Removal of Pyridine from Aqueous Solution by Adsorption on an Activated Carbon Cloth

Abstract

Pyridine is a very toxic pollutant that has to be removed from wastewater. In this work, adsorption of pyridine on activated carbon cloth (ACC) is studied as a possible alternative for eliminating pyridine from aqueous solution. The ACC was produced from polyacrylonitrile. The adsorption equilibrium data of pyridine on ACC was obtained in a batch adsorber. The experimental data was interpreted with the isotherms of Langmuir, Freundlich, and Prausnitz-Radke (PR), and the PR isotherm better represented the experimental data. The capacity of ACC for adsorbing pyridine was favored increasing the solution pH from 3 to 6, and this effect was due to the p-p dispersive and electrostatic interactions between the pyridine species in solution and the surface complexes of ACC. The modified Langmuir model fitted reasonably well the influence of pH on the adsorption capacity. In this model was assumed that both neutral pyridine and pyridinium were simultaneously adsorbed on ACC accordingly to the experimental results. The adsorption capacity was almost independent of temperature. The reversibility study revealed that 75% of the pyridine can be desorbed from ACC indicating that part of the pyridine was irreversibly adsorbed, and possibly chemisorbed.

Adsorption of pyridine from aqueous solutions by polymeric adsorbents MN 200 and MN 500. Part 2: Kinetics and diffusion analysis

“…Many studies have explored pyridine adsorption performance using porous materials including activated carbons [9][10][11][12], clayey till and zeolites [13,14], synthetic apatite [1], polymer resins [15,16], and metal organic frameworks [17,18].…”

Determination of surface functional groups on mechanochemically activated carbon cloth by Boehm method

“…U velikom broju radova opisan je uticaj mehaničke deformacije različitih vrsta materijala kako onih organskog porekla, tako i neorganskih, kojom je postignuta sinteza novih materijala i poboljšanje već postojećih osobina [2,6,15,16]. Sveobuhvatni pregled literature ukazuje na veliki broj metoda koje su korišćene za modifikaciju ugljenične tkanine: aktivacija kiselinama i bazama, oksidacija, modifikacija laserima [17][18][19][20][21][22]. Meñutim, nema podataka o primeni mehaničkog mlevenja na modifikaciju površine ugljenične tkanine.…”

“…Karboksilne, fenolne i laktonske ubrajaju se u kisele kiseonične grupe, dok su pironske, hinonske i druge grupe bazne (slika 1). Prisustvo i vrsta površinskih grupa odreñeno je vrstom početnog materijala (prekursora) od koga se ugljenični materijali dobijaju, procesa aktivacije ili posttretmanima u kojima se kiseonik, vodonik i dr. elementi uvode u strukturu [19][20][21][22]. U okviru ovog rada je ispitan uticaj mehaničkog mlevenja u različitim atmosferama (inertnoj i atmosferi vazduha) na broj i vrstu funkcionalnih grupa na površini tkanine.…”

“…0,15 g uzorka odmereno je u plastične bočice zapremine 25 ml. Nakon dodavanja 20 ml sledećih rastvora: 0,1 M natrijum hidroksid (NaOH), 0,05 M natrijum bikarbonat (NaHCO 3 ), 0,05 M natrijum karbonat (Na 2 CO 3 ) i 0,1 M hlorovodonična kiselina (HCl), bočice su zatvorene i ostavljene na mućkalici 24 h. Nakon filtriranja (filter ALLPURE NY 0,45) odmereno je 10 ml svakog uzorka koji su potom titrovani sa 0,1 M rastvorima HCl ili NaOH, u prisustvu indikatora metil-oranža i fenolftaleina [21].…”

Development and Environmental Applications of Activated Carbon Cloths

“…In turn, it was found that intrafiber diffusion of the three latter compounds in ACC was reduced by hindered diffusion, which was explained by steric exclusion, drag effects, and obstruction due to molecules adsorbed on the pore walls. Furthermore, the effect of the solution pH and of the temperature on the adsorption of pyridine onto the same commercial PAN-based ACC was also recently examined [156]. The adsorption capacity of the ACC was found to increase by increasing the solution pH from 3 to 6, but it was almost independent of the temperature in the range investigated ∘ C).…”