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Functional Hyper‐Crosslinked Polypyrene for Reductive Decolorization of Industrial Dyes and Effective Mercury Removal from Aqueous Media
Author(s) -
Varyambath Anuraj,
Song Wen L.,
Kim Il
Publication year - 2018
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201800494
Subject(s) - chemistry , sorbent , aqueous solution , adsorption , congo red , catalysis , alkylation , cystamine , polymer chemistry , conjugated system , ether , methyl orange , pyrene , polymer , organic chemistry , photocatalysis , biochemistry
A rigid and valuable hyper‐crosslinked polymer (HCP) has been synthesized from the polycyclic aromatic hydrocarbon pyrene: hyper‐crosslinked polypyrene (HCPPy). HCPPy was prepared through a simple one‐step Friedel‐Crafts alkylation reaction that involves ZnBr 2 ‐catalyzed crosslinking in the presence of an external crosslinker, bromomethyl methyl ether (BME). Interestingly, the unreacted bromomethyl groups (−CH 2 Br) on the surface of HCPPy could be quantified, which later aided in modification as per our requirement. We aimed at modifying with disulfide‐containing cystamine dihydrochloride (Cys‐HCPPy). Cys‐HCPPy exhibited an extended π‐conjugated system with uniform (∼1 μm diameter) morphology and high porosity (specific surface area: 445 m 2 g −1 ). As a fundamental application, the Cys‐HCPPy composite was used as a sorbent to remove Hg 2+ ions from aqueous media. Thus, at pH 6, the adsorption capacity for mercury ions reached 1124.82 mg g −1 after 24 h. Furthermore, the immobilization of Ag nanoparticles on the surface of Cys‐HCPPy (Ag@Cys‐HCPPy) enhanced the catalytic properties, which allowed for the reductive decolorization of industrial dyes such as methylene blue, methyl orange, and Congo Red in the presence of NaBH 4 as a reducing agent.