Ion-selective Composite Membrane Based On Imprinting Technology |
| Posted on:2015-10-25 | Degree:Master | Type:Thesis |
| Country:China | Candidate:J Y Chen | Full Text:PDF |
| GTID:2181330452465798 | Subject:Chemical Engineering |
| Abstract/Summary: |  PDF Full Text Request |
| The discharge of heavy metal wastewater not only posed a threat to environment andhuman health， but also caused the waste of resources．People paid more and moreattentions to the recycling of heavy metal ions，especially for a single metal ions fromwastewater．In this paper，a ion imprinting composite membrane was prepared for specificsingle ion selective separation． Combining technologies of membrane separation andion-imprinting technology，the prepared membrane could separate metal ions continuouslyand efficiently．A novel ion-selective composite membrane was fabricated by electro-depositingcompound Polyethyleneimine chelated copper (Cu(â…¡)-PEI) on a commercializedcation-exchange membrane and subsequently modified with ion imprinting procedure．TheCu(â…¡)-PEI modified membrane was then crosslinked with epichlorohydrin and thetemplate Cu2+was leached with hydrochloric acid．Examination by infrared spectroscopyand scanning electron microscopy (SEM) confirmed PEI was successfully deposited ontothe surface of cation-exchange membrane．Zn2+was selected as competitive ion due tosimilar charge and ionic radius．The result of permselective experiments showed that theprepared Cu2+imprinted membrane has the ability of specificity and recognition towardsthe imprinted ion．Inspected the influence of PEI concentrationã€electric currentã€depositiontimeã€Cu:N molar ratio and support solution concentration in the membrane preparationprocess．Discussed the factors of composite membrane performance，the result shown thatwith the increase of Cu:N in the depositing solution， the selectivity of the preparedcomposite membrane first increases and then decreases and maximum selectivitycoefficient was achieved when the value of Cu:N was1:8．The electric resistance of the ionimprinted membrane increased gradually with the increase of Cu:N value． multilayerion-imprinted composite membrane has been preliminary studied．It has been analyzedfrom the deposition methodã€imprinting method and crosslinking method．... |
| Keywords/Search Tags: | ion imprinting, copper ion, electro-deposition, ion selectivity, composite membrane |
| PDF Full Text Request |
Related items |
