Abstract
In this study, chitosan/hematite nano-composite hydrogel capsules (HC-H) was developed via anionic surfactant gelation occurring simultaneously with immobilization and impregnation of α-Fe 2 O 3 nanoparticles (HNPs) within the gel matrix. The nanocomposite adsorbent was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), inductively coupled plasma optical emission spectrometry (ICP-OES), X-ray diffractometry (XRD) and elemental analyzer. The HC-H was successfully used for the removal of Congo red (CR) from aqueous solution. The CR adsorption isotherm data fitted to the non-linear forms of the Langmuir, Freundlich and Redlich–Peterson isotherm models indicated that both physisorption and chemisorption were essential in the overall adsorption process. The maximum Langmuir adsorption capacity of HC-H was 4705.6 mg/g (26.7 times more that of the pristine chitosan hydrogel capsule (176.5 mg/g)). The adsorption kinetics data were fitted with the non-linear forms of pseudo first-order and pseudo second-order and intraparticle diffusion models. The overall adsorption process was pH dependent. The HC-H represents a chitosan-based nano-composite adsorbent with stupendous affinity for CR dye molecules and thus, has huge prospect to be considered in wastewater treatment.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
