INORGANIC MEMBRANES FOR WATER PURIFICATION APPLICATIONS

INORGANIC MEMBRANES FOR WATER PURIFICATION APPLICATIONS

Bibliographic Details
Main Author: Yang, Zi
Language:English
Published: The Ohio State University / OhioLINK 2020
Subjects:
Materials Science
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=osu1588556057684163
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-osu15885560576841632021-08-03T07:14:07Z INORGANIC MEMBRANES FOR WATER PURIFICATION APPLICATIONS Yang, Zi Materials Science Nanofiltration with thin supported mesoporous inorganic membranes offers the promise of a cost-efficient recovery of clean water from sources that contain dissolved salt, particles and mi-crobes. Inorganic membranes can have a high selectivity and permeability and remain chemi-cally stable at extreme conditions. In this work the deposition is reported of 200 to 500 nm thin membranes on porous ceramic supports with larger pores to obtain an optimum between strength and flow resistance. The deposition is done by casting stable dispersions of ceria pre-cursor nanoparticles, followed by rapid thermal processing (RTP). By using these techniques, the ceria membranes can be made with little defects, small pore sizes of around 3 nm. In addi-tion, the ceria membranes are found to have an excellent solution stability.The transport characteristics of any water treatment membrane are adversely affected by foul-ing. To side-step costly offline defouling techniques, we introduced membranes on piezoelectric supports that can generate ultrasound during operation by application of a remote alternating electric field. The ultrasound, emanating from membrane surface, hinders the formation of cake and laminar boundary layers by agitation and cavitation. The proof of principle for this method was obtained with 25 mm diameter porous PbZr0.52Ti0.48O3 (PZT) disks made through pressing of commercially available powder. PZT membrane supports with larger diameter were also made using a colloidal casting technique. The PZT disks could be poled at elevated temperature and a high electric field to obtain a permanent piezoelectric response. Their improved homoge-neity and surface quality enabled the deposition of the thin mesoporous ceria membranes and hence nanofiltration with in-situ fouling mitigation. Since membrane structures with lead-containing PZT may not be considered for practical water treatment, we started investigations into the synthesis of homogeneous porous α-SiO2 disks with high surface quality. Since α-SiO2 single crystals are intrinsically piezoelectric they cannot be poled. Hence porous α-SiO2 compacts for water filtration must be made with orientation of α-SiO2 particles during consolidation. A method that is suitable for the purpose is colloidal cast-ing. It was used to make porous α-SiO2 disks with a diameter of 42 mm and a thickness of 2 mm were synthesized successfully by vacuum filtration and showed proper acoustics.For each of the research activities covered in this work, comprehensive knowledge is obtained and principle goals are reached. We expect inorganic nanofiltration membranes as efficient and reliable choices for large-scale water purification. 2020 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1588556057684163 http://rave.ohiolink.edu/etdc/view?acc_num=osu1588556057684163 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Materials Science
spellingShingle Materials Science
Yang, Zi
INORGANIC MEMBRANES FOR WATER PURIFICATION APPLICATIONS
author Yang, Zi
author_facet Yang, Zi
author_sort Yang, Zi
title INORGANIC MEMBRANES FOR WATER PURIFICATION APPLICATIONS
title_short INORGANIC MEMBRANES FOR WATER PURIFICATION APPLICATIONS
title_full INORGANIC MEMBRANES FOR WATER PURIFICATION APPLICATIONS
title_fullStr INORGANIC MEMBRANES FOR WATER PURIFICATION APPLICATIONS
title_full_unstemmed INORGANIC MEMBRANES FOR WATER PURIFICATION APPLICATIONS
title_sort inorganic membranes for water purification applications
publisher The Ohio State University / OhioLINK
publishDate 2020
url http://rave.ohiolink.edu/etdc/view?acc_num=osu1588556057684163
work_keys_str_mv AT yangzi inorganicmembranesforwaterpurificationapplications
_version_ 1719457042848022528

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