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Removal of indigo carmine by bacterial biogenic Mn oxides

Xiao Chen1, a, Yuanjun Pei2,b, Hui Wang2,c, Gejiao Wang2,d and Shuijiao Liao1,e,*
State Key Laboratory of Agricultural Microbiology,1College of Basic Sciences, 2College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
achenxiao460@126.com, bpeiyj1026@163.com, cbaimao.1986@163.com,
dgejiao@mail.hzau.edu.cn, eliaosj@mail.hzau.edu.cn, *Corresponding author

 

Indigo carmine (IC) is one of the oldest, most important and highly toxic dyes used and released in the effluents of many industries, such as textile, paper and plastics. Biogenic Mn oxides (BMO) were prepared by culturing Marinobacter sp. MnI7-9 in presence of Mn (II). The Point of Zero Charge (PZC) of the BMO is 7.5 by salt titration method. The surface area (BET) is 27.68 m2 g-1 by the nitrogen adsorption-desorption method. The adsorption kinetics of low concentration IC (5 mg L-1) on the BMO fit the pseudo-first order model, while the adsorption kinetics of higher concentration IC (20 mg L-1) fit the pseudo-second order model. Intra-particle diffusion is an important rate-controlling step. The equilibrium adsorption data fit well in the Langmuir isotherm equation. The maximal adsorption capacity is 115.61 mg g-1 at 25℃. A larger IC removal amount can be obtained when the amount of the BMO is 2 g L-1 at pH 6.5. These results suggest that the BMO can be used as an efficient material for IC removal from aqueous solution.



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