Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/118247
Title: Nanofiltration Membranes for Lead Removal
Authors: GAO JIE
Keywords: Nanofiltration (NF), lead, hollow fiber membranes, hyperbranched polyethyleneimine, P84
Issue Date: 22-Aug-2014
Citation: GAO JIE (2014-08-22). Nanofiltration Membranes for Lead Removal. ScholarBank@NUS Repository.
Abstract: Heavy metals are one of the most detrimental contaminates in industrial wastewater, owing to their high toxicity. In comparison to the existing methods for heavy metal removal from wastewater, Nanofiltration (NF) is a promising technology to remove heavy metals due to its unique rejection mechanisms - steric effect and Donnan exclusion, low energy consumption, and high removal efficiency. In this study, high performance NF membranes for lead removal have been designed by chemically cross-linking the P84 porous hollow fiber substrates with hyperbranched polyethyleneimine (PEI) 60,000. To withstand high pressure operations, macrovoid-free hollow fiