A large-sized (∼20 μm) pure aluminum oxynitride (AlON) powder characterized by its porous skeleton structure was synthesized by carbothermal reduction and nitridation (CRN) method using α-Al₂O₃. The photocatalytic performance of the obtained AlON powder was studied under ultraviolet-light in methylene blue (MB) solution. In 40 ml MB solution doped with 30 mg as-synthesized AlON powder, a photogradation efficiency as high as 97% was measured after irradiating 120 min, and 80% MB was mineralized by determining the total organic carbon (TOC) in the solution, i.e., mineralization is the main degradation mode of MB in the solution due to the added AlON powder. Further radical scavenger’s experiments reveal that both h⁺ and OH were the dominant reactive species in the photogradation process of MB by the AlON powder. It should be pointed out that the specific surface area of the obtained AlON powder is smaller than that of solid small-sized powder (∼800 nm) due to its porous skeleton structure. However, the measured photogradation efficiency of the obtained AlON powder is slightly higher than the reported value, which is mainly attributed to light reflection and scattering within its skeleton. The as-synthesized AlON powder has excellent dispersibility for its large particle size. Moreover, the obtained AlON powder also exhibits high reusability. Therefore, the obtained large-sized porous skeleton structure pure AlON powder is an efficient and promising photocatalyst.

大尺寸（〜20微米）纯的氧氮化铝（的AlON），其特征在于它的多孔骨架结构的粉末通过碳热还原和氮化（CRN）方法，使用的α-Al合成₂ ö ₃。在亚甲基蓝（MB）溶液中，在紫外光下研究了所得AlON粉末的光催化性能。在掺有30 mg合成AlON粉末的40 ml MB溶液中，照射120分钟后测得的光降解效率高达97％，并且通过确定溶液中的总有机碳（TOC）使80％MB矿化，即由于添加了AlON粉末，矿化是溶液中MB的主要降解方式。进一步的自由基清除剂实验表明，h ⁺和OH是AlON粉末在MB光合作用过程中的主要反应性物质。应当指出，由于其多孔的骨架结构，所获得的AlON粉末的比表面积小于固体小尺寸粉末（〜800nm）的比表面积。但是，所测得的AlON粉末的光降解效率略高于报道值，这主要归因于其骨架内部的光反射和散射。合成后的AlON粉末因其大粒径而具有出色的分散性。此外，所获得的AlON粉末还显示出高的可重复使用性。因此，所获得的大尺寸多孔骨架结构纯AlON粉末是一种有效且有前途的光催化剂。