Hybrid hydrogels of hyperbranched poly(ether amine)s (hPEAs) for selective adsorption of guest molecules and separation of dyes

Abstract

We herein report a novel hybrid hydrogel (SiO 1.5 -hPEAs-Gels), which was fabricated by the direct hydrolysis of trimethoxysilyl groups containing hyperbranched poly(ether amine)s (TMS-hPEAs) in water. The adsorption behaviors of guest molecule dyes by the obtained SiO 1.5 -hPEAs-Gels were investigated systematically. The adsorption process was found to follow pseudo-first-order kinetics at the initial stage, but followed pseudo-second-order kinetics at later stages. SiO 1.5 -hPEAs-Gels exhibited a quick adsorption of guest dyes such as Ponceau S (PS), Rose Bengal (RB), Neutral Red (NR) and Methyl Orange (MO) with a high adsorption capacity (Q eq ), and very slow adsorption of Methylene Blue trihydrate (MB) and Rhodamine 6G (R6G) with a low adsorption capacity. The big difference in the adsorption behaviors of dyes indicated that the SiO 1.5 -hPEAs-Gels can adsorb guest molecules selectively. Based on these results, we demonstrated a method for dynamic separation of a mixture of dyes, which can be controlled by the contact time. For example, SiO 1.5 -hPEA211-Gel can adsorb and remove only PS selectively from a mixture of PS/MB. These characteristics will give SiO 1.5 -hPEAs-Gels potential for controlled separation.

Influence of the hydrophilic/hydrophobic nature of polyetheramines on the interaction between amine–alcohol–silicate hybrids and anionic dyes for effective water cleaning

“…6,7 Therefore, the resulting hybrid matrix can exhibit enhanced adsorption capacity and incorporate a large number of species. [8][9][10][11] These authors developed hyperbranched poly(etheramine) (hPEA) hybrids for selective dye adsorption and separation. [8][9][10][11] These authors developed hyperbranched poly(etheramine) (hPEA) hybrids for selective dye adsorption and separation.…”

Facile fabrication of magnetic carboxymethyl starch/poly(vinyl alcohol) composite gel for methylene blue removal

“…5a). To determine the parameters associated with MB adsorption, the experimental data of the S4 adsorbent were modeled with the well known Freundlich and Langmuir isotherms [40][41][42]. The linear forms of the two isotherms are expressed as follows:…”

Facile synthesis of mesoporous calcium carbonate particles with finger citron residue as template and their adsorption performances for Congo red

“…The isotherms of the Ni@PCMs samples confirm the nature of mesopore and are of type IV isotherm with two condensation steps in the mesopore range according to the IUPAC (International Union of Pure and Applied Chemistry) classification (Deng et al, 2012;Li et al, 2014). It exhibits a H 1 hysteresis loop with the capillary condensation at a relative pressure (P/P 0 ) & 0.45-0.90.…”