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Indexed by:期刊论文

Date of Publication:2017-06-01

Journal:JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION

Included Journals:SCIE、EI、Scopus

Volume:32

Issue:3

Page Number:532-537

ISSN No.:1000-2413

Key Words:pozzolana opal shale; cyclic utilization; thermal analysis; mineralog analysis; nano-pore

Abstract:Thermodynamic stability, microvoid distribution and phases transformation of natural pozzolana opal shale (POS) were studied systematically in this work. XRD analysis showed that opal-CT, including microcrystal cristobalite and tridymite, is a major component of POS. DTA and FT-IR indicated that there were many hydroxyl groups and acid sites on the surface of amorphous SiO2 materials. FE-SEM analysis exhibited amorphous SiO2 particles (opal-A) covering over stacking sequences microcrystal cristobalite and tridymite. Meanwhile, MIP analysis demonstrated that porosity and pore size distribution of POS remained uniform below 600 degrees C. Because stable porous microstructure is a key factor in improving photocatalyst activity, POS is suited to preparing highly active supported.