title: Incorporation of zinc for fabrication of low-cost spinel-based composite ceramic membrane support to achieve its stabilization.
abstract: In order to reduce environment risk of zinc, a spinel-based porous membrane support was prepared by the high-temperature reaction of zinc and bauxite mineral. The phase evolution process, shrinkage, porosity, mechanical property, pore size distribution, gas permeation flux and microstructure were systematically studied. The XRD results, based on a Zn/Al stoichiometric composition of 1/2, show a formation of ZnAl2O4 structure starting from 1000°C and then accomplished at 1300°C. For spinel-based composite membrane, shrinkage and porosity are mainly influenced by a combination of an expansion induced by ZnAl2O4 formation and a general densification due to amorphous liquid SiO2. The highest porosity, as high as 44%, is observed in ZnAl4 membrane support among all the investigated compositions. Compared with pure bauxite (Al), ZnAl4 composite membrane support is reinforced by ZnAl2O4 phase and inter-locked mullite crystals, which is proved by the empirical strength-porosity relationships. Also, an increase in average pore diameter and gas flux can be observed in ZnAl4. A prolonged leaching experiment reveals the zinc can be successfully incorporated into ceramic membrane support via formation of ZnAl2O4, which has substantially better resistance toward acidic attack.
authors: School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, PR China; CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, PR China; Ningbo Urban Environment Observation and Research Station-NUEORS, Chinese Academy of Sciences, PR China.
authors: Lingling
authors: L
authors: Li
authors: School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, PR China.
authors: Xinfa
authors: X
authors: Dong
authors: CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, PR China; Ningbo Urban Environment Observation and Research Station-NUEORS, Chinese Academy of Sciences, PR China. Electronic address: ycdong@iue.ac.cn.
authors: Yingchao
authors: Y
authors: Dong
authors: CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, PR China; Ningbo Urban Environment Observation and Research Station-NUEORS, Chinese Academy of Sciences, PR China.
authors: Li
authors: L
authors: Zhu
authors: Department of Environmental Engineering, Chung Yuan Christian University, Chung-Li, 320, Taiwan.
authors: Sheng-Jie
authors: SJ
authors: You
authors: Department of Environmental Engineering, Chung Yuan Christian University, Chung-Li, 320, Taiwan.
authors: Ya-Fen
authors: YF
authors: Wang
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry; D006358:Hot Temperature; D008277:Magnesium Oxide / Q000737:chemistry*; D016062:Porosity; D018505:Waste Management / Q000379:methods*; D015032:Zinc / Q000737:chemistry*
chemical_list: C111130:spinell; D008277:Magnesium Oxide; D015032:Zinc; D000537:Aluminum Oxide
keywords: Ceramic membrane; Reinforcement; Spinel-based membrane support; Zinc stabilization; ZnAl(2)O(4) phase