scholarly journals One-Pot Polymerization of Dopamine as an Additive to Enhance Permeability and Antifouling Properties of Polyethersulfone Membrane

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1807
Author(s):  
Sri Mulyati ◽  
Syawaliah Muchtar ◽  
Nasrul Arahman ◽  
Friska Meirisa ◽  
Yanna Syamsuddin ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Membrane Surface ◽  
Single Step ◽  
One Pot ◽  
Membrane Fabrication ◽  
Polyethersulfone Membrane ◽  
Dope Solution ◽  
Pore Properties ◽  
Filtration Flux

This paper reports the fabrication of polyethersulfone membranes via in situ hydrogen peroxide-assisted polymerization of dopamine. The dopamine and hydrogen peroxide were introduced into the dope solution where the polymerization occurred, resulting in a single-step additive formation during membrane fabrication. The effectivity of modification was evaluated through characterizations of the resulting membranes in terms of chemical functional groups, surface morphology, porosity, contact angle, mechanical strength and filtration of humic acid solution. The results confirm that the polydopamine was formed during the dope solution mixing through peroxide-assisted polymerization as proven by the appearance of peaks associated OH and NH groups in the resulting membranes. The presence of polydopamine residual in the membrane matric enhances the pore properties in terms of size and porosity (by a factor of 10), and by lowering the hydrophilicity (from 69° to 53°) which leads to enhanced filtration flux of up to 217 L/m2 h. The presence of the residual polydopamine also enhances membrane surface hydrophilicity which improve the antifouling properties as shown from the flux recovery ratio of > 80%.

Direct growth of layered intercalation compounds via single step one-pot in situ synthesis

2015 ◽  
Vol 51 (57) ◽  
pp. 11398-11400 ◽  
Author(s):  
Jingfang Yu ◽  
Lichen Xiang ◽  
Benjamin R. Martin ◽  
Abraham Clearfield ◽  
Luyi Sun
Keyword(s):  
Synthesis Method ◽  
Layered Materials ◽  
Single Step ◽  
In Situ Synthesis ◽  
Intercalation Compounds ◽  
One Pot ◽  
Wide Range ◽  
Direct Growth

A single step one-pot in situ synthesis method was developed to directly grow layered intercalation compounds. This methodology is expected to be applicable to a wide range of layered materials.

One-Pot Catalytic Epoxidation Reaction of Perfluoro-2-methyl-2-pentene with Tri-n-butylamine N-Oxide or N, N-Dimethylcyclohexylamine N-Oxide

2013 ◽  
Vol 685 ◽  
pp. 357-361 ◽  
Author(s):  
Min Sha ◽  
Ren Ming Pan ◽  
Biao Jiang
Keyword(s):  
Organic Chemistry ◽  
Hydrogen Peroxide ◽  
Low Cost ◽  
Reaction Conditions ◽  
One Pot ◽  
Catalytic Epoxidation ◽  
Epoxidation Reaction ◽  
Work Up ◽  
Better Than

Perfluoro epoxy compounds are important intermediates in organic chemistry, however, the methods for preparing them are scanty. We found that in situ generated tri-n-butylamine N-oxide and N,N-Dimethylcyclohexylamine N-oxide were found to be good reagents for the epoxidation of tri-substituted Perfluoro-2-methyl-2-pentene in good to excellent yields. Catalytic epoxidation methods were developed by coupling this reaction with the N-oxidation of tertiary amine by hydrogen peroxide or MCPBA. The advantages of these methods are easy work-up, mild reaction conditions, environmentally friendly and low cost. The reaction using MCPBA as a oxidant is better than hydrogen peroxide for it is fast and high yielding.

scholarly journals Aluminacyclopentanes in the synthesis of 3-substituted phospholanes and α,ω-bisphospholanes

2016 ◽  
Vol 12 ◽  
pp. 406-412 ◽  
Author(s):  
Vladimir A D’yakonov ◽  
Alevtina L Makhamatkhanova ◽  
Rina A Agliullina ◽  
Leisan K Dilmukhametova ◽  
Tat’yana V Tyumkina ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Molybdenum Hexacarbonyl ◽  
Peroxide Oxidation ◽  
One Pot ◽  
Alkyl Aryl ◽  
Hydrogen Peroxide Oxidation

An efficient one-pot process for the synthesis of 3-substituted phospholanes and α,ω-bisphospholanes was developed. The method involves the replacement of aluminium in aluminacyclopentanes, prepared in situ by catalytic cycloalumination of α-olefins and α,ω-diolefins, by phosphorus atoms on treatment with dichlorophosphines (R′PCl2). Hydrogen peroxide oxidation and treatment with S8 of the synthesized phospholanes and α,ω-bisphospholanes afforded the corresponding 3-alkyl(aryl)-1-alkyl(phenyl)phospholane 1-oxides, 3-alkyl(aryl)-1-alkyl(phenyl)phospholane 1-sulfides, bisphospholane 1,1'-dioxides, and bisphospholane 1,1'-disulfides in nearly quantitative yields. The complexes LMo(CO)5 (L = 3-hexyl-1-phenylphospholane, 3-benzyl-1-methylphospholane, 1,2-bis(1-phenylphospholan-3-yl)ethane, and 1,6-bis(1-phenylphospholan-3-yl)hexane were prepared by the reaction of 3-substituted phospholanes and α,ω-bisphospholanes with molybdenum hexacarbonyl. The structure of the complexes was proved by multinuclear 1H, 13C, and 31P spectroscopy.

scholarly journals Expanding structural diversity in a library of disulfide macrocycles through in-situ imide hydrolysis

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Marcin Konopka ◽  
Artur R. Stefankiewicz
Keyword(s):  
Phase Transfer ◽  
Structural Diversity ◽  
Single Step ◽  
Water Soluble ◽  
One Pot ◽  
Dynamic Covalent Chemistry ◽  
Complex Process ◽  
Dmso Concentration ◽  
Hydrolysis Of

AbstractWe describe here an unorthodox approach to dynamic covalent chemistry in which the initially-unexpected in-situ hydrolysis of a bis-imide is employed to control the composition of a library of structurally diverse macrocycles. A single building block is used to generate a library of numerous disulfide-based architectures in a one-pot single-step process. The dual-stimuli method is based on simultaneous changes in pH and DMSO concentration to expand the structural diversity of the macrocyclic products. Mechanistic details of this complex process are investigated by the kinetics analysis. We delivered a facile strategy for the synthesis of water-soluble, multicomponent and dynamic macrocycles equipped with number of different functional groups, thus giving a prospect of their application in guest-driven phase transfer.

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