scholarly journals Facile One-step Redox Synthesis of Bi2o2co3/bi2o3/bi Ternary Photocatalyst Without Additional Carbon Source

2021 ◽  
Author(s):  
Qiao Chen ◽  
Xuefang Lan ◽  
Guihua Zhu ◽  
Lili Wang ◽  
Jinsheng Shi
Keyword(s):  
Carbon Source ◽  
Ethylene Glycol ◽  
Migration Rate ◽  
Raw Materials ◽  
Charge Carriers ◽  
Ternary Composite ◽  
Photocatalytic Activities ◽  
Source Component ◽  
One Step ◽  
Additional Carbon Source

Abstract Construction of heterojunction and decoration of cocatalyst are two vital strategies to accelerate migration of charge carriers. However, the fabrication routs of multi-composites are usually complex and expensive. In this work, Bi2O2CO3/Bi2O3/Bi ternary composite was fabricated via a facile one-step redox reaction. Ethylene glycol was selected as the solvent during the whole reaction process. Moreover, ethylene glycol as an excellent reductant can reduce Bi3+ into metallic Bi0 and itself is oxidized to CO32-, which would react with Bi2O3 to generate Bi2O2CO3 without additional carbon source. Component proportions in ternary composites were optimized by the control of the ratios of raw materials. Under simulate solar light, Bi-based ternary composites exhibited enhanced photodegradation efficiencies for multifarious pollutants in comparison with single and binary samples. The enhanced photocatalytic activities were ascribed to accelerated migration rate of charge carriers owing to the construction of heterojunction and decoration of cocatalyst.

Non-additional carbon source one-step synthesis of Bi2O2CO3-based ternary composite for efficient Z-scheme photocatalysis

2019 ◽  
Vol 536 ◽  
pp. 575-585 ◽  
Author(s):  
Yuanyuan Zhang ◽  
Lili Wang ◽  
Fengying Dong ◽  
Qiao Chen ◽  
Haiyan Jiang ◽  
...  
Keyword(s):  
Carbon Source ◽  
Ternary Composite ◽  
One Step ◽  
Additional Carbon Source

Preparation and Photocatalysis Properties of TiO2/Graphene Nanocomposites

2012 ◽  
Vol 430-432 ◽  
pp. 1005-1008
Author(s):  
Dong Fang Wang ◽  
Da Chen ◽  
Guang Xing Ping ◽  
Chao Wang ◽  
Hai Zhen Chen ◽  
...  
Keyword(s):  
Solvothermal Method ◽  
Raw Materials ◽  
Chemical Oxidation ◽  
Graphene Nanocomposites ◽  
Photocatalytic Activities ◽  
Potential Applications ◽  
Tio2 Nanomaterials ◽  
One Step ◽  
20 Nm ◽  
Commercial Tio2

In this work, a novel photocatalyst with excellent photocatalytic activities was developed by the combination of TiO2 with graphene oxide (GO). GO was firstly prepared by the chemical oxidation of graphite through Hummers method and the subsequent dispersion and exfoliation in water. Then, GO and P25 nanoparticles (commercial TiO2) were used as raw materials to synthesize TiO2/graphene (TiO2/GE) nanocomposites by using a one-step solvothermal method. TEM images clearly showed that TiO2 nanomaterials (the size of about 15~20 nm) were distributed well onto the two-dimensional (2D) graphene sheets, indicating the formation of TiO2/GE nanocomposites. XRD results indicated that TiO2/GE nanocomposites exhibited TiO2 crystalline phase structure. Meanwhile, it was demonstrated from the methylene blue (MB) photodegradation results that TiO2/GE nanocomposites possessed excellent photocatalytic activities with potential applications.

scholarly journals One-step hydrothermal synthesis and optical properties of self-quenching-resistant carbon dots towards fluorescent ink and as nanosensors for Fe3+ detection

RSC Advances ◽  
2019 ◽  
Vol 9 (15) ◽  
pp. 8290-8299 ◽  
Author(s):  
Dandan Xu ◽  
Fang Lei ◽  
Haohong Chen ◽  
Luqiao Yin ◽  
Ying Shi ◽  
...  
Keyword(s):  
Optical Properties ◽  
Citric Acid ◽  
Hydrothermal Synthesis ◽  
Quantum Yield ◽  
Carbon Source ◽  
Nitrogen Source ◽  
Carbon Dots ◽  
Raw Materials ◽  
One Pot ◽  
One Step

Blue CDs with a quantum yield of 30.21% were successfully synthesized by a simple one-pot hydrothermal treatment using citric acid (carbon source) and polyvinyl pyrrolidone (nitrogen source) as the raw materials towards fluorescent ink and as nanosensors for Fe3+ detection.

