Amino acid-driven adsorption of emerging contaminants in water by modified graphene oxide nanosheets

Abstract

Graphene oxide nanosheets have shown promising adsorption properties toward emerging organic contaminants in drinking water. Here, we report a family of graphene oxide nanosheets covalently modified with amino acids, and...

Thermal and bisphenol-A adsorption properties of a zinc ferrite/β-cyclodextrin polymer nanocomposite

“…The adsorption performance of β-CD-E-T/ZnFe 2 O 4 nanocomposite was compared with previously reported adsorbents for the removal of BPA (Table 4). 13,19,26–30,39,40,50–53,55–58 As reported in Table 4, β-CD based adsorbents like carboxymethyl-β-CD polymer/Fe 3 O 4 composite, β-CD/graphene-magnetite nanocomposite, and polyethylenimine-polyethylene glycol-β-CD polymer were not very effective for the BPA elimination from the aqueous solution. 27,29,30 The β-CD based polymer and composites were having a maximum uptake of 65–139 mg BPA per ‘g’ of adsorbent used.…”

A Comprehensive Review of Novel Adsorbents for Per- and Polyfluoroalkyl Substances in Water

“…Graphene, a single layer of carbon atoms arranged in a hexagonal lattice, has emerged as a potential adsorbent for PFAS removal due to its large surface area, unique electronic properties, and excellent mechanical and thermal stability. − Graphene oxide (GO), a derivative of graphene containing various oxygen functional groups (e.g., hydroxyl, epoxy, and carboxyl groups), offers additional advantages such as improved hydrophilicity and tunable surface chemistry. , The adsorption of PFAS onto graphene and GO is governed by several mechanisms, including van der Waals, electrostatic (dipolar), and Coulombic interactions. Oxygen-containing functional groups on GO enhance its affinity for PFAS through the possible formation of hydrogen bonds and electrostatic interactions …”

Diethylenetriamine-functionalized reduced graphene oxide having more amino groups for methylene blue removal

“…These amino groups might be present in NH 2 -boron dipyrromethenes 16 and amino acids. 17 Although Jana et al did not mention the substitution reaction of epoxide, it probably reacted with the amino group of ethylenediamine during the synthetic process. 13 In fact, the epoxide and carboxylic acid of GO can simultaneously react with the amino group of various compounds, such as polyethylenimine, 18 diethylenetriamine, 19 butylamine, 20 and polyaniline, 21 under different conditions.…”

“…These amino groups might be present in NH 2 -boron dipyrromethenes 16 and amino acids. 17 Although Jana et al did not mention the substitution reaction of epoxide, it probably reacted with the amino group of ethylenediamine during the synthetic process. 13…”