Co-doped MgAl-LDHs nanosheets supported Au nanoparticles for complete catalytic oxidation of HCHO at room temperature
Co-doped MgAl-LDHs nanosheets supported Au nanoparticles for complete catalytic oxidation of HCHO at room temperature
复制标题
共掺杂 MgAl-LDHs 纳米片负载 Au 纳米粒子，可在室温下完全催化氧化 HCHO
DOI：
10.1016/j.apsusc.2019.05.083
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发表时间：
2019-09-01
影响因子：
6.7
通讯作者：
Liu, Shengwei
中科院分区：
文献类型：
--
作者：
Li, Shuping;Ezugwu, Chizoba I.;Liu, Shengwei
甲醛（HCHO）仍然是主要的有害挥发性有机化合物（VOC），危害人类健康，特别是在室内，因此其有效消除对于保证室内空气质量具有重要意义。制造在室温下完全氧化去除 HCHO 且不产生二次污染的强效催化剂是非常理想但具有挑战性的。在本报告中，通过在预成型的 Co-LDH 纳米片上原位沉积均匀的 Au 纳米颗粒，制备了 Au 装饰的钴（Co）掺杂 Mg/Al 层状双氢氧化物（x%Au/Co-LDH）。相对于没有 Co 掺杂的二元 2%Au/LDH 样品和其他对照样品，优化负载量为 2 wt%（2%Au/Co-LDH）的 x%Au/Co-LDH 催化剂在将室内 HCHO 完全氧化为 CO2 方面表现出优异的活性。基于系统表征，有人认为，共掺杂、修饰的 Au NP 和丰富的羟基的协同作用是在环境温度下有效去除超过 2%Au/Co-LDH 的氧化 HCHO 的原因。特别是，有人提出，Co掺杂有利于Au在具有强电子相互作用的Co-LDH上沉积，这将有利于室温下氧的吸附和活化。这项研究不仅有助于进一步开发新型催化剂，以在室温下有效催化 HCHO 氧化，而且还为氧化 HCHO 去除机制提供新的见解。
Formaldehyde (HCHO) still remains the predominant pernicious volatile organic compound (VOC), endangering human health particularly in the room, thus its efficient elimination is of great importance to guarantee indoor air quality. It is highly desirable but challenging to fabricate robust catalyst for complete oxidative HCHO removal at room temperature without secondary pollution. In this report, Au decorated cobalt(Co)-doped Mg/Al layered double hydroxide (x%Au/Co-LDH) were prepared by in-situ deposition of uniform Au nanoparticles on preformed Co-LDH nanosheets. The x%Au/Co-LDH catalyst with optimized loading amount of 2 wt%(2%Au/Co-LDH) exhibited superior activity for complete oxidation of indoor HCHO into CO2, relative to the binary 2%Au/LDH sample without Co-doping and other control samples. Based on the systematic characterizations, it was suggested that the synergetic contributions from the Co-doping, decorated Au NPs, and abundant hydroxyl groups accounted for the effective oxidative HCHO removal over 2%Au/Co-LDH at ambient temperature. In particular, it was proposed that Co-doping favored the Au deposition on Co-LDHs with strong electronic interaction, which would be beneficial for oxygen adsorption and activation at room temperature. This study will not only be contributive for further development of novel catalysts towards effective catalytic HCHO oxidation at room temperature, but also provide new insights into the oxidative HCHO removal mechanisms.