Novel R3M (M = Si, Ge) substituted furan and thiophene-derived aldimines: Synthesis, electrochemistry, and biological activity
Publication date: Available online 6 November 2019Source: Comptes Rendus ChimieAuthor(s): Jana Spura, Amel Farhati, Vitalijs Romanovs, Artyom Borodulin, Sergejs Belakovs, Juris Popelis, Irina Shestakova, Mohamed Dammak, Viatcheslav JouikovAbstractNew furan and thiophene derivatives of aldimines o-HO-C6H4NCHC4H4X(R) (X = O, S; R = H, SiMe3, SiEt3, GeMe3, GeEt3) were synthesized by condensation of o-aminophenol with the substituted aldehyde precursor. Their structure, electrochemical reduction/oxidation (in CH3CN/0.1 M Bu4NPF6), frontier orbital energies, and cytotoxicity have been studied. Their electrochemical redox poten...
Source: Comptes Rendus Chimie - November 7, 2019 Category: Chemistry Source Type: research
Decoration of copper foam with Ni nanorods and copper oxide nanosheets to produce a high-stability electrocatalyst for the reduction of CO2: Characterization of the electrosynthesis of isonicotinic acid
Publication date: Available online 4 November 2019Source: Comptes Rendus ChimieAuthor(s): Safoora Mohammadzadeh, Hamid R. Zare, Hossein KhoshroAbstractCuO–Cu2O (CuxO) nanosheets were coated on a copper foam substrate by the electrochemical anodization method in an alkaline solution. Constant current coulometry was performed to electrodeposit Ni nanorods on the surface of a Cu/CuxO electrode. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) proved that the copper oxide nanosheets were anchored on the copper foam substrate and modified by Ni nanorods (Cu/CuxO/Ni). The process took place via a facile and inexp...
Source: Comptes Rendus Chimie - November 5, 2019 Category: Chemistry Source Type: research
The influence of coating-carbonization cycles toward P84 co-polyimide/nanocrystalline cellulose
This study introduces effective dip-coating methods for high-performance tubular carbon membrane production. On the basis of the outcome of this study, the coating-carbonization cycle (one, two, three, or four times) has been recognized as a major influence on the separation efficiency. Gas separation performance, selectivity, permeability, and the transport mechanism of the carbon membranes were adequately evaluated by pure O2 and N2. The PI/NCC scanning electron microscopy images show that all of the carbon membrane samples are composed of a dense structure, whereas the Fourier transform infrared spectroscopy analysis ex...
Source: Comptes Rendus Chimie - October 22, 2019 Category: Chemistry Source Type: research
Response surface methodology-optimized removal of chloramphenicol pharmaceutical from wastewater using Cu3(BTC)2-derived porous carbon as an efficient adsorbent
Publication date: Available online 14 October 2019Source: Comptes Rendus ChimieAuthor(s): Thuan Van Tran, Duyen Thi Cam Nguyen, Hanh Thi Ngoc Le, Huu Loc Ho, Trung Thanh Nguyen, Van-Dat Doan, Trinh Duy Nguyen, Long Giang BachAbstractThe prevalent presence of antibiotic compounds (e.g., chloramphenicol [CAP]) in wastewater and effluents without pretreatment can bring adverse impacts on human and animals; therefore, the remediation of these substrates is emergently essential. To synthesize the novel mesoporous carbon for chloramphenicol remediation, we pyrolyzed a species of copper-based metal-organic framework, namely Cu3(B...
Source: Comptes Rendus Chimie - October 15, 2019 Category: Chemistry Source Type: research
Extraction and complexation of lanthanide ions by dihomooxacalix[4]arene and calix[4]arene tetraketone derivatives: An experimental and molecular dynamics investigation
Publication date: Available online 11 October 2019Source: Comptes Rendus ChimieAuthor(s): Joel D. Fonseca, Paula M. Marcos, José R. Ascenso, Sylvia Michel, Véronique Hubscher-Bruder, Rachel SchurhammerAbstractLanthanide cation binding by tetraketone derivatives of p-tert-butyldihomooxacalix[4]arene (methyl 1a, tert-butyl 1b, adamantyl 1c and phenyl 1d) and of p-tert-butylcalix[4]arene (methyl 2a, adamantyl 2c and phenyl 2d), in the cone conformation, was investigated. These properties were assessed by extraction experiments of the metal picrates from water to dichloromethane and by stability constant measurements in acet...
