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eng Removal of acetaldehyde form indoor air using NaA zeolite and Modernite
Stevanović, Kika; Kešelj, Dragana; Škundrić, Branko; Lazić, Dragica; Petrović, Zoran
Technologica Acta Vol. 14, No. 2, 2021
Indoor pollution nowadays can have serious effects on people’s health. The most common indoor pollutants in urban and industrial areas are volatile organic compounds – VOCs, which include acetaldehyde. Acetaldehyde vapors cause eye irritation, lung or respiratory tract problems and are considered cancerogenic. The aim of this research was to examine the adsorption properties of type NaA zeolite and Na-Form of modernite. Adsorption isotherms of acetaldehyde on the examined adsorbents were obtained by simulating adsorption in an indoor environmen...
Hrčak ID: 274175

eng Studies on the Adsorption of 2-Chlorophenol onto Rice Straw Activated Carbon from Aqueous Solution and its Regeneration
Mahapatra, M. K.; Kumar, A.
For this study a low-cost adsorbent, rice straw activated carbon (RSAC) was prepared via thermochemical routes after being impregnated with ZnCl2. Characterization studies performed on RSAC have revealed that RSAC is a mesoporous adsorbent with significant affinity towards 2-chlorophenol (2-CP). The optimal values for process parameters were investigated via experimental runs. The optimal values of process parameters such as RSAC dose, pH of 2-CP solution, contact time, and temperature were found to be; 1.25 g L–1, 8, 125 min, and 303 K, resp...
Hrčak ID: 275199

eng Interactions of Phenolic Acids and β-Glucan: Studies of Adsorption Isotherms and Thermodynamics
Matić, P.; Ukić, Š.; Jakobek, L.
Interactions between polyphenols and dietary fiber might play an important role in polyphenol bioactivities. These interactions can be studied through adsorption processes. The aim of this study was to investigate the adsorption of phenolic acids (p-coumaric acid, caffeic acid, chlorogenic acid) onto dietary fiber – β-glucan. Adsorption was carried out at different temperatures (25, 37, and 45 °C) and pH values (1.5, 5.5, and 10). Non-linear isotherm adsorption models (Langmuir, Freundlich, Dubinin-Radushkevich, Temkin, Hill) were applied to an...
Hrčak ID: 261166

eng Sucrose fatty esters from underutilized seed oil of Terminalia catappa as potential steel corrosion inhibitor in acidic medium
Adewuyi, Adewale; Bello, Omolade Rahman; Oderinde, Rotimi A.
Corrosion of metals is a common problem which requires definite attention. In response to this, the oil was extracted from the seed of Terminalia catappa and used to synthesize sucrose fatty esters via simple reaction mechanism which was considered eco-friendly and sustainable. The corrosion inhibition capacity of sucrose fatty esters for mild steel in 1 M HCl was studied using the weight loss method. It was shown that sucrose fatty ester inhibited corrosion process of mild steel and obeyed Langmuir isotherm. Corrosion rate and inhibition effic...
Hrčak ID: 171579

eng Comparison of Analytical and Numerical Models of Adsorber/desorber of Silica Gel-water Adsorption Heat Pump
Zwarycz-Makles, Katarzyna; Szaflik, Wladyslaw
In the paper, comparison of an analytical and a numerical model of silica gel/water adsorber/desorber is presented. Adsorber/desorber as a part of the two-bed single-stage adsorption heat pump is discussed. The adsorption heat pump under consideration consists of an evaporator, two adsorber/desorber columns and a condenser. Only heat and mass transfer was taken into account during operation of assumed adsorption heat pump. Adsorption equilibrium was described by the Dubinin-Astachov model. The presented mathematical models, both analytical and...
Hrčak ID: 170111

eng Modeling and Simulation for Pressure Swing Adsorption System for Hydrogen Purification
Biswas, P.; Agrawal, S.; Sinha, S.
Pressure swing adsorption (PSA) is a very versatile technology for separation and purification of gas mixtures. Its key industrial application is the production of high purity (99.999 + %) hydrogen. For this, it utilizes different loading capacities of adsorbent at different pressures. Despite tremendous growth in practical applications of this technology, the design of PSA system is more of an experimental basis. The realistic model of a PSA cycle consists of flow rate which varies due to significant adsorption, while the heat effect needs al...
Hrčak ID: 62710

eng Adsorption of Tetramethylthiourea in the Presence of Cationic Detergent at Interface Electrode / Aqueous Perchlorate Solutions
Klin, Małgorzata; Nieszporek, Jolanta; Sieńko, Dorota; Gugała-Fekner, Dorota; Saba, Jadwiga
Croatica Chemica Acta Vol. 84, No. 4, 2011
The mixed adsorption layers of tetramethylthiourea and a cationic detergent formed at electrode surface in NaClO<sub>4</sub> (1 mol dm<sup>–3</sup>) are described. The systems were characterized by the measurement of differential capacity, zero charge potential, and surface tension at this potential. The data were analyzed to obtain the surface pressure and relative surface excess of tetramethylthoiurea as a function of electrode charge at bulk concentration of studied compounds. It was stated that the adsorbing tetramethylthoiurea molecul...
Hrčak ID: 75055

eng Theoretical Description of Calorimetric Effects of Proton Adsorption on Metal Oxides from Electrolyte Solutions Based on 1-pK and 2-pK Surface Protonation Models
Rudziński, Władysław; Piasecki, Wojciech
Croatica Chemica Acta Vol. 76, No. 4, 2003
A rigorous thermodynamic description of ion adsorption on metal (hydr)oxide/electrolyte solution interface, including calorimetric effects, is given. Temperature dependence of potentiometric titration curves for suspensions, the heat (enthalpy) of proton adsorption, and the influence of surface potential on calculated quantities are analyzed. The calculations were based on the 1-pK Basic Stern Model (BSM) and the 2-pK Triple Layer Model (TLM) of the oxide/electrolyte interface. Comparison of the results obtained by means of these two models wit...
Hrčak ID: 103188

eng Analysis of Modified Starch Adsorption Kinetics on Cellulose Fibers via the Modified Langmuir Adsorption Theory
Zakrajšek, N.; Knez, S.; Ravnjak, D.; Golob, J.
The kinetics of starch adsorption on cellulose fibers is one of the most important criteria regarding the efficient application of papermaking additives due to the continuous nature of paper production and the concomitant need to determine optimum residence times. This study presents an analysis of the kinetics of modified starch adsorption onto cellulose fibers via the application of the modified Langmuir adsorption theory (i.e. the collision theory). A model based on this theory was used to describe the kinetics of starch binding, and to obt...
Hrčak ID: 45407

eng Application of the adsorbent CR-100 for Ammonium Removal: Thermodynamic and Kinetic Studies
Kiralj, Arpad; Tomić, Željko; Hadnadjev-Kostic, Milica; Lukić, Nataša; Vulić, Tatjana; Grahovac, Jovana; Jokić, Aleksandar
Croatica Chemica Acta Vol. 94, No. 4, 2021
Groundwater with increased ammonia concentration is a constant concern regarding the preparation of drinking water. The affinity of ammonia to be adsorbed on the surface of different solid materials significantly influences the selection of its removal process and has been the motivation for this investigation. Crystal-Right™ (CR-100) was used for the removal of ammonia from aqueous solution in batch adsorption procedure. The kinetics of adsorption followed the pseudo-second-order model. The Elovich model suggested that chemisorption rate decre...
Hrčak ID: 281133