SINTESIS DAN KARAKTERISASI KOMPOSIT KITOSAN-ZEOLIT SEBAGAI SISTEM LEPAS LAMBAT SENG(II)
Preparation of chitosan/zeolite/Zn composites were carried out by mixing chitosan gel with zeolite particle and zinc(II) solution. The objective is to study the effect of zeolite and chitosan composition in the composite to the release behaviour of zinc(II) ion. Composite beads were formed by drippi...
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| Main Authors: | , |
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| Format: | Theses and Dissertations NonPeerReviewed |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2014
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| Subjects: | |
| Online Access: | https://repository.ugm.ac.id/130399/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=70820 |
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| Institution: | Universitas Gadjah Mada |
| Summary: | Preparation of chitosan/zeolite/Zn composites were carried out by mixing
chitosan gel with zeolite particle and zinc(II) solution. The objective is to study
the effect of zeolite and chitosan composition in the composite to the release
behaviour of zinc(II) ion. Composite beads were formed by dripping dropwise the
mixture into a solution of sodium hydroxide. The composites were then analysed
further for its crystallinity and surface morphology using X-Ray diffraction
(XRD) and Scanning Electron Microscope (SEM) respectively. The release of
Zn(II) from the system was also tested by soaking the composites in citric acid
solution for 2 hours. Dissolved Zn(II) was then analyzed by using Atomic
Absorption Spectroscope (AAS).
Typical diffraction peaks of ZnO with wurtzite allotrope appeared in the
diffractograms of chitosan-Zn. However the same peak was not detected in the
diffractograms of the composites and zeolite-Zn. The SEM images confirmed the
existence of wurtzite ZnO between chitosan network. The composites� surface
morphology was also found to get smoother by further chitosan addition. In the
other hand, the composite with a high zeolite composition showed a rougher
morphology. The kinetic model indicates that the release of Zn(II) from the
composite follows the first-order equation. The composites� release behavior was
tested by releasing zinc in citric acid solution. The result showed that zinc(II) ions
were released slowly from composites with high zeolite content, while zinc(II)
was released rapidly from composites with high chitosan content. |
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