“…Biochar has different purposes, with some of these being the reduction in greenhouse gases, metal immobilization, nutrient exchange, the reduction and removal of organic and inorganic compounds in water, and carbon sequestration [7]. The use of modified biochar is also a topic of increasing interest among the scientific community, especially its modification to be used as a supporting material for iron (Fe) in heterogeneous Fenton processes, allowing the activation of hydrogen peroxide (H 2 O 2 ), and in persulfatebased oxidation processes, enabling that of persulfate (S 2 O 8 2− ) [8][9][10]. When biochar is used as a supporting material for Fe, the Fe-modified biochar can be used as a catalyst in the treatment of organic pollutants contained in water like emerging pollutants, dyes, and heavy metals [11][12][13][14][15].…”