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A novel supramolecular chemosensor (PNG) was successfully constructed by 5-(3-nitrophenyl)-furfural-functionalized Pillar[5]arene(PN) and bipyridine salt(G) via exo-wall π...π interactions. Interestingly, the chemosensor PNG could detect OH− and CO 2 with high selectivity, sensitivity and excellent recyclable properties. The fluorescent detection limits of PNG for OH− and CO 2 are 2.03 × 10−8 M and 9.1 × 10−8 M (2.22 ppm), respectively. The colorimetric detection limits for OH− and CO 2 are 3.78 × 10−8 M and 1.13 × 10−7 M (2.76 ppm), respectively. This study is simple and effective for OH− and CO 2 detection, and provides supramolecular fields with potential practical application in anion and gas detection. Image 1 • Synthesis of a novel arylfurfural functionalized pillar [5]arene (PN). • The PN and G could self-assemble to supramolecular chemosensor PNG by exo-wall π...π interactions. • The PNG shows excellent recyclable dual-channel detections for OH− and CO 2. • PNG -based sequential detection for OH− and CO 2 with high sensitivity and selectivity. [ABSTRACT FROM AUTHOR]