Core-shell-embedded Mesoporous Silica Capsules for Atmospheric Water Harvesting  

作　　者：ZHANG Shangsheng XU Shuman LEI Ruicheng PAN Yuliang MA Tao ZHANG Zheng LIU Chunsheng ZHANG Zengzhi 

机构地区：[1]China University of Mining and Technology-Beijing,School of Mechanical Electronic&Information Engineering,Beijing 10083,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2023年第5期951-959,共9页武汉理工大学学报（材料科学英文版）

基　　金：the National Natural Science Foundation of China(No.50772131);the National High-tech R&D Program of China(863 Program)(No.2011AA322100);the Key Project of Chinese Ministry of Education(No.106086);the Fundamental Research Funds for the Central Universities(No.2010YJ05)。

摘　　要：A one-step ultrasonic mechanical method was used to synthesize a kind of atmospheric water harvesting material with high water harvesting performance in a wide relative humidity(RH)range,especially at low RH(RH<40%),namely,mesoporous silica capsule(MSC)with core-shell structure.Transmission electron microscopy(TEM),nitrogen adsorption and other characterization techniques were used to study the formation process of nano-microspheres.A new mechanism of self-adaptive concentration gradient regulation of silicon migration and recombination core-shell structure was proposed to explain the formation of a cavity in the MSC system.The core-shell design can enhance the specific surface area and pore volume while maintaining the monodispersity and mesoporous size.To study the water harvesting performance of MSC,solid silica nanoparticles(SSN)and mesoporous silica nanoparticles(MSN)were prepared.In a small atmospheric water collection test(25℃,40%RH),the water vapour adsorption and desorption kinetics of MSC,SSN,MSN and a commercial silica gel(CSG)were compared and analyzed.The results show that the MSC with mesoporous channels and core-shell structure can provide about 0.324 gwater/gadsorbent,79%higher than the CSG(0.181 gwater/gadsorbent).It is 25.1%higher than that of 0.259 gwater/gadsorbentof un-hollowed MSN and 980%higher than that of0.03 gwater/gadsorbentof un-hollowed SSN.The material has a large specific surface area and pore volume,simple preparation method and low cost,which provides a feasible idea for realising atmospheric water collection in arid and semi-arid regions.

关 键 词：mesoporous silica nanocapsules core-shell structure atmospheric water harvesting adsorption performance 

分 类 号：O61[理学—无机化学]