Abstract
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).
Highlights
The biopolymer composites are often used as remarkable adsorbents in treatment of wastewater due to their biodegradable and nontoxic nature
From scanning electron microscopy (SEM) images it can be seen that beads formed at high NaOH concentration have more irregular spherical shape, so we may conclude that surface changes of chitosan/bentonite composite beads depend on preparation method and conditions
This paper was aimed to optimize the preparation procedure of biopolymer/clay composite beads based on chitosan and bentonite intended for wastewater purification
Summary
The biopolymer composites are often used as remarkable adsorbents in treatment of wastewater due to their biodegradable and nontoxic nature. The chitosan/bentonite composite beads, in this study, were obtained by addition of clay into the polymer using solution process. Many adsorption methods using chitosan composites are being developed to adsorb dyes as a substitute for conventional wastewater treatment methods [5]. One of the many forms of chitosan for the dye removal by adsorption is its gel-bead form. It is used for adsorption in batch or fixed-bed column systems, deposited on an adequate substrate [14,15,16]. The main reasons for the success of chitosan is that it can bind dyes in low concentrations compared to metal salts and is efficient in cold water. Chitosan is biodegradable, so the sludge can be efficiently degraded by micro-organisms
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