As a promising synthesis route, indirect hydration of cyclohexene into cyclohexanol by heterogeneous catalysts shows high conversion than that in direct hydration; however, increasing the yield of cyclohexanol from cyclohexene is still a significant challenge. Notably, fabricating a high-performance catalyst is an effective method to improve the yield of the target product. Consequently, a kind of polystyrene-based hierarchically macro–mesoporous solid acid (HP CLPS-SO3H) was successfully prepared by the combination of a colloidal crystal template method with Friedel–Crafts (F–C) cross-linking. Compared with that of other catalysts (3DOM CLPS-SO3H, Amberlyst-15, and HZSM-5) with single-sized pore distributions, HP CLPS-SO3H shows remarkable catalytic performance under mild conditions, in which 90.2% cyclohexanol yield from cyclohexene was obtained. Even after 10 times reuse of the HP solid acid, 80.3% cyclohexanol yield was retained. Moreover, the original morphology was well preserved and the acid sites almost hardly reduced. The as-prepared HP CLPS-SO3H shows promising prospects in the field of cyclohexanol production.

A novel series of microcapsules with high thermal energy storage (TES) and formaldehyde photodegradation functions was successfully fabricated by eco-friendly Pickering emulsion polymerization without addition of co-emulsifiers. The microcapsules consist of paraffin as the phase-change core material and poly­(divinylbenzene) (PDVB)/titanium dioxide nanoparticles (TiO2 NPs) as the hybrid shell. The silane coupling agent KH-570 was used to adjust the hydrophobicity of TiO2 NPs for improving the stability on the oil/water surface. Meanwhile, the effects of the modification degree and addition amount of TiO2 NPs on the morphology of the microcapsules were investigated in detail, where the size of the microcapsule was adjusted from the micron to the submicron scale. The as-fabricated integrated TES system was first verified for the higher potential of formaldehyde photodegradation than that of pure TiO2 NPs under UV lamp irradiation because the microcapsule provides TiO2 NPs with heat to accelerate the catalytic process. Furthermore, the defect that TiO2 NPs are easy to fall off from the microcapsule shell was overcome by anchoring the TiO2 NPs to the PDVB shell with covalent bonds for improving the durability and reliability. The dual-functional microcapsules as the indoor green building materials have a potential application on ambient temperature regulation and indoor air purification.

A novel type of bi-functional microencapsulated phase change material (MEPCM) microcapsules with thermal energy storage (TES) and carbon dioxide (CO2) photoreduction was designed and fabricated. The polyaniline (PANI)/titanium dioxide (TiO2)/PCN-222(Fe) hybrid shell encloses phase change material (PCM) paraffin by the facile and environment-friendly Pickering emulsion polymerization, in which TiO2 and PCN-222(Fe) nanoparticles (NPs) were used as Pickering stabilizer. Furthermore, a ternary heterojunction of PANI/(TiO2)/PCN-222(Fe) was constructed due to the tight contact of the three components on the hybrid shell. The results indicate that the maximum enthalpy of MEPCMs is 174.7 J·g−1 with encapsulation efficiency of 77.2%, and the thermal properties, chemical composition, and morphological structure were well maintained after 500 high–low temperature cycles test. Besides, the MEPCM was employed to reduce CO2 into carbon monoxide (CO) and methane (CH4) under natural light irradiation. The CO evolution rate reached up to 45.16 μmol g−1 h−1 because of the suitable band gap and efficient charge migration efficiency, which is 5.4, 11, and 62 times higher than pure PCN-222(Fe), PANI, and TiO2, respectively. Moreover, the CO evolution rate decayed inapparently after five CO2 photoreduction cycles. The as-prepared bi-functional MEPCM as the temperature regulating building materials and air purification medium will stimulate a potential application.

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