An efficient ZnS-UV photocatalysts generated in situ from ZnS(en)0.5 hybrid during the H2 production in methanol–water solution

2012 ◽  
Vol 37 (22) ◽  
pp. 17002-17008 ◽  
Author(s):  
Agileo Hernández-Gordillo ◽  
Francisco Tzompantzi ◽  
Ricardo Gómez
Keyword(s):  
Water Solution ◽  
H2 Production

scholarly journals TiO2 Nanowires with Doped g-C3N4 Nanoparticles for Enhanced H2 Production and Photodegradation of Pollutants

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 254
Author(s):  
Liushan Jiang ◽  
Fanshan Zeng ◽  
Rong Zhong ◽  
Yu Xie ◽  
Jianli Wang ◽  
...  
Keyword(s):  
Environmental Governance ◽  
Fossil Fuels ◽  
H2 Production ◽  
Tio2 Nanowires ◽  
Photocatalytic Ability ◽  
Production Of Hydrogen ◽  
Growth Method ◽  
Renewable Hydrogen ◽  
Degradation Of Pollutants

With the rapid consumption of fossil fuels, along with the ever-increasing environmental pollution, it is becoming a top priority to explore efficient photocatalysts for the production of renewable hydrogen and degradation of pollutants. Here, we fabricated a composite of g-C3N4/TiO2 via an in situ growth method under the conditions of high-temperature calcination. In this method, TiO2 nanowires with a large specific surface area could provide enough space for loading more g-C3N4 nanoparticles to obtain C3N4/TiO2 composites. Of note, the g-C3N4/TiO2 composite could effectively photocatalyze both the degradation of several pollutants and production of hydrogen, both of which are essential for environmental governance. Combining multiple characterizations and experiments, we found that the heterojunction constructed by the TiO2 and g-C3N4 could increase the photocatalytic ability of materials by prompting the separation of photogenerated carriers. Furthermore, the photocatalytic mechanism of the g-C3N4/TiO2 composite was also clarified in detail.

Ruthenium catalyzed hydrogen production from formaldehyde–water solution

2021 ◽  
Author(s):  
Mahendra Kumar Awasthi ◽  
Sanjay Kumar Singh
Keyword(s):  
Hydrogen Production ◽  
Water Solution ◽  
Ruthenium Catalyst ◽  
Aqueous Formaldehyde

Efficient hydrogen production from aqueous formaldehyde with appreciably high TOF and TON achieved over an in situ generated ruthenium catalyst in water at 95 °C.

scholarly journals Correction: In situ electrochemical H2 production for efficient and stable power-to-gas electromethanogenesis

2021 ◽  
Author(s):  
Frauke Kracke ◽  
Jörg S. Deutzmann ◽  
Wenyu Gu ◽  
Alfred M. Spormann
Keyword(s):  
H2 Production ◽  
Power To Gas

Correction for ‘In situ electrochemical H2 production for efficient and stable power-to-gas electromethanogenesis’ by Frauke Kracke et al., Green Chem., 2020, 22, 6194–6203, DOI: 10.1039/D0GC01894E.

scholarly journals How [FeFe]-Hydrogenase Facilitates Bidirectional Proton Transfer

2019 ◽  
Author(s):  
Moritz Senger ◽  
Viktor Eichmann ◽  
Konstantin Laun ◽  
Jifu Duan ◽  
Florian Wittkamp ◽  
...  
Keyword(s):  
Amino Acid ◽  
Proton Transfer ◽  
Active Site ◽  
Molecular Hydrogen ◽  
H2 Production ◽  
Amino Acid Residues ◽  
Difference Spectroscopy ◽  
Dynamic Changes ◽  
In Situ Ir

Hydrogenases are metalloenzymes that catalyse the interconversion of protons and molecular hydrogen, H2. [FeFe]-hydrogenases show particularly high rates of hydrogen turnover and have inspired numerous compounds for biomimetic H2 production. Two decades of research on the active site cofactor of [FeFe]-hydrogenases have put forward multiple models of the catalytic proceedings. In comparison, understanding of the catalytic proton transfer is poor. We were able to identify the amino acid residues forming a proton transfer pathway between active site cofactor and bulk solvent; however, the exact mechanism of catalytic proton transfer remained inconclusive. Here, we employ in situ IR difference spectroscopy on the [FeFe]-hydrogenase from Chlamydomonas reinhardtii evaluating dynamic changes in the hydrogen-bonding network upon catalytic proton transfer. Our analysis allows for a direct, molecular unique assignment to individual amino acid residues. We found that transient protonation changes of arginine and glutamic acid residues facilitate bidirectional proton transfer in [FeFe]-hydrogenases.<br>

CO2 Capture Using Calcium Oxide Applicable to In-Situ Separation of CO2 From H2 Production Processes

2013 ◽  
Author(s):  
Saeed Danaei Kenarsari ◽  
Yuan Zheng
Keyword(s):  
Calcium Oxide ◽  
Co2 Capture ◽  
Fixed Bed ◽  
H2 Production ◽  
Fixed Bed Reactor ◽  
Capture Process ◽  
Conversion Rates ◽  
In Situ Separation ◽  
Separation Of Co2

A lab-scale CO2 capture system is designed, fabricated, and tested for performing CO2 capture via carbonation of very fine calcium oxide (CaO) with particle size in micrometers. This system includes a fixed-bed reactor made of stainless steel (12.7 mm in diameter and 76.2 mm long) packed with calcium oxide particles dispersed in sand particles; heated and maintained at a certain temperature (500–550°C) during each experiment. The pressure along the reactor can be kept constant using a back pressure regulator. The conditions of the tests are relevant to separation of CO2 from combustion/gasification flue gases and in-situ CO2 capture process. The inlet flow, 1% CO2 and 99% N2, goes through the reactor at the flow rate of 150 mL/min (at standard conditions). The CO2 percentage of the outlet gas is monitored and recorded by a portable CO2 analyzer. Using the outlet composition, the conversion of calcium oxide is figured and employed to develop the kinetics model. The results indicate that the rates of carbonation reactions considerably increase with raising the temperature from 500°C to 550°C. The conversion rates of CaO-carbonation are well fitted to a shrinking core model which combines chemical reaction controlled and diffusion controlled models.

