Efficacy of La³⁺ entrapped chitosan bio‐polymeric matrix for the recovery of oil from oil‐in‐water emulsion

Abstract

On the basis of the present study, the details of the recovery of cutting oil from oil‐in‐water emulsion using the modified forms of biopolymer chitosan viz., chitosan beads (CB), carboxylated chitosan beads (CCB), and lanthanum incorporated carboxylated chitosan beads (La‐CCB). Various oil sorption experiments were conducted using an extractive gravimetric method by optimizing various parameters such as contact time, pH, sorbent dosage, and initial oil concentration for maximum sorption. It was found that the oil removal percentage was comparatively less in the case of CB and CCB when compared with La‐CCB, which showed 85% of oil removal at acidic condition. The obtained adsorption equilibrium data was explained with Freundlich, Langmuir, D–R, and Tempkin isotherms to find the best fit for the sorption process. Thermodynamic parameters such as ΔG0, ΔH0, and ΔS0 were calculated in order to understand the nature of sorption process. The surface morphology and sorption of oil on the beads were confirmed by FTIR, SEM with EDAX, XRD, TGA, and DSC analysis. This work provides a potential platform for the expansion of oil removal technology. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43218.

The Use of Lanthanum Ions and Chitosan for Boron Elimination from Aqueous Solutions

“…After the addition of La(NO 3 ) 3 to CTS solution, it solubilizes and undergoes hydration. Under the influence of the NaOH solution, the gelling process starts and the lanthanum complex can coordinate with the reactive amine groups of CTS [41,43]. This results in the formation of a lanthanum-amine adduct and a modification of CTS structure (Scheme 1).…”

“…Microporous lanthanum-chitosan magnetic spheres were also successfully used for phosphate removal from water [42]. Other researchers used the La 3+ entrapped chitosan bio-polymeric matrix for the recovery of oil from an oil-in-water emulsion [43]. In the view of the above reports, it seems highly probably that chitosan modified by lanthanum ions should enhance the adsorption of oxyborates, even though, according to our best knowledge, there are no literature reports describing the separation of oxyborate from aqueous solution using lanthanum(III).…”

Chitosan Hydrogel Beads Supported with Ceria for Boron Removal

“…This polymer has shown a high adsorption potential for various aquatic pollutants in water treatment [19]. Various metal cations, oils and dyes are easily attracted by these groups, due to the chelating effect and electrostatic attraction [20,21,22]. Some typical anions, such as fluoride, nitrate and phosphate, may undergo fixation by electrostatic attraction or ion exchange in acidic media on protonated amine functions [23,24,25].…”

“…Therefore, many ways of functionalising chitosan in order to obtain greater applications have been reported [27]. Among them, rare earth metal-binding chitosan composites have attracted researchers’ attention because of their active properties and high adsorption capacity [21,28,29,30].…”

“…Cerium dioxide is one of the most abundant and cheapest rare earth oxides, possessing resistance to acids and bases and not eluting during the removal of harmful substances in water [29]. Cerium has a good chelating ability with the functional groups present in chitosan and can possess a high adsorption capacity because of its positive charge [21,30]. Biopolymers based on cerium(III) immobilised cross-linked chitosan (CTS-Ce) composites have been prepared and employed for the removal of fluoride and phosphate from water [28,29,31,32].…”