10.1021/acssuschemeng.8b04347.s001
Neeraj Kumar
Neeraj
Kumar
Hemant Mittal
Hemant
Mittal
Saeed M. Alhassan
Saeed M.
Alhassan
Suprakas Sinha Ray
Suprakas Sinha
Ray
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
American Chemical Society
2018
water decontamination
180 min
adsorption capacity
functionalized gum ghatti
free-radical graft polymerization
approach concept
charge carriers
Generated Waste
Langmuir isotherm model
biopolymer-based bionanocomposite hydrogel
adsorption process
Water Purification Adsorption
adsorbent dosage
TiO 2 nanorods
photocatalytic efficiency
light absorption
Bionanocomposite Hydrogel
NR
photocatalyst
3 h
pseudo-second-order kinetics model
photocatalytic degradation
recombination delay
BG dye
Adsorption kinetics
adsorption isotherm
CIP
dye-adsorbed TGB-hydrogel waste
dye concentration
Circularity Concept
antibiotic ciprofloxacin
2018-10-22 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/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/7290212
Adsorption 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,
TiO<sub>2</sub> 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<sup>–1</sup>. 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 m<sup>2</sup> g<sup>–1</sup>). The introduced
circular approach concept is envisaged to be applicable to other processes
that need to avoid unwanted secondary waste.