scholarly journals Preparation of Bi-based heterostructures through the one-pot method with the potential to photocatalytic applications

2020 ◽  
Vol 4 (01) ◽  
pp. 39-51
Author(s):  
Eduardo Henrique Dias ◽  
Gelson Tiago Dos Santos Tavares da Silv ◽  
Osmando Ferreira Lopes ◽  
Caue Ribeiro
Keyword(s):  
Uv Radiation ◽  
Photocatalytic Performance ◽  
Synthesis Method ◽  
Chemical Properties ◽  
Temperature Treatment ◽  
Visible Radiation ◽  
One Pot ◽  
Electron Hole Pair ◽  
Pure Phases ◽  
The One

This paper describes a facile one-pot method to obtain Bi-based heterostructures by calcination process and evaluate the physical-chemical properties. The increase in the temperature treatment changed the sample’s phase crystalline, the synthesis method proposed was able to obtain (BiO)2CO3, α-Bi2O3, and β-Bi2O3 pure phases and (BiO)2CO3/α-Bi2O3 and α-Bi2O3/β-Bi2O3 heterostructures. Additionally, the annealing temperature also influences the morphology, optical, and photocatalytic properties. The temperature increases decreased the sample’s bandgap, and the above 350ºC, the samples became active under visible radiation. The photocatalytic performance of the samples was evaluated under UV and visible radiation on the MB degradation, it was observed that under UV radiation, the (BiO)2CO3 phase exhibited higher performance than the Bi2O3 phase. Therefore, we can confirm that the increases in the temperature harmed the photocatalytic performance under UV radiation. On the other hand, synthesized samples above 300°C showed the best performance under visible radiation, due to the bandgap reduction and the electron/hole pair lifetime increasing.

Facile synthesis of CuCr2O4 spinel nanoparticles: a recyclable heterogeneous catalyst for the one pot hydroxylation of benzene

2014 ◽  
Vol 4 (12) ◽  
pp. 4232-4241 ◽  
Author(s):  
Shankha S. Acharyya ◽  
Shilpi Ghosh ◽  
Shubhadeep Adak ◽  
Takehiko Sasaki ◽  
Rajaram Bal
Keyword(s):  
Hydrothermal Synthesis ◽  
Synthesis Method ◽  
Facile Synthesis ◽  
One Pot ◽  
Nanoparticle Catalysts ◽  
Hydroxylation Of Benzene ◽  
The One ◽  
Recyclable Heterogeneous Catalyst ◽  
Selective Hydroxylation ◽  
Spinel Nanoparticles

A facile hydrothermal synthesis method is developed to prepare CuCr2O4 spinel nanoparticle catalysts with sizes between 25–50 nm for selective hydroxylation of benzene.

scholarly journals Stepwise PEG synthesis featuring deprotection and coupling in one pot

2021 ◽  
Vol 17 ◽  
pp. 2976-2982
Author(s):  
Logan Mikesell ◽  
Dhananjani N A M Eriyagama ◽  
Yipeng Yin ◽  
Bao-Yuan Lu ◽  
Shiyue Fang
Keyword(s):  
Synthesis Method ◽  
Polyethylene Glycols ◽  
Protecting Group ◽  
One Pot ◽  
Isolation And Purification ◽  
Stepwise Synthesis ◽  
Convenient Approach ◽  
Formation Conditions ◽  
The One ◽  
Acid Labile

The stepwise synthesis of monodisperse polyethylene glycols (PEGs) and their derivatives usually involves using an acid-labile protecting group such as DMTr and coupling the two PEG moieties together under basic Williamson ether formation conditions. Using this approach, each elongation of PEG is achieved in three steps – deprotection, deprotonation and coupling – in two pots. Here, we report a more convenient approach for PEG synthesis featuring the use of a base-labile protecting group such as the phenethyl group. Using this approach, each elongation of PEG can be achieved in two steps – deprotection and coupling – in only one pot. The deprotonation step, and the isolation and purification of the intermediate product after deprotection using existing approaches are no longer needed when the one-pot approach is used. Because the stepwise PEG synthesis usually requires multiple PEG elongation cycles, the new PEG synthesis method is expected to significantly lower PEG synthesis cost.

