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Preparation and Characteristic of Chitosan and CS/ GO Porous Materials

Author: WuXinHua
Tutor: LiuYuï¼›GaoJianPing
School: Tianjin University
Course: Analytical Chemistry
Keywords: chitosan graphite oxide adsorption xylenol orange heavy metal ions porous materials
CLC: TQ281
Type: Master's thesis
Year: 2009
Downloads: 92
Quote: 0
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Abstract


Recently, large amount of heavy metal ions and organics was produced following with the development of the industrial production. Correspondingly, many kinds of wastewater treatment technology emerge. Among them, the adsorption separation technology gets a great development and displays a wide application prospect. So, developing an adsorption material with high efficiency, cheap and nontoxic for wastewater treatment is feasible.Chitosan displays many special properties. For example, it has lots of amino and hydroxyl on the chitosan molecule which can complex with the metal ions or be used for flocculation. The chitosan is a abundant natural resource, and approved to be an ideal adsorption material. In this article, we use the unidirectional freeze-drying method to prepare the chitosan porous material, and then analysis the structure and the morphology of the chitosan porous materials by the method of IR and SEM. In order to increase the porosity and the specific surface area of the chitosan porous material, ethyl acetate is added to the chitosan solution before it is frozen. While, for strengthening the mechanical property of the porous material, the graphite oxide is added to the chitosan solution before it is frozen. Meanwhile, the absorbing ability of the porous materials for the metallic ions (Cu2+) and dye (XO) was investigated and some factors such as amount, pH, time, amount of crosslingking agent et al for absorbing ability were confirmed.The results appeared that the porosity of the porous material increases after ethyl acetate was added, and the GO can strength the mechanical property of the porous material in wet state. The chitosan porous material has a good absorption to the XO and Cu2+. The temperature and the pH are the main factors for controlling the adsorption ability of the chitosan to XO and Cu2+. Since the CS/GO composite is stable and can keep the initial form, it will be a potential absorbing material in waste water treatment.

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