摘要:
以玉米秸秆为原料制备生物炭(BC),然后以磷酸为改性剂制备磷改性生物炭(PBC),并采用液相还原法成功制备生物炭负载纳米零价铁复合材料(nZVI@PBC)。通过批次实验探究了不同铁碳比、反应体系、催化剂投加量、过一硫酸盐(PMS)投加量和溶液初始pH对双酚A(BPA)降解效果的影响。结果表明:铁碳比为1∶1的复合材料nZVI@PBC11能高效活化PMS,对BPA的降解效果最佳;与nZVI、PMS、nZVI@PBC11、nZVI/PMS反应体系相比,nZVI@PBC11/PMS反应体系对BPA的降解效果最优,且反应过程符合准一级反应动力学模型;在nZVI@PBC11催化剂投加量0.2 g/L、PMS投加量2.0 mmol/L、pH=3条件下反应40 min,BPA降解率达到99.4%,降解反应速率常数k为0.209 min-1。nZVI@PBC11催化剂具有良好的稳定性,循环使用3次后BPA降解率仍可达到74.9%。电子顺磁共振和自由基猝灭实验结果表明,nZVI@BC11/PMS反应体系对BPA的降解存在自由基(SO4 ·-、·OH、O2 ·-)和非自由基(1O2)两种途径,且以1O2、O2 ·-和SO4 ·-的贡献为主。该研究为高级氧化法降解水中有机污染物提供技术支撑。
关键词:
磷酸改性生物炭,
纳米零价铁,
过一硫酸盐,
双酚A,
降解机理
Abstract:
Phosphorus-modified biochar(PBC) was synthesized using corn straw as raw material and phosphoric acid as modifier. Biochar supported by nanoscale zero-valent iron composite (nZVI@PBC) was successfully prepared via a liquid-phase reduction method. Batch experiments were conducted to investigate the effects of various iron-to-carbon ratios, reaction systems, catalyst dosages, peroxymonosulfate(PMS) concentrations and initial solution pH on the degradation of bisphenol A (BPA). The results indicated that the composite nZVI@PBC11 (iron-to-carbon ratio of 1∶1) exhibited optimal performance in activating PMS and degrading BPA. Compared with the nZVI, PMS, nZVI@PBC11 and nZVI/PMS reaction systems, the nZVI@PBC11/PMS reaction system had the best degradation effect on BPA, and the reaction process conformed to the quasi-first-order reaction kinetics model. Under conditions of 0.2 g/L nZVI@PBC11 catalyst dosage, 2.0 mmol/L PMS and initial pH of 3, the BPA degradation rate reached 99.4% within 40 minutes, with a reaction rate constant k of 0.209 min-1. The nZVI@PBC11 catalyst had good stability and the degradation rate of BPA could still reach 74.9% after 3 cycles. The results of electron paramagnetic resonance and free radical quenching experiments revealed that the degradation of BPA by the nZVI@BC11/PMS reaction system followed radical (SO4 ·-, ·OH, O2 ·-) and non-radical (1O2) pathways, with 1O2, O2 ·- and SO4 ·- being the predominant contributors. This study provides technical support for the advanced oxidation method to degrade organic pollutants in water.
Key words:
phosphoric acid modified biochar,
nanoscale zero-valence iron,
peroxymonosulfate,
bisphenol A,
degradation mechanism
中图分类号:
伍传田, 陈奕洁, 林超敏, 李章良, 杨月珠, 吕源财. 生物炭负载纳米零价铁活化过一硫酸盐降解双酚A[J]. 工业水处理, 2025, 45(11): 165-173.
Chuantian WU, Yijie CHEN, Chaomin LIN, Zhangliang LI, Yuezhu YANG, Yuancai LÜ. Biochar loaded nanoscale zero-valent iron activated peroxymonosulfate for the degradation of bisphenol A[J]. Industrial Water Treatment, 2025, 45(11): 165-173.