One-pot sol-gel synthesis of sulfated ZrO2-SiO2 catalysts for alcohol dehydration

2001 ◽  
Vol 79 (8) ◽  
pp. 1220-1223 ◽  
Author(s):  
Quan Zhuang ◽  
Jack M Miller
Keyword(s):  
Ammonium Sulfate ◽  
Sulfated Zirconia ◽  
Sol Gel ◽  
Synthesis Method ◽  
Acid Catalyst ◽  
Alcohol Dehydration ◽  
One Pot ◽  
Zirconium Propoxide ◽  
The One ◽  
Sol Gel Synthesis

Sulfated ZrO2–SiO2 catalysts were synthesized by one-pot sol-gel method using ammonium sulfate, zirconium propoxide, and tetraethyl orthosilicate as precursors. The catalysts were characterized by N2 adsorption and DRIFTS. On calcining the gel at elevated temperature, the ammonium sulfate decomposed, giving a sulfated zirconia–silica catalyst. By adding ammonium sulfate to the sol-gel synthesis system, the surface area, pore size, and pore volume of the resultant catalyst were increased. The one-pot sol-gel synthesized catalyst with an optimum loading of SO42– 14 mol% showed significantly higher catalytic activity, with a selectivity of 100%, for isopropanol dehydration when compared to the impregnated catalyst. The one-pot sol-gel synthesis method is an effective way to prepare sulfated zirconia catalyst.Key words: sulfated zirconia, sol-gel synthesis, acid catalyst, alcohol dehydration, N2 adsorption, DRIFT.

A self-assembled octanuclear complex bearing the uncommon close-packed {Fe4Mn4(μ4-O)4(μ-O)4} molecular core

2015 ◽  
Vol 44 (33) ◽  
pp. 14918-14924 ◽  
Author(s):  
Oksana V. Nesterova ◽  
Eduard N. Chygorin ◽  
Vladimir N. Kokozay ◽  
Irina V. Omelchenko ◽  
Oleg V. Shishkin ◽  
...  
Keyword(s):  
Schiff Base ◽  
Direct Synthesis ◽  
Synthesis Method ◽  
Schiff Base Complex ◽  
Metal Core ◽  
One Pot ◽  
Base Complex ◽  
Molecular Core ◽  
The One ◽  
Heterometallic Compound

An Fe/Mn Schiff base complex with an unprecedented metal core type for a heterometallic compound, has been prepared by the one-pot direct synthesis method and magnetostructurally characterized.

scholarly journals One-Pot Synthesis and High Electrochemical Performance of CuS/Cu1.8S Nanocomposites as Anodes for Lithium-Ion Batteries

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3797 ◽  
Author(s):  
Lin-Hui Wang ◽  
Yan-Kun Dai ◽  
Yu-Feng Qin ◽  
Jun Chen ◽  
En-Long Zhou ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
High Current Density ◽  
Synthesis Method ◽  
Rate Capability ◽  
Lithium Ion ◽  
Discharge Voltage ◽  
One Pot ◽  
One Pot Synthesis ◽  
The One

CuS and Cu1.8S have been investigated respectively as anodes of lithium-ion batteries because of their abundant resources, no environment pollution, good electrical conductivity, and a stable discharge voltage plateau. In this work, CuS/Cu1.8S nanocomposites were firstly prepared simultaneously by the one-pot synthesis method at a relatively higher reaction temperature 200 °C. The CuS/Cu1.8S nanocomposites anodes exhibited a high initial discharge capacity, an excellent reversible rate capability, and remarkable cycle stability at a high current density, which could be due to the nano-size of the CuS/Cu1.8S nanocomposites and the assistance of Cu1.8S. The high electrochemical performance of the CuS/Cu1.8S nanocomposites indicated that the CuxS nanomaterials will be a potential lithium-ion battery anode.

scholarly journals Synthesis and Properties of Partially Hydrogenated Ethyl ([3,4']Bipyridin-6'-ylsulfanyl) Acetates

2010 ◽  
Vol 49 (1-4) ◽  
pp. 66-71
Author(s):  
A. Krauze ◽  
Z. Andžāns ◽  
G. Duburs
Keyword(s):  
Acetic Acid ◽  
Synthesis Method ◽  
Subsequent Treatment ◽  
Ethyl Bromoacetate ◽  
One Pot ◽  
Cardiovascular Agents ◽  
One Pot Synthesis ◽  
The One

