The effects of urea modification and heat treatment on the process of NO2 removal by wood-based activated carbon

Effect of Chemical Oxidation on the Adsorption Properties of Cationic Dye on Activated Carbons Prepared from Locally Atropa belladonna

“…After oxidation, this band is not observed and a broadening in the intensity of band located at 1630 cm -1 is occurred. Shoulder bands at 1458-1386 cm -1 conjugated with strong band at 1630 cm -1 may be ascribed to the presence of carboxylic acid, carbonyl-carbonates and quinones, also moieties such as C=N, C=C and NH 3 in aromatic rings [5][6][7][8][9][10][11]. Finally, the presence of C-H outof-plane bending vibrations in the aromatic ring is identified by the appearance of small bands at 800-420cm -1 .…”

“…Moreover, potentiometric titration has been a convenient analysis method of surface chemistry of activated carbon through determining surface charge [8,9]. Thus, the total amount of each acidic and basic surface groups introduced into surface of activated carbon was evaluated by the potentiometric titration method.…”

“…Each sample was titrated with ~ 0.01 mol/L KOH titrant with 0.001 mL increments. These experiments were carried out in the pH range 4-11 [8,9].…”

“…Generally, the adsorption capacity of ACs significantly depended on their surface chemistry and is largely influenced by both quantity and type of the surface functional groups. Accordingly, many studies have considerable interests in the improvement of the surface chemistry properties of ACs via chemical oxidation and reported their relations with the adsorption of dyes and heavy metals in the last two decades [3][4][5][6][7][8][9][10][11][12][13].…”

Effect of heat treatment on the physicochemical properties of nitrogen-enriched activated carbons

“…ammonia [22,23], urea [24,25], nitrogen oxides [26], hydroxyl amine and hydrazine [27], (2) pyrolysis/activation (mainly physical) of polymers or rich in nitrogen vegetation origin precursors (e.g. polyacrylonitrile [28], polyamides [29], polyimides [30] and waste material left after soybean growing and processing [31]; and (3) impregnation of carbons with solutions of amines and imines of any order [32,33] or coating carbons with a layer of polymers containing nitrogen in their structure [34].…”