Cr(III) removal by a microalgal isolate, Chlorella miniata: effects of nitrate, chloride and sulfate

Xu HanNora Fung Yee Tam


In the present study, nitrate, chloride and sulfate anion systems were used to investigate the presence of anions on the removal of Cr(III) by Chlorella miniata. Kinetic studies suggested that the equilibrium time of Cr(III) biosorption was not affected by the presence of different sodium salts, even at the concentration of 1.0 M, and all reached equilibrium after 24 h. Equilibrium experiments showed that the effects of different anions on Cr(III) biosorption varied, and the inhibitory order was SO4 (2-) > Cl(-) > NO3 (-). Langmuir isotherm indicated that the maximum sorption capacity of C. miniata increased with the increase of pH under different anion systems. The strongest inhibition effect of the sulfate system was attributed to the formation of Cr(OH)SO4 aq. and the decrease of Cr(OH)(2+) and Cr(3+) in solution, while the difference of inhibitory effect in the other two anion systems could be accounted by the formation of the inner-sphere surface complex in the nitrate system and the outer-sphere surface complex in the chloride system. The present study suggested that the presence of anions greatly affected the removal of Cr(III) on C. miniata and thereby their transport in the environment.


Jun 1, 1986·Canadian Journal of Microbiology·J T TrevorsG M Gadd
Aug 1, 1997·Regulatory Toxicology and Pharmacology : RTP·R A Anderson
Jul 1, 1999·Current Microbiology·P AhujaR K Saxena
May 20, 2000·Chemosphere·S Schiewer, M H Wong
Nov 23, 2001·Environmental Science & Technology·Y S YunB Volesky
May 19, 2005·Water Research·Vivian Diniz, Bohumil Volesky
Jul 19, 2005·Water Research·Roberto HerreroManuel E Sastre de Vicente
Apr 25, 2006·Water Research·Siripat SuteerapataranonKate Grudpan
Sep 12, 2006·Journal of Colloid and Interface Science·Xu HanNora Fung Yee Tam
Jan 2, 2007·Journal of Hazardous Materials·Xu HanNora Fung Yee Tam
Feb 20, 1989·Biotechnology and Bioengineering·N Kuyucak, B Volesky

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Aug 11, 2018·International Journal of Phytoremediation·Emilia NeagAndrada Măicăneanu

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