Polyethyleneimine as a novel desorbent for anionic organic dyes on layered double hydroxide surface

Adsorption of polyhydroxy fullerene on polyethylenimine-modified montmorillonite

“…Interestingly, the band at 1375 cm −1 , arising from C\ \O\ \H bending vibrations, blueshifted to 1385 and 1393 cm − 1 for 10%PEI-Mt-PHF obtained at pH 6 and 11, respectively, which suggested strong interaction between the adsorbed PHF and PEI-Mt, probably the formation of hydrogen bonding between them. A similar phenomenon was observed by Wang et al (2015) who disclosed that the enhanced hydrogen bonding between PEI and anionic compounds at high pH values could lead to a visible shift on the corresponding FTIR band vibrations. XRD has been regarded as a powerful tool to study the microstructure of clay minerals (He et al, , 2006aVicente et al, 2013;Chen et al, 2016).…”

“…On the other hand, the adsorption amount of PHF was still relatively large when the solution pH was above the pH zpc of 10%PEI-Mt, although the electrostatic interaction between PHF and PEI became weak because of the formation of the neutral PEI-Mt composites. Several previous studies disclosed that a great number of amino groups on PEI could generate strong attraction with other organic compounds through hydrogen bonding (Chibowski et al, 2009;Wang et al, 2015). As such, one might propose that the hydrogen bonding between PEI and PHF could contribute to the high adsorption capacity at high pH values.…”

Polyethylenimine nanofibrous adsorbent for highly effective removal of anionic dyes from aqueous solution

“…Polyethylenimine (PEI) has a high amine density and accessible primary amine sites on the chain ends, which act as desirable building blocks for the construction of adsorbents. For instance, many excellent CO 2 adsorbents have been prepared by integrating PEI into porous materials, including silica [12], mesoporous carbon [13], titanate [14], polymeric supports [15], and other metal oxide nanocomposites [16]. In addition, because of the high positive charge density on the protonated PEI backbone or side chains, PEI-based adsorbents exhibit good adsorption capacity for acidic gas or anionic materials such as polyanions and negatively charged organic or inorganic matter, including various anionic dyes [16][17][18][19].…”

“…For instance, many excellent CO 2 adsorbents have been prepared by integrating PEI into porous materials, including silica [12], mesoporous carbon [13], titanate [14], polymeric supports [15], and other metal oxide nanocomposites [16]. In addition, because of the high positive charge density on the protonated PEI backbone or side chains, PEI-based adsorbents exhibit good adsorption capacity for acidic gas or anionic materials such as polyanions and negatively charged organic or inorganic matter, including various anionic dyes [16][17][18][19].Electrospinning is an effective approach to prepare ultrafine fibers; it uses an electrostatic force from an external high-voltage electrical field between a spinneret and a grounded collector to draw very fine (typically micro-to nanoscale) fibers from a liquid droplet [20]. The ultrafine fibers produced by electrospinning have very high specific ABSTRACT We prepared a nanofibrous adsorbent for anionic dye removal from aqueous solution by electrospinning a modified polyethylenimine (m-PEI) and polyvinylidene fluoride (PVDF) blend.…”

Preparation of layered double hydroxides using boron mud and red mud industrial wastes and adsorption mechanism to phosphate

“…Many literatures had reported that LDH could adsorb the heavy metals such as Pb, Cd, Cu and so on (Zhao et al 2011;Rojas 2014;Huang et al 2015). Meanwhile, there were also many literatures focusing on organics wastewater removal by LDH (G€ ok et al 2014;Wang et al 2015;Li et al 2016;Zhang et al 2016;Zhao et al 2016). In addition, the few literatures which LDH treated the microorganisms in wastewater had been reported (Morris et al 2008;Liu et al 2013).…”