<p xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="first" id="d8499263e123">The
presence of emerging micropollutants and dyes in water resource has raised global
concern about their intense effects to aquatic environments, ecosystem and human health
in general. So far, various adsorbents have been suggested for reducing the levels
of bisphenol A, methylene blue and neutral red contamination in wastewaters. However,
a number of these adsorbents seemed to have low adsorptive capacities and regeneration
performances. In view of these, batch experiment was performed to decontaminate these
pollutants from aqueous solutions using an optimized bagasse-β-cyclodextrin polymer
(SB-β-CD). Characterization studies of SB-β-CD were performed using FTIR, pH point
of zero charge, XRD and BET methods. Adsorption of BPA, MB and NR was favored at lower
temperature (298 K) and pH of 7.0, 9.0 and 6.0, respectively. The maximum adsorption
capacity of BPA, MB and NR at 298 K was 121, 963 and 685 mg g-1, respectively. Hydrogen
bonding through host-guest inclusion and electrostatic interactions could respectively
attribute to uptake of BPA and MB/NR onto SB-β-CD. Adsorption kinetics of three pollutants
followed pseudo-second-order model. Langmuir and Freundlich models were fitted to
describe the adsorption of BPA and MB/NR, respectively. Thermodynamic parameters confirmed
the occurrence of physical adsorption which is spontaneous and exothermic in nature.
SB-β-CD loaded with BPA and MB/NR was certainly reused by 75% ethanol and 0.1 mol L-1
HCl solutions, respectively. Novel SB-β-CD showed better adsorptive capacity and regeneration
performances; consequently can offers practical application for removal of BPA, MB
and NR from wastewaters.
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