Immobilization of Polymeric Luminophor on Nanoparticles Surface

Polymeric luminophors with reduced toxicity are of the priorities in the production of lighting devices, sensors, detectors, bioassays or diagnostic systems. The aim of this study was to develop a method of immobilization of the new luminophor on a surface of nanoparticles and investigation of the structure of the grafted layer. Monomer 2,7-(2-hydroxy-3-methacryloyloxypropoxy)naphthalene (2,7-NAF.DM) with luminophoric properties was immobilized on silica and carbon nanotubes in two ways: mechanical mixing with previously obtained polymer and by in situ oligomerization with chemisorption after carrier’s modification with vinyl groups. The attached polymeric (or oligomeric) surface layer was studied using thermal and spectral techniques. Obtained results confirm the chemisorption of luminophor on the nanotubes and silica nanoparticles at the elaborated synthesis techniques. The microstructure of 2,7-NAF.DM molecules after chemisorption was found to be not changed. The elaborated modification approach allows one to obtain nanoparticles uniformly covered with polymeric luminophor

Chitosan Immobilized on Silica Surface for Wastewater Treatment

Adsorbents of natural origin are widely used for industrial wastewater treatment in order to replace current costly methods of heavy metals removing from solutions. For that purpose, immobilization of chitosan on the silica gel surface by crosslinking of adsorbed biopolymer with glutaraldehyde was carried out. Anchorage of chitosan on the silica surface was confirmed by IR spectroscopy. Concentration of immobilized chitosan was estimated using thermogravimetric analysis. The adsorption of microquantities of Zn(II), Cu(II), Cd(II), Pb(II), Fe(III), V(V) and Mo(VI) ions from aqueous solutions by obtained composite has been studied. The highest sorption capacities were observed with respect to zinc (0.46 mmol/g), molybdenum- and vanadium-containing ions (0.31 mmol/g). Diffuse reflectance electronic spectra of samples with different content of adsorbed metal and kinetic adsorption characteristics of the composite adsorbent were estimated. DOI: http://dx.doi.org/10.5755/j01.ms.20.2.4975</p

Właściwości termiczne porowatych nanokompozytów poliakrylan sodu/krzemionka

Porous sodium polyacrylate/silica (SPA/SiO2) nanocomposites were obtained in a single-stage sol-gel process involving the acidic hydrolysis of tetramethoxysilane (TMOS) in the presence of SPA. The TMOS/SPA molar ratio ranged from 2:1 to 8:1. The physical and thermal properties of the nanocomposites were characterized by FTIR, SEM, TGA and adsorption analysis (BET, BJH). The mechanical and chemical treatment of the composite after the synthesis increased its specific surface area without significantly changing thermal properties. The process enables pore size control.Porowate nanokompozyty poliakrylan sodu/krzemionka (SPA/SiO2) otrzymano w jednoetapowym procesie zol-żel polegającym na kwaśnej hydrolizie tetrametoksysilanu (TMOS) w obecności SPA. Stosunek molowy TMOS/SPA wynosił od 2:1 do 8:1. Właściwości fizyczne i termiczne otrzymanych nanokompozytów scharakteryzowano za pomocą FTIR, SEM, TGA i analizy adsorpcyjnej (BET, BJH). Mechaniczna i chemiczna obróbka kompozytu po procesie syntezy zwiększyła jego powierzchnię właściwą bez znaczącej zmiany właściwości termicznych. Proces umożliwia kontrolę wielkości porów