期刊文献+

紫外降解双酚A的因素敏感性分析及机理探讨 被引量:5

Factor Sensitivity Analysis and Mechanisms Investigation of Bisphenol A Photodegradation in Water by UV Irradiation
下载PDF
导出
摘要 以光强(A)、双酚A的初始浓度(B)、pH(C)及转速(D)为变量,设计了4因素4水平的正交试验L_(16)(4~4)以考察水溶液中双酚A紫外降解的因素敏感情况,并初步探讨了其降解机理。实验结果表明,在所研究的范围内,各因素对双酚A紫外降解的敏感程度排序为:A>B>C>D;其中,光强与双酚A的初始浓度对污染物的降解速率的影响非常显著(p<0.05),而pH与转速几乎不产生影响(p>0.05)。以高效液相色谱的谱图为基础,水溶液中双酚A紫外光解的路径受反应条件特别是溶液pH值的影响。碱性条件下(pH=11)以离子形态存在的双酚A与水溶液光解产生的自由基结合形成·OH-双酚A并进一步发生取代或开环反应,酸性或中性条件下双酚A在自由基作用的情况下分解生成苯酚(t_r=4.516 min);并通过标准物质定性推断了可能的中间产物。 To investigate the factor sensitivity and mechanisms in the photodegradation of bisphenol A (BPA) by UV irradiation, the UV radiant intensity (A), the initial BPA concentration (B), pH (C) and rotation rate (D) were selected as four factors, and every factor had four variable levels for the design of orthogonal test. In the researched scope of each factor, the order of the factor sensitivity for the BPA degradation rate was A〉B〉C〉D, using the extremum difference method and the anal- ysis of variance (ANOVA). Among these factors, the effect of UV radiant intensity and the initial BPA concentration was significant and had control effect on BPA degradation (p〈0.05), while pH and the rotation rate had little effect on the degrada- tion rate of BPA (p〉0.05). In combination with the HPLC spectrum, the possible degradation pathways were deduced and the mechanism was especially affected by the pH value of BPA solution in this study. Concretely, BPA reacted with the radicals produced by the UV radiation to form OH-BPA in alkaline solutions (pH=11); and under acid or neutral conditions BPA was decomposed to phenol by these radicals directly. Main intermediates were deduced through the confirmation of the standard substance.
作者 李红娜 郭萍 汪煜 叶婧 朱昌雄 LI Hongna GUO Ping WANG Yu YE Jing ZHU Changxiong(Agricultural Clear Watershed Group, Institute of Environment and Sustainable Development in Agriculture, CAAS, Beijing 100081, China)
出处 《环境科学与技术》 CAS CSCD 北大核心 2017年第6期1-6,共6页 Environmental Science & Technology
基金 国家自然科学基金(51308537)
关键词 双酚A 紫外降解 敏感性 降解机理 bisphenol A photodegradation by UV irradiation sensitivity degradation mechanism
  • 引文网络
  • 相关文献

参考文献8

二级参考文献78

共引文献224

同被引文献44

引证文献5

二级引证文献23

;
使用帮助 返回顶部