Effect of modified coal through chemical activation process on performance of heterogeneous reverse osmosis membranes

• Autorzy: Thaçi B. , Gashi S. , Daci N. , Daci M. , Dylhasi A.

Identyfikatory

DOI

10.5277/epe150105

• Języki publikacji: EN

Abstrakty

EN

Heterogeneous reverse osmosis (RO) membranes have been prepared from cellulose acetate (CA) and modified coal through chemical activation. Nitric acid of various concentrations, sulfuric and acetic acids used for various time periods have been studied with respect to modification of structure of coal and consequently structure of RO membranes. The effect of these variables on the modification of coal was examined by IR spectroscopy. All membranes prepared in such a way showed improved performance in comparison with standard CA membranes. The volume flux of the best RO membranes at 94% level of solute separation was 3.87×10–2 m3/(m2·h) at 1.76 MPa using aqueous feed solution 400 mg/dm3 of sodium chloride. The performance improvement was related to increases of charge of groups of coal particles in the membrane, affecting their rheology and morphology resulting in better membrane productivity. The SEM of some membranes have also been presented. These membranes were tested also with 1:1, 1:2, 2:2 and 1:3 inorganic salt solutions. The agreement between the calculated and experimental data of solute separation for studied solutes was reasonably good.

Słowa kluczowe

EN

chemical activation; coal; membranes; reverse osmosis; wastewater treatment; reverse osmosis treatment

PL

aktywacja chemiczna; węgiel; membrany; odwrócona osmoza; oczyszczanie ścieków przemysłowych

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Environment Protection Engineering
• Rocznik: 2015
• Tom: Vol. 41, nr 1
• Strony: 53--65
• Opis fizyczny: Bibliogr. 19 poz., tab., rys.

Twórcy

autor

Thaçi B.

• Department of Chemistry, Faculty of Natural Sciences, University of Prishtina, Rr. Nëna Tereze 5, 10 000 Prishtinë, Republic of Kosova

autor

Gashi S.

• Department of Chemistry, Faculty of Natural Sciences, University of Prishtina, Rr. Nëna Tereze 5, 10 000 Prishtinë, Republic of Kosova

autor

Daci N.

• Department of Chemistry, Faculty of Natural Sciences, University of Prishtina, Rr. Nëna Tereze 5, 10 000 Prishtinë, Republic of Kosova

autor

Daci M.

• Department of Chemistry, Faculty of Natural Sciences, University of Prishtina, Rr. Nëna Tereze 5, 10 000 Prishtinë, Republic of Kosova

autor

Dylhasi A.

• Department of Chemistry, Faculty of Natural Sciences, University of Prishtina, Rr. Nëna Tereze 5, 10 000 Prishtinë, Republic of Kosova

Bibliografia

• [1] DICKINSON J.M., Fundamental aspects of reverse osmosis, [in:] Reverse osmosis technology, S. Bipin, M. Parekh (Eds.), Marcel Dekker, Inc., New York 1988.
• [2] KUCERA J., Reverse osmosis, industrial applications and processes, Wiley, New York 2010.
• [3] SOURIRAJAN S., MATSUURA T., Reverse osmosis/ultrafiltration process principles, National Research Council Canada, Ottawa 1985.
• [4] BUNGAY P.M., LONSDALE H.K., DE PINHO M.N., Synthetic membranes. Science, engineering and applications, D. Reidel Pubishing Company, Dordrecht 1986.
• [5] GASHI S.T., DACI N.M., SELIMI T., BERISHA S., Preparation and properties of cellulose acetate coal heterogeneous reverse osmosis membranes, Environ. Prot. Eng., 2000, 26, 29.
• [6] KUNST B., SOURIRAJAN S., Development and performance of some porous cellulose acetate membranes for reverse osmosis desalination, J. Appl. Polym. Sci., 1970, 14, 2559.
• [7] KASTELAN-KUNST L., DANANIC V., KUNST B., KOSUTIC K., Preparation and porosity of cellulose tri acetate reverse osmosis membranes, J. Membrane Sci., 1996, 109, 223.
• [8] GASHI S.T., DACI N.M., PODVOTICA F., SELIMI T., THAÇI B., Effect of the modification time of coal with aryldiazonium salts on performance of cellulose acetate-coal heterogeneous reverse osmosis membranes, Desalination, 2009, 240, 1.
• [9] GASHI S.T., SELIMI T., THAÇI B., DYLHASI A., Optimization of heterogeneous RO membrane preparation, Water Sci. Techn., 2011, 11 (6), 647.
• [10] PILON R., KUNST B., SOURIRAJAN S., Studies on the development of improved reverse osmosis membranes from cellulose acetate-acetone-formamide casting solutions, J. Appl. Polym. Sci., 1971, 15 (6), 1317.
• [11] AHMADPOUR A., DO D.D., The preparation of active carbons from coal by chemical and physical activation, Carbon, 1996, 34, 471.
• [12] FRYSZ C.A., CHUNG D.D.L., Improving the electrochemical behavior of carbon black and carbon filaments by oxidation, Carbon, 1997, 35 (8), 1111.
• [13] KINOSHITA K., Carbon Electrochemical and Physicochemical Properties, Wiley and Sons, New York 1988.
• [14] TOUPLIN M., BELANGER D., Thermal stability study of aryl modified carbon black by in situ generated diazonium, J. Phys. Chem., 2007, 111, 5394.
• [15] YILDIRIM M., OZBAYOGLU G., Production of ammonium nitrohumate from Elbistan lignite and its use as a coal binder, Fuel, 1997, 76, 385.
• [16] ALVAREZ R., CLEMENTE C., GOMEZ-LIMON D., The influence of oxidative chemical preparation on low rank coal and its impact on coal structure, Fuel, 2003, 82, 2007.
• [17] FONG S.S., SENG L., MAT B.H., Reuse of nitric acid in the oxidative pretreatment step for preparation of humic acids from low rank coal of Mukah, Sarawak, J. Braz. Chem. Soc., 2007, 18 (1), 41.
• [18] MATSUURA T., PAGEAU L., SOURIRAJAN S., Reverse osmosis separation of inorganic solutes in aqueous solutions using porous cellulose acetate membranes, J. Appl. Polym. Sci. 1975, 19, 179.
• [19] RANGARAJAN R., MATSURA T., GOODHUE E.C., SOURIRAJAN S., Free energy parameters for reverse osmosis separations of some inorganic ions and ion pairs in aqueous solutions, Ind. Eng. Chem. Process Des. Dev., 1976, 15 (4), 529.