tailieunhanh - Magnetic chitosan nanoparticles for removal of Cr(VI) from aqueous solution

In this paper, magnetic chitosan nanoparticles were prepared, characterized and applied for the removal of Cr(VI) in the water solution. Afterwards, thermodynamic and kinetic aspects of the adsorption process were considered. The improved magnetic and high adsorption uptake properties are two main features of the synthesized nanoparticles that can be advantageously used in water treatment. | Materials Science and Engineering C 33 2013 1214 1218 Contents lists available at SciVerse ScienceDirect Materials Science and Engineering C journal homepage locate msec Magnetic chitosan nanoparticles for removal of Cr VI from aqueous solution Nguyen Ngoc Thinh a Pham Thi Bich Hanh b Le Thi Thanh Ha a Le Ngoc Anh c Tran Vinh Hoang a Vu Dinh Hoang a Le Hai Dang d Nguyen Van Khoi b Tran Dai Lam e a School of Chemical Engineering Hanoi University of Science and Technology 1 Dai Co Viet Road Hanoi Viet Nam b Institute of Chemistry Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road Hanoi Viet Nam c Institute of Marine Geology and Geophysics Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road Hanoi Viet Nam d Hanoi National University of Education 136 Xuan Thuy Hanoi Viet Nam e Institute of Materials Science Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road Hanoi Viet Nam a r t i c l e i n f o a b s t r a c t Article history A simple method was introduced to prepare magnetic chitosan nanoparticles by co-precipitation via epichlo- Received 28 April 2012 rohydrin cross-linking reaction. The average size of magnetic chitosan nanoparticles is estimated at ca. Received in revised form 29 August 2012 30 nm. It was found that the adsorption of Cr VI was highly pH-dependent and its kinetics follows the Accepted 3 December 2012 pseudo-second-order model. Maximum adsorption capacity at pH 3 room temperature was calculated as Available online 9 December 2012 mg g 1 according to Langmuir isotherm model. The nanoparticles were thoroughly characterized be- Keywords fore and after Cr VI adsorption. From this result it can be suggested that magnetic chitosan nanoparticles Fe3O4 could serve as a promising adsorbent for Cr VI in wastewater treatment technology. Magnetic chitosan nanoparticles 2012 Elsevier . All rights reserved. Adsorption isotherm Cr VI 1. Introduction adsorption rate and available capacity. .

• Môi trường
• Magnetic chitosan nanoparticles
• Adsorption isotherm
• Aqueous solution
• Water treatment
• Adsorption experiments
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