Facile Fabrication of Metal Ions‐Incorporated Chitosan/β‐Cyclodextrin Composites for Effective Removal of Oil from Oily Wastewater

Abstract

In this study, metal ions incorporated cyclodextrin functionalized chitosan were synthesized by a simple one‐pot method which was employed to adsorb the oil droplets from oily wastewater. Adsorption behavior of oil molecules were investigated with binary biopolymer acting as a host‐guest interaction. The synthesized composites were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), energy dispersive X‐ray (EDX), powder X‐ray diffraction (XRD), thermogravimetric analysis (TGA) and heat of combustion. The oil adsorption capacity was studied as a function of various parameters such as contact time, pH of the medium, dose of the adsorbent, initial oil concentration, and temperature. pH plays a prominent role in oil adsorption process, as demulsification takes place in acidic medium. The prepared hybrid composites were successfully utilized to remove the oil molecules from oily wastewater. The adsorption data which followed the Langmuir isotherm model and thermodynamic parameters such as standard free energy (▵G°), standard enthalpy (▵H°) and standard entropy (▵S°) indicated that the adsorption of oil molecules onto the prepared hybrid composites were feasible, spontaneous and endothermic in nature at 30 to 50 °C. Thus, the experimental results presented herein indicate that the prepared hybrid composites can be used as the potential adsorbent for the recovery of oil from oily wastewater.

Water-in-Water Pickering Emulsion Stabilized by Polydopamine Particles and Cross-Linking

“…Nevertheless, triggered demulsification is of particular interest as well. Therefore, a number of methods to demulsify PDP-stabilized emulsions were studied in here. , First, a dextran 40k -in-PEG 35k emulsion (3 wt %, 7 wt %, respectively) was prepared with 0.2 g/L PDP as the stabilizer. These emulsions were very stable and no obvious phase separation was observed over 16 weeks (Figure e).…”

Selective Adsorption of Direct Group Anionic Dyes on Layered Double Hydroxide-Chitosan Composites

“…Composites of Zn/Al-Chitosan and Mg/Al-Chitosan were prepared by mixing layered double hydroxide and chitosan through the co-precipitation method with slightly modified from [29]. The solution of M 2+ /M 3+ (M 2+ = Zn, Mg; M 3+ = Al) with molar ratio 3:1 was mixed and pH was adjusted to 10 by adding 2 M sodium hydroxide.…”

Cyclodextrin Polymers and Cyclodextrin-Containing Polysaccharides for Water Remediation

“…Following that, Fe 3 O 4 nanoparticles are coated by β-CD-chitosan. A peculiar contribution was provided by Elanchezhiyan and Meenakshi [114], who synthesized chitosan-β-CD using glutaraldehyde as a crosslinker in the presence of lanthanum, zirconium, or cerium ions. These metal ions were integrated into the adsorbent.…”