Pressure relief-dipping-microwave assisted polymerization of melamine-L-aspartic acid resin at activated carbon for purification of L-threonine fermented crude product  

作　　者：Bin Li Wenshuai Tang Aiguo Yuan Guanping Jin 

机构地区：[1]Anhui Key Lab of Controllable Chemical Reaction &Material Chemical Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China [2]Shantou CityJiahe Biologic Technology Co. Ltd., Shantou 515021, China

出　　处：《Chinese Journal of Chemical Engineering》2018年第10期2034-2039,共6页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(U1407110);2014 Special Funds of Guangdong Province for Collaborative Innovation and Environment Platform Construction,Public Research and Capacity Building(2014B090901010)

摘　　要：L-threonine(L-Thr) obtained by fermentation often contains vestigial hydrosoluble Pb(Ⅱ), Fe(Ⅱ), L-glutamic acid(L-Glu) etc., which affect the product quality. Poly melamine and L-aspartic acid(L-Asp) resin functional coconut shell activated carbon composite(PMA/AC) was prepared by a pressure relief-dipping-microwave assisted polymerization method for the simultaneous removals. The adsorption capacities of Pb(Ⅱ), Fe(Ⅱ) and L-Glu could reach to 82.34 mg·g^(-1), 57.82 mg·g^(-1) and 102.58 mg·g^(-1) at conditions of pH 5.0, 45 °C and 4 h with an initial concentration of 0.01 mol·L^(-1), respectively. The present PMA/AC was successfully used to the simultaneous removals of vestigial Pb(Ⅱ), Fe(Ⅱ) and L-Glu from the fermented crude product solution of L-Thr. Moreover, the PMA/AC was carefully characterized by FE-SEM, IR et al. analysis techniques, the results show that abundant PMA particles evenly distributed at the inner and outside surface of AC with a size of(50 ± 20) nm.L-threonine（L-Thr） obtained by fermentation often contains vestigial hydrosoluble Pb（Ⅱ）, Fe（Ⅱ）, L-glutamic acid（L-Glu） etc., which affect the product quality. Poly melamine and L-aspartic acid（L-Asp） resin functional coconut shell activated carbon composite（PMA/AC） was prepared by a pressure relief-dipping-microwave assisted polymerization method for the simultaneous removals. The adsorption capacities of Pb（Ⅱ）, Fe（Ⅱ） and L-Glu could reach to 82.34 mg·g-1, 57.82 mg·g-1 and 102.58 mg·g-1 at conditions of pH 5.0, 45 °C and 4 h with an initial concentration of 0.01 mol·L-1, respectively. The present PMA/AC was successfully used to the simultaneous removals of vestigial Pb（Ⅱ）, Fe（Ⅱ） and L-Glu from the fermented crude product solution of L-Thr. Moreover, the PMA/AC was carefully characterized by FE-SEM, IR et al. analysis techniques, the results show that abundant PMA particles evenly distributed at the inner and outside surface of AC with a size of（50 ± 20） nm.

关 键 词：L-Threonine fermented crude product Simultaneous removals Activated carbon composites Absorption 

分 类 号：TQ922[轻工技术与工程—发酵工程]