Aiming at promoting the photocatalytic performance of spinel oxides, an efficient method of constructing hollow porous zinc cobaltate (Zn_xCo_3−xO₄) nanocubes was established in this work. Bimetallic zeolitic imidazolate frameworks (ZIFs) were prepared through a facile self-assembly strategy, then hollow Zn_xCo_3−xO₄ nanocubes were obtained by calcining the bimetallic ZIFs precursor. The structural features and optical properties of the Zn_xCo_3−xO₄ nanocubes were comprehensively investigated by a series of characterization techniques. With higher specific surface area (about 100 m² g⁻¹), enhanced light absorbance in the whole range of 350–800 nm and lowered recombination of photogenerated electron-hole pairs, these hollow nanocubes demonstrated attractive photocatalytic activity in degrading gaseous toluene, superior to traditional stoichiometric ZnCo₂O₄ nanoparticles. The photocatalytic process and related mechanism of toluene degradation were further investigated with in situ Fourier transform infrared (FTIR) spectroscopy and electron paramagnetic resonance (EPR) techniques. Photo-induced O₂⁻ and holes were assigned as main reactive species in the photocatalytic system with hollow Zn_xCo_3−xO₄ nanocubes.

为了促进尖晶石氧化物的光催化性能，本工作建立了一种高效的中空多孔钴酸锌（Zn _x Co _{3− x} O ₄）纳米立方体的构建方法。通过简便的自组装策略制备了双金属咪唑酸盐骨架（ZIFs），然后通过煅烧双金属ZIFs前驱体获得了中空的Zn _x Co _{3- x} O ₄纳米立方体。Zn _x Co _{3− x} O ₄的结构特征和光学性质通过一系列表征技术对纳米立方体进行了全面研究。这些中空纳米立方体具有较高的比表面积（约100 m ²  g ^-1），在350-800 nm的整个范围内增强的吸光度以及降低了光生电子-空穴对的重组，因此在降解气态甲苯方面显示出诱人的光催化活性，具有优越的性能。到传统的化学计量ZnCo ₂ O ₄纳米颗粒。利用原位傅立叶变换红外光谱（FTIR）和电子顺磁共振（EPR）技术进一步研究了甲苯的光催化过程和相关的降解机理。光致Ø ₂ ^-在中空的Zn _x Co _{3− x} O ₄纳米立方体的光催化系统中，空穴被指定为主要的反应物种。