Synthesis and Characterization of Mixed Matrix Systems for the Removal and Recovery of Divalent Metals from Waste Streams

Bibliographic Details
Main Author:	Cooper, Charles Austin
Language:	English
Published:	University of Cincinnati / OhioLINK 2003
Subjects:	supported liquid membrane inorganic hybrid separation
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054146649

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-ucin10541466492021-08-03T06:09:02Z Synthesis and Characterization of Mixed Matrix Systems for the Removal and Recovery of Divalent Metals from Waste Streams Cooper, Charles Austin supported liquid membrane inorganic hybrid separation The separation properties of supported silicalite membranes, with a bimodal pore size distribution made from silicalite particles that were grown by hydrothermal synthesis for 0.5, 1, 2, and 3 days, were studied. The membranes consisted of a silicalite layer, from a 10 wt.% silicalite suspension, on an α-alumina or stainless steel support, sometimes modified with DCDMS (dichlorodimethyl silane) to add surface methyl groups to the silicalite layer. However, it was found that LIX-84 (2-hydroxy-5-nonylacetophenome oxime) was not entrapped within the pores of the silicalite due to hydrophobic interactions as hoped. None of the membranes made from silicalite using the various types of silicalite and the various modification techniques demonstrated good stability (no sign of metal selectivity). Regardless of operating conditions, of the six metals studied (Ca, Cd, Cu, Pb, Zn, & Ni) no selectivity was ever seen. Mesoporous silica particles were modified with LIX-84 (2-hydroxy-5-nonylacetophenome oxime). The LIX-84 was attached to the surface of silica via non-covalent forces. The adsorbent had a capacity of 0.6 mmol Cu++/g adsorbent at room temperature and a capacity of 1.1 mmol Cu++/g adsorbent at 60°C. Depending on solution pH the adsorbent had varying capacity for copper<sup>(2+)</sup>, nickel<sup>(2+)</sup>, and lead<sup>(2+)</sup>. The adsorbent was found to have good stability and gave high metal recovery when regenerated with 2 vol. % nitric acid. An increased ion-exchange rate was achieved and was attributed to the use of larger pore size silica. The silica was found to contain from 5-7 wt. % by weight LIX-84. Silica SLMs were synthesized and studied. The membranes consisted of a silica layer, from dip-coated colloidal silica, on an a-alumina support, modified with DCDMS (dichlorodimethyl silane) to add surface methyl groups to the silica layer. LIX-84 (2-hydroxy-5-nonylacetophenome oxime) was entrapped within the pores of the silica due to hydrophobic interactions between the surface methyl groups and the long hydrocarbon chain from the LIX-84. The membranes made after 2-time dip-coating demonstrated good stability (no sign of LIX loss after 12 days) and uphill Cu<sup>2+</sup> transport against the concentration gradient. Regardless of operating conditions, of the six metals studied (Ca, Cd, Cu, Pb, Zn, & Ni), only Cu<sup>(2+)</sup> showed any flux except for some experiments in which Ca<sup>2+</sup> flux could be attributed to imperfections in the membrane. Cu<sup>2+</sup> fluxes as high as 2.3 x10 -10 moles/cm<sup>2</sup> s (with 40 ppm Cu<sup>2+</sup> feed) and permeability coefficients as high as 8.0 x10<sup>-4</sup> cm/s were obtained for these mesoporous inorganic SLMs. 2003-07-01 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054146649 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054146649 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	supported liquid membrane inorganic hybrid separation
spellingShingle	supported liquid membrane inorganic hybrid separation Cooper, Charles Austin Synthesis and Characterization of Mixed Matrix Systems for the Removal and Recovery of Divalent Metals from Waste Streams
author	Cooper, Charles Austin
author_facet	Cooper, Charles Austin
author_sort	Cooper, Charles Austin
title	Synthesis and Characterization of Mixed Matrix Systems for the Removal and Recovery of Divalent Metals from Waste Streams
title_short	Synthesis and Characterization of Mixed Matrix Systems for the Removal and Recovery of Divalent Metals from Waste Streams
title_full	Synthesis and Characterization of Mixed Matrix Systems for the Removal and Recovery of Divalent Metals from Waste Streams
title_fullStr	Synthesis and Characterization of Mixed Matrix Systems for the Removal and Recovery of Divalent Metals from Waste Streams
title_full_unstemmed	Synthesis and Characterization of Mixed Matrix Systems for the Removal and Recovery of Divalent Metals from Waste Streams
title_sort	synthesis and characterization of mixed matrix systems for the removal and recovery of divalent metals from waste streams
publisher	University of Cincinnati / OhioLINK
publishDate	2003
url	http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054146649
work_keys_str_mv	AT coopercharlesaustin synthesisandcharacterizationofmixedmatrixsystemsfortheremovalandrecoveryofdivalentmetalsfromwastestreams
_version_	1719431761535959040

Synthesis and Characterization of Mixed Matrix Systems for the Removal and Recovery of Divalent Metals from Waste Streams

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