Efficient construction of calcium fluoride nanoaggregates for enhanced water vapor adsorption  

作　　者：Dan-Lei Yang Jing Cao Rong-Kun Liu Jie-Xin Wang 

机构地区：[1]School of Life Sciences and Chemical Engineering,Jiangsu Second Normal University,Nanjing,210013,China [2]State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029,China [3]Research Center of the Ministry of Education for High Gravity Engineering and Technology,Beijing University of Chemical Technology,Beijing,100029,China [4]Petrochemical Research Institute,PetroChina,Beijing,102206,China

出　　处：《Particuology》2024年第6期191-197,共7页颗粒学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(grant No.2021YFA1201301);the National Natural Science Foundation of China(grant No.22288102).

摘　　要：Calcium fluoride(CaF_(2))is an ideal adsorbent for the dehydration of gaseous hydrogen fluoride(HF)containing water vapor.In this work,a novel CaF_(2)absorbent,spherical CaF_(2)nanoaggregates(NAs)with a closely packed structure,was proposed and efficiently fabricated by spray drying technology.As the building blocks of CaF_(2)NAs,the CaF_(2)nanoparticles(NPs)were prepared by the addition of excess calcium ions(Ca^(2+))or fluorine ions(F−)in the synthesis.The results indicated that the CaF_(2)NPs synthesized by excess Ca^(2+)and the corresponding NAs exhibited much better water vapor adsorption properties than their counterparts by excess F−,owing to higher zeta potentials.More importantly,whether excess Ca^(2+)or F^(−),CaF_(2)NAs had further enhanced water vapor adsorption capacity compared to primary CaF_(2)NPs,possibly owing to their unique nano-micro secondary structures and higher surface areas.This work has great potential in the development of high-performance absorbents for separating moisture from corrosive gas HF.

关 键 词：CaF_(2)nanoaggregates Water vapor adsorption Spray drying 

分 类 号：O64[理学—物理化学]