Fe-Immobilised Catechol-Based Hypercrosslinked Polymer as Heterogeneous Fenton Catalyst for Degradation of Methylene Blue in Water

Abstract

Clean water is one of the sustainable development goals. Organic dye is one of the water pollutants affecting water quality. Hence, the conversion of dyes to safer species is crucial for water treatment. The Fenton reaction using Fe as a catalyst is a promising process. However, homogeneous catalysts are normally sensitive, difficult to separate, and burdensome to reuse. Therefore, a catechol-based hypercrosslinked polymer (catechol-HCP) was developed as an inexpensive solid support for Fe (catechol-HCP-Fe) and applied as a heterogenous Fenton catalyst. The good interaction of the catechol moiety with Fe, as well as the porous structure, simple preparation, low cost, and high stability of catechol-HCP, make it beneficial for Fe-loading in the polymer and Fenton reaction utilisation. The catechol-HCP-Fe demonstrated good catalytic activity for methylene blue (MB) degradation in a neutral pH. Complete decolouration of 100 ppm MB could be observed within 25 min. The rate of reaction was influenced by H2O2 concentration, polymer dose, MB concentration, pH, and temperature. The catechol-HCP-Fe could be reused for at least four cycles. The dominant reactive species of the reaction was considered to be singlet oxygen (1O2), and the plausible mechanism of the reaction was proposed.

Reusable Copper Catechol‐based Porous Polymers for the Highly Efficient Heterogeneous Catalytic Oxidation of Secondary Alcohols

“…Similarly, catechols are widely used ligands in coordination chemistry, their redox “non‐innocent” properties have been thoroughly explored in catalysis [21,22] . Furthermore, recent studies have shown that metal/catechol species can be efficiently immobilized onto MOF [23–29] and POP [30–35] supports, with applications in hydrogenation, hydrosilylation or catalytic degradation of toxic organophosphate compounds [14] …”

“…[7,8,[14][15][16][17][18][19][20] Similarly, catechols are widely used ligands in coordination chemistry, their redox "non-innocent" properties have been thoroughly explored in catalysis. [21,22] Furthermore, recent studies have shown that metal/catechol species can be efficiently immobilized onto MOF [23][24][25][26][27][28][29] and POP [30][31][32][33][34][35] supports, with applications in hydrogenation, hydrosilylation or catalytic degradation of toxic organophosphate compounds. [14] Herein, we report the synthesis of novel porous macroligands made of redox-active catechol moiety as co-monomer in polymeric matrixes (namely CatMP-1) and their subsequent metalation with Cu cations.…”

Palladium catalyst immobilized on functionalized hyper–cross-linked polymers with 8-hydroxyquinoline as monomer for Suzuki–Miyaura coupling reactions

“…Compared with the material HCPs, the catalytic activity and stability of the immobilized precious metal were signi cantly improved, because of its organic cage frameworks and the coordination between the heteroatoms in HCPs and metal ions, which could x the ultra-ne metal nanoparticles in the cages and make the metal particles rmly anchored to maintain an excellent activity in the long term, as well as serving as a catalyst support for the production of heterogeneous catalytic converters. [7][8][9][10].…”

Halogen-Bonding Interaction-Mediated Efficient Iodine Capture of Highly Nitrogen-Functionalized Hyper-Crosslinked Polymers

“…They are becoming more popular, especially for selective adsorption uses, because of their cost-effectiveness, ability to have their pore structure tuned, and ease of synthesis . HCPs have been demonstrated to be effective adsorption candidates for a variety of chemical species, including cations, anions, and organic compounds. − The application of HCPs in the field of iodine adsorption has gained significant interest since Pastukhov and co-workers employed magnetic iron oxide nanocomposites incorporating polystyrene-based HCPs for iodine adsorption. This primary finding suggested that the porosity of the HCP component could increase the adsorption effectiveness of the composites .…”