Additive manufacturing of sodalite monolith for continuous heavy metal removal from water sources

• 作者: Hengyu Shen Run Zou Yangtao Zhou Xing Guo Yanan Guan Duo Na Jinsong Zhang Xiaolei Fan Yilai Jiao
• 来源期刊: 中国化学工程学报（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: Recent Advances in Adsorptive Separation Materials and Technologies
• 页码范围: 82-90
• 页数: 9页
• 语种: 英文

摘要

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).