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	Production of a bioflocculant by Aspergillus parasiticus and its application in dye removal
	Deng, SB ; Yu, G ; Ting, YP
	2010-05-10 ; 2010-05-10
关键词	Aspergillus parasiticus flocculation performance bioflocculant dye removal XPS and FTIR MICROBIAL CELL FLOCCULANT RHODOCOCCUS-ERYTHROPOLIS BIOPOLYMER FLOCCULANT SOJAE AJ7002 PURIFICATION Biophysics Chemistry, Physical Materials Science, Biomaterials
中文摘要	Aspergillus parasiticus was found to produce a bioflocculant with high flocculating activity for Kaolin suspension and water-soluble dyes. Results showed that the carbon and nitrogen sources favorable for the production of the bioflocculant were corn starch and peptone, and an optimal condition of 28 degrees C, initial pH 5-6 and shaking speed of 150 rpm. The highest flocculating efficiency achieved for Kaolin suspension was 98. 1 %, after 72 h cultivation. The bioflocculant was mainly composed of sugar (76.3%) and protein (21.6%), and an average molecular weight of 3.2 x 10(5) Da. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectra showed that amino, amide and hydroxyl groups were present in the bioflocculant molecules. The bioflocculant was effective in flocculating some soluble anionic dyes in aqueous solution, in particular Reactive Blue 4 and Acid Yellow 25 with a decolorization efficiency of 92.4 and 92.9%, respectively. The decolorization efficiency was dependent on the flocculant dosage and solution pH. XPS result shows that the amine groups in the bioflocculant were protonated at pH 5, and thus the positive bioflocculant was attracted to the negatively charged dye molecules. The amino and amide groups in the bioflocculant molecule are believed to play an important role in flocculation from the viewpoint of electrostatic interaction. (c) 2005 Elsevier B.V. All rights reserved.
语种	英语 ; 英语
出版者	ELSEVIER SCIENCE BV ; AMSTERDAM ; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/23507]
专题	清华大学
推荐引用方式 GB/T 7714	Deng, SB,Yu, G,Ting, YP. Production of a bioflocculant by Aspergillus parasiticus and its application in dye removal[J],2010, 2010.
APA	Deng, SB,Yu, G,&Ting, YP.(2010).Production of a bioflocculant by Aspergillus parasiticus and its application in dye removal..
MLA	Deng, SB,et al."Production of a bioflocculant by Aspergillus parasiticus and its application in dye removal".(2010).

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