Removal of Parabens from Aqueous Solution Using β-Cyclodextrin Cross-Linked Polymer

Abstract

The removal of four parabens, methyl-, ethyl-, propyl-, and benzyl-paraben, by β-cyclodextrin (β-CD) polymer from aqueous solution was studied. Different β-CD polymers were prepared by using two cross-linkers, i.e., hexamethylene diisocyanate (HMDI) and toluene-2,6-diisocyanate (TDI), with various molar ratios of cross-linker. β-CD-HMDI polymer with molar ratio of 1:7 and β-CD-TDI polymer with ratio 1:4 gave the highest adsorption of parabens among the β-CD-HMDI and β-CD-TDI series, and were subsequently used for further studies. The adsorption capacity of β-CD-HMDI is 0.0305, 0.0376, 0.1854 and 0.3026 mmol/g for methyl-, ethyl-, propyl-, and benzyl-paraben, respectively. β-CD-TDI have higher adsorption capacities compared with β-CD-HMDI, the adsorption capacity are 0.1019, 0.1286, 0.2551, and 0.3699 mmol/g methyl-, ethyl-, propyl-, and benzyl-paraben respectively. The parameters studied were adsorption capacity, water retention, and reusability. Role of both cross-linker in adsorption, hydrophobicity of polymers, and adsorption capacity of different parabens were compared and discussed. All experiments were conducted in batch adsorption technique. These polymers were applied to real samples and showed positive results.

Microwave-assisted synthesis of cyclodextrin polyurethanes

“…One method to facilitate its use is to produce polymers that incorporate CD (e.g., Harada, Takashima, & Yamaguchi, 2009;van de Manakker, Vermonden, van Nostrum, & Hennink, 2009;Zhou & Ritter, 2010). Indeed, CD-based polymers have been used in quite a number of applications, including drug delivery, removal of toxic compounds from the environment, removal of cholesterol from food items, the stabilization of volatile or unstable ingredients in foods, encapsulation of fragrance and flavor molecules, and many others (Chin, Mohamad, & Bin Abas, 2010;Rohrbach, Zemel, & Koch, 1992;Shirasawa, Ueda, Appell, & Goto, 2013;Xiao, Dudal, Corvini, Pieles, & Shahgaldian, 2011).…”

Fenton advanced oxidation of emerging pollutants: parabens

“…Since these chemicals may cause severe damages to health, the development of highly effective removal methods is receiving a great deal of attention in the last years. The use of processes such as adsoprtion [13,14] or biosorption [15] have demonstrated to be effective in the treatment of waters polluted with parabens. The main advantage of this kind of processes is their relatively low cost.…”

A comparative study on different functionalized mesoporous silica nanomagnetic sorbents for efficient extraction of parabens

“…Polyaniline-coated Fe 3 O 4 nanoparticles were used for extraction of three parabens from environmental wastewater, cream and toothpaste samples [15]. Magnetic nanocomposites of self-doped polyaniline-graphene were also used for the magnetic solid-phase extraction of methyl-, propyl-, and butylparabens [16].The removal of four parabens, methyl-, ethyl-, propyl-and benzylparaben, by β-cyclodextrin (β-CD) polymer from aqueous solution has been studied [17]. Amino-functionalized MNPs were also used for determination of parabenes in aqueous media by Abbasghorbani et al [18].…”