Fabrication of β-cyclodextrin modified mesostructured silica coated multi-walled carbon nanotubes composites and application for paraben removal

Abstract

In this work, the novel β-cyclodextrin modified mesostructured silica coated multi-walled carbon nanotubes (MWCNTs) composites were synthesized and applied for the removal of parabens in aqueous solution. The prepared MWCNTs/SiO2/β-CD composites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and thermogravimetric analysis. The effects of the amount of adsorbent, pH and elution solvents on the removal efficiency of parabens from water solutions were investigated. Under the optimized conditions, over 95% removal efficiency was achieved by using 40 mg of MWCNTs/SiO2/β-CD adsorbents to absorb the parabens from 60 mL of 0.5 μg/mL parabens solutions. The solution pH in the range from 5 to 9 has no influence on the removal efficiency and the parabens sorption capacity of the prepared adsorbents were around 0.75 μg/mg. Furthermore, the stability and reusability studies demonstrated that the prepared MWCNTs/SiO2/β-CD composites are cost-effective adsorbents for the removal of parabens from water with high regeneration efficiency. The composites fabricated in this study could become an attractive candidate for water purification.

Modified Cellulose for Adsorption of Methylparaben and Butylparaben from an Aqueous Solution

“…64,65 Our findings appear to be well supported by other research on the removal of MP and BP from aqueous solutions with various adsorbents; this result has been summarized in Table S6. The comparison of the adsorption capacity of modified cellulose (MCB and MCM) with other reported adsorbents was difficult because the condition employed for assays was diverse, but MCB and MCM were better than some adsorbents such as magnetic nanoparticles with a phenyl group, 15 polyacrylonitrile beads, 66 porous N-doped graphene-based NiO composite, 67 β-cyclodextrin-modified mesostructured silica-coated multiwalled carbon nanotube composites, 68 polyamide, 69 and coconut-based activated carbon. 70 In addition, the best adsorbent in our study, MCM, had advantages such as a low amount of adsorbent loading and easy separation of adsorbent using an external magnetic field.…”

Carboxymethylcellulose/Hydrotalcite Bionanocomposites as Paraben Sorbents

“…A number of methods based on oxidation, photocatalysis, and decomposition reactions have been used to remove parabens from wastewater. One widely used method for this purpose involves adsorption onto silica, , a filtering membrane or a clayey solid such as an anionic clay. − Especially prominent in this respect are layered double hydroxides (LDHs), also known as “hydrotalcites” after their parent material: hydrotalcite [Mg 6 Al 2 (OH) 2 CO 3 ·4H 2 O]. This mineral consists of stacked octahedral layers similar to those of brucite [Mg­(OH) 2 ], where substitution of a certain number of Mg 2+ ions by Al 3+ ions results in a charge deficiency that is offset by carbonate anions present in the interlayer region…”

“…A number of methods based on oxidation, 8 photocatalysis, 9 and decomposition reactions 10 have been used to remove parabens from wastewater. One widely used method for this purpose involves adsorption onto silica, 11 , 12 a filtering membrane 13 or a clayey solid such as an anionic clay. 14 − 17 Especially prominent in this respect are layered double hydroxides (LDHs), also known as “hydrotalcites” after their parent material: hydrotalcite [Mg 6 Al 2 (OH) 2 CO 3 ·4H 2 O].…”