摘要：

以双酚A（BPA）为目标污染物，以玉米秸秆和磷酸三丁酯为原料，通过浸渍热解法制备出磷掺杂生物炭（P-bio），对P-bio的结构进行了表征分析，进一步探讨了过硫酸盐（PMS）浓度、P-bio投加量和初始pH等因素对P-bio活化PMS降解BPA效能的影响。结果表明，P-bio表面为由明显褶皱组成的片状结构，呈现多孔且疏松的状态；P-bio的比表面积为173.985 m²/g，相比原始生物炭（1.863 m²/g）提高了93.4倍。在BPA质量浓度为10 mg/L、P-bio投加量为2 g/L、pH为3.21、PMS投加量为2 mmol/L条件下，反应30 min后P-bio活化PMS体系对BPA的去除率为99.47%，反应速率常数为0.164 3 min^-1。进一步通过EPR猝灭实验证实，在P-bio活化PMS体系中产生了SO₄ ^·-和·OH，两种活性自由基对BPA降解的贡献率分别为12.07%和87.93%。对P-bio重复利用，第2次使用时BPA去除率为74.1%，第3次使用时BPA去除率为68%，连续使用3次后对P-bio进行煅烧，BPA去除率恢复至80.7%，说明P-bio催化剂具有较强的可重复利用性和再生性能。

关键词: 过硫酸盐, 内分泌干扰物, 改性生物炭, 双酚A, 磷掺杂

Abstract:

Using bisphenol A(BPA) as the target pollutant, phosphorus-doped biochar(P-bio) was prepared by impregnation pyrolysis with corn stover and tributyl phosphate as the raw materials. The structure of P-bio was characterized and analyzed, and the effects of persulfate(PMS) concentration, P-bio dosage, and initial pH on BPA degradation by P-bio activated PMS system were further explored. The results indicated that the surface of P-bio was a sheet-like structure composed of obvious folds, which was porous and loose. The specific surface area of P-bio was 173.985 m²/g, which was 93.4 times higher than that of pure biochar(1.863 m²/g). Under the conditions of BPA concentration of 10 mg/L, P-bio dosage of 2 g/L, pH of 3.21, and PMS dosage of 2 mmol/L, the removal rate of BPA by P-bio activated PMS system was 99.47% after 30 minutes, and the reaction rate constant was 0.164 3 min^-1. It was further confirmed by EPR quenching that active radicals SO₄ ^·- and ·OH were generated in the P-bio activated PMS system, which contributed to the degradation of BPA by 12.07% and 87.93%, respectively. For the reuse of P-bio, BPA removal rate was 74.1% at the 2nd use and 68% at the 3rd use, and BPA removal rate recovered to 80.7% after calcination of P-bio after three consecutive uses, which indicated that the P-bio catalyst had strong reusability and regeneration performance.

Key words: persulfate, endocrine disruptor, modified biochar, bisphenol A, phosphorus doping

中图分类号: 

• X703