研究报告
徐闻欣,吴俊峰,邢俊明,龚庆,聂慧,王松林.羟胺强化亚铁活化过硫酸盐降解对乙酰氨基酚的研究[J].环境科学学报,2019,39(10):3410-3417
羟胺强化亚铁活化过硫酸盐降解对乙酰氨基酚的研究
- Degradation of acetaminophen by hydroxylamine enhanced Fe2+/persulfate system
- 基金项目:国家重点研发计划项目(No.2018YFC1901403)
- 徐闻欣
- 华中科技大学环境科学与工程学院, 武汉 430074
- 吴俊峰
- 中国市政工程中南设计研究总院有限公司, 武汉 430010
- 邢俊明
- 中国市政工程中南设计研究总院有限公司, 武汉 430010
- 龚庆
- 华中科技大学环境科学与工程学院, 武汉 430074
- 聂慧
- 华中科技大学环境科学与工程学院, 武汉 430074
- 王松林
- 华中科技大学环境科学与工程学院, 武汉 430074
- 摘要:采用羟胺(HA)强化Fe2+/过硫酸盐(PS)体系降解对乙酰氨基酚(ACT),考察了Fe2+、PS、HA投加浓度以及反应初始pH值对ACT降解效果的影响.结果表明,在反应时间为30 min,亚铁浓度为0.05 mmol·L-1,PS浓度为0.8 mmol·L-1和初始pH为3.0的条件下,0.5 mmol·L-1 HA可将ACT的去除率从13%提高到90%.适量增加Fe2+或HA浓度可以提高ACT的降解率,但是过高的Fe2+和HA浓度会抑制ACT的降解.ACT的降解率随着PS浓度升高而提升,当PS浓度达到1.2 mmol·L-1时,30 min内ACT几乎可以完全降解.ACT的降解效果随着pH的升高而降低.EPR实验表明Fe2+/PS/HA体系中主要的自由基是SO4·-和HO·.Na2SO3、NaNO2和Na2S2O3等常见的还原剂均能够强化Fe2+/PS体系对ACT的降解效果,但是其对Fe2+/PS体系的强化效果均比HA低.
- Abstract:Hydroxylamine(HA) could greatly enhance the degradation of acetaminophen(ACT) in Fe2+/persulfate(PS) system. factors that may influence on degradation performance, such as the initial pH, and the dosageof hydroxylamine, Fe2+, and persulfate were investigated. The results show that 0.5 mmol·L-1 HA could increase the removal rate of ACT from 13% to 90% in 30 min under the conditions of 0.05 mmol·L-1 of ferrous iron, 0.8 mmol·L-1 of PS and initial pH 3.0. An appropriate increase of Fe2+,HA and PS concentration could improve, but excessive Fe2+ and HA would inhibit ACT degradation. When PS concentration reached 1.2 mmol·L-1, ACT could be almost completely degraded within 30 min. The degradation rate of ACT decreased with the increase of pH. The EPR experiment results show that the major reactive radicals in Fe2+/PS/HA system were SO4·- and HO·. Some common reducing agents such as Na2SO3, NaNO2 and Na2S2O3 could enhance the degradation of ACT in Fe2+/PS system, but their enhancement effect was lower than that of hydroxylamine.