Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 39, Issue 16, Pages 5320-5331Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.08.042
Keywords
Ceramic membrane; Waste recycling; Coal fly ash; Molybdenum trioxide; Mullite whisker
Categories
Funding
- National Natural Science Foundation of China [21876020]
- Youth Top-Notch Talent Program of Talent Project of Revitalizing Liaoning [XLYC1807250]
- Key Project of Liaoning Natural Science Foundation [20180510005]
- Fundamental Research Funds for the Central Universities [DUT18LABO2, DUT16RC(3)050]
- 111 Program of Introducing Talents of Discipline to Universities [B13012]
- National Science Foundation of Guangdong Province, China [S2013010012199]
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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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