期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2017
卷号：8
期号：3
页码：884-893
出版社：University of Mohammed Premier Oujda
摘要：The ability of the diatom Navicula subminuscula (Manguin) to remove hexavalentchromium [Cr(VI)] was investigated in a batch system by the determination Cr(VI) toxiceffects and biosorption by this species. The experiments have been performed undervarying ranges of pH, contact time and initial ion concentrations. The results show asignificant growth of Navicula subminuscula for Cr concentrations up to 10mg L-1. Thegrowth rate decreases as a function of increasing concentrations of Cr(VI). The IC50 is9.2 mg L-1for the artificial growth medium tested which is more than that calculated withriver water (4.45mg L-1) and tannery effluent water (0.088mg L-1). The percentage ofCr(VI) biosorption increases with the decrease of pH: 50 % biosorption was measured atpH 7 whereas 92 % was reached at the extreme acid pH. The found linear plot of Ceq/qvs Ceq shows that biosorption follows the Langmuir biosorption model. The correlationcoefficient was 0.993. At an initial concentration of 0.4g dried diatoms per liter with aninitial Cr(VI) concentration of 20mg L-1, the values for qmax and b were determined fromthe slope and intercept of the plot, and were found to be 94.97mg Cr(VI) per g of diatomsand 0.16L mg-1, respectively. The wide ecological valence of this diatom to pollutionparameters and the seasonal pattern of its life cycle are the main factors that make thebiomonitoring of Cr(VI) by this species feasible.
