Photocatalytic Activity of Hierarchical Ti-Zr-ZSM-5 Catalysts from Attapulgite by Microwave-assisted Rapid System. Issue 2 (13th April 2019)

• Record Type: Journal Article
• Authors: Li, Hong-Ji; Zhang, Jian-Min; Yang, Jing; Song, Jing-Hua; Yu, Chen-Hui
• Is Part Of: Emerging materials research. Volume 8:Issue 2(2019)
• Page Start: 1
• Page End: 9
• Publication Date: 2019-04-13
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1680/jemmr.18.00100
• Languages: English
• ISSNs: 2046-0147

Abstract

Abstract : Hierarchical architectures of Ti-Zr-ZSM-5 nanocrystalline aggregates were synthesized in microwave-assisted rapid system. The micro-mesoporous structure and single-site photocatalytic activity of the nanocrystals were developed by using acidized attapulgite (MATP) in the precursor solution. The morphology, crystallinity, surface area and porosity of the samples were characterized by FTIR, XRD, SEM, TEM and N2 adsorption/desorption. Results demonstrate that Ti-Zr-ZSM-5 single-site heterogeneous catalysts persist on the typical framework of MFI structure, and present a new spherical aggregate morphology made up of hexagonal nanocrystals. The synthesis time required is reduced from 12 h to 180 min. The hierarchical nanocrystals have a similar Brunauer-Emmett-Teller surface area (349.51 m 2 g −1 ) and a high mesopore volume (0.23 cm 3 g −1 ) compared with commercial zeolites. The tetrahedrally coordinated metal oxide (titanium and zirconium) moieties were implanted and isolated in the silica matrices of micro-mesoporous ZSM-5 zeolite, which had a significant photocatalytic activity and reusability of degrading methylene blue dyeing wastewater. As a micro-reactor, it is worthwhile to be further investigated for potential applications of the nanocrystals, with single-site photocatalytic activity, in catalysis for dyeing and wastewater treatment.