Improved synthesis of a branched poly(ethylene imine)‐modified cellulose‐based adsorbent for removal and recovery of Cu(II) from aqueous solution

Abstract

This study focuses on an improved synthesis of a branched poly (ethylene imine) (PEI)-modified cellulose-based adsorbent (Cell-g-PGMA-PEI). We aim to improve the adsorbent capacity by reducing side reaction of epoxide ring opening during graft copolymerization of glycidyl methacrylate (GMA) onto cellulose which increases the content of epoxy groups, anchors to immobilize branched PEI moieties. FTIR spectra provided the evidence of successful graft copolymerization of GMA onto cellulose initiated by benzoyl peroxide (BPO) and modification with PEI. The amount of epoxy groups of Cell-g-PGMA was 4.35 mmol g À1 by epoxy titration. Subsequently, the adsorption behavior of Cu(II) on cell-g-PGMA-PEI in aqueous solution has been investigated. The data from the adsorption kinetic experiments agreed well with pseudo-second-order model. The adsorption isotherms can be interpreted by the Langmuir model with the maximum adsorption capacity of 102 mg g À1 which was largely improved compared with the similar adsorbent reported. The dynamic adsorption capacity obtained from the column tests was 119 mg g À1 and the adsorbent could be regenerated by HCl of 0.1 mol L À1 . Results indicate that the novel pathway for the synthesis of Cell-g-PGMA-PEI exhibits significant potential to improve the performance of adsorbents in removal and recovery of Cu(II) from aqueous solution.

Synthesis of polyaminophosphonic acid-functionalized poly(glycidyl methacrylate) for the efficient sorption of La(III) and Y(III)

“…On the other side, new bands appear at 1561 cm −1 and 1629 cm −1 , attributable to NeH bending modes in secondary and primary amines, respectively [52,53]. Similar modifications were observed in the case of cellulose modified first with PGMA and secondly by supplementary grafting of polyethyleneimine (PEI) [50], and on PGMA sorbent modified by grafting ethylene diamine [49]. Additional changes, poorly resolved, are observed around 3350 cm −1 , due to the presence of NeH groups (Fig.…”

“…Based on the structure of PGMA the most significant groups that can be used for identifying the fingerprint of the polymer are: (a) the carbonyl groups (υ(eCOOe),) at 1718 cm −1 [48], and (b) the oxirane ring characterized by asymmetrical expansion and stretching vibrations, at 843 cm −1 and 904 cm −1 , respectively [13,49,50]. Another peak, close to 757 cm −1 , has also been assigned to epoxy ring [51].…”

Hydrazinolyzed cellulose-g-polymethyl acrylate as adsorbent for efficient removal of Cu(II) and Ni(II) ions from aqueous solution

“…One assumption is that monolayer adsorption occurs at a specific adsorption surface and the other is that all adsorbate molecules do not interact with each other and adsorption takes place on a homogeneous adsorbent. The linear Langmuir equation can be expressed as follows: C e q e = C e q m + 1 q m K L (5) where q e (mg g −1 ) and C e (mg L −1 ) are amount (mg) of adsorbed metal ions per unit weight (g) of adsorbent and metal ions concentration in solution at equilibrium; K L (L mg −1 ) is Langmuir constant relating to free energy of adsorption; q m is the maximum adsorption capacity of adsorbent. On the other hand, Freundlich model, an empirical equation based on heterogeneous surface and multilayer adsorption, can be presented as follows:…”

Visible sequestration of Cu2+ions using amino-functionalized cotton fiber

“…At low pH value, the H + with much higher concentration than the copper ions competed for the amine sites on ACF samples in solution, resulting in the protonated amines, which in turn prevented the approaching of copper ions through the strong electrostatic repulsion. 27 It was observed from Fig. 5 that the ACF-Cu at pH 1 showed a while color with a small amount of copper ions adsorbed.…”