A novel disintegration–reassembly route is reported for the synthesis of mesoporous TiO₂ nanocrystalline hollow spheres with controlled crystallinity and enhanced photocatalytic activity. In this unique synthesis strategy, it is demonstrated that sol–gel‐derived mesoporous TiO₂ colloidal spheres can be disintegrated into discrete small nanoparticles that are uniformly embedded in the polymer (polystyrene, PS) matrix by surface‐induced photocatalytic polymerization. Subsequent reassembly of these TiO₂ nanoparticles can be induced by an annealing process after further coating of a resorcinol–formaldehyde (RF) resin, which forms self‐supported hollow spheres of TiO₂ at the PS/RF interface. The abundant phenolic groups on the RF resin serve as anchoring sites for the TiO₂ nanoparticles, thus enable the reassembly of the TiO₂ nanoparticles and prevent their sintering during the thermal crystallization process. This unique disintegration–reassembly process leads to the formation of self‐supported TiO₂ hollow spheres with relatively large surface area, high crystallinity, and superior photocatalytic activity in dye degradation under UV light irradiation.

中文翻译：

---

具有增强的光催化活性的介孔二氧化钛纳米晶空心球的独特崩解-重组途径

报道了一种新颖的崩解-重组路线，用于合成具有可控制的结晶度和增强的光催化活性的介孔TiO ₂纳米晶空心球。在这种独特的合成策略中，证明了溶胶-凝胶衍生的介孔TiO ₂胶体球可以分解成离散的小纳米粒子，这些纳米粒子通过表面诱导的光催化聚合均匀地嵌入聚合物（聚苯乙烯，PS）基质中。进一步涂覆间苯二酚-甲醛（RF）树脂后，可通过退火过程诱导这些TiO ₂纳米粒子的随后重新组装，该树脂形成了自支撑的TiO ₂中空球体。在PS / RF接口。RF树脂上的丰富酚基充当TiO ₂纳米颗粒的锚定位，因此能够重新组装TiO ₂纳米颗粒并防止其在热结晶过程中烧结。这种独特的分解-重组过程导致形成自支撑的TiO ₂中空球，该球具有较大的表面积，高结晶度，并且在紫外线照射下对染料的降解具有优异的光催化活性。