Evaluation of different support materials used with a photo-fermentative consortium for hydrogen production

2015 ◽  
Vol 40 (48) ◽  
pp. 17231-17238 ◽  
Author(s):  
Eliane Guevara-López ◽  
Germán Buitrón
Keyword(s):  
Hydrogen Production ◽  
Support Materials ◽  
Materials Used

scholarly journals Evaluating the materials used for hydrogen production based on photoelectrochemical technology

2019 ◽  
Vol 8 (2) ◽  
pp. 169 ◽  
Author(s):  
Mohammdreza Nazemzadegan ◽  
Roghayeh Ghasempour
Keyword(s):  
Decision Making ◽  
Hydrogen Production ◽  
Fossil Fuels ◽  
Material Selection ◽  
H2 Production ◽  
University Professors ◽  
Selection Approach ◽  
Materials Used ◽  
Physical And Chemical ◽  
Pec Water Splitting

Hydrogen as a CO2-free fuel has been considered as a serious alternative for problematic fossil fuels in recent decades Photoelectrochemical (PEC) water splitting is a developing solar-based technology for hydrogen production. In this study, some possible options for upgrading this technology from R&D stage to prototype stage through a material selection approach is investigated. For these purpose, TOPSIS algorithm through a multi criteria decision making (MCDM) approach was utilized for evaluating different (PEC)-based hydrogen production materials. TiO2, WO3 and BiVO4 as three semiconductors known for their PEC application, were selected as alternatives in this decision-making study. After defining a set of criteria, which were assessed based on similar studies and experts' visions, a group of ten PEC-experts including university professors and PhD students were asked to fill the questionnaires. The eight criteria considered in this study are include "Study Cost", "Synthesis Simplicity", "Facility & Availability", "Deposition capability on TCO", "Modifiability", "Commercialization in H2 production", "Physical and Chemical Durability" and "Eco-friendly Fabrication". The final TOPSIS results indicates that TiO2 is selected as the best semiconductor for further investments in order to upgrade the PEC-based hydrogen production technology from R&D level to prototype stage. ©2019. CBIORE-IJRED. All rights reserved

Corrosion of the Materials in Sulfuric Acid

2008 ◽  
Author(s):  
Hong Pyo Kim ◽  
Dong-Jin Kim ◽  
Hyuk Chul Kwon ◽  
Ji Yeon Park ◽  
Yong Wan Kim
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Hydrogen Production ◽  
Immersion Time ◽  
Cross Sectional ◽  
Corrosion Morphology ◽  
Nuclear Heat ◽  
Corrosion Behaviors ◽  
Materials Used ◽  
Surface Morphologies

The program for hydrogen production with high temperature nuclear heat has been launched in Korea since 2004. Iodine sulfur (IS) process is one of the promising processes for a hydrogen production because it does not generate a carbon dioxide and massive hydrogen production may be possible. However, the highly corrosive environment of the process is barrier to the application in the industry. Therefore, corrosion behaviors of various materials were evaluated in sulfuric acid to select appropriate materials compatible with the IS process. The materials used in this work were Ni base alloys, Fe-Si alloys, Ta, Au, Pt, Zr, SiC and so on. The test environments were boiling 50wt% sulfuric acid without/with HI as an impurity and 98wt% sulfuric acid. The surface morphologies and cross sectional areas of the corroded materials were examined by using SEM equipped with EDS. From the results of the weight loss and potentiodynamic experiments, it was found that a Si enriched oxide is attributable to a corrosion resistance for materials including Si in boiling 98wt% sulfuric acid. Moreover the passive Si enriched film thickness increased with the immersion time leading to an enhancement of the corrosion resistance. Corrosion behaviours of the material tested are discussed in terms of the chemical composition of the materials, a corrosion morphology and the surface layer’s composition.

