Figure 3.

Continuous‐flow nanocatalysis by the AuNP‐anchored paper reactors. Typical reactor setup using a packed syringe containing the AuNP‐anchored paper reactor (a) and a syringe pump (b) for aqueous room‐temperature reduction of 4‐nitrophenol to 4‐aminophenol. c) UV/Vis absorption spectra of a 50 μm 4‐nitrophenol solution with 50 mm NaBH₄ before (solid line) and after (dotted line) feeding into the AuNP‐anchored paper reactor with micro/nanoscale pores at 0.05 mL min⁻¹. d) 4‐Nitrophenol conversion versus feed rate for AuNP‐anchored paper reactors containing different porous structures. e) TOF value versus feed rate for state‐of‐the‐art flow reactors in the 4‐nitrophenol reduction. f) Relative TOF versus reuse number for the AuNP‐anchored paper reactor with micro/nanoscale pores. Au catalyst content in the paper reactor: 0.45 μmol per 110 mm³ (microscale pores, nanoscale pores) and 0.30 μmol per 110 mm³ (micro/nanoscale pores).