Peroxydisulfate (PDS) is a promising oxidant for sulfate radical based advanced oxidation processes (SAOPs), however its efficient activation is still a challenge. In this study, biochar-supported nano-zerovalent iron (nZVI) and copper oxide (CuO) nanocomposite (nZVI/CuO@BC), derived from low-cost wastes including scrap iron filings, copper leaching solution and corn stalks, was successfully fabricated for PDS activation to enhance tetrabromobisphenol A (TBBPA) degradation in alkaline environment. Under the conditions of 100 mg/L nZVI/CuO@BC, 0.2 mM PDS, pH 8.0 and 25 °C, 86.32% of PDS was activated and 98.46% of TBBPA was degraded within 45 min in nZVI/CuO@BC-activated PDS system. When the PDS concentration was 2 mM, the nZVI/CuO@BC-activated PDS system realized efficient debromination and mineralization of TBBPA at the ratio of 79.12% and 79.36%, respectively. The results of EPR studies and radical scavenger experiments revealed that both hydroxyl radical (·OH) and sulfate radical (SO₄^·-) were responsible for TBBPA degradation. The nZVI could active PDS indirectly through electron transfer mechanism and exhibited synergistic effects with CuO on PDS activation. Furthermore, the nZVI/CuO@BC-activated PDS system showed good potential to degrade TBBPA in real water environment. Therefore, nZVI/CuO@BC could be a novel strategy for efficient PDS activation and TBBPA degradation in alkaline environment.

过氧二硫酸盐（PDS）是基于硫酸根的高级氧化工艺（SAOP）的有前途的氧化剂，但是其有效活化仍然是一个挑战。在这项研究中，成功​​地制造了由低成本废料（包括废铁屑，铜浸出液和玉米秸秆）衍生的生物炭支撑的纳米零价铁（nZVI）和氧化铜（CuO）纳米复合材料（nZVI / CuO @ BC）。用于PDS活化以增强碱性环境中的四溴双酚A（TBBPA）降解。在100 mg / L nZVI / CuO @ BC，0.2 mM PDS，pH 8.0和25°C的条件下，nZVI / CuO @ BC活化的PDS在45分钟内活化了86.32％的PDS，降解了98.46％的TBBPA。系统。当PDS浓度为2 mM时，nZVI / CuO @ BC活化的PDS系统实现了TBBPA的有效脱溴和矿化，比例为79.12％和79.36％，分别。EPR研究和自由基清除剂实验的结果表明，羟基（·OH）和硫酸根（SO₄ ^·-）是TBBPA降解的原因。nZVI可以通过电子转移机制间接激活PDS，并与CuO协同激活PDS。此外，nZVI / CuO @ BC活化的PDS系统在实际水环境中显示出降解TBBPA的良好潜力。因此，nZVI / CuO @ BC可能是在碱性环境中有效激活PDS和TBBPA降解的新策略。