In-situ synthesis of a plasmonic Ag/AgCl/Ag2O heterostructures for degradation of ciprofloxacin
In-situ synthesis of a plasmonic Ag/AgCl/Ag2O heterostructures for degradation of ciprofloxacin
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DOI：
10.1016/j.apcatb.2016.10.013
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发表时间：
2017-05
影响因子：
22.1
通讯作者：
Songbo Yang;Dongbo Xu;Biyi Chen;Bifu Luo;W. Shi
中科院分区：
文献类型：
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作者：
Songbo Yang;Dongbo Xu;Biyi Chen;Bifu Luo;W. Shi
环丙沙星（CIP）对传统的废水处理方法具有很强的耐受性，造成了严重的环境问题。为了提高CIP的光降解效率，通过在Ag 2 O纳米粒子表面生长Ag/AgCl，发展了一种新的Ag/AgCl/Ag 2 O体系。稳定的Ag/AgCl纳米壳层可以有效地保护内部Ag 2 O免受光催化过程中的光腐蚀，提高光生电子-空穴对的分离和转移效率。在可见光照射下（λ > 420 nm），50%Ag/AgCl/Ag 2 O异质结构对CIP的最佳光催化降解效率分别是单独Ag 2 O和Ag/AgCl的2.9倍和3.73倍。自由基捕获实验表明，CIP的降解主要是由超氧自由基（O2−radical dot）的参与和空穴（h+）的作用驱动的。从实验结果和这些半导体的相对带隙位置，提出了一个可能的Z-计划光催化机制。该体系大大克服了单一组分Ag 2 O的缺点，实现了强氧化还原能力和长期稳定性。
Ciprofloxacin (CIP) has caused serious environmental problems because of its high resistance to conventional wastewater treatments methods. To improve the photodegradation efficiency for CIP, a new system of Ag/AgCl/Ag2O is developed by growth of Ag/AgCl on the surface of Ag2O nonoparticles at room temperature. The stable Ag/AgCl nanoshells could efficiently protect inner Ag2O from photocorrosion during the photocatalytic process and enhance the separation and transfer efficiency of photo-induced electron–hole pairs. The optimum photocatalytic efficiency of 50% Ag/AgCl/Ag2O heterostructures for the degradation of CIP under visible light irradiation (λ > 420 nm) was about 2.9 and 3.73 times higher than that of individual Ag2O and Ag/AgCl, respectively. The radical trap experiments showed that the degradation of CIP was driven mainly by the participation of superoxide radical (O2−radical dot) and the action of holes (h+). From the experimental results and the relative band gap position of these semiconductors, a possible Z-scheme photocatalytic mechanism was proposed. The system has greatly overcome the drawbacks of single component Ag2O and realized the strong redox ability and long-term stability.