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- 저자 : Marija Vukčević (검색결과 2 건)
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Danijela Prokić,Marija Vukčević,Ana Kalijadis,Marina Maletić,Biljana Babić,Tatjana Đurkić 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10
This paper explores the applicability of unmodified and chemically modified activated carbon cloths (ACCs) forthe removal of estrone, 17β-estradiol, and 17α-ethinylestradiol from water. In order to examine the influence of surfaceproperties on hormone adsorption, chemical modification of ACCs with HNO3, HCl, or KOH was employed. Appliedtreatments increased the specific surface area and changed the content of oxygen functional groups. Increased content ofacidic surface oxygen functionalities enhanced adsorption efficiency up to 30 % and had a more dominant influence onadsorption capacity than specific surface area. Adsorption of estrone, 17β-estradiol, and 17α-ethinylestradiol followedpseudo-second-order kinetic model, while the equilibrium adsorption data fitted well with the Freundlich isotherm model. Calculated mean sorption energy values of 1.4475, 1.3387, and 1.0541 kJ/mol, for E1, E2, and EE2 respectively, indicatedthat removal of selected hormones was dominated by physisorption mechanism. Obtained Langmuir adsorption capacities,12.34, 12.66, and 11.11 mg/g for estrone, 17β-estradiol, and 17α-ethinylestradiol, respectively, as well as convenience ofmanipulation, recommend activated carbon cloth modified with HNO3 as an efficient adsorbent for removing estrogenhormones from the water.
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Aleksandar Zdujić,Katarina Trivunac,Biljana Pejić,Marija Vukčević,Mirjana Kostić,Milan Milivojević 한국섬유공학회 2021 Fibers and polymers Vol.22 No.1
Ca-alginate particles (CA) and alginate-impregnated hemp fibers (AH) (both, as prepared, dried, and rehydrated)were used as adsorbents for removal of Ni (II) ions from water. Adsorption was examined in the batch system andexperimentally obtained data were analyzed by both linear and nonlinear curve fitting using pseudo-first and pseudo-secondorderrate, as well as Langmuir, Freundlich, and Sips equations. The concentration of Ni (II) ions was measured by atomicabsorption spectrophotometry, while the Fourier transform infrared spectroscopy was used for characterization of adsorbentsurface, before and after the adsorption. Although all tested samples showed similar adsorption capacities of 12 mg/g, it wasfound that rehydration improves adsorption characteristics of AH and increases the removal efficiency above 90 %. Adsorption of Ni (II) ions can be sufficiently described by both kinetic models and Sips isotherm equation, and this relativelyfast process presumably occurs through the mechanism of physisorption and ion-exchange. The obtained results proved thatCa-alginate particles and alginate-impregnated hemp fibers have good potential to reduce nickel concentrations in a costeffectiveand efficient manner.
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