A novel Fe-biochar from polyporaceae for enhancing tetracycline removal in water

Abstract

The production of residues has expanded quickly with the growth of herbal medicine. Chaga mushroom (Inonotus obliquus) is a notable medicinal fungi belonging to the polyporaceae. The Chaga mushroom is a potential raw material for biochar preparation due to its porous structure. In this study, a carbothermic reduction method was used to prepare iron-loading biochar (Fe-BC) from Chaga mushroom residues. The Fe-BC was used as an adsorbent and catalyst to eliminate tetracycline (TC) from water. The specific surface area of the Fe-BC is 473.33 m2/g, and the major pore size of the Fe-BC varied from 0 to 3 nm. The effects of initial concentration, temperature, pH, ionic strength, and water source on TC adsorption were explored. The pseudo-second-order model and Langmuir model can describe the TC adsorption process, and the adsorption is endothermic and spontaneous. The maximum adsorption capacity of the Fe-BC for TC is 183.81 mg/g. The maximum TC removal reached more than 90% when the hydrogen peroxide (H2O2) was added. It can be predicted that high-quality adsorbent and catalyst can be obtained from the residues of polyporaceae for water pollution control.