Source: Comptes Rendus Chimie - October 12, 2019 Category: Chemistry Source Type: research
Evaluation of the intermolecular interactions and polymorphism of mefenamic acid crystals in N,N-dimethyl formamide solution: A molecular dynamics simulation and experimental study
This study investigates the polymorphism of mefenamic acid in N,N-dimethyl formamide (DMF) through the combination of molecular dynamic simulations and experimental study. The molecular dynamic simulations were performed using the Material Studio 5.5 simulation package with a Condensed-phase Optimized Molecular Potentials for Atomistic Simulation Studies (COMPASS) force field. The simulation trajectory files were analyzed for radial distribution functions to investigate the intermolecular interactions. The experimental study was performed by the cooling crystallization method with DMF as the solvent. The saturated solution...
Source: Comptes Rendus Chimie - October 11, 2019 Category: Chemistry Source Type: research
Amino-functionalized MIL-88B(Fe)-based porous carbon for enhanced adsorption toward ciprofloxacin pharmaceutical from aquatic solutions
Publication date: Available online 7 October 2019Source: Comptes Rendus ChimieAuthor(s): Thuan Van Tran, Duyen Thi Cam Nguyen, Hanh Thi Ngoc Le, Dai-Viet N. Vo, Van-Dat Doan, Van-Phuc Dinh, Hong-Tham Thi Nguyen, Trinh Duy Nguyen, Long Giang BachAbstractThe present study focused on the synthesis of novel NH2-PC700 adsorbent through the pyrolysis of NH2-MIL-88B (Fe) material under different pyrolysis temperatures (500, 700, and 900 °C) and investigated its application for ciprofloxacin adsorption. The obtained adsorbents were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and nitrogen ...
Source: Comptes Rendus Chimie - October 10, 2019 Category: Chemistry Source Type: research
Electrogenerated iron supported on mesoporous titania nanoparticles for the photocatalytic degradation of 2-chlorophenol
Publication date: Available online 5 October 2019Source: Comptes Rendus ChimieAuthor(s): Nor Amira Marfur, Nur Farhana Jaafar, N.H.H.M. HabibullahAbstractIn this research, various weight loadings of Fe (3%, 5%, 7%, and 10%) supported on mesoporous titania nanoparticles (MTNs) were prepared using in-situ electrolysis before being characterised using X-ray diffraction, Fourier transform infrared, surface area analysis, UV–vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The performance of the Fe–MTN catalysts was investigated under visible light illumination based on the photocatalytic degradat...
Source: Comptes Rendus Chimie - October 6, 2019 Category: Chemistry Source Type: research
New functionalized scaffolds from hydroxymethylfurfural and glucosyloxymethylfurfural by Morita–Baylis–Hillman reaction with cycloalkenones
Publication date: Available online 5 October 2019Source: Comptes Rendus ChimieAuthor(s): Lianjie Wang, Jia-Neng Tan, Mohammed Ahmar, Yves QueneauAbstractNew highly functionalized scaffolds, namely 2-(2-furyl)hydroxymethyl-2-cycloalkenones, are reported. The access to these systems is one step using an aqueous Morita–Baylis–Hillman reaction combining hydroxymethylfurfural and glucosyloxymethylfurfural and cycloalkenones for which the reaction conditions (promoter, solvent, concentration, and stoichiometry) have been optimized.RésuméDe nouvelles architectures fonctionnalisées de type 2-(2-furyl)hydroxyméthyl-2-cycloa...
Source: Comptes Rendus Chimie - October 6, 2019 Category: Chemistry Source Type: research
The synthesis of sulphonated hypercrosslinked exchange resin for free fatty acid esterification
This study investigates the potential of sulphonated hypercrosslinked exchange resin (SHER), a newly synthesised catalyst for the esterification reaction. The experimental works were divided into two stages: (1) the synthesis and characterisation of the catalyst and (2) screening study on the esterification of FFAs in used cooking oil (UCO) using different types of ion-exchange resins. SHER was found to have excellent characteristics with high specific surface area (∼836 m2 g−1) and thermal decomposition temperature (398 °C). The SHER was then subjected to the esterification reaction and outperformed other catalyst...
