Authors:
Noni Oktari
1
;
Saharman Gea
2
;
Andriayani
2
;
Sri Rahayu
1
;
Reka Mustika Sari
1
and
Khatarina Meldawati Pasaribu
1
Affiliations:
1
Postgraduate Chemistry Study Program, Universitas Sumatera Utara, Jalan Bioteknologi Padang Bulan
;
2
Department of Chemistry, Universitas Sumatera Utara, Jalan Bioteknologi Padang Bulan, Medan, Indonesia
Keyword(s):
Cellulase, Deinking, Laccase, Old Newspaper
Abstract:
The utilization of enzyme in deinking process of recycle paper is still in development phase since it was known that conventional deinking use large amount of chemicals such as sodium hydroxide, sodium silicate, and hydrogen peroxide which are environmentally damaging. In the present study, cellulase combined with laccase was used for deinking process of old newspaper pulp. The first step was repulping the old newspaper, and then the pulp slurry at 10% consistensy was treated with cellulase and laccase with different concentration from 0-2%. After washing process, the pulp was reforming in to the handsheet. The tensile strength of the handsheet was tested and the morphological changes was analyzed using scanning electron microscopy (SEM). The result showed that handsheet treated with 1% cellulase and 1% laccase had the highest tensile strength (2.1 MPa) with 1493 MPa Young’s modulus. From the images of SEM, showed that fiber surface pulp turned rough and microfibril also appeared on
the fiber surface after enzymatic treatment with cellulase and laccase, which indicated delignification process and facilitated the release of ink particle entrapped.
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