Efficient construction of low shrinkage xerogels via coordination-catalyzed in-situ polymerization for activated carbon xerogels with multi-dyes adsorption
Obtaining large specific surface areas (SSA) for carbon xerogels poses a significant challenge due to the inevitable volume shrinkage of xerogel. Here, the Zn 2+ coordination-catalyzed in-situ polymerization approach was proposed to fabricate xerogels with a low shrinkage of 13.03 % and a short preparation period of 24 h. In resorcinol-formaldehyde (RF) polymerization, ZnCl 2 could accelerate the reaction kinetics through the coordination of the Zn 2+ and hydroxyl groups. The gel network with adjustable RF particles (46.5 nm-1.89 μm) and narrow neck structures was constructed by changing ZnCl 2 and ethanol contents, which could resist volume shrinkage during atmospheric drying without solvent exchange. The activated carbon xerogels (ACXs) with hierarchical structure were designed by one-step carbonization/activation due to the pore-forming of ZnCl 2 . The obtained ACXs showed a large SSA of 1689 m 2 /g, multi-dyes adsorption capacity (methylene blue, Congo red, methyl orange, and Sudan III were 625.90, 359.46, 320.69, and 453.92 mg/g, respectively), and reusability of 100 %. The maximum monolayer MB adsorption capacity was 630.28 mg/g. This work presents an efficient strategy to design porous nanomaterials with low shrinkage and large SSA, which illustrates promising applications in separation, adsorption, and photoelectric catalysis.
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