65 research outputs found
Tailoring properties of resol resin-derived spherical carbons for adsorption of phenol from aqueous solution
The polycondensation of resorcinol and formaldehyde in a water–ethanol mixture using the adapted Stöber method was used to obtain resol resins. An optimization of synthesis conditions and the use of an appropriate stabilizer (e.g., poly(vinyl alcohol)) resulted in spherical grains. The resins were carbonized in the temperature range of 600–1050 °C and then chemically activated in an aqueous HNO3 solution, gaseous ammonia, or by an oxidation–reduction cycle (soaking in a HNO3 solution followed by treatment with NH3). The obtained carbons were characterized by XRD, the low-temperature adsorption of nitrogen, SEM, TGA, and XPS in order to determine degree of graphitization, porosity, shape and size of particles, and surface composition, respectively. Finally, the materials were tested in phenol adsorption. The pseudo-second order model perfectly described the adsorption kinetics. A clear correlation between the micropore volume and the adsorption capacity was found. The content of graphite domains also had a positive effect on the adsorption properties. On the other hand, the presence of heteroatoms, especially oxygen groups, resulted in the clogging of the pores and a decrease in the amount of adsorbed phenol
Effect of decoration of core-shell composites with nano-Ag particles on photocatalytic activity in 4-nitrophenol degradation
Polymer template assisted construction of spherical yolk-shell nanoreactors for catalytic combustion of volatile organic compounds
Study on self-assembled monolayer of functionalized thiol on gold electrode forming capacitive sensor for chromium(VI) determination
Sensibilization of p-NiO with ZnSe/CdS and CdS/ZnSe quantum dots for photoelectrochemical water reduction
NiO/poly(4-alkylthiazole) hybrid interface for promoting spatial charge separation in photoelectrochemical water reduction
Electrochemical denitrification and oxidative dehydrogenation of ethylbenzene over N-doped mesoporous carbon : atomic level understanding of catalytic activity by NMR spectroscopy
- …