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Continuous Degradation of azo dye by Immobilized laccase  

Kwon, Sin (School of Chemical Engineering & Technology, Yeungnam University)
Ryu, Won-Ryul (School of Chemical Engineering & Technology, Yeungnam University)
Cho, Moo-Hwan (School of Chemical Engineering & Technology, Yeungnam University)
Publication Information
KSBB Journal / v.17, no.2, 2002 , pp. 189-194 More about this Journal
Abstract
Laccase produced from Trametes sp. was immobilized on CNBr-activated Sepharose-4B (CAS4B) and tested for degradation of azo dyes. Laccase was efficiently immobilized on CAS4B. Immobilization of laccase on CAS4B increased pH, thermal and proteolytic stabilities. Optimum pH and temperature of immobilized laccase were pH 3 and 40$\^{C}$, respectively as same as those of free laccase. The K$\_$m/($\mu$mol/ml) values of free and immobilized laccase for Reactive Blue 19 as the substrate were 0.34 and 2.07, respectively V$\_$max/($\mu$mol/mL$.$min) values of them were 0.12 and 0.1, respectively. In repeated batch reactions, conditions retained high stability and degradation of dye for immobilized laccase were pH 5 and 30$\^{C}$. HBT didn\\`t decrease highly activity of immobilized laccase. Immobilized laccase was very stable for degrading dyes continuously in a packed-bed reactor containing laccase immobilized on CAS4B. For continuous degradation of 100 $\mu$M Reactive Blue 19 and 50 $\mu$M Acid Red 57 in the presence of 0.1 mM HBT under optimum conditions, immobilized laccase retained 70% of degradation ability even after 30 hours.
Keywords
laccase, immobilization; CNBr-activated Sepharose-4B; azo dyes;
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