Advanced Ceramics Research Center, Nagoya Institute of Technology, Nagoya, 466-8555, Japan.
Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya, 466-8555, Japan.
Sci Rep. 2021 Apr 5;11(1):7512. doi: 10.1038/s41598-021-86992-8.
Controlling of volatile organic compound (VOC) emitted from industrial processes as most abundant and harmful air pollutant, has become one of the most important global environmental issues due to the rapid urbanization and industrialization. As an alternative and new type catalyst instead of conventional noble-metal nanoparticles widely utilized in oxidative decomposition of VOC, here we report the superior catalytic performance with 100% CO/CO conversion on hydroxyapatite (HAp, Ca(PO)(OH)) with structurally well-controlled active surface tailored via facile one-step mechanochemical treatment in ambient air. With detailed characterizations of particle morphology, crystallinity and chemical structure with respects to surface defect/oxygen vacancy formation, acidity/basicity and VOC affinity on HAps activated through different mechanical stresses when altered ball size is utilized in planetary ball-milling assisted mechanochemical process, it was found that the predominant defect/oxygen vacancy generation in PO site and enhanced basic site population established by selective mechanochemical activation of c-plane, facilitates the favorable catalytic oxidation route towards highly-efficient CO/CO conversion of VOC. Regards to the cost-effectiveness and non-toxic nature of HAp, incorporated with the sustainable mechanochemical surface structure tuning process, the results presented in this work opens new strategy in development of novel noble-metal-free catalyst for VOC elimination and environmental cleaning techniques.
控制挥发性有机化合物（VOC）的排放已成为全球最重要的环境问题之一，因为城市化和工业化进程的快速发展，VOC 作为最丰富和最有害的空气污染物之一。在这里，我们报道了一种替代传统的广泛用于 VOC 氧化分解的贵金属纳米颗粒的新型催化剂，即在环境空气中通过简便的一步机械化学处理，对具有结构可控活性表面的羟基磷灰石（HAp，Ca（PO）（OH））具有优异的催化性能，可实现 100%的 CO/CO 转化率。通过详细的颗粒形貌、结晶度和化学结构的特性，以及对通过改变行星球磨机辅助机械化学过程中使用的不同球大小来改变机械应力时 HAp 表面缺陷/氧空位形成、酸碱性和 VOC 亲和力的特性研究，发现 PO 位主要的缺陷/氧空位生成和通过 c 面的选择性机械化学活化建立的增强的碱性位种群，有利于高效 CO/CO 转化 VOC 的有利催化氧化途径。鉴于 HAp 的成本效益和无毒性质，以及可持续的机械化学表面结构调谐过程，这项工作为开发用于消除 VOC 和环境清洁技术的新型无贵金属催化剂开辟了新策略。