Microbial colonization of different support materials used to enhance the methanogenic process

1994 ◽  
Vol 41 (4) ◽  
pp. 480-486
Author(s):  
J. M. Sanchez ◽  
S. Arijo ◽  
M. A. Mu�oz ◽  
M. A. Mori�igo ◽  
J. J. Borrego
Keyword(s):  
Microbial Colonization ◽  
Support Materials ◽  
Materials Used ◽  
Methanogenic Process

Microbial colonization of different support materials used to enhance the methanogenic process

1994 ◽  
Vol 41 (4) ◽  
pp. 480-486 ◽  
Author(s):  
J. M. Sanchez ◽  
S. Arijo ◽  
M. A. Mu�oz ◽  
M. A. Mori�igo ◽  
J. J. Borrego
Keyword(s):  
Microbial Colonization ◽  
Support Materials ◽  
Materials Used ◽  
Methanogenic Process

scholarly journals INFLUENCE OF CURRICULUM DIGITAL CONTENT UTILISATION ON LEARNERS’ ASSESSMENT AND ACHIEVEMENT IN BIOLOGY AMONG SECONDARY SCHOOLS IN KENYA

2018 ◽  
Vol 6 (7) ◽  
pp. 121-135
Author(s):  
Dr. Samuel Nyaga Jesse ◽  
Prof. John Nyamai Maundu ◽  
Prof. Nicholas Wanjala Twoli
Keyword(s):  
Secondary School ◽  
Secondary Schools ◽  
Phase 1 ◽  
Group Discussion ◽  
Positive Influence ◽  
Rapid Expansion ◽  
Digital Content ◽  
Instructional Process ◽  
Support Materials ◽  
Materials Used

The curriculum support materials used in an instructional process may influence assessment and achievement of learners. Curriculum support materials are both print and electronic in nature. One of the main electronic curriculum support materials used in schools is interactive digital content. In recent years, there has been rapid expansion in curriculum digital content access and utilization in Kenyan schools. However, little has been done to establish how utilization of curriculum digital content in the instructional process influences learners’ assessment and achievement. The study reported in this paper therefore investigated the influence of curriculum digital content utilisation on secondary school learners’ assessment and achievement in Biology. It was guided by two specific objectives including to: investigate the influence of the utilisation of Biology digital content on learners’ assessment and examine the influence of the utilisation of Biology digital content on learners’ achievement. A mixed methods approach that employed triangulation design was used in this study. Data was obtained from fifteen Economic Stimulus Programme-ICT phase 1 secondary schools in Nairobi County. Three instruments including Biology teacher questionnaire, learners’ focus group discussion guide and documents analysis sheet were used for data collection. The collected data was analyzed using both descriptive and inferential statistics and presented in form of notes, tables, and graphics. This study found out that most assessment aspects improved with curriculum digital content utilization. In addition, utilisation of curriculum digital content had a positive influence on the achievement of secondary school learners in Biology. The study recommended that all schools, and not only ESP-ICT schools, be provided with proper infrastructure to enable learners and teachers access and utilize curriculum digital content in the instructional process. This would enhance assessment modes and learners achievement in secondary schools in Kenya.

scholarly journals Evaluation of Immobilization of Selected Peat-Isolated Yeast Strains of the Species Candida albicans and Candida subhashii on the Surface of Artificial Support Materials Used for Biotrickling Filtration

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 801
Author(s):  
Milena Marycz ◽  
Anna Brillowska-Dąbrowska ◽  
Jacek Gębicki
Keyword(s):  
Flow Cytometry ◽  
Candida Albicans ◽  
Propidium Iodide ◽  
Annexin V ◽  
Support Materials ◽  
Hydrophobic Compounds ◽  
Yeast Strains ◽  
Different Types ◽  
Materials Used ◽  
Hydrophilic And Hydrophobic Compounds

The paper describes the process of n-butanol abatement by unicellular fungi, able to deplete n-butanol content in gas, by using n-butanol as source of carbon. Isolated and identified fungi species Candida albicans and Candida subhashii were subjected to a viability process via assimilation of carbon from hydrophilic and hydrophobic compounds. The isolates, which exhibited the ability to assimilate carbon, were immobilized on four different types of artificial support materials used for biotrickling filtration. Application of optical microscopy, flow cytometry and the tests employing propidium iodide and annexin V revealed viability of the fungi isolated on support materials’ surfaces at the average level of 95%. The proposed method of immobilization and its evaluation appeared to be effective, cheap and fast. Based on performed comparative analyses, it was shown that polyurethane foam and Bialecki rings (25 × 25) could be attractive support materials in biotrickling filtration.

