WANG Wendong, ZHANG Jianwei, ZHENG Jifeng, et al. Preparation of melamine-modified lignin and its adsorption performance for silver ion[J]. CIESC Journal, 2013, (4): 1478-1484.
WANG Wendong, ZHANG Jianwei, ZHENG Jifeng, et al. Preparation of melamine-modified lignin and its adsorption performance for silver ion[J]. CIESC Journal, 2013, (4): 1478-1484.DOI: 10.3969/j.issn.0438-1157.2013.04.049.
Melamine-modified lignin (MEHL) was prepared using grafting reaction from hydrolyzed lignin (EHL) by enzyme
melamine and formaldehyde
and its adsorption for silver ions was studied.The results from grafting reaction showed that content of melamine and formaldehyde had great influences on MEHL yield.High yield 83.7% for MEHL was achieved with EHL:melamine:formaldehyde mass ratio 10:6:6 at reaction temperature 90℃ and reaction time 4 h.The MEHL obtained was characterized by FTIR
TGA and elemental analysis.The results showed that melamine molecules had been grafted onto EHL chains.Nitrogen content in MEHL had obvious increase from original 0.81% to 18.55%.Furthermore
the adsorption performance for silver ions at the same conditions was much stronger for MEHL than for EHL.Its maximum adsorption capacity was up to 944.1 mg·g-1 at optimal conditions:50 mg MEHL