Hydrogenolysis of glucose and fructose in glycol solutions over CuO-MgO-ZrO2 catalyst

2020 ◽  
pp. 48-55
Author(s):  
M.E. Sharanda ◽  
◽  
E.A. Bondarenko ◽  
Keyword(s):  
Ethylene Glycol ◽  
Propylene Glycol ◽  
Flow Reactor ◽  
General Trend ◽  
Raw Materials ◽  
Reaction Products ◽  
Renewable Raw Materials ◽  
High Partial Pressure ◽  
Zro2 Catalyst ◽  
Phase Process

Ethylene glycol and propylene glycol are important representatives of polyols. On an industrial scale, they are obtained from petrochemical raw materials. Within a decade, significant efforts were made for the producing of polyols from biologically renewable raw materials - carbohydrates. The general trend for carbohydrate hydrogenolysis includes application of liquid-phase process with the use of modified metal-oxide catalysts, at 120-120 ° C and pressure of 3MPa or above. So high pressure is used for the reason to increase hydrogen solubility, and also due to the high partial pressure of low boiling solvents. We supposed that usage of high boiling solvents could allow hydrogenolysis to be performed at the lower pressure. Ethylene glycol and propylene glycol are of particular interest as such kind of solvent since they are both the main products of glucose hydrogenolysis. In this work, the process of hydrogenolysis of glucose and fructose over Cu / MgO-ZrO2 catalyst have been studied at temperature range of 160-200 °C and a pressure of 0.1-0.3 MPa in a flow reactor. The solvents were simultaneously the target products of the reaction - ethylene glycol and / or propylene glycol. Gas chromatography and 13C NMR were used for the reaction products identification. It was found that the solubility of glucose in propylene glycol is 21 % by weight, and in ethylene glycol 62% by weight. It was pointed out that the process of hydrogenolysis can take place at a pressure close to atmospheric. Under these conditions, the conversion of hexoses reaches 96-100 %. The reaction products are preferably propylene glycol and ethylene glycol. The total selectivity for C3-2 polyols is 90-94 %, that is higher than in the hydrogenolysis of glucose in aqueous solution.

One-step solvothermal preparation of TiO2/C composites and their visible-light photocatalytic activities

2008 ◽  
Vol 254 (13) ◽  
pp. 3762-3766 ◽  
Author(s):  
Ming Li ◽  
Shifeng Zhou ◽  
Yuewei Zhang ◽  
Guangqin Chen ◽  
Zhanglian Hong
Keyword(s):  
Visible Light ◽  
Photocatalytic Activities ◽  
One Step ◽  
Solvothermal Preparation ◽  
Visible Light Photocatalytic

Production of novel carbon nanostructures by electrochemical reduction of polychlorinated organic rings under mild conditions for supercapacitors

2021 ◽  
Author(s):  
Züleyha Kudaş ◽  
Emir Çepni ◽  
Emre Gür ◽  
Duygu Ekinci
Keyword(s):  
Carbon Source ◽  
Electrochemical Reduction ◽  
Electrochemical Method ◽  
Carbon Nanostructures ◽  
Electrochemical Growth ◽  
Mild Conditions ◽  
One Step ◽  
The One ◽  
Carbon Based

Here, new carbon-based nanostructures were prepared by the one-step electrochemical method using hexagonal and pentagonal polychlorinated organic rings as carbon source. The electrochemical growth of carbon nanostructures on substrates was...

scholarly journals Open problems in traceability: from raw materials to finished food products

2013 ◽  
Vol 44 (2s) ◽  
Author(s):  
Lorenzo Comba ◽  
Fabrizio Dabbene ◽  
Paolo Gay ◽  
Cristina Tortia
Keyword(s):  
Supply Chain ◽  
Raw Materials ◽  
Product Recalls ◽  
Open Problems ◽  
Food Traceability ◽  
Clear Sign ◽  
One Step ◽  
Risk Notification ◽  
Production Period ◽  
The Impact

Even though the main EU regulations concerning food traceability have already entered to force since many years, we still remark very wide and impacting product recalls, which often involve simultaneously large territories and many countries. This is a clear sign that current traceability procedures and systems, when implemented with the only aim of respecting mandatory policies, are not effective, and that there are some aspects that are at present underestimated, and therefore should be attentively reconsidered. In particular, the sole adoption of the so-called “one step back-one step forward traceability” to comply the EC Regulation 178/2002, where every actor in the chain handles merely the data coming from his supplier and those sent to his client, is in fact not sufficient to control and to limit the impact of a recall action after a risk notification. Recent studies on lots dispersion and routing demonstrate that each stakeholder has to plan his activities (production, transformation or distribution) according to specific criteria that allow pre-emptively estimating and limiting the range action of a possible recall. Moreover, these new and very recently proposed techniques still present some limits; first of all the problem of traceability of bulk products (e.g. liquids, powders, grains, crystals) during production phases that involve mixing operations of several lots of different/same materials. In fact, current traceability practices are in most cases unable to deal efficiently with this kind of products, and, in order to compensate the lack of knowledge about lot composition, typically resort to the adoption of very large lots, based for instance on a considered production period. Aim of this paper is to present recent advances in the design of supply chain traceability systems, discussing problems that are still open and are nowadays subject of research.

One-step exfoliation and fluorination of g-C3N4 nanosheets with enhanced photocatalytic activities

2017 ◽  
Vol 41 (8) ◽  
pp. 3061-3067 ◽  
Author(s):  
Fukun Ma ◽  
Changlong Sun ◽  
Yongliang Shao ◽  
Yongzhong Wu ◽  
Baibiao Huang ◽  
...  
Keyword(s):  
Photocatalytic Activities ◽  
One Step

A one-step route for the exfoliation and fluorination of g-C3N4 nanosheets is presented and the F-C3N4 nanosheets show enhanced photocatalytic activities.

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