Key Laboratory of Pulp & Paper Science and Technology (Ministry of Education) Qilu University of Technology, Jinan, Shandong 250353, China.
J Nanosci Nanotechnol. 2019 Nov 1;19(11):7169-7177. doi: 10.1166/jnn.2019.16614.
Developing full-spectrum photocatalysts that harvests solar light from ultraviolet to near-infrared light has aroused great interest in photodegradation of organic pollutants, due to the imminent energy crisis and growing pollution issues. Herein, we report an excellent full-spectrum photocatalyst derived from calcination of an Mg/Zn/Al/Er-hydrotalcite-like compound. The photocatalyst is a stable multi-phase oxide consisting of various syntrophic Er-doped metal oxides with different particle sizes and morphology. Its ultraviolet (UV) photocatalytic activity is maximized by increasing the fraction of Zn and sustaining the pure hydrotalcite-like phase with an appropriate fraction of Mg in preparing the Mg/Zn/Al/Er-hydrotalcite-like precursor. The visible and NIR photocatalytic activities are triggered by an indirect excitation involving an up-conversion process. The major active species of the photocatalyst in the photodegradation of methyl orange are superoxide anions and photogenerated holes. Nevertheless, hydroxyl radicals also play a moderate role in the photodegradation process. This work finds a new way to prepare full-spectrum photocatalysts with tunable chemical compositions via an environmentally friendly hydrotalcite-like precursor.
开发能够从紫外线到近红外光范围内吸收太阳光的全光谱光催化剂，对于光降解有机污染物引起了极大的兴趣，这主要是由于能源危机迫在眉睫和日益严重的污染问题。在此，我们报告了一种源自煅烧 Mg/Zn/Al/Er-水滑石类化合物的优异的全光谱光催化剂。该光催化剂是一种由不同粒径和形貌的多种共生 Er 掺杂金属氧化物组成的稳定多相氧化物。通过增加 Zn 的比例并在制备 Mg/Zn/Al/Er-水滑石类前体时保持纯水滑石相，其紫外（UV）光催化活性最大化。可见光和近红外光催化活性是通过涉及上转换过程的间接激发引发的。光催化剂在降解甲基橙过程中的主要活性物质是超氧阴离子和光生空穴。然而，在光降解过程中，羟基自由基也起着适度的作用。这项工作通过一种环保的水滑石类前体制备了具有可调化学成分的全光谱光催化剂，为其开辟了一条新途径。
