Insight into singlet oxygen generation from metastable lattice of Treated-NaBiO 3 : A mechanism study
Insight into singlet oxygen generation from metastable lattice of Treated-NaBiO 3 : A mechanism study
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DOI：
10.1016/j.matchemphys.2018.03.079
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发表时间：
2018-07
影响因子：
4.6
通讯作者：
Yezhou Hu;Yanfei Huang;Xuehan Wang;Yaobin Ding;Jia Huang
中科院分区：
文献类型：
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作者：
Yezhou Hu;Yanfei Huang;Xuehan Wang;Yaobin Ding;Jia Huang
研究了硝酸处理的NaBiO 3（N-NBO）在降解有机污染物时产生单线态氧（1 O2）的能力，并对其亚稳晶格产生1 O2的机理进行了探讨。结果表明，酸处理使NBO中Bi（V）O 6八面体发生剧烈畸变，形成亚稳态Bi（III）O 6八面体，并以1 O2的形式储存和释放活性氧。表征实验表明，不同的处理方式可以使N-NBO的1 O2生成能力发生活化、失活和再活化，这与活性亚稳Bi（III）O 6八面体的形成、完善和再形成相对应。亚稳结构的形成与N-NBO中Bi ~（5+）向Bi ~（3+）的转化密切相关，亚稳结构的“塌陷”消除了亚稳Bi（III）O ~（6+）八面体“假界面”的活性。这种亚稳结构使活性氧以1 O2的形式从晶格中释放出来，通过金属离子掺杂和碘化物还原可以重建这种亚稳结构，使失活的N-NBO重新活化。通过Bi（V）-Bi（III）的转化和亚稳Bi（III）O 6八面体的形成，提出了1 O2的生成机理。
Nitric acid treated NaBiO3(N-NBO) was observed to have the ability of yielding singlet oxygen (1O2) for degrading organic pollutants, and a mechanism study or insight into1O2generation from metastable lattice of treated-NBO was conducted. It was demonstrated that the acid treatment made Bi(V)O6octahedron in NBO undergo drastic distortion, leading to the formation of a metastable Bi(III)O6octahedron, which could store and release active oxygen as1O2. As confirmed by characterization experiments, the1O2-generating ability of N-NBO could be activated, deactivated and re-activated by different treatments, which corresponded to the formation, consummation and re-formation of the active metastable Bi(III)O6octahedron. The formation of the metastable structure was related closely to the conversion of Bi5+to Bi3+in N-NBO, and its “collapse” eliminated the activity of the metastable Bi(III)O6octahedron “pseudo-interface”. This structure was responsible for the release of active oxygen from the lattice in the form of1O2, and the deactivated N-NBO could be re-activated by re-constructing this metastable structure through metal-ion doping and iodide reduction. A mechanism of1O2generation was proposed by considering the Bi(V)-Bi(III) conversion and the formation of the metastable Bi(III)O6octahedron.