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In this research work, polyurethane sponge (PUS) is used as a readily removable substrate for the synthesis of different nanoparticles on the surface and its use in reducing toxic dyes. An acidic aqueous solution of 0.5 wt% chitosan (CH) was coated on PUS to prepare an ionophilic CH-PUS material. The CH-PUS pieces were then kept in 0.05 M concentration of four different salt solutions. After absorbing the metal ions for a 4 h time period, the CH-PUS pieces were treated with 0.2 M NaBH solution to convert the adsorbed ions to the analogous metal nanoparticles. The bare PUS, CH-PUS and M/CH-PUS were analyzed by various spectroscopic techniques. After catalytic testing of different M/CH-PUS under similar conditions using a model reaction of 4-nitrophenol reduction by NaBH, we found that Cu/CH-PUS outperformed among the other M/CH-PUS. The Cu/CH-PUS catalyzed the 4-NP reduction with the fastest reaction rate constant of 0.7923 min. We also tested with different factors affecting the reaction rate constant such as different weights of catalyst, various concentrations of 4-nitrophenol and NaBH. Lastly, after testing Cu/CH-PUS catalyst for the reduction of different dyes, its high performance was observed for the congo red dye.
This article was published in the following journal.
Name: International journal of biological macromolecules
In this study, internalization of positively charged chitosan-coated nanoparticles (AuNPs@chitosan) on MCF-7 cells was investigated by γ-ray spectroscopy and then statistically compared to that of Au...
Flexible pressure sensors still face a great challenge to combine fast frequency response, wide pressure range, multiple detection modes, satisfactory mechanical and environmental stability, and simpl...
We have used discrete polyoxopalladates(II) (POPs) of the MPdX nanocube- and PdX nanostar-types (M = central metal ion, X = capping group) as molecular precursors (diameter ca. 1 nm) for the formation...
We developed a general platform for the fabrication of transition metal oxide nanoparticles supported by a graphene foam (GF) by first coating it with a methacrylated gelatin (GelMA) hydrogel, which s...
The catalytic reduction of diverse pollutants by noble metal catalysts in the presence of reductants is a highly effective and widely used method. However, the considerable cost of noble metal catalys...
Aim of the present study is to assess the in vivo susceptibility of root canal bacteria to Chitosan,Chitosan nanoparticles ,and Chlorhexidine gluconate when used as intra canal medicaments...
A randomized clinical trial that aims to study the effect of chitosan nanoparticles (CS-np) versus sodium hypochlorite as a root canal irrigant on postoperative pain and antibacterial acti...
Evaluation of slow-release Tb4 collagen and chitosan porous sponge scaffolds skin substitutes the effectiveness of clinical trials for the treatment of difficult to heal wounds and securit...
The purpose of this study is to compare the use of chlorhexidine-gel-impregnated dressing and the transparent polyurethane film dressing as coverage of the site of insertion of central ven...
Chitosan is a natural product that is produced commercially through the deacetylation of chitin, which is found in the exoskeleton of crustaceans. It has been suggested that chitosan has a...
Nanometer-sized particles that are nanoscale in three dimensions. They include nanocrystaline materials; NANOCAPSULES; METAL NANOPARTICLES; DENDRIMERS, and QUANTUM DOTS. The uses of nanoparticles include DRUG DELIVERY SYSTEMS and cancer targeting and imaging.
Nanoparticles produced from metals whose uses include biosensors, optics, and catalysts. In biomedical applications the particles frequently involve the noble metals, especially gold and silver.
Proteases which use a metal, normally ZINC, in the catalytic mechanism. This group of enzymes is inactivated by metal CHELATORS.
Synthesized magnetic particles under 100 nanometers possessing many biomedical applications including DRUG DELIVERY SYSTEMS and CONTRAST AGENTS. The particles are usually coated with a variety of polymeric compounds.
A photoelectric method of recording an X-ray image on a coated metal plate, using low-energy photon beams, long exposure time and dry chemical developers.