4.7 Review

Hydrochar and pyrochar for sorption of pollutants in wastewater and exhaust gas: A critical review

Journal

ENVIRONMENTAL POLLUTION
Volume 268, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2020.115910

Keywords

Biochar; Hydrochar; Hydrothermal conversion; Pollutant sorption; Wastewater; Exhaust gas

Funding

  1. National Natural Science Foundation of China [51861125103]
  2. Beijing Dairy Industry Innovation Team [BAIC06-2020]
  3. Fundamental Research Funds for the Central Universities, CAU [2020TC160]

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Biochar, a sustainable adsorbent derived from abundant bio-wastes, can be used for the sorption of pollutants in wastewater and exhaust gases. This study compares and discusses the adsorption performance of pyrochar and hydrochar, including preparation procedures, sorption mechanisms, and physiochemical properties. Challenges and perspectives for designing efficient and environmentally friendly biochar-based adsorbents are also addressed.
Pollutants in wastewater and exhaust gas bring out serious concerns to public health and the environment. Biochar can be developed as a sustainable adsorbent originating from abundant bio-wastes, such as agricultural waste, forestry residue, food waste and human waste. Here we highlight the state-of-the-art research progress on pyrochar and hydrochar for the sorption of pollutants (heavy metal, organics, gas, etc) in wastewater and exhaust gases. The adsorption performance of pyrochar and hydrochar are compared and discussed in-depth, including preparation procedures (carbonization and activation), sorption possible mechanisms, and physiochemical properties. Challenges and perspective for designing efficient and environmental benign biochar-based adsorbents are finally addressed. (C) 2020 Elsevier Ltd. All rights reserved.

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