Porous Covalent Organic Gels: Design, Synthesis and Fluoroquinolones Adsorption

Abstract

We report the design and synthesis of three highly stable and porous covalent organic gels (H C OGs) based on C 3 -symmetric benzene-1,3,5-tricarbohydrazides. The resultant H C OGs beared excellent adsorption properties and represented good reusability towards fluoroquinolones from aqueous solutions. The external adsorption behavior as well as internal mechanisms were both discussed. Using kinetic and isotherm analysis, we found that the adsorption processes of the three H C OGs keep to the pseudo-second order kinetic model and abide by the Langmuir isotherm model. Furthermore, the adsorption efficiency and maximum adsorption capacity were demonstrated to be as a result of the internal mechanisms involving proper poriness, electrostatic interactivity, hydrophobic interaction, π-π stacking/interactions and hydrogen bonding. The work thus pays a new way for the preparation of novel porous materials for removing fluoroquinolones from wastewater.

A Triazole‐Based Covalent Gel Loaded with Cu/Pd Bimetallic Nanoparticles for Efficient Catalytic Cross‐Coupling Reactions

“…[35][36][37] Gels possess hierarchical pore structure, providing micropores for anchoring the catalytic center and macropores for efficient mass transfer. [38][39][40] However, because of the instability of gels under harsh conditions, a few gel systems have been reported to catalyze cross-coupling reactions and suffer from low catalytic efficiency. [41,42] Therefore, it is important to construct a stable gel-based catalytic system that can tolerate harsh conditions and has high catalytic efficiency.…”

“…Various porous materials with specific structures have been used as supports, including carbon material, [23,24] silicon dioxide, [25,26] zeolites, [27,28] MOFs, [29,30] COFs, [31,32] POPs, [33,34] and gels [35–37] . Gels possess hierarchical pore structure, providing micropores for anchoring the catalytic center and macropores for efficient mass transfer [38–40] . However, because of the instability of gels under harsh conditions, a few gel systems have been reported to catalyze cross‐coupling reactions and suffer from low catalytic efficiency [41,42] .…”

Cationic Surfactant Modified 3D COF and Its Application in the Adsorption of UV Filters and Alkylphenols from Food Packaging Material Migrants

“…With the addition of CTAB, which contains a cationic group, the synthesized COF was expected to form electrostatic interactions with the analytes, while the main COF skeleton can form hydrophobic effect, π−π interactions and hydrogen bonding with the analytes. 11 Therefore, the synthesized COF was expected to show good adsorption performance for negatively charged analytes because these interactions have been reported to be especially important in the adsorption process. 11−13 The adsorption performance of the synthesized COF can be verified in the enrichment of UV filters and alkylphenols migrants from food packaging material.…”