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eng Adsorptive Removal of Pentavalent Arsenic from Aqueous Solutions by Granular Ferric Oxide
Zakhar, R.; Derco, J.; Čacho, F.; Čižmárová, O.
Chemical and Biochemical Engineering Quarterly Vol. 36, No. 2, 2022
Arsenic contamination of water resources, which is characterized by strong carcinogenic and toxic impacts, is a global problem. Therefore, the present study is focused on the isotherm and kinetic studies of pentavalent arsenic As(V) adsorption with initial concentration of 1 000 µg L−1 from aqueous solutions onto granular ferric oxide (GFO). Adsorption experiments were carried out by batch method, and the equilibrium and kinetic data were evaluated by the Langmuir, Freundlich, Dubinin-Radushkevich, Redlich-Peterson and Sips isotherm model, an...
Hrčak ID: 280938
eng The Study of Adsorption Kinetics of Flavan-3-Ols, Dihydrochalcones and Anthocyanins onto Barley β-Glucan
Matić, Petra; Ukić, Šime; Jakobek, Lidija
Croatica Chemica Acta Vol. 95, No. 1, 2022
Polyphenols can interact with dietary fibers and these interactions can affect polyphenols bioactivities. The interactions can be studied with the adsorption process, and adsorptions of flavan-3-ols (procyanidin B1, procyanidin B2), dihydrochalcones (phloretin, phloretin-2-glucoside), and anthocyanins (cyanidin-3-glucoside, cyanidin-3-galactoside) onto β-D-glucan from barley were studied in this work. The intention was to reveal the kinetics of the adsorption process. Adsorption was carried out using model solutions at room temperature. The...
Hrčak ID: 293308
eng Polymerization of 1,4-dinitrosobenzene: Kinetics and Submicrocrystal Structure
Bibulić, Petar; Rončević, Igor; Bermanec, Vladimir; Vančik, Hrvoj
Croatica Chemica Acta Vol. 90, No. 3, 2017
In this study, the structure of the polycrystalline poly(l,4-phenyleneazine N,N-dioxide) was investigated by Scanning Electron Microscopy and related with the previously calculated molecular structure. Kinetics of polymerization of 1,4-dinitrosobenzene, prepared by both cryogenic UV photolysis and in vacuo deposition were measured by time-resolved FT-IR spectroscopy. Acquired data was analyzed by curve fitting with the standard Avrami-Erofeev and two-step consecutive reactions models. Activation parameters were calculated from Arrhenius and Eyr...
Hrčak ID: 190801
eng Açaí Seeds as a Prospective Biosorbent for Acid Dyes Removal
Rossetto, R.; Maciel, G. M.; Fernandes, I. de Andrade Arruda; Modkovski, T. A.; Semião, M. A.; Brugnari, T.; Haminiuk, C. W. I.
Chemical and Biochemical Engineering Quarterly Vol. 35, No. 4, 2021
In this study, were used residual Açaí seeds as a biosorbent for two textile dyes (Acid Yellow 219 (AY) and Acid Red 361 (AR)), in single and binary solutions. Further, kinetic and isothermal studies were carried to evaluate if the chemical modifications in the Açaí seeds would promote an increase in biosorption. Kinetic assays for all solutions showed that more than 50 % of the dyes were removed in the first 15 minutes. The acid treatment of the biosorbent increased the removal of acid dyes in solution by 46 % and 32 %, respectively. In conc...
Hrčak ID: 271024
eng The Aerobic Biodegradation Kinetics of Plant Tannins in Industrial Wastewater
Tramsek, M.; Gorsek, A.; Glavic, P.
Chemical and Biochemical Engineering Quarterly Vol. 20, No. 3, 2006
This paper describes an experimental determination of the biodegradation rate for tannins present in industrial wastewater, after the extraction of chestnut chips. Experiments were performed in a laboratory aerobic reactor (Armfield) by using biomass from an existing industrial wastewater treatment plant. The outlet tannins concentration was determined under various processing conditions. Simultaneously, an optical microscope was used to monitor the mix of microbiological cultures in the biomass. On the basis of data obtained in experiments, no...
Hrčak ID: 4531
hrv Konkurentno uklanjanje teških metala iz binarne otopine
eng Competitive Heavy Metal Removal from Binary Solution
Bašić, Anita; Mužek, Mario Nikola; Kukoč-Modun, Lea; Svilović, Sandra
Kemija u industriji Vol. 69, No. 9-10 (special issue), 2020
Ispitano je uklanjanje iona bakra i kobalta iz binarnih otopina metala ionskom izmjenom na zeolitu NaX. Eksperimenti su provedeni u staklenom kotlastom reaktoru bez razbijala virova. Kao miješalo upotrijebljena je Rushtonova turbina. Ovisnost kinetike izmjene iona i izmijenjene količine iona metala ispitana je pri različitim početnim koncentracijama iona metala u smjesama. Prema dobivenim rezultatima, učinkovitost uklanjanja iona metala iz otopina ovisi o početnim koncentracijama metala u binarnim otopinama. Kinetički podatci dobiveni eksperime...
Hrčak ID: 243904
hrv Kinetički modeli za ekstrakciju uljarica superkritičnim CO2 - pregledni rad
eng Kinetic models for supercritical CO2 extraction of oilseeds - a review
Jokić, Stela; Nagy, B.; Velić, D.; Bucić-Kojić, Ana; Bilić, M.
Croatian journal of food science and technology Vol. 3, No. 2, 2011
Ekstrakcija uljarica superkritičnim fluidima u posljednjih nekoliko desetljeća nailazi na sve veće zanimanje u pogledu njene moguće komercijalne primjene. Razlog tome su brojne prednosti superkritične ekstrakcije, u odnosu na klasične ekstrakcijske postupke pomoću organskih otapala, kao i činjenicu da CO2, kao otapalo, ima oznaku GRAS te se smatra potpuno sigurnim za primjenu u proizvodnji i preradi hrane. Superkritična ekstrakcija, na industrijskoj razini, trenutno je usmjerena na dekofeinizaciju kave i čaja, ekstrakciju hmelja, proizvodnju se...
Hrčak ID: 76161
eng Adsorption of Reactive Dyes from Aqueous Solution Using Activated Carbon Prepared from Plantain Leaf Sheath Waste
G., Sangavi; Bakshi, Argho; G., Mathangi; G., Nandhini Devi
Chemical and Biochemical Engineering Quarterly Vol. 34, No. 3, 2020
All parts of the plantain are widely used in India for various purposes. But plantain leaf sheath always ends up as waste material which accumulates as a biowaste. The present study focuses on the preparation of activated carbon using phosphoric acid as activating agent, and its efficacy as an adsorbent for the removal of reactive dyes, Reactive Green 19, and Reactive Red 141. Batch adsorption studies have been conducted and optimum adsorption conditions were determined as a function of contact time, initial dye concentration, adsorbent dosage,...
Hrčak ID: 245606