4.7 Article

Improving photocatalytic activity under visible light over a novel food wastes biochar-based BiOBr nanocomposite

Journal

CHEMOSPHERE
Volume 297, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.134152

Keywords

Carbonaceous material; Photodegradation; Oxygen functional groups; Persistent free radicals

Funding

  1. Research Project of Shanxi Provincial Department of Science and Technology [202003D311001]
  2. National Key R&D Program of China [2019YFC0408605]
  3. National Natural Science Foundation of China [U1701243]

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This study utilized biochar derived from food wastes to construct C/BiOBr composites for photocatalytic degradation of water pollutants. The photocatalytic performance was significantly improved by choosing the appropriate carbonization temperature and adjusting the content of C. The smooth structure and surface properties of 400C played a crucial role in enhancing the photocatalytic activities.
Biochar (C) applied in synthesizing photocatalysts to eliminate water pollution has been intensively investigated. Herein we report the first use of biochar pyrolyzed from food wastes at 400 C (400C) and 700 C to construct C/ BiOBr composites via a facile hydrolysis approach. Photocatalytic performances could be significantly improved by choosing the appropriate carbonization temperature and adjusting the content of C in C/BiOBr composites. The prepared 1%400C/BiOBr exhibited the best photodegradation capacity towards methylene orange (20 mg/ L) and tetracycline (50 mg/L). A series of characterization results illustrated that smooth structure and surface properties (oxygen functional groups and persistent free radicals) of 400C played an important role in enhancing the photocatalytic activities. Mechanism exploration suggested that h(+) and O-2(-)& nbsp;were the main active species thus contributing to photodegradation. This study provided a new insight into utilization of biochar derived from food wastes in photocatalysis and environmental remediation.

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