Naslov
Diclofenac Removal by H2SO4 – Functionalized Activated Carbon Produced from Walnut Shells

Autori
Stjepanović, Marija ; Miljević, Ivana ; Velić, Natalija ; Habuda-Stanić, Mirna

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
EMEC 21 - Book of Abstracts / Ivančev-Tumbas, Ivana ; Beškoski, Vladimir P. ; Šajnović, Aleksandra - : Serbian Chemical Society, 2021, 108-108

ISBN
978-86-7132-078-8

Skup
21st European Meeting on Environmental Chemistry (EMEC 2021)

Mjesto i datum
Novi Sad, Srbija, 30.11.2021. - 03.12.2021

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
adsorption ; diclofenac ; activated carbon ; walnut shells

Sažetak
Pharmaceuticals are compounds used to treat and prevent diseases in both humans and animals and as growth promoters in veterinary medicine. They are biologically active and persistent in the environment. Although they are detected in drinking and surface water, and in wastewater in low concentrations, these substances are recognised as emerging contaminants (ECs). They can be harmful to the environment causing aquatic toxicity, genotoxicity, endocrine disruption etc. Therefore, it is necessary to detect and effectively remove pharmaceuticals from the environment. Diclofenac (DCF) belongs to a group of non- steroidal anti-inflammatory drugs, among which exhibits the highest acute toxicity. It is commonly used to treat inflammation and pain in pathologies, such as rheumatoid arthritis. Because of its extensive consumption, it is frequently found in aquatic environments. DCF has been found in both drinking water (at concentrations below 10 ng/L) and wastewater. Studies showed that conventional treatment processes are relatively inefficient in removing DCF from wastewater. When removing pharmaceuticals, adsorption onto activated carbon as an adsorbent showed high efficiency due to its high surface area. The aim of this study was to investigate the adsorption of diclofenac onto H2SO4-functionalized activated carbon produced from walnut shells in batch processes. Diclofenac batch adsorption was studied through equilibrium and thermodynamic perspectives with isotherm at three different temperatures. Adsorption kinetics was also assessed. According to obtained data, the maximum adsorption capacity of 24 mg/g was achieved. The values of 1/n for Freundlich isotherm was less than unity, which indicates that the adsorption was nonlinear and favourable. In order to describe adsorption mechanisms, kinetic models were also calculated. Adsorption kinetics followed the pseudo-second- order model closely. Activated carbon from walnut shells proved to be an effective adsorbent for diclofenac removal.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Biotehnologija, Prehrambena tehnologija

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