Cow dung-derived biochars engineered as antibacterial agents for bacterial decontamination


Ying Liu , Quanfu Yao , Qinggele Borjihan , Huihui Qu , Yixuan Guo , Ziying Zhao , Long Qiao , Ting Li , Alideertu Dong

DOI:10.1016/j.jes.2020.12.022

Received September 05, 2020,Revised , Accepted December 17, 2020, Available online January 12, 2021

Volume 33,2021,Pages 33-43

Disposal of the pollutants arising from farming cattle and other livestock threatens the environment and public safety in diverse ways. Herein, we report on the synthesis of engineered biochars using cow dung as raw material, and investigating these biochars as antibacterial agents for water decontamination. By coating the biochars with N-halamine polymer and loading them with active chlorine (i.e., Cl+), we were able to regulate them on demand by tuning the polymer coating and bleaching conditions. The obtained N-halamine-modified biochars were found to be extremely potent against Escherichia coli and Staphylococcus aureus. We also investigated the possibility of using these N-halamine-modified biochars for bacterial decontamination in real-world applications. Our findings indicated that a homemade filter column packed with N-halamine-modified biochars removed pathogenic bacteria from mining sewage, dairy sewage, domestic sewage, and artificial seawater. This proposed strategy could indicate a new way for utilizing livestock pollutants to create on-demand decontaminants.

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