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Bionanocomposite Hydrogel for the Adsorption of Dye and Reusability of Generated Waste for the Photodegradation of Ciprofloxacin: A Demonstration of the Circularity Concept for Water Purification
journal contribution
posted on 2018-10-22, 00:00 authored by Neeraj Kumar, Hemant Mittal, Saeed M. Alhassan, Suprakas Sinha RayAdsorption has emerged
as a simple and economical approach to water
decontamination; however, it creates large amounts of secondary toxic
waste following the removal of the effluents from the water. The present
investigation introduces an innovative circular approach that tackles
the serious problem of environmentally toxic secondary waste. Herein,
TiO2 nanorods (NRs) and a functionalized gum ghatti (Gg)
biopolymer-based bionanocomposite hydrogel (TGB-hydrogel) were synthesized
by free-radical graft polymerization and used to remove brilliant
green (BG), which is a toxic dye. The dye-adsorbed TGB-hydrogel waste
was then processed at 550 °C for 3 h and re-employed for the
photocatalytic degradation of the antibiotic ciprofloxacin (CIP),
after which the spent photocatalyst was reinstated for the adsorption
of BG dye to complete the cycle. The ability of the TGB-hydrogel to
adsorb the dye was studied in detail by varying the adsorbent dosage,
initial dye concentration, pH, and temperature. Adsorption kinetics
followed a pseudo-second-order kinetics model, whereas the adsorption
isotherm followed the Langmuir isotherm model with a maximum adsorption
capacity of 740.97 mg g–1. The thermodynamic studies
highlighted that the adsorption process was endothermic in nature.
Furthermore, the obtained photocatalyst exhibited high photocatalytic
efficiency, with 88.7% CIP degradation over 180 min due to a recombination
delay of charge carriers, high light absorption, and the high surface
area (179.33 m2 g–1). The introduced
circular approach concept is envisaged to be applicable to other processes
that need to avoid unwanted secondary waste.
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Keywords
water decontamination180 minadsorption capacityfunctionalized gum ghattifree-radical graft polymerizationapproach conceptcharge carriersGenerated WasteLangmuir isotherm modelbiopolymer-based bionanocomposite hydrogeladsorption processWater Purification Adsorptionadsorbent dosageTiO 2 nanorodsphotocatalytic efficiencylight absorptionBionanocomposite HydrogelNRphotocatalyst3 hpseudo-second-order kinetics modelphotocatalytic degradationrecombination delayBG dyeAdsorption kineticsadsorption isothermCIPdye-adsorbed TGB-hydrogel wastedye concentrationCircularity Conceptantibiotic ciprofloxacin
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