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℃ 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.