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All Journal CHEMICA Jurnal Teknik Kimia Journal of Fibers and Polymer Composites
Lee Wah Lim
Gifu University
Chemical Engineering, Chemistry & Bioengineering Energy Materials Science & Nanotechnology

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Pembuatan Kolom Monolit Mixed-Mode untuk Pemisahan Fenol dalam Kromatografi Cair Sistem Kapiler Aster Rahayu; Joni Aldilla Fajri; Lee Wah Lim; Toyohide Takeuchi
CHEMICA: Jurnal Teknik Kimia Vol 5, No 2 (2018): Desember 2018
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (334.261 KB) | DOI: 10.26555/chemica.v5i2.12282

Abstract

A Mixed-Mode monolithic column prepared from Pentaeritrytol Tetraacrylate (PETRA) and Ethylene dimathacrylate (EDMA) was investigated and used in capillary liquid chromatography. The polymer composition was optimized by varying percentage ratio of monomer and porogens. Column A with rasio 35/65 (monomer/porogen) showed the optimum ratio. The polymerization of acrylic groups were conducted by in-situ preparation in capillary fused silica. Three phenol compounds were separated using this monolithic column using acetonitrile 100% as eluent. Monolith PETRA-EDMA also could work to separate polar and non-polar compound simultaneously by HILIC mode using acetonitrile 90% as eluent. The morphology surface of monolith was observed by scanning electron microscope (SEM) and mechanical stability in term of pressure drop was observed as well.
Cellulose Extraction from Coconut Coir with Alkaline Delignification Process Aster Rahayu; Farrah Fadhillah Hanum; Nafira Alfi Zaini Amrillah; Lee Wah Lim; Siti Salamah
Journal of Fibers and Polymer Composites Vol. 1 No. 2 (2022): Journal of Fibers and Polymer Composites
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (534.766 KB) | DOI: 10.55043/jfpc.v1i2.51

Abstract

Coconut has been known for its benefits in human life. Coconut coir, as part of coconut which is considered as waste, contains useful components. It contains high cellulose which is could be used in fiber industries. Meanwhile, coconut coir also contains lignin which needs to be separated. In this study, a delignification process was used to remove the brown color on the fiber caused by the lignin content. The delignification process was a pretreatment before the cellulose extraction was carried out. It had been done in the various NaOH concentration (0.5; 1; and 1.5 M), reaction time (1; 1.5; and 2 hours) and the reaction temperature (60,70, and 80 oC). This study aims to determine the cellulose content and the factor that affected the cellulose extraction and the characteristics of the cellulose extracted from the coconut coir. The Chesson Data method and SEM analysis have been used for the characterization of the cellulose. The delignification method known has the potential as a simple and effective method for extracting cellulose from natural materials. The result shows that the optimum cellulose content obtained at 100 mesh coir particle size, 1.5 M NaOH concentration, at 80°C for 1.5 hours was 69.82 %.
Co-Authors Farrah Fadhillah Hanum Joni Aldilla Fajri Nafira Alfi Zaini Amrillah Rahayu, Aster Soedjatmiko Toyohide Takeuchi