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Water pollution is a serious environmental problem with the rapid development of industry. Organic dyes are an important factor in water pollution. Herein, we design and synthesize a conjugated microporous polymer (CMP) based on triethynylbenzene and dibromohydroquinone (CMP-O) and the quaternary ammonium group-modified product CMP-N. CMP-N shows a low specific surface area of 0.049 cm3/g and low porosity. While CMP-N shows strong dispersity in water, CMP-N exhibits rapid adsorption of anionic dye, especially acid blue 93 (497 mg/g). This research is the first time to provide the alkyl quaternary ammonium group-modified microporous polymer in dye adsorption.

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