Synthesis and boosting visible light photoactivity of Ag@AgI/CdWO4 towards refractory organic pollutants degradation based on interfacial charge transfer
Synthesis and boosting visible light photoactivity of Ag@AgI/CdWO4 towards refractory organic pollutants degradation based on interfacial charge transfer
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基于界面电荷转移的Ag@AgI/CdWO4的合成和增强可见光光活性以降解难降解的有机污染物
DOI：
10.1016/j.apsusc.2018.05.163
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发表时间：
2018-10
影响因子：
6.7
通讯作者：
Mo Dan
中科院分区：
文献类型：
--
作者：
Yuan Xingzhong;Wu Zhibin;Zeng Guangming;Jiang Longbo;Zhang Jin;Xiong Ting;Wang Hou;Mo Dan
采用原位沉积-沉淀法和光还原法制备了高可见光活性的Ag@AgI/CdWO 4（AICW）光催化剂。通过多种技术手段对合成的纳米晶的晶相、形貌、化学组成、光学性质等进行了表征。结果表明，CdWO 4（CW）纳米棒与Ag@AgI（Al）颗粒之间的界面相互作用增强了可见光捕获，提高了比表面积，促进了光生载流子的分离和转移，延长了光电子寿命。AICW-3对罗丹明B（RhB）和四环素（TC）的降解率分别为99.3%（24 min）和77.0%（20 min），光催化效率分别是Al的2.43倍和2.61倍，具有较高的可重复使用性。自由基捕获和电子自旋共振（ESR）实验表明，自由基dotO 2-、h+和dotOH是RhB和TC降解的主要自由基.据此，提出了可见光照射下RhB和TC降解过程中光诱导载流子的迁移和分离以及自由基产生的可能机制，以期为环境修复技术的进一步发展奠定基础。
The high visible light active photocatalysts of Ag@AgI/CdWO4(AICW) were synthesized via in situ deposition–precipitation and photoreduction methods. The physicochemical properties of crystal phases, morphologies, chemical compositions, optical properties and so on were characterized via several techniques. The results shown that the interface interaction between CdWO4(CW) nanorods and Ag@AgI (AI) particles would enhance the visible light trapping, improve the surface area, promote the separation and transfer of photogenerated charge carrier and prolong the photoelectron lifetime. The AICW–3 with considerable reusability exhibited the optimum synergism of visible light photoactivity towards rhodamine B (RhB) and tetracycline (TC) degradation, in which the RhB and TC degradation ratio is 99.3% (24 min) and 77.0% (20 min), respectively, and the photocatalytic rate is 2.43 and 2.61 times that of AI, respectively. Furthermore, the free radical capture and electron spin resonance (ESR) experiments indicated that theradical dotO2−, h+andradical dotOH species were the main radicals for RhB and TC degradation. Accordingly, the possible mechanisms of transfer and separation of photoinduced carriers as well as the generation of radicals for RhB and TC decomposition under visible light irradiation were proposed to lead the further improvement in environment remediation.
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