Structural Design of a Cellulose-Based Solid Amine Adsorbent for the Complete Removal and Colorimetric Detection of Cr(VI)

Abstract

A cellulose-based solid amine adsorbent (MCC/TEPAA) with high amino density for the detection and removal of Cr(VI) was designed and prepared through using epichlorohydrin cross-linking with MCC (microcrystalline cellulose) and tetraethylenepentamine (TEPA). The structure and amino density of the cellulose-based solid amine adsorbents could be tailored by adjusting the structure of the amines (triethylenetetramine or diethylenetriamine). The as-prepared cellulose-based solid amine adsorbents could detect and completely remove Cr(VI) from water, and the concentration of Cr(VI) solution after adsorption met the standard concentration of Cr(VI) solution for drinking water (0.05 mg/ L). In particular, the MCC/TEPAA, supported by MCC with porosity as a framework, promoted the adsorption rate (adsorption equilibrium within only 10 min), removal rate (100%) of Cr(VI), and adsorption capacity (327.72 mg/g). In addition, the limit of colorimetric detection of Cr(VI) by MCC/TEPAA was 0.5 mg/L at 20 min when other interfering heavy metal ions exist. The adsorption and colorimetric detection mechanism of Cr(VI) on MCC/TEPAA was proposed to include electrostatic interactions, chelating reactions, and oxidation−reduction reactions, all of which contributed to the excellent adsorption and detection performance.

Cellulose-g-tetraethylenepentamine dual-function imprinted polymers selectively and effectively adsorb and remove 4-nitrophenol and Cr(VI)

“…1i, the FTIR spectra of cellulose and TEPA showed the characteristic peaks of cellulose and TEPA, including the characteristic broad peak of cellulose at 3349 cm −1 and the carbonyl (C=O) stretching vibration at 1721 cm −1 (Xu et al 2019). For TEPA, the C-N vibration of C-NH-C at 1122 cm −1 and the vibration absorption peak of -NH 2 at 1463 cm −1 were observed (Xue et al 2019). The peak at 1450 cm −1 was assigned to -C(CH 3 ) 3 stretching of 2-bromo-2-methylpropionyl bromide.…”

“…The adsorption of Cr(VI) on the protonated amino groups was proved by X-ray photoelectron spectrometry (XPS). Xue et al (2019) designed a cellulose-based solid amine adsorbent by crosslinking epichlorohydrin with microcrystalline cellulose (MCC) and tetraethylenepentamine (TEPA). Rathour et al (2020) modified graphene oxide (GO) with ethylenediaminetetraacetic acid (EDTA), and used its amide bond to adsorb Cr(VI).…”

Cellulose-g-tetraethylenepentamine Dual-function Imprinted Polymers Selectively and Effectively Adsorb and Remove 4-Nitrophenol and Cr(VI)

“…2i, the FTIR spectra of cellulose and TEPA showed the characteristic peaks of cellulose and TEPA, including the characteristic broad peak of cellulose at 3349 cm -1 and the carbonyl (C=O) stretching vibration at 1721 cm -1 (Xu et al 2019). For TEPA, the C-N vibration of C-NH-C at 1122 cm -1 and the vibration absorption peak of -NH 2 at 1463 cm -1 were observed (Xue et al 2019). The peak at 1450 cm -1 was assigned to -C(CH 3 ) 3 stretching of 2-bromo-2-methylpropionyl bromide.…”

“…The adsorption of Cr(VI) on the protonated amino groups was proved by XPS. Xue et al (Xue et al 2019) designed a cellulosebased solid amine adsorbent by crosslinking epichlorohydrin with microcrystalline cellulose (MCC) and tetraethylenepentamine (TEPA). Rathour et al (Rathour et al 2020) modi ed graphene oxide (GO) with ethylenediaminetetraacetic acid (EDTA), and used its amide bond to adsorb Cr(VI).…”

Semicarbazide Functionalized Flax Fibers for Effective Adsorption of Cr(VI) from Wastewater Samples

“…It is easily modified because of the presence of three hydroxyl groups in each cellulose unit. It is modified by several techniques like oxidation, esterification, etherification, and halogenation [18][19][20][21][22][23][24][25][26][27]. In recent years, ion-pair formation has been used to remove various organic and inorganic contaminants.…”