REDUCING THE CONTENT OF VOCS OF SOFTWOOD KRAFT LIGNINS FOR MATERIAL APPLICATIONS
Three laccases functioning in mild acidic and one in slightly alkaline (pH 8) conditions were evaluated in order to reduce small-molecular phenolic VOCs of kraft lignins, which could be used in lignin/natural fibers composites. The potential of a sulfhydryl oxidase to catalyze the oxidation of sulphur containing VOCs (thiols) was also tested in combination with the laccase catalyzed oxidation at pH 8. In addition, oxidation at alkaline pH at room temperature that may induce polymerization of phenolics in an analogous manner to the laccasecatalysed reaction was investigated. Enzyme reactivity towards lignins was evaluated as consumption of oxygen in the reaction solution. The effect of treatments on VOC reduction was determined both by sensing (odorimetry) and chemical (thermal desorption GC/MS, SEC) analyses. Laccases Lcc2 and MaL from Thielavia arenaria and Melanocarpus albomyces, respectively, showed potential in reducing odors. The most promising results were obtained by oxidizing lignin at alkaline pH. However, the odor threshold values of the main VOC compounds are extremely low, which poses a challenge to VOC reduction.
VOC kraft lignin laccase sulfhydryl oxidase composite
Anna Kalliola Anne Savolainen Taina Ohra-aho Greta Faccio Tarja Tamminen
VTT Technical Research Centre of Finland, VTT, P.O.Box 1000, FI-02044 VTT, Finland Trelleborg Industrial Products Finland Oy, Kikkerlantie 72, 38300 SASTAMALA, Finland
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
1102-1107
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）