| 铋银氧化物混合物高效氧化降解四溴双酚A的研究 |
| 摘要点击 2055 全文点击 1689 投稿时间：2014-05-30 修订日期：2014-07-25 |
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| 中文关键词 铋银氧化物混合物 四溴双酚A 单线态氧 氧化降解 矿化 |
| 英文关键词 silver bismuth oxide tetrabromobisphenol A singlet oxygen oxidative decomposition mineralization |
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| 中文摘要 |
| 以AgNO3和NaBiO3·2H2O为原料,采用离子交换-共沉淀法制备了铋银氧化物混合物(silver bismuth oxide,BSO),并利用它氧化降解溴代阻燃剂四溴双酚A(TBBPA). 研究了制备过程中银铋摩尔比及降解过程中BSO用量对TBBPA降解效果的影响. 结果表明,当银铋摩尔比为1:1,BSO用量为1 g·L-1时,40 mg·L-1 TBBPA在7 min内可完全降解,其总有机碳的去除率高达80%. 采用离子色谱、气相色谱-质谱联用仪及X射线光电子能谱监测降解过程中TBBPA的变化,发现TBBPA降解过程涉及脱溴、叔丁基碳的断裂和苯环的开环氧化等反应. 利用NaN3作为分子探针,发现单线态氧是BSO氧化降解TBBPA的主要反应活性物种. |
| 英文摘要 |
| Silver bismuth oxide(BSO)was prepared by a simple ion exchange-coprecipitation method with AgNO3 and NaBiO3·2H2O as raw materials, and then used to oxidatively degrade tetrabromobisphenol A(TBBPA). Effects of the molar ratio of Ag/Bi during BSO preparation and the BSO dosage on the degradation of TBBPA were investigated. The results showed that under the optimized conditions(i. e., the Ag/Bi molar ratio of 1:1, BSO dosage of 1 g·L-1), 40 mg·L-1 of TBBPA was completely degraded and the removal of total organic carbon achieved more than 80% within 7 min. The degradation intermediates of TBBPA were identified by ion chromatography, gas chromatograph-mass spectrometer and X-ray photoelectron spectroscopy. The degradation pathway of TBBPA included the debromination, the cleavage of tert-butyl group and the open epoxidation of benzene ring. Based on a quenching study of NaN3, singlet oxygen was proved to play a dominant role in the TBBPA degradation. |
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