نتایج جستجو برای: activated carbons
تعداد نتایج: 225396 فیلتر نتایج به سال:
Introduction Modification of the precursors or ready activated carbons permits getting materials of improved adsorption and catalytic properties or of specific acid-base or hydrophobic-hydrophilic character. Particularly promising are the activated carbons enriched in nitrogen because of wide possibilities of use of such materials. In particular, they can find applications related to protection...
In this study, granular activated carbon, GAC, was modified by oxidation with H2O2 and NaClO aqueous solutions and heat treatment at 900 °C. The N2 adsorption isotherms at −196 °C and SEM and FTIR results were used to characterize the properties of the prepared ACs. Textural parameters such as BET surface area and pore volumes were assessed by gas adsorption. The BET surface area values of soli...
Activated carbon (AC) was prepared from date palm leaflets using NaOH activation. AC oxidized concentrated HNO3 to produce activated (ON). Alkylamines including methylamine (M), dimethylamine (DM), ethylamine (E), diethylamine (DE), and diisopropylamine (DIP) were covalently immobilized onto ON ONM, ONDM, ONE, ONDE, ONDIP hydrophobic carbons, respectively. The surface area of (588 m2/g) decreas...
Phenols are an important group of organic pollutants present in many industrial effluents such as petro-chemicals, textiles, tanneries; gasification units etc. The phenols should not exceed 0.01μg/l, 1mg/l in drinking & in industrial waters, respectively. But in most of the cities the situation is alarming where the phenol concentrations are more often crossed 8–10 ppm. For removal of the exces...
Current water treatment technologies are inefficient at treating water contaminated with metaldehyde, an 8-member cyclic tetramer of acetaldehyde widely used as a molluscicide in large-scale agriculture and in gardens, and which has been frequently observed to breach European regulatory limits in the UK due to its high solubility and frequent use. Here, we examine the controls on metaldehyde ad...
Activated carbons with different textural and chemical surface characteristics were synthesized from waste biomass and low rank coals, and furthermore used as a host matrix for cobalt species, varying the preparation and modification methods. The obtained activated carbons and modified samples were characterized by complex of various physicochemical methods, such as: low temperature physisorpti...
Activated carbons were produced from spent tyre pyrolysis char by steam or CO2 activation and evaluated for their performance in rhodamine B (RhB) adsorption aqueous solutions. The effect of RhB starting concentration (80–150 mg L−1), contact time (0–80 min), temperature (298–318 K) initial pH on the process was examined. Pseudo-first-order pseudo-second-order models carried out to fit experime...
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