Study on copper oxide modified biochar for activating persulfate high efficiency and application for the removal of bisphenol A

Advanced oxidation based on persulfate applied for the removal of organic pollutants has received widespread attention. Here, combining hydrothermal synthesis and a high-temperature calcination approach, we constructed an effective copper oxide-modified biochar from wood waste (Ginkgo biloba rods) for the removal of bisphenol A (BPA) from contaminated waterways. The modified biochar with copper oxide in its structure (CuO/BC) exhibited a densely arranged needle-shaped structure different from pristine timber waste biochar (BC). CuO/BC can activate persulfate efficiently, and the removal rate of BPA could reach 100% within 20-30 min, approximately three times higher than that of BC. Moreover, CuO/BC was more suitable for treating BPA wastewater under alkaline conditions. The stability of CuO/BC, reaction intermediates, and possible degradation pathway were investigated. These results demonstrate the potential of the application of CuO/BC for organic wastewater treatment and shed light on a new approach to develop wastewater treatment materials that are carbon-based and cost-effective.