University of Tehran/Springer International Journal of Environmental Research 1735-6865 7 2 2013 04 01 As(III) and As(V) Sorption on MnO2 Synthesized by Mechano-chemical Reaction from Aqueous phase 395 402 618 10.22059/ijer.2013.618 EN I. Andjelkovic Innovation center of the Faculty of Chemistry, Studentski Trg 12-16, P.O. Box 51, 11158 Belgrade 118 Serbia D. Manojlovic Faculty of Chemistry, Studentski Trg 12-16, Belgrade, Serbia S. Skrivanj Faculty of Chemistry, Studentski Trg 12-16, Belgrade, Serbia B.M. Pavlovic Faculty of Electrical Engineering, B. Kralja Aleksandra 73, Belgrade, Serbia N.R. Amaizah Faculty of Chemistry, Studentski Trg 12-16, Belgrade, Serbia G. Roglic Faculty of Chemistry, Studentski Trg 12-16, Belgrade, Serbia Journal Article 2013 03 10 Nanoparticles of manganese-dioxide synthesized by mechano-chemical reaction were used for<br />As(III) and As(V) sorption from water environment. The influence of a milling time of manganese-dioxide on sorption was examined with batch procedure. Sorption as a function of contact time was investigated. Kinetic of sorption, for both As(III) and As(V), was fast. The equilibrium condition for milled sorbents was achieved after one hour of mixing. Experimental data were fitted to Freundlich and Langmuir adsorption models. Both models represent experimental data well with slightly better regression coefficient for Freundlich isotherm model. With the increase of the milling time manganese-dioxide adsorption capacity for As(III) and As(V) increased. The decrease of average particle size with milling could be responsible for increase of sorption capacity. The influence of pH on sorption was also investigated. The sorption of both, As(III) and As(V), in investigated pH range (6.0-9.0) was not significantly disturbed and showed similar behaviour, what could indirectly imply oxidation of As(III) to As(V) before sorption. https://ijer.ut.ac.ir/article_618_eb6fdc36b281b7d5eabf33396c2683a2.pdf