Hemin-catalyzed biomimetic oxidative phenol–indole [3 + 2] reactions in aqueous media

2019 ◽  
Vol 17 (47) ◽  
pp. 9994-9998 ◽  
Author(s):  
Yu Fu ◽  
Qile Yu ◽  
Yulong Zhang ◽  
Zhonghong Gao ◽  
Yuzhou Wu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic System ◽  
Aqueous Media ◽  
Benign Synthesis

A hemin/H2O2 catalytic system for oxidative phenol–indole [3 + 2] coupling in aqueous solution has been developed, enabling benign synthesis of valuable benzofuroindolines under sustainable conditions.

Highly efficient and selective photocatalytic CO2 to CO conversion in aqueous solution

2020 ◽  
Vol 56 (27) ◽  
pp. 3851-3854 ◽  
Author(s):  
Xiaomin Chai ◽  
Hai-Hua Huang ◽  
Huiping Liu ◽  
Zhuofeng Ke ◽  
Wen-Wen Yong ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Performance ◽  
Aqueous Media ◽  
Highly Efficient ◽  
Co Conversion

A Co-based complex displayed the highest photocatalytic performance for CO2 to CO conversion in aqueous media.

An iron–nitrogen doped carbon and CdS hybrid catalytic system for efficient CO2 photochemical reduction

2021 ◽  
Vol 57 (16) ◽  
pp. 2033-2036
Author(s):  
Jin-Han Guo ◽  
Xiao-Yao Dao ◽  
Wei-Yin Sun
Keyword(s):  
Aqueous Solution ◽  
Catalytic System ◽  
Hybrid System ◽  
Photochemical Reduction ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

A new iron–nitrogen doped carbon and CdS hybrid system was developed to efficiently reduce CO2 to CO under UV/vis light (AM 1.5G) irradiation in aqueous solution.

scholarly journals Double-Cross-Linked Networks Based on Methacryloyl Mucin

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1706
Author(s):  
Elena Olăreț ◽  
Brîndușa Bălănucă ◽  
Andra Mihaela Onaș ◽  
Jana Ghițman ◽  
Horia Iovu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aqueous Solution ◽  
Chemical Modification ◽  
Structural Modification ◽  
Aqueous Media ◽  
Cross Linking ◽  
Ph Values ◽  
Acid Aqueous Solution ◽  
Reaction Media ◽  
Double Cross

Mucin is a glycoprotein with proven potential in the biomaterials field, but its use is still underexploited for such applications. The present work aims to produce a synthesis of methacryloyl mucin single-network (SN) hydrogels and their double-cross-linked-network (DCN) counterparts. Following the synthesis of the mucin methacryloyl derivative, various SN hydrogels are prepared through the photopolymerization of methacrylate bonds, using reaction media with different pH values. The SN hydrogels are converted into DCN systems via supplementary cross-linking in tannic acid aqueous solution. The chemical modification of mucin is described, and the obtained product is characterized; the structural modification of mucin is assessed through FTIR spectroscopy, and the circular dichroism and the isoelectric point of methacryloyl mucin is evaluated. The affinity for aqueous media of both SN and DCN hydrogels is estimated, and the mechanical properties of the systems are assessed, both at macroscale through uniaxial compression and rheology tests and also at microscale through nanoindentation tests.

scholarly journals Bis-NHC–Ag/Pd(OAc)2 Catalytic System Catalyzed Transfer Hydrogenation Reaction

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 8
Author(s):  
Hui-Ju Chen ◽  
Chien-Cheng Chiu ◽  
Tsui Wang ◽  
Dong-Sheng Lee ◽  
Ta-Jung Lu
Keyword(s):  
Functional Groups ◽  
Catalytic System ◽  
High Efficiency ◽  
Aqueous Media ◽  
Hydrogenation Reaction ◽  
Transfer Hydrogenation ◽  
Terminal Alkynes ◽  
Wide Range ◽  
Transfer Hydrogenation Reaction

The bis-NHC–Ag/Pd(OAc)2 catalytic system (NHC = N-heterocyclic carbene), a combination of bis-NHC–Ag complex and Pd(OAc)2, was found to be a smart catalyst in the Pd-catalyzed transfer hydrogenation of various functionalized arenes and internal/terminal alkynes. The catalytic system demonstrated high efficiency for the reduction of a wide range of various functional groups such as carbonyls, alkynes, olefins, and nitro groups in good to excellent yields and high chemoselectivity for the reduction of functional groups. In addition, the protocol was successfully exploited to stereoselectivity for the transformation of alkynes to alkenes in aqueous media under air. This methodology successfully provided an alternative useful protocol for reducing various functional groups and a simple operational protocol for transfer hydrogenation.

