New Way to Analyze the Adsorption Behavior of Flavonoids on Macroporous Adsorption Resins Functionalized with Chloromethyl and Amino Groups

Abstract

A series of macroporous adsorption resins (MARs) with novel structure were synthesized on the basis of the Friedel-Crafts catalyzed and amination reaction. Adsorption feature of the synthetic resins with respect to the purification effect were investigated systemically by employing rutin as the adsorbate. Different from traditional adsorption patterns, the results showed interesting conclusions: (1) With the increase in the temperature of the experiment, the adsorption capacity increased gradually; with the increase in the concentration of the initial solution, the adsorption capacity increased to the maximum and then decreased gradually. (2) The classical models that the inductive effect transmitted to the first layer and the adsorption process contained in one compartment could not explain our experimental results reasonably. Thus, a new adsorption isotherm model that the inductive effect passed on to a higher layer and a new adsorption kinetics model in which the adsorption process contained more compartments were created according to the multiparameter theory and Karickhoff's theory by investigating the regression of the experimental results. The conclusion that the inductive effect passed to the fourth layer and the adsorption process contained four compartments was drawn.

Retracted: Adsorption Features of Flavonoids on Macroporous Adsorption Resins Functionalized with Ionic Liquids

“…[33] In order to investigate the adsorption features of MARs, a series of MARs functionalized with chloromethyl and amino groups was synthesized, and they produced higher adsorption capacity than the original ones. [34] Herein, we focus on a new method for investigating the adsorption-kinetics features. Synthetic MARs show a higher adsorption capacity due to their better adsorption driving force.…”

“…Thus, the oxygen in the air affected the XPS results of the resins example. [32,34] The pore-size distribution of the original resin and Bim/ MARs, as revealed by the BJH (Barrett-Joyner-Halenda) method, is shown in Figure 2. The isotherm of Bim/MARs is shown in Figure 2 a, which is of type IV adsorption isotherm with an H1 hysteresis loop according to the IUPAC recommendations.…”

Purification of phloridzin from Lithocarpus polystachyus Rehd leaves using polymeric adsorbents functionalized with glucosamine and β-cyclodextrin

“…In recent years, many researchers have also developed an adsorption feature of MARs (Lou et al, 2011;Huang et al, 2011). The functional group of an adsorbent is one of the most important factors when improving the separation efficiency.…”

“…It is reported that MARs modified by special functional groups can be potentially applied in the separation and purification to obtain bioactive components from crude extracts of natural products (Yang & Tan, 2008;Patil & Gaikar, 2011;Ren et al, 2008;Xu et al, 2000). Lou et al (2011Lou et al ( , 2012 reported the use of MARs functionalized with chloromethyl, amino, and phenylamino groups in the adsorption of gallate and caffeine and the purification of flavonoids from Hippophae ramnoides L. leaves (Lou et al, , 2011. However, the application of adsorbents functionalized with glucosamine and β-CD for flavonoids separation has been ignored.…”

DFT study on hydrogen-bonding adsorption mechanism of rutin onto macroporous adsorption resins functionalized with amino, hydroxyl, and carboxyl groups

“…However, theoretical research on the adsorption features of MARs lags far behind. Although there are several reports about the adsorption feature of MARs, and many of adsorption systems have been observed to exhibit multiphasic behavior [12][13][14]. But little has been done to determine the impacts of the pore size distribution and the functional groups of polymer resins.…”