Naslov
Sorption of diazo dye on fly ash

Autori
Šokčević, Zrinka ; Ćurković, Lidija ; Ukić, Šime ; Jukić, Mirela ; Šipušić, Juraj

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

Izvornik
XI. susret mladih kemijskih inženjera 2016. / Matijašić, Gordana - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 2016, 162-162

ISBN
978-953-6894-55-0

Skup
XI. susret mladih kemijskih inženjera 2016.

Mjesto i datum
Zagreb, Hrvatska, 18.02.2016. - 19.02.2016

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
sorption ; fly ash

Sažetak
The goal of this work was to investigate the application of fly ash as a sorbent for removal of toxic and cancerogenic diazo dye, Congo red, from aqueous solutions. Batch sorption process was performed in order to examine the removal of Congo red dye using fly ash by varying the initial dye concentration, contact time and temperature of the process. Langmuir, Freundlich and Dubinin-Radushkevich isotherms were used to analyze the equilibrium data at different temperatures. A linear regression method was used for comparison of the isotherms. The equilibrium data could be well described by the Langmuir isotherm. Three kinetic models (pseudo-first-order, pseudo- second-order and intra-particle diffusion) were used to predict the sorption rate constants. The sorption kinetic was found to follow pseudo-second-order rate kinetic model and the intra-particle diffusion was one of the rate determining steps. Thermodynamic parameters of sorption process (free energy, enthalpy, and entropy) were calculated. The negative values of free energy, enthalpy and entropy suggested that the sorption was spontaneous, exothermic and stable.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Strojarstvo, Temeljne tehničke znanosti

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