Corrosion of the Materials in Sulfuric Acid

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Hong Pyo Kim ◽  
Dong-Jin Kim ◽  
Hyuk Chul Kwon ◽  
Ji Yeon Park ◽  
Yong Wan Kim
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Hydrogen Production ◽  
Cross Sectional ◽  
Corrosion Morphology ◽  
X Ray ◽  
Nuclear Heat ◽  
Corrosion Behaviors ◽  
Materials Used ◽  
Surface Morphologies

A program for a hydrogen production by using a high temperature nuclear heat has been launched in Korea since 2004. Iodine sulfur (IS) process is one of the promising processes for a hydrogen production because it does not generate carbon dioxide and a massive hydrogen production may be possible. However, the highly corrosive environment of the process is a barrier to its application in the industry. Therefore, corrosion behaviors of various materials were evaluated in sulfuric acid to select appropriate materials compatible with the IS process. The materials used in this work were Ni based alloys, Fe–Si alloys, Ta, Au, Pt, Zr, SiC, and so on. The test environments were boiling 50 wt % sulfuric acid without/with HI as an impurity and 98 wt % sulfuric acid. The surface morphologies and cross-sectional areas of the corroded materials were examined by using the scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS). From the results of the weight loss and potentiodynamic experiments, it was found that a Si enriched oxide is attributable to a corrosion resistance for materials including Si in boiling 98 wt % sulfuric acid. Moreover, the passive Si enriched film thickness increased with the immersion time leading to an enhancement of the corrosion resistance. Corrosion behaviors of the material tested are discussed in terms of the chemical composition of the materials, the corrosion morphology, and the surface layer’s composition.

Microbial colonization of different support materials used to enhance the methanogenic process

1994 ◽  
Vol 41 (4) ◽  
pp. 480-486 ◽  
Author(s):  
J. M. Sanchez ◽  
S. Arijo ◽  
M. A. Mu�oz ◽  
M. A. Mori�igo ◽  
J. J. Borrego
Keyword(s):  
Microbial Colonization ◽  
Support Materials ◽  
Materials Used ◽  
Methanogenic Process

Hydrogen Production From Methane by Using Oxygen Permeable Ceramics

2006 ◽  
Vol 3 (2) ◽  
pp. 175-179 ◽  
Author(s):  
Hitoshi Takamura ◽  
Yusuke Aizumi ◽  
Atsunori Kamegawa ◽  
Masuo Okada
Keyword(s):  
Hydrogen Production ◽  
Flux Density ◽  
Oxygen Flux ◽  
Membrane Thickness ◽  
Pure Hydrogen ◽  
Surface Exchange ◽  
Oxide Ion Conductivity ◽  
Oxidation Of Hydrocarbons ◽  
Materials Used ◽  
P Type

Oxygen permeable ceramics based on mixed conductors are attracting much attention for use in partial oxidation of hydrocarbons as a novel technique for syngas and pure hydrogen production. This paper describes the preparation and oxygen permeation properties including the methane reforming property of a novel member of oxygen permeable ceramics. The materials used are solid solutions of (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ. The single phase of perovskite-type (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ is obtained in the range of x=0.4 to 0.9. The highest oxygen flux densities of 2.2 and 11μmol∕cm2s (membrane thickness, L=0.2mm) are attained for (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ(x=0.6) at 1000°C under He/air and CH4/air gradients, respectively. The electrical conductivity of (La0.5Ba0.3Sr0.2)(Fe0.6In0.4)O3−δ is dominated by p-type conduction having a slope of 1∕4 under the high P(O2) region. The oxide-ion conductivity of the same sample is estimated to be 0.05S∕cm at 800°C. Even though the oxygen flux density slightly decreases with increasing time, high CO selectivity of 90% is kept for 100h. The oxygen flux density of the solid solution is also discussed in the context of surface exchange kinetics.

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