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Fenghong Huang,Renmin Gong,Na Li,Shoujun Ni,Pingzhen Guo 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.5
An ion exchanger with carboxyl groups as active sites was prepared by activating sawdust with epichlorohydrin,followed by coupling the epoxy-activated sawdust with aspartic acid. The optimal sorption condition, sorption capacity, kinetics and thermodynamics of basic dyes on sawdust ion exchanger (SIE) from aqueous solution were investigated in a batch system. Two basic dyes, methylene blue (MB) and crystal violet (CV), were selected as sorbates. The optimal pH value of MB and CV solutions for favorable sorption was pH 4 and above. The removal ratios of MB and CV on SIE increased with increasing sorbent dose but decreased with increasing dye concentration. The isothermal data of MB and CV sorbed on SIE correlated basically with the Langmuir model. The maximum sorption capacity (Qm) of SIE for MB and CV was 222.22 and 232.56 mg/g, respectively. The sorption equilibriums of MB and CV on SIE were reached at about 9 h, and the sorption processes could be described by the pseudo-second-order kinetic model. The thermodynamic study indicated that the sorptions of MB and CV on SIE were spontaneous and endothermic at the predetermined temperatures. High temperatures were favorable for the sorption processes.
Zhang Yan,Liang Zhuo,Jiang Mulan,Wan Xia,Gon Yangmin,Zhang Yinbo,Huang Fenghong 한국식품과학회 2013 Food Science and Biotechnology Vol.22 No.2
In modern diet of human being, the ω-6/ω-3ratio of dietary fatty acid was shifted much towards ω-6series. In this work, a fatty acid desaturase (FAD) gene lkfad15 was cloned and identified from oleaginous yeast Lipomyces kononenkoae. Function analysis results shown that LKFAD15 is a novel Δ12/Δ15 bifunctional FAD which could not only produce linoleic acid and α-linolenic acid use just oleic acid as substrate but also adjust the ω-6/ω-3 fatty acids ratio to the WHO recommended ratio. Phylogenetic analysis of LKFAD15 suggested it is a specific intermediate product of gene evolution derives from independent gene duplication events.