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Simultaneous Emerging Contaminant Removal and H 2 O 2 Generation Through Electron Transfer Carrier Effect of Bi─O─Ce Bond Bridge Without External Energy Consumption.

Yingtao SunXuanying CaiYufeng LaiChun HuLai Lyu
Published in: Advanced science (Weinheim, Baden-Wurttemberg, Germany) (2024)
Conventional advanced oxidation processes (AOPs) require significant external energy consumption to eliminate emerging contaminants (ECs) with stable structures. Herein, a catalyst consisting of nanocube BiCeO particles (BCO-NCs) prepared by an impregnation-hydrothermal process is reported for the first time, which is used for removing ECs without light/electricity or any other external energy input in water and simultaneous in situ generation of H 2 O 2 . A series of characterizations and experiments reveal that dual reaction centers (DRC) which are similar to the valence band/conducting band structure are formed on the surface of BCO-NCs. Under natural conditions without any external energy consumption, the BCO-NCs self-purification system can remove more than 80% of ECs within 30 min, and complete removal of ECs within 30 min in the presence of abundant electron acceptors, the corresponding second-order kinetic constant is increased to 3.62 times. It is found that O 2 can capture electrons from ECs through the Bi─O─Ce bond bridge during the reaction process, leading to the in situ production of H 2 O 2 . This work will be a key advance in reducing energy consumption for deep wastewater treatment and generating important chemical raw materials.
Keyphrases
  • electron transfer
  • wastewater treatment
  • high resolution
  • nitric oxide
  • risk assessment
  • room temperature
  • drinking water
  • heavy metals