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大连理工大学教师个人主页系统 董应超

通讯作者:Dong, YC (reprint author), Dalian Univ Technol, Sch Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn, MOE,Minist Educ, Dalian 116024, Peoples R China.; Hampshire, S (reprint author), Univ Limerick, Bernal Inst, Limerick, Ireland.

合写作者:Liu, Jing,Dong, Xinfa,Zhu, Li,Dong, Yingchao,Hampshire, Stuart

发表时间:2019-12-01

发表刊物:JOURNAL OF THE EUROPEAN CERAMIC SOCIETY

收录刊物:EI、SCIE

卷号:39

期号:16

页面范围:5320-5331

ISSN号:0955-2219

关键字:Ceramic membrane; Waste recycling; Coal fly ash; Molybdenum trioxide; Mullite whisker

摘要:Coal fly ash, a solid state waste massively produced from coal combustion, is considered to be highly hazardous to the environment due to its persistently toxic trace elements. High-value added waste recycling is a promising technique to address this issue. In this work, a waste-to-resource strategy is proposed for design of highly porous whisker-structured mullite ceramic membranes derived from waste coal fly ash and Al(OH)(3) as raw materials and MoO3 as a single sintering additive. These were characterized in terms of their dynamic sintering behavior, shrinkage, bulk density, porosity, phase evolution, microstructure, pore size distribution, N-2 permeation flux, and mechanical strength. Addition of molybdenum trioxide effectively inhibited the sintering densification of membranes while at the same time forming a metastable low viscosity liquid at lower temperatures. This enables formation of a novel and more highly porous whisker-interlocked structure and accelerates the growth of mullite whiskers with controllable morphologies. Without degradation of mechanical properties, the open porosity increased significantly from 41.65 +/- 0.13% to 58.14 +/- 0.15% with increasing MoO3 content from 0 to 20 wt.% without any pore-forming agent, while shrinkage and pore size decreased. The method proposed in this study is expected not only to give a new and facile insight for high-value added recycling of waste coal fly ash but also to fabricate low-cost high performance ceramic membranes with novel structures for further environmental applications.

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