Journal Article

Removal of the herbicide 2,4-dichlorophenoxyacetic acid from water by using an ultrahighly efficient thermochemically activated carbon/Uklanjanje herbicida 2,4-dihlorofenoksi sircetne kiseline iz vode koriscenjem ultra-efikasnog termohemijski dobijenog aktivnog uglja

Bojic, Danijela V, Kostic, Milos M, Velinov, Nena D, Petrovic, Milica M, Najdanovic, Slobodan M, Bojic, Aleksandar Lj, Vucic, Miljana D. Radovic

2019

Overview

Lagenaria vulgaris activated carbon (LVAC) was synthesized from Lagenaria vulgaris biomass by treatment with diluted [H.sub.2]S[O.sub.4] followed by thermo-chemical carbonization and overheated steam activation process and used for removal of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). Fourier transform infrared spectroscopy (FTIR) indicated that 2,4-D is adsorbed in micropores of the very porous LVAC (665 [m.sup.2] [g.sup.-1]). LVAC showed high sorption capacity as compared to many previously used sorbents at optimal conditions: the stirring rate of 300 rpm, the sorbent dose of 1.0 g [dm.sup.-3] and pH from 2 to 7. The experimental maximum sorption capacity of LVAC was 333.3 mg [g.sup.-1]. The pseudo-second-order model and Chrastil model described the 2,4-D sorption kinetics by LVAC. Thermodynamic studies have indicated that the sorption process was endothermic, spontaneous and physical in nature. LVAC was shown to be an ultrahighly efficient sorbent for removal of 2,4-D from groundwater, which could be also recycled and reused. Keywords: Activated carbon; 2,4-D; groundwater; recycling and reusing; thermodynamics Dostupno na Internetu sa adrese casopisa: (Naucni rad) Aktivni ugalj Lagenaria vulgaris (LVAC), sintetisan iz biomase Lagenaria vulgaris tretiranjem sa razblazenom [H.sub.2][SO.sub.4], pracenim termohemijskom karbonizacijom i procesom aktivacije pomocu pregrejane pare, koriscen je za uklanjanje herbicida 2,4-dihlorofenoksi sircetne kiseline (2,4-D). Infracrvena spektroskopija sa Furijeovom (Fourier) transformacijom (FTIR) je ukazala da se sorpcija 2,4-D odvija u mikroporama vrlo poroznog LVAC (665 [m.sup.2] [g.sup.-1]). LVAC je pokazao veliki kapacitet sorpcije u poredenju sa mnogim prethodno koriscenim sorbentima u optimalnim uslovima: brzina mesanja od 300 rpm, doza sorbenta 1,0 g [dm.sup.-3] i pH od 2 do 7. Maksimalni eksperimentalni sorpcioni kapacitet LVAC bio je 333,3 mg [g.sup.-1]. Model pseudo-drugog reda i Krastilov (Chrastil) model su dobro opisali sorpciju 2,4-D na LVAC. Termodinamicka ispitivanja su pokazala da je proces sorpcije bio endoterman, spontan i fizicke prirode. LVAC se pokazao kao ultra-efikasan sorbent za uklanjanje 2,4-D iz podzemnih voda, a takode moguce ga je reciklovati i ponovo koristiti. Kljucne reci: aktivni ugalj; 2,4-D; podzemna voda; recikliranje i ponov-na upotreba; termodinamika

• Publisher: Association of Chemical Engineers of Serbia
• Subject: Analysis / Auxins / Groundwater / Growth regulators / Herbicides / Infrared spectroscopy / Spectroscopy / Thermal properties / Thermodynamics / Water