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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°C 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, initial silver ion concentration 0.16 mol·L-1, 30°C and 36 h. © All Rights Reserved.
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CIESC Journal
ISSN: 0438-1157
CN: 11-1946/TQ
Year: 2013
Issue: 4
Volume: 64
Page: 1478-1484
Cited Count:
SCOPUS Cited Count: 6
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 3
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