Poly(ethylene imine) (PEI) has abundant amino groups in a macromolecular chain and can be used as a graft source for metal nanocomposites, which shows excellent ability to form stable complexes with heavy metal ions. In this work, a simple and convenient method was used to make PEI into a stable hydrogel with 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide-N-hydroxysuccinimide and subsequently coprecipitate with silver nitrate solution or palladium chloride solution to form metal-loaded composite hydrogels. In addition, the characterizations of composite hydrogels were investigated by scanning electron microscopy, specific surface area tests (Brunauer–Emmett–Teller), X-ray photoelectron spectroscopy, and ultraviolet spectroscopy. The properties of composite hydrogels on the catalytic reduction of 4-nitrophenol were studied. The results showed that the composite hydrogels could be easily separated from the water environment, which indicated the large-scale potential application in organic catalytic degradati...
: The catalytic reduction of nitro compounds is currently a hot research area, how to efficiently and stably degrade such toxic and harmful substances has become the research goal of many researchers. In this work, an Artemia cyst shell (ACS)-TiO2-MoS2 ternary porous structure was proposed and prepared as a catalyst for the reduction of 2-nitroaniline (2-NA) and 4-nitrophenol (4-NP). The ACS has a large number of porous structures, exhibits a good binding ability with TiO2 and MoS2, and provides...
Abstract As Prussian Blue analogues (PBAs) represent one of the most classical families of coordination compounds and exhibit versatile catalytic activities, PBAs have been considered as useful heterogeneous catalysts for reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). Nevertheless, while Cu has been a well-proven transition metal for 4-NP reduction, especially, due to their ability to attain pronounced conversions of reactants under mild conditions, environmental friendliness and gre...
The construction of heterojunctions provides a promising strategy to improve photocatalytic hydrogen evolution. However, how to fabricate a nanoscale TiO2/g-C3N4 heterostructure and hinder the aggregation of bulk g-C3N4 using simple methods remains a challenge. In this work, we use a simple in situ construction method to design a heterojunction model based on molecular self-assembly, which uses a small molecule matrix for self-integration, including coordination donors (AgNO3), inorganic titaniu...
With the rapid development of industry, the problem of environmental pollution has become increasingly prominent. Exploring and preparing green, efficient, and low cost catalysts has become the key challenge for scientists. However, some conventional preparation methods are limited by conditions, such as cumbersome operation, high energy consumption, and high pollution. Here, a simple and efficient seed-mediated method was designed and proposed to synthesize a highly efficient bimetallic catalys...
Self-assembled hydrogel materials constructed from cyclodextrin polymer (P-CD)/adamantane-modified poly acrylic acid (PAA-Ad) were designed and prepared via host–guest interactions. It was observed that the prepared supramolecular hydrogels had an interconnected three-dimensional porous network. In addition, the obtained hydrogels showed a recovery performance and it was confirmed that the host–guest interactions between β-cyclodextrin and adamantane were the main driving force for the formation...
#2Wenjie Chen(CAS: Chinese Academy of Sciences)H-Index: 5
Last. Pengfei Duan(CAS: Chinese Academy of Sciences)H-Index: 31
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Achieving a higher dissymmetry factor is a crucial issue in developing circularly polarized luminescence (CPL) materials. Here, by tailoring the solvent composition and the morphology of the same chiral emissive small molecules (R- or S-SPAn), circularly polarized emission with a boosted dissymmetry factor (two orders) was realized. It was found that by regulating the water fraction in the mixed THF/H2O, we were able to achieve kinetic control over association of chiral emissive R- or S-SPAn int...
In recent years, people pay more attention to environmental pollution and the treatment of sewage has become the focus of recent research. Palladium nanoparticles have good catalytic properties but are easy to agglomerate. Therefore, we used the electrospinning technology to prepare a uniform composite nanofiber film based on polyacrylic acid (PAA) and polyvinyl alcohol (PVA), which demonstrated that they are good carriers of palladium nanoparticles to make the nanoparticles well dispersed. Furt...
Last. Kam Chiu Tam(UW: University of Waterloo)H-Index: 72
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Abstract A sustainable nanomaterial, cellulose nanofibril (CNF) was used to prepare aerogel sorbents to remove various contaminants in wastewater. A mussel-inspired coating strategy was used to introduce polydopamine onto the surface of CNFs, which were cross-linked with polyethylenimine (PEI) to form the aerogels. The synthetic procedure was optimized to achieve a minimal consumption of raw materials to produce a robust porous structure. The aerogels possessed a low density (25.0 mg/cm3), high ...