Investigation of 137Cs and plutonium isotope sorption–desorption in bio- and synthetic materials

2016 ◽  
Vol 56 (2) ◽  
Author(s):  
Benedikta Lukšienė ◽  
Zita Žukauskaitė ◽  
Nikolaj Tarasiuk ◽  
Evaldas Maceika ◽  
Vitold Filistovič ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Lake Water ◽  
Water Solution ◽  
Plutonium Isotope ◽  
Dynamic Flow ◽  
Batch Type ◽  
Environmental Friendly ◽  
Synthetic Materials ◽  
Physico Chemical

Investigations on the pre-concentration of radionuclides (137Cs and plutonium isotopes) from fresh water on solid matrices are presented in this study. A particular focus was given to an innovative physico-chemical removal process such as adsorption of radionuclides from an aqueous medium on new type adsorbents, environmental-friendly materials. Sorption of the tested radionuclides from the lake water solution by environmental assays and synthetic sorbents was compared. Lake water was analyzed for main anions, micro- and macroelements, using ion and atomic absorption chromatography methods, respectively. Batch type and dynamic flow column laboratory experiments were performed. The sorption–desorption capacity of radionuclides by the tested sorbents was estimated based on the results of α- and γ-spectrometric measurements. According to the removal efficiency results, moss can be considered as the best sorbent for plutonium of the tested environmental-friendly sorbents, whereas the moss sorption capacity exceeded even that of the tested synthetic ones. The highest 137Cs removal efficiency from the lake water solution was obtained for granular activated carbon. Application of the dynamic flow method carried out in situ confirmed the reversibility of sorbed background 137Cs activity in the moss observed during the batch type experiments, and the method of the moss bed column turned to be unfit for the pre-concentration of 137Cs from the lake water. Application of a single moss bed column for the 137Cs and plutonium isotope pre-concentration for the first time carried out in situ allowed us to determine the activity concentration of 239,240Pu and 238Pu in the lake water – 4.87±0.98 and 0.67±0.21 mBq/m3, respectively. The reversible 137Cs and different plutonium sorption in the moss apparently indicates different binding properties of these radionuclides to the moss, therefore further investigations on this issue are foreseen.

An in-situ DRIFTS-MS study of the photocatalytic H2 production from ethanol(aq) vapour over Pt/TiO2 and Pt Ga/TiO2 catalysts

2018 ◽  
Vol 43 (35) ◽  
pp. 16922-16928 ◽  
Author(s):  
Alberto C. Sola ◽  
Narcís Homs ◽  
Pilar Ramírez de la Piscina
Keyword(s):  
H2 Production ◽  
In Situ Drifts

Low-temperature alkaline pyrolysis of sewage sludge for enhanced H2 production with in-situ carbon capture

2019 ◽  
Vol 44 (16) ◽  
pp. 8020-8027 ◽  
Author(s):  
Ming Zhao ◽  
Fan Wang ◽  
Yiran Fan ◽  
Abdul Raheem ◽  
Hui Zhou
Keyword(s):  
Sewage Sludge ◽  
Low Temperature ◽  
Carbon Capture ◽  
H2 Production

scholarly journals 2D/2D Pomelo Peel Graphene/g-C3N4/Cu in situ for Enhancing Photocatalytic H2 Production under Visible Light Irradiation

2020 ◽  
Author(s):  
Bingbiao Li ◽  
Zhixiong Xu ◽  
Heping Zeng
Keyword(s):  
Hydrogen Evolution ◽  
Graphene Nanosheets ◽  
H2 Production ◽  
Dimensional Structure ◽  
Gas Stripping ◽  
Pomelo Peel ◽  
Stripping Method ◽  
Activating Agent ◽  
Preset Temperature

Pomelo peel was firstly used as the precursor with activating agent KHCO3 to prepare few layered graphene nanosheets (GS) through gas stripping method. The precursor graphitized and transformed to few layered graphene nanosheets gradually because of the preset temperature program and KHCO3. GS-4-1100, possessed the highest graphitization (ID/IG = 0.14, I2D/IG = 0.923) in 2~3 layers, at the edges. Taking advantages of the excellent electronic transmission performance and unique two-dimensional structure of both graphene and porous graphitic carbon nitride (g-C3N4), 2D/2D graphene/g-C3N4 nanosheet composite was fabricated for photocatalytic hydrogen evolution. The results showed that nano-copper (Cu NPs) performed the hydrogen evolution rate of 1.09 mmol g−1 h−1, while that of GS/CN-2 reached 2.91 mmol g−1 h−1 with in situ 5.49wt% Cu NPs. GS/CN-2/Cu turned out to be a stable and clean photocatalyst for hydrogen production.

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