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Photoactuation Healing of α‐FeOOH@g‐C3N4 Catalyst for Efficient and Stable Activation of Persulfate
Small ( IF 13.0 ) Pub Date : 2017-09-12 , DOI: 10.1002/smll.201702225
Gong Zhang 1, 2 , Zhang Wu 1 , Huijuan Liu 1, 2 , Qinghua Ji 2, 3 , Jiuhui Qu 2, 3 , Jinghong Li 4
Affiliation  

Inspired by living systems, the construction of smart devices that can self‐heal in response to structural damage is a promising technology for maintaining the high activity and stability of catalysts during heterocatalytic reactions. Here this study demonstrates an ingenious platform that enabled efficient persulfate (PS) activation for contaminant degradation via integrating a catalyst with photoactuation regeneration. Under irradiation, it is unambiguously confirmed that the collective properties of a tailored FeOOH@C3N4 catalyst permit interfacial photoexcited electron transport from the photocatalyst substrate to needle‐shaped FeOOH. This results in the simultaneous recovery of Fe(III) and optimization of the Fe(II)/Fe(III) ratio on FeOOH surface during PS activation process, so that the healed chemical structure ensures that subsequent PS activation remains unimpaired. Aqueous organic contaminant (bisphenol A) oxidation efficacy in this system is almost 20 times higher than for photo‐ or Fenton‐oxidation alone. This work highlights the concept of catalyst regeneration for stable reactive species generation in solution, which represents alternative application of photocatalysis for practical environmental remediation. Further, the photoactuation healing approach can be expanded into various domains, such as material fabrication or chemical synthesis.

中文翻译:

α-FeO​​OH@ g-C3N4催化剂的光致活化修复,可有效,稳定地活化过硫酸盐

受生物系统的启发,能够响应结构破坏而自我修复的智能设备的构造是一种有前途的技术,可在杂催化反应过程中保持催化剂的高活性和稳定性。在这里,这项研究展示了一个巧妙的平台,该平台通过将催化剂与光致动再生相结合,能够有效地过硫酸盐(PS)活化以降解污染物。在辐照下,明确确定了定制的FeOOH @ C 3 N 4的集体性质催化剂允许界面光激发电子从光催化剂基质传输到针状FeOOH。这导致在PS活化过程中同时回收Fe(III)并优化FeOOH表面上的Fe(II)/ Fe(III)比,因此经过修复的化学结构可确保随后的PS活化不受影响。该系统中的有机污染物(双酚A)的氧化效率几乎是光氧化或Fenton氧化的20倍。这项工作突出了用于在溶液中稳定生成反应物种的催化剂再生概念,代表了光催化在实际环境修复中的替代应用。此外,光致修复方法可以扩展到各个领域,例如材料制造或化学合成。
更新日期:2017-09-12
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