Institute of Ecological and Environmental Sciences;
Sichuan Agricultural University;
Chengdu 611130;
China;
Rural Environment Protection Engineering&Technology Center of Sichuan Province;
Sichuan Agricultural University;
Chengdu 611130;
China;
Key Laboratory of Development and Application of Rural Renewable Energy;
Biogas Institute of Ministry of Agriculture and Rural Affairs;
Chengdu 610041;
China;
Chemical and Petroleum Engineering;
Schulich School of Engineering;
the University of Calgary;
Calgary T2N4H9;
Canada;
Biochar; Oxidative modification; Phosphoric acid; Hydrogen peroxide; Oxygenated functional groups;