Preparation and thermal properties of chitosan/bentonite composite beads
Due to their biodegradable and nontoxic nature, biopolymer composites are often used as remarkable adsorbents in treatment of wastewater. In this study chitosan/bentonite composite beads were obtained by addition of clay into the polymer using solution process. Before the composite preparat...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Association of Chemical Engineers of Serbia
2014-01-01
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| Series: | Hemijska Industrija |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0367-598X/2014/0367-598X1300088T.pdf |
| Summary: | Due to their biodegradable and nontoxic nature, biopolymer composites are
often used as remarkable adsorbents in treatment of wastewater. In this study
chitosan/bentonite composite beads were obtained by addition of clay into the
polymer using solution process. Before the composite preparation, bentonite
was modified with surfactant cetyltrimethyl ammonium bromide (CTAB). The
morphology of beads was examined by scanning electron microscopy (SEM).
Thermal properties of the composite beads were studied by simultaneous
thermogravimetry coupled with differential scanning calorimetry (SDT) and
differential scanning calorimetry (DSC). TG results showed that the complex
decomposition mechanism of the composites depends on the preparation
procedure. It was observed that the concentration of NaOH used for composites
precipitation affects the final structure of beads. The influence of
preparation procedure on the glass transition temperature Tg of
chitosan/bentonite samples was not found (Tg values for all samples were
about 144 °C). [Projekat Ministarstva nauke Republike Srbije, br. III45022
and ON172014 and Provincial Secretariat of Vojvodina for Science and
Technological Development 114-451-2396/2011-01.] |
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| ISSN: | 0367-598X 2217-7426 |