova, O. Dimitrov, M. Dimtrova, L. Ljutzkanov, E. Razkazova-Velkova, Microbial and Catalytic Degradation of Synthetic Dyes, Bulgarian Chemical Communications, 52, E in print’

Electrocatalytic Oxidation of H2S by a ZrO2 Catalyst on Biochar Carbon

N. Shukova D. Uzun A. Gigova O. Dimitrov M. Dimtrova L. Ljutzkanov E. Razkazova-Velkova K. Petrov
N. Shukova, D. Uzun, A. Gigova, O. Dimitrov, M. Dimtrova, L. Ljutzkanov, E. Razkazova-Velkova, K. Petrov, Electrocatalytic Oxidation of H2S by a ZrO2 Catalyst on Biochar Carbon, Bulgarian Chemical Communications, 57, E in print’