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论文类型：期刊论文

发表时间：2017-06-01

发表刊物：JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION

收录刊物：SCIE、EI、Scopus

卷号：32

期号：3

页面范围：532-537

ISSN号：1000-2413

关键字：pozzolana opal shale; cyclic utilization; thermal analysis; mineralog analysis; nano-pore

摘要：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.