研究报告
游霞,肖芳芳,程建华,杨草,胡勇有.VUV/HPW/BMMs体系对全氟辛酸（PFOA）的脱氟研究[J].环境科学学报,2017,37(11):4064-4070
VUV/HPW/BMMs体系对全氟辛酸（PFOA）的脱氟研究
- Defluorination of aqueous perfluorooctanoic acid by combination of vacuum ultraviolet and bimodal mesoporous materials supported phosphotungstic acid catalyst
- 基金项目：国家自然科学基金（No.U1401235）；广东省应用型科技研发项目（No.2016B020240005）；中央高校基本科研业务费专项资金（No.D2172600）
- 作者
- 单位
- 游霞
- 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
- 肖芳芳
- 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
- 程建华
- 1. 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006;2. 华南理工大学华南协同创新研究院, 东莞 523808
- 杨草
- 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
- 胡勇有
- 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
- 摘要：采用真空紫外灯（VUV）和双模型介孔材料（BMMs）负载磷钨酸（HPW）催化剂构建光催化体系，探究该体系对水中全氟辛酸（PFOA）的脱氟效果.研究了PFOA初始浓度、HPW/BMMs投加量、初始pH值对体系脱氟的影响，并采用响应曲面法（Response Surface Method，RSM）分析了最佳边界反应条件.结果表明，体系对PFOA具有明显的脱氟效果：脱氟效率随PFOA初始浓度的增大而减小；催化剂投加量为0.2 g·L-1，脱氟效率最高达50.2%；体系pH为3~4时，体系脱氟效果显著.基于Box-Behnken 响应曲面法，各影响因子对脱氟效率的显著性排序为：pH>PFOA初始浓度>HPW/BMMs投加量.pH值与HPW/BMMs投加量及初始PFOA浓度交互作用显著，模型回归性良好，最佳运行条件为：pH=3.82，HPW/BMMs投加量为0.3 g·L-1，PFOA初始浓度为20 mg·L-1，反应4 h的脱氟率达到52.6%，与预测值相比偏差为1.2%.本研究为高效降解全氟化合物提供了新思路.
- Abstract：A combined process of vacuum ultraviolet (VUV) and the catalyst prepared by supporting phosphotungstic acid (HPW) on bimodal mesoporous SiO2 (BMMs) was built to explore the defluorination of aqueous perfluorooctanoic acid (PFOA). The effect of PFOA concentration, HPW/BMMs dosage and solution pH on the defluorination of the photocatalytic system were discussed, and the response surface orthogonal test (RSM) was used to optimize and analyze the optimal reaction conditions. The results indicate that the degradation of PFOA improved significantly in the system under low PFOA concentration, dosage of the catalyst (0.2 g·L-1) and pH 3~4. Based on the Box-Behnken response surface method, the significance of each influencing factor was pH > PFOA initial concentration > HPW/BMMs dosage. The synergetic effect of pH with HPW/BMMs dosage and PFOA concentration on defluorination were all significant. The optimum operating conditions are pH 3.82, HPW/BMMs dosage of 0.3 g·L-1 and initial PFOA concentration of 20 mg·L-1, and the defluorination rate of the reaction was up to 52.6% after 4 h radiation. The predicted values agreed well with the experimental values with only 1.2% deviation.
- Key words：perfluorooctanoic acid phosphotungstic acid bimodal mesoporous materials vacuum ultraviolet response surface method defluorination rate
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