Herein,we present a simple strategy for preparing monolithic sodalite adsorbents via sequential additive manufacturing and post-treatments.In detail,the method includes(i)3D printing of cylindrical mono-liths using clay as the base material;(ii)thermal activation of the 3D-printed clay monoliths by calcina-tion(to produce reactive alumina and silica species and enable mechanical stabilization);(iii)conversion of the activated clay monoliths to hierarchical porous sodalite monoliths via hydrothermal alkaline treat-ment.Parametric studies on the effect of calcination temperature,alkaline concentration and hydrother-mal treatment time on the property of the resulting materials(such as phase composition and morphology)at different stages of preparation was conducted.Under the optimal conditions(i.e.,calci-nation temperature of 850℃,NaOH concentration of 3.3 mol·L-1,reaction temperature of 150℃,and reaction time of 6 h),a high-quality pure sodalite monolith was obtained,which possesses a relatively high BET surface area(58 m2·g-1)and hierarchically micro-meso-macroporous structure.In the proposed application of continuous removal of heavy metals(chromium ion as the model)from wastewater,the developed 3D-printed sodalite monolith showed excellent Cr3+removal performance and fast kinetics(～98％removal efficiency within 25 cycles),which outperformed the packed bed using sodalite pellets(made bv extrusion).

Hengyu Shen;Run Zou;Yangtao Zhou;Xing Guo;Yanan Guan;Duo Na;Jinsong Zhang;Xiaolei Fan;Yilai Jiao

Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;Department of Chemical Engineering,The University of Manchester,Oxford Road,Manchester M139PL,United Kingdom;Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 730010,China

中国化学工程学报（英文版）

[1]Hengyu Shen;Run Zou;Yangtao Zhou;Xing Guo;Yanan Guan;Duo Na;Jinsong Zhang;Xiaolei Fan;Yilai Jiao-.Additive manufacturing of sodalite monolith for continuous heavy metal removal from water sources)[J].中国化学工程学报（英文版）,2022(02):82-90

sodalite,liths,calcina,Cr3+removal

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