Source: Comptes Rendus Chimie - October 4, 2019 Category: Chemistry Source Type: research
Investigation of iridium composition in Ti1–xIrxO2 (x = 0.1, 0.2, 0.3) nanostructures as potential supports for platinum in methanol electro-oxidation
Publication date: Available online 1 October 2019Source: Comptes Rendus ChimieAuthor(s): Vi Thuy Thi Phan, Tai Thien Huynh, Hau Quoc Pham, Anh Tram Ngoc Mai, Thy Ho Thi Anh, Thi Hong Tham Nguyen, Thang Manh Ngo, Van Thi Thanh HoAbstractTo overcome the disadvantages of commercial carbonaceous catalysts in direct methanol fuel cells (DMFCs), novel Pt/Ti1–xIrxO2 catalysts are fabricated in this study. Simultaneously, the influence of the Ir composition in the support on the electrocatalytic activities and physicochemical properties of Pt/Ti1–xIrxO2 catalysts is also evaluated. Ti1–xIrxO2 materials with the tunable Ir co...
Source: Comptes Rendus Chimie - October 2, 2019 Category: Chemistry Source Type: research
Highly stable Pt/ITO catalyst as a promising electrocatalyst for direct methanol fuel cells
Publication date: Available online 20 September 2019Source: Comptes Rendus ChimieAuthor(s): Van Thi Thanh Ho, Hau Quoc Pham, Thy Ho Thi Anh, At Van Nguyen, Khuong Anh Nguyen Quoc, Hau Thi Hien Vo, Thi Thuong NguyenAbstractDirect methanol fuel cells (DMFCs) have attracted considerable scientific interest because of their ease of operation and implementation; however, poor electrocatalytic activity and durability are the main hindrances for their commercial feasibility. Moreover, the deactivation of active Pt sites, due to the coverage of CO-like species during the electrochemical oxidation reaction, significantly degrades t...
Source: Comptes Rendus Chimie - September 21, 2019 Category: Chemistry Source Type: research
Fabrication and characterisation of a polyamide thin-film composite membrane on a nylon 6,6 substrate for isopropanol dehydration
Publication date: Available online 19 September 2019Source: Comptes Rendus ChimieAuthor(s): Wan Zulaisa Amira Wan Jusoh, Sunarti Abdul Rahman, Abdul Latif Ahmad, Nadzirah Mohd MokhtarAbstractThin-film composite (TFC) is feasible for use in isopropanol (IPA) dehydration by pervaporation (PV) for its superior performance and strength. The hydrophobic substrate membrane allows the penetration of the diamine monomer into the pores, which leads to flux reduction. Furthermore, hydrophobic polymer is difficult for TFC deposition because of its strong and opposing characteristics. To solve this problem, hydrophilic nylon 6,6 (N66)...
Source: Comptes Rendus Chimie - September 19, 2019 Category: Chemistry Source Type: research
Optimization of saponins, phenolics, and antioxidants extracted from fenugreek seeds using microwave-assisted extraction and response surface methodology as an optimizing tool
Publication date: Available online 6 September 2019Source: Comptes Rendus ChimieAuthor(s): Sweeta Akbari, Nour Hamid Abdurahman, Rosli Mohd YunusAbstractFenugreek is a multiregional plant mostly found in Asia, the Middle East, and some European countries. Thus, this study aimed to optimize the microwave-assisted extraction (MAE) process parameters such as irradiation time (2–4 min), ethanol concentration (40–80%), microwave power (500–700 W), solid-to-liquid ratio (1:8–1:12 g/mL), and a fixed extraction temperature (70 °C) for fenugreek seed powder. Response surface methodology (RSM) was applied to optimize MA...
Source: Comptes Rendus Chimie - September 7, 2019 Category: Chemistry Source Type: research
Editorial Board - English
Publication date: August 2019Source: Comptes Rendus Chimie, Volume 22, Issue 8Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - September 5, 2019 Category: Chemistry Source Type: research
