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A micro-packed bed reactor has been developed to demonstrate aerobic oxidation of alcohols to aldehydes, utilizing green oxidant O2 and effective Cu/TEMPO-catalyzed system.

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BACKGROUND Macroalgae biomass as a graphene source shows great potential at large scale in an energy shortage era. To achieve a more moderate and economic graphene synthesis method, porous graphenes were synthesized using Sargassum horneri as precursor, in combination with Fe(NO3)3 and KOH composite. RESULTS The addition of 10 wt% Fe(NO3)3 obviously accelerated KOH activation and decreased KOH loading and reaction temperature. Meanwhile, the graphene synthesized by Fe(NO3)3/KOH had better regeneration performance than that activated merely by KOH, even under more moderate thermal condition. The porous graphene displayed high specific surface area (~2311 m2 g−1) and exhibited good CO2 uptake capacity (~4.39 mmol g−1) at 30 °C and 1 bar. The CO2 adsorption rate equations of the graphene were consistent with the intraparticle diffusion model, indicating that CO2 adsorption was mainly controlled by the pore structure and additionally influenced by the chemical functional groups. CONCLUSION The present work focuses on the high value‐added comprehensive utilization of macroalgae, which not only has important significance for on‐scale preparation of bio‐originated graphene and CO2 adsorption, but also has positive benefits for macroalgae resource development. © 2022 Society of Chemical Industry (SCI).

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Today, the Al2O3-supported catalyst in the heterogeneous catalytic ozonation system attracts attention due to its stable structure and relatively high surface activity. Herein, Mn and Cu oxides loaded on γ-Al2O3 pellets were prepared using an impregnation method to improve the removal efficiency in a micropacked bed reactor (μPBR). The effects of the initial pH, the ratio of O3 to chemical oxygen demand (COD), and HO• scavenger on the catalytic performance were investigated. Experimental results showed that the MnO2/γ-Al2O3 and CuO/γ-Al2O3 catalysts exhibited excellent catalytic performance. The COD removal efficiencies were 86.3% for CuO/Al2O3, 76.9% for MnO2/Al2O3, 71.6% for Al2O3, and 35.8% for ozone alone within 71 s. Compared with those of batch reactors, the apparent degradation rate constant of COD with prepared catalysts in a μPBR increased by 2–3 orders of magnitude. In addition, the CuO/γ-Al2O3 catalyst maintained a relatively stable activity in the continuous flow test for a long time (100 h). Finally, some typical antibiotics were treated by catalytic ozonation in a μPBR. The removal efficiencies of these antibiotics and COD reached approximately 100.0% and 62.9–87.8% within 71 s, respectively. Thus, the continuous catalytic ozonation system with the CuO/γ-Al2O3 catalyst based on μPBRs could be a promising pathway for the treatment of industrial wastewater with antibiotics.

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