Tetracycline Degradation by Peroxydisulfate Activated by Waste Pulp/Paper Mill Sludge Biochars Derived at Different Pyrolysis Temperature

The technique of using biochar-based catalysts in persulfate activation is a promising alternative to remov emerging and refractory pollutants (e.g., tetracycline-) wastewater. However, the situation biochars derived from waste pulp/paper mill sludge still unclear. (SBC300, SBC500, SBC700) were obtained characterized at pyrolysis temperatures 300, 500, 700 °C. Tetracycline degradation peroxydisulfate activated by SBCs was investigated. results demonstrated removal efficiencies tetracycline SBC300-, SBC500- SBC700-peroxydisulfate systems, which increased with 4.3, 4.8, 5.0 times that system alone. experiments free radical quenching, singlet oxygen electrochemistry indicated SBC-peroxydisulfate systems mainly not pathway, but non-radical pathway. Singlet (1O2) electron transfer could play main roles tetracycline. be up 96.0% (SBC700-peroxydisulfate) under optimum dosage SBC, molar ratio solution pH value. indicate an effective “trash-to-treasure” treatment for wastewater containing antibiotics.