Synthesis of a chitin-based biocomposite for water treatment: Optimization for fluoride removal

FTIR - An Essential Characterization Technique for Polymeric Materials

“…One research has recently reported characterization of the polyurethane-chitin interaction in a novel fluoride biosorbent biocomposite, using attenuated total reflection Fourier transform infrared spectroscopy (FTIR-ATR) (Davila-Rodriguez et al, 2009). Such a biocomposite was produced by mixing chitin flakes with polyurethane (60:40 w/w) during the polymerization reaction, which was carried out under intense stirring.…”

“…Hence, such unions make polyurethane a good support matrix for biosorbents. In fact, more and more studies have been recently published about the use of polyurethane as support of biosorbents as seaweed (Alhakawati & Banks, 2004;Zhang & Banks, 2006), moss, sunflower waste and maize plant (Zhang & Banks, 2006), bacteria (Vullo et al, 2008;Mao et al, 2010), fungi (Sudha & Abraham, 2003;Li et al, 2008) and chitin (Davila-Rodriguez et al, 2009). Most of these studies have focused on the biocomposite biosorption capacity; however, the interaction polyurethane-biosorbent has been practically not studied.…”

Effect of acid on morphology of calcite during acid enhanced defluoridation

“…The principles that are used for fluoride removal are based on adsorption [6][7][8][9], precipitation-coagulation [10,11], ion-exchange [12], membrane separation process [13,14], electrolytic defluoridation [15], electrodialysis [16][17][18][19], etc. Some recently used adsorbent for fluoride are laterite [20], waste residue from alum manufacturing plant [21], activated carbon prepared from Morringa Indica bark [22], carboxymethylated starch-based hydrogels loaded with Fe 2+ [23], alum-impregnated activated alumina [24], etc.…”

Dextran-graft-poly(hydroxyethyl methacrylate) gels: a new biosorbent for fluoride removal of water

“…As expected, the prepared gels showed no fluoride absorbency at neutral, but their fluoride absorbability significantly increased at acidic (Table 3). The electrostatic attraction between fluoride ions and hydroxyl groups in the backbone of dextran and HEMA moieties, protonated at such pH values, was proposed as the main sorption mechanism [29,35].…”

“…Among various polysaccharides, chitin and chitosan derivatives have been gained wide attention as effective biosorbents due to their low cost and high contents of amine and hydroxyl functional groups which show significant adsorption potential for the removal of various aquatic pollutants [26][27][28][29][30][31]. Dextran is another polysaccharide that possesses a complex glucan structure of nearly 5-10% (1,3) α-linked branched units, on average; along with its major linear backbone composed of (1,6) α-D-glycoside residues derived from bacterial sources having three hydroxyl functional groups per each glucose moiety.…”