การใช้วัสดุเชิงประกอบไคโตซาน/ไททาเนียเป็นตัวดูดซับสีย้อมรีแอกทีฟ

• Main Author: ปรางศิริ มณีนวล
• Other Authors: สิริวรรณ กิตติเนาวรัตน์
• Format: Theses and Dissertations
• Language: Thai
• Published: จุฬาลงกรณ์มหาวิทยาลัย 2013
• Subjects: วัสดุเชิงประกอบ; ไคโตแซน; Composite materials; Chitosan
• Online Access: https://digiverse.chula.ac.th/Info/item/dc:34508
• Institution: Chulalongkorn University

This study was to investigate the dye adsorption ability for removal of the reactive red 35 dye of three different adsorbent beads consisting of pure chitosan and two different chitosan/titania composite beads. Titania used for preparing the chitosan/titania composite beads was obtained from the sol-gel method or from the commercial titania powder A100. According to the results of dye adsorption abilities of three different adsorbents, it could be concluded that the chitosan/titania composite beads containing commercial titania powder had the adsorption abilities for removal of the reactive red dye solution up to 97%, which was much better than that of the chitosan/titania composite beads containing titania obtained from the sol-gel method which had the adsorption abilities around 77%. This was because the commercial titania powder contained in the chitosan/titania composite beads showed higher content of crystalline anatase than that of titania obtained from the sol-gel method in the composite beads. The crystallinity of anatase enhanced the dye adsorption ability of the composite beads. Pure chitosan adsorbent showed a good dye adsorption ability up to 95% due to the electrostatic interactions between chitosan and the reactive red dye. It was also found that three different adsordent beads could be reused for the second time. However, the re-adsorption ability of each adsorbent bead was less than the first one. From the result of adsorption isotherms, it could be concluded that the adsorption isotherm of pure chitosan beads or chitosan/titania composite beads containing titania obtained from the sol-gel method followed both Langmuir and Freundlich models. While the adsorption isotherm of chitosan/titania composites beads containing commercial titania tended to follow Freundlich model.