Novel self-supporting zeolitic block with tunable porosity and crystallinity for water treatment

Zhang, Zuhua and Li, Liangfeng and He, Dongning and Ma, Xue and Yan, Chunjie and Wang, Hao (2016) Novel self-supporting zeolitic block with tunable porosity and crystallinity for water treatment. Materials Letters, 178. pp. 151-154. ISSN 0167-577X


A novel self-supporting zeolitic block with controllable porosity and mechanical properties was synthesized using coal fly ash via a two-step phase-conversion technique comprised of geopolymer foaming and hydrothermal crystallization. The mechanical properties of the block and the crystallinity of zeolite phase were controlled through tailoring the geopolymer formulation and the post-hydrothermal treatment. The zeolitic block possessed porosities of 45–55% and compressive strengths of 4.5–12 MPa, with a variation due to the geopolymer formulation (with or without slag addition). It has macro-pores, from several micrometers to hundreds micrometers, with semi-crystalline walls encrusted with well-crystalline zeolite P particles. This unique structure showed a cation exchange capacity of 24.2–54.2 meq/100 g, offering a high potential for wastewater treatment at high mass transport rate.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version due to publisher copyright policy.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 14 Mar 2017 23:24
Last Modified: 05 Feb 2018 02:54
Uncontrolled Keywords: porous materials; self-supporting; zeolite; membrane; geopolymer; porosity; CEC
Fields of Research : 03 Chemical Sciences > 0302 Inorganic Chemistry > 030299 Inorganic Chemistry not elsewhere classified
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: 10.1016/j.matlet.2016.04.214

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