Efficient removal of bisphenol pollutants on imine-based covalent organic frameworks: adsorption behavior and mechanism

Abstract

Two imine-based covalent organic frameworks with different pore sizes were synthesized, and can be used as adsorbents for the removal of bisphenol pollutants, showing high affinity toward bisphenol S and bisphenol A.

Controlled synthesis of graphene oxide/silica hybrid nanocomposites for removal of aromatic pollutants in water

“…As a result, the amount of aromatic that could be adsorbed was reduced. The negative G° indicated that the adsorption was a spontaneous process, and the value of ΔG° decreased as the temperature dropped, showing that lower temperatures enhanced TB and BPA adsorption on FGS2 56 .…”

“…Between the hydroxyl groups of BPA or TB and the hydrophilic groups (such as carboxyl groups and hydroxyl groups) of FGS2, there are two types of adsorbate-adsorbent interactions: hydrogen bonding and π–π interaction between the benzene ring in BPA and the phenyl groups in FGS2. The adsorption performance of organic pollutants on porous materials like GO/SiO 2 was previously shown to be influenced not only by intrinsic characteristics (e.g., charge, size, and electronic states), but also by weak intermolecular interactions (e.g., hydrogen-bonding and – interactions), hydrophobic interactions, and electrostatic interactions 56 , 57 . The probable adsorption mechanisms involved in TB dye and BPA removal by FGS2 were shown in Fig.…”

“…13 a). When there was no identifiable adsorption site, the adsorption capacity of adsorbents increased with the enlargement of the specific surface area 56 . As a result, FGS2 had the greatest surface area, making it more effective at removing TB and BPA.…”

“…Bisphenol A, in particular, has a high hydrophobicity and can be coupled with the hydrophobic site on FGS2's surface. As a result, a hydrophobic interaction plays a role in FGS2's ability to absorb BPA 56 . However, the hydrophobic interaction is not the most important factor in TB and BPA adsorption on FGS2.…”

Facile room temperature synthesis of a NiFe2O4-based magnetic covalent organic framework for the extraction of tetracycline residues in environmental water samples prior to HPLC

“…Previous research veried that imine COFs with good water stability and abundant C]N binding sites were a good choice for the removal of contaminants from wastewater. [28][29][30] It was reported that the eclipsed honeycomb structure of COF networks formed between 1,3,5-tris(4aminophenyl)benzene (TAPB) and terephthalaldehyde (TPA) by a simple solvothermal approach were highly porous COF precursors, 31,32 and the imine linkages could be easily transformed into amide linkages. 33 These COF networks could, in principle, provide the optimal nano-architecture needed for them to perform well in the extraction of target pollutants.…”