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Efficient Removal of Toxic Dyes via Simultaneous Adsorption and Solar Light Driven Photodegradation Using Recyclable Functionalized Amylopectin–TiO2–Au Nanocomposite

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journal contribution
posted on 10.02.2016 by Amit Kumar Sarkar, Arka Saha, Abhrojyoti Tarafder, Asit Baran Panda, Sagar Pal
Herein, functionalized amylopectin and in situ generated TiO2 and Au nanoparticles (NPs)-based nanocomposite with excellent toxic organic dye removal capacity, via synergistic effects of adsorption and photocatalytic degradation, along with enhanced antimicrobial activity, is reported. The TiO2 and TiO2–AuNPs incorporated nanocomposites (g-AP-pAA/TiO2, g-AP-pAA/TiO2–Au) have been synthesized by the addition of ethanolic solution of titanium isopropoxide (Ti-iPr) followed by HAuCl4 to the gelling matrix of functionalized amylopectin. Characterization results confirm the formation of uniform distribution of anatase TiO2 (5–8 nm) and Au (7–15 nm) NPs in the polymer matrix. The synthesized g-AP-pAA/TiO2–Au nanocomposite demonstrates excellent potential to remove dyes from concentrated aqueous dye solution via simultaneous adsorption followed by photocatalytic degradation under sunlight through plasmonic photocatalysis. Synthesized g-AP-pAA/TiO2–Au is capable of removing one specific dye from a mixture of dyes. In addition, the photo induced bacterial (Escherichia coli) growth inhibition characteristics of the composite indicate the development of a novel new generation sustainable and cost-effective polymeric nanocomposite.