Recovery and use of secondary fiber for paper production is increasing all over the word. In recovered paper recycling, stickies are the most detrimental among the contaminants, affecting both the process efficiency and the quality of the final product. In this study, StickAway enzyme was used to treat the old newspaper(ONP) pulps. The effect of enzymatic treatment on the macro and micro-stickies, the drainage property, as well as the formation of paper products were investigated. After treatment of samples with 3LU/g (o.d pulp) doses of enzymatic for 1.5 h, it was found that 14.6% of the micro-stickies could be removed. The cationic demand, turbidity value and particle size were decreased 7.23%, 14.4% and 6.02% respectively compared the control sample. Furthermore, enzymatic treatment also improved the drainage properties of pulp slurry and the formation of paper products. Results confirmed that under the optimal conditions, the StickAway enzyme show the excellent performance in the treatment of the stickies of recovered pulps.
Heterogeneous method for grafting of syringaldehyde (SD) onto chitosan by laccase oxidation, yielding a product with improved antioxidant activities. The results showed that about 1.1% amino groups participated in this reaction. The FTIR showed that the absorption of amino groups were decreased, the absorption of benzene ring structures were disappeared and a new band appeared at 1637 cm-1 corresponding to C=N vibrations that were due to the Schiff base reaction between the chitosan and syringaldehyde. Additionally, the chitosan had insignificant reducing power and DPPH free radical scavenging activity, SD-chitosan had reducing power of A700=0.684, DPPH free radical scavenging activity of 53.2%. SD-chitosan presented improved antioxidant properties.
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