Synthesis and Properties of Partially Hydrogenated Ethyl ([3,4']Bipyridin-6'-ylsulfanyl) Acetates Ethyl 2'-hydroxy-1',2',3',4'-tetrahydro[3,4']bipyridine-3'-carboxylate 3 and the corresponding ethyl 1',4'-dihydro[3,4']bipyridine-3'-carboxylate 4 as potential cardiovascular agents have been prepared by alkylation of 2'-hydroxy-1',2',3',4'-tetrahydro[3,4']bipyridine-6'-thiolate 1 or betaine 2 with ethyl bromoacetate. The treatment of [3,4']bipyridine 4 with KOH/H2O gave diethyl 3-amino-4-(pyridin-3-yl)-4,7-dihydrothieno[2,3-b]-pyridine-2,5-dicarboxylate 5, but subsequent treatment of the remaining reaction mixture with acetic acid excess gave ethyl 3-oxo-7-(pyridin-3-yl)-2,3-dihydro-7H-thiazolo[3,2-a]pyridine-6-carboxylate 7 - the product of intramolecular acylation. Compounds 4, 5 and 7 have been prepared using the one-pot synthesis method. Alkylation of [3,4']bipyridine 4 with iodomethane gave 1',4'-dihydro[3,4'] bipyridin-1-ium iodide 8.

scholarly journals PREPARATION SOME ACID-ACTIVATED MONTMORILLONITES FROM CU CHI CLAY AND USING AS CATALYST IN ONE-POT CONVERSION OF BENZALDEHYDE INTO BENZONITRILE

2011 ◽  
Vol 14 (4) ◽  
pp. 43-53
Author(s):  
Dung Duc Pham ◽  
Dat Thanh Vu ◽  
Thach Ngoc Le
Keyword(s):  
Chemical Composition ◽  
Cation Exchange Capacity ◽  
Chemical Properties ◽  
Exchange Capacity ◽  
Solid Catalyst ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Physical Chemical ◽  
The One

Montmorillonite is a "green" solid catalyst and support used in many organic reactions. In this paper, we have prepared some acid-activated montmorillonites from Cu Chi clay. Then, we determinated physical-chemical properties such as specific surface area, cation exchange capacity, X-ray diffraction, chemical composition and acidity of these samples. Finally, we chose the best from these montmorillonites and used as catalyst in the one-pot conversion of benzaldehyde into benzonitrile under solvent-free and microwave irradiation.

scholarly journals Direct Alcoholysis of Carbohydrate Precursors and Real Cellulosic Biomasses to Alkyl Levulinates: A Critical Review

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1221
Author(s):  
Anna Maria Raspolli Galletti ◽  
Claudia Antonetti ◽  
Sara Fulignati ◽  
Domenico Licursi
Keyword(s):  
Levulinic Acid ◽  
Raw Materials ◽  
Low Cost ◽  
Chemical Properties ◽  
One Pot ◽  
Speed Up ◽  
Acid Catalyzed ◽  
The One ◽  
Alkyl Levulinates ◽  
New Applications

Alkyl levulinates (ALs) represent outstanding bio-fuels and strategic bio-products within the context of the marketing of levulinic acid derivatives. However, their synthesis by acid-catalyzed esterification of pure levulinic acid, or by acid-catalyzed alcoholysis of furfuryl alcohol, although relatively simple, is still economically disadvantageous, due to the high costs of the pure precursors. The direct one-pot alcoholysis of model C6 carbohydrates and raw biomass represents an alternative approach for the one-step synthesis of ALs. In order to promote the market for these bio-products and, concurrently, the immediate development of new applications, it is necessary to speed up the intensification of their production processes, and this important achievement is onlypossible by using low-cost or, even better, waste biomasses, as starting feedstocks. This review provides an overview of the most recent and promising advances on the one-pot production of ALs from model C6 carbohydrates and real biomasses, in the presence of homogeneous or heterogeneous acid catalysts. The use of model C6 carbohydrates allows for the identification of the best obtainable ALs yields, resulting in being strategic for the development of new smart catalysts, whose chemical properties must be properly tuned, taking into account the involved reaction mechanism. On the other hand, the transition to the real biomass now represents a necessary choice for allowing the next ALs production on a larger scale. The improvement of the available synthetic strategies, the use of raw materials and the development of new applications for ALs will contribute to develop more intensified, greener, and sustainable processes.

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