The effective synthesis and self-assembly of nanocomposites were of key importance for a broad range of nanomaterial applications. In this work, new carbon nanotube (CNT)-Cu2O nanocomposites were successfully synthesized via a facile approach. CNT was selected as the anchoring substrate to load Cu2O nanoparticles to prepare composite catalysts with well stability and good reusability. It is discovered that the prepared CNT-Cu2O nanocomposite materials could be effectively controlled via regulati...
The excellent physical and chemical properties of cyclodextrin polymer (poly-CD)/azobenzene-modified polyacrylic acid (PAA-Azo) binary composite hydrogels have been designed and prepared. The prepared hydrogels were subjected to a variety of characterizations, including scanning electron microscopy, ultraviolet spectroscopy, circular dichroism spectroscopy, infrared spectroscopy, rheological properties, and specific surface area tests. It was found that the obtained hydrogels have the cross-link...
Abstract null null In the membrane distillation process, the anti-fouling ability of the membranes is one of the main factors that affect the use of the membranes. In this paper, the Silver/Polyvinylidene fluoride - Polydimethyl siloxane (Ag/PVDF-PDMS) hydrophilic-hydrophobic Janus composite membrane was prepared by chemical reduction method to construct the underwater oleophobic silver layer on the surface of the hydrophobic Polyvinylidene fluoride - Polydimethyl siloxane (PVDF-PDMS) membrane, ...
Abstract null null The fabrication of metallic oxide nanoparticles in a matrix material for use in catalysis has piqued researchers' curiosity, particularly in the aqueous phase. In this work, Multi-walled carbon nanotubes decorated with tungsten trioxide nanocomposites structure exhibit improved catalytic reduction activity in comparison to the used MWCNTs. the nanocomposites structure was prepared in just one step by infrared pulsed laser ablation (Nd:YAG laser, 1064 nm) of tungsten plate imme...
Abstract null null Stimuli-responsive hydrogels that can change their properties as a result of external stimuli have shown great promise in various applications, but it is still a great challenge to simultaneously provide hydrogels with excellent mechanical properties and significant response. Herein, we propose a facile synthesis of smart PAAm based hydrogels with highly elastic and swellable by introducing the activated nanoparticles into the hydrogel networks. Due to the heterogeneous microp...
Last. Liu Xiaofei(TJU: Tianjin University)H-Index: 3
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Abstract Hydrogel sensor has been widely researched for their flexibility and elasticity; however, its poor mechanical, anti-dry and anti-freezing properties hinder its application in wearable devices seriously. Herein, a flexible, ultra-tough, excellent self-recoverable, anti-dry and anti-freezing ionic EG/MoS2-PAAM-Fe3+ organohydrogel was prepared by adding ethylene glycol to the MoS2-PAAM-Fe3+ hydrogel using solvent exchange method. And due to the pyramid microstructures at the bottom, the “c...
Last. Arafat Toghan(SVU: South Valley University)H-Index: 8
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Silver nanoparticles (Ag NPs) were decorated with different amounts on the exterior walls of carbon nanotubes (CNTs) by a laser ablation assisted method, especially in liquid media to be applied as a good adsorption material against naphthalene. The laser ablation time was controlled the amount of decoration Ag NPs on CNTs. The prepared nanocomposite was analyzed via different analytical techniques. Ag NPs with a small size distribution of 29 nm are uniformly decorated with spherical shape on CN...
Last. Arafat Toghan(SVU: South Valley University)H-Index: 8
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Abstract null null ZnO nanoparticles and their decoration on the CNTs with different concentrations were well-prepared by pulsed laser ablation method in liquid environment in just one step for removal 4-nitrophenol. The changing of the generated nanostructured materials was based on the surrounding medium: ultra-pure water and the functionalized CNTs solution, while the concentration amounts of the generated ZnO nanoparticles were controlled via irradiated laser time. The properties of the synt...
A direct imination reaction was developed by tandem reaction of alcohols and nitro compounds in the presence of Cu-isatin Schiff base-γ-Fe2O3 as a nanomagnetically recyclable catalyst under solvent-free conditions. By this method, various imines were prepared in good to high yields from one-pot reaction of various alcohols (primary aromatic and aliphatic) and nitro compounds (aromatic and aliphatic) via an auto-hydrogen transfer reaction. Use of an inexpensive and easily reusable catalyst, witho...
In order to improve the corrosion resistance of zinc-rich epoxy coatings and reduce the amount of zinc used, first, graphene oxide (GO) was modified by sulfonated multiwall carbon nanotubes (SMWCNTs) to obtain the modified graphene oxide (SM-GO). The samples were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and Raman spectroscopy. Then, four kinds of coatings were prepared, namely pure zinc-rich coating (0-ZRC), graphene oxide-based zinc-rich coating ...