New metal-free catalytic degradation systems with carbon dots for thymol blue

2017 ◽  
Vol 41 (22) ◽  
pp. 13365-13369 ◽  
Author(s):  
Cui Zheng ◽  
Xueqin An ◽  
Tianxiang Yin
Keyword(s):  
Catalytic System ◽  
Carbon Dots ◽  
Aqueous Media ◽  
Catalytic Degradation ◽  
Thymol Blue ◽  
Metal Free

A metal-free catalytic system with carbon dots as a catalyst for thymol blue degradation in slightly alkaline aqueous media.

scholarly journals The Equilibrium, Kinetics, and Thermodynamics Studies of the Sorption of Methylene Blue from Aqueous Solution Using Pulverized Raw Macadamia Nut Shells

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Joshua N. Edokpayi ◽  
Samson O. Alayande ◽  
Ahmed Adetoro ◽  
John O. Odiyo
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Surface Area ◽  
Low Cost ◽  
Aqueous Media ◽  
Group Analysis ◽  
Second Order ◽  
Isotherm Models ◽  
Macadamia Nut ◽  
Pseudo Second Order

In this study, the potential for pulverized raw macadamia nut shell (MNS) for the sequestration of methylene blue from aqueous media was assessed. The sorbent was characterized using scanning electron microscopy for surface morphology, functional group analysis was performed with a Fourier-transform infrared spectrometer (FT-IR), and Brunauer–Emmett–Teller (BET) isotherm was used for surface area elucidation. The effects of contact time, sorbent dosage, particle size, pH, and change in a solution matrix were studied. Equilibrium data were fitted using Temkin, Langmuir, and Freundlich adsorption isotherm models. The sorption kinetics was studied using the Lagergren pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models. The feasibility of the study was established from the thermodynamic studies. A surface area of 2.763 m2/g was obtained. The equilibrium and kinetics of sorption was best described by the Langmuir and the pseudo-second-order models, respectively. The sorption process was spontaneous (−ΔG0=28.72−31.77 kJ/mol) and endothermic in nature (ΔH0=17.45 kJ/mol). The positive value of ΔS0 (0.15 kJ/molK) implies increased randomness of the sorbate molecules at the surface of the sorbent. This study presents sustainable management of wastewater using MNS as a potential low-cost sorbent for dye decontamination from aqueous solution.

scholarly journals Preparation of 1-Hydroxy-2,5-hexanedione from HMF by the Combination of Commercial Pd/C and Acetic Acid

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2475 ◽  
Author(s):  
Yanliang Yang ◽  
Dexi Yang ◽  
Chi Zhang ◽  
Min Zheng ◽  
Ying Duan
Keyword(s):  
Aqueous Solution ◽  
Acetic Acid ◽  
Reaction Time ◽  
Catalytic System ◽  
Biomass Conversion ◽  
High Concentration ◽  
Influence Of Temperature ◽  
Catalyst Amount

The development of a simple and durable catalytic system for the production of chemicals from a high concentration of a substrate is important for biomass conversion. In this manuscript, 5-hydroxymethylfurfural (HMF) was converted to 1-hydroxy-2,5-hexanedione (HHD) using the combination of commercial Pd/C and acetic acid (AcOH) in water. The influence of temperature, H2 pressure, reaction time, catalyst amount and the concentration of AcOH and HMF on this transformation was investigated. A 68% yield of HHD was able to be obtained from HMF at a 13.6 wt% aqueous solution with a 98% conversion of HMF. The resinification of intermediates on the catalyst was characterized to be the main reason for the deactivation of Pd/C. The reusability of the used Pd/C was studied to find that most of the activity could be recovered by being washed in hot tetrahydrofuran.

Rhodium-catalyzed aminohydroxylation of unactivated alkenes in aqueous media for the benign synthesis of 1,2-amino alcohols

2019 ◽  
Vol 21 (4) ◽  
pp. 780-784 ◽  
Author(s):  
Yufeng Shi ◽  
Yufan Wang ◽  
Xunbo Lu ◽  
Yulong Zhang ◽  
Yuzhou Wu ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Amino Alcohols ◽  
Benign Synthesis ◽  
First Time

An efficient catalytic aminohydroxylation reaction of alkenes in aqueous media is disclosed for the first time.

A reversible fluorescent-colorimetric chemosensor based on a novel Schiff base for visual detection of CO32− in aqueous solution

RSC Advances ◽  
2016 ◽  
Vol 6 (76) ◽  
pp. 72185-72192 ◽  
Author(s):  
Anupam Ghorai ◽  
Jahangir Mondal ◽  
Rukmani Chandra ◽  
Goutam K. Patra
Keyword(s):  
Aqueous Solution ◽  
Schiff Base ◽  
Visual Detection ◽  
Colorimetric Detection ◽  
Aqueous Media ◽  
Rapid Response ◽  
Colorimetric Chemosensor ◽  
Excellent Selectivity

A novel Schiff base receptor L has been fabricated for fluorescent-colorimetric detection of CO32− in aqueous media. L shows an excellent selectivity, rapid response and reversibility and its sensitivity for CO32− is the lowest ever found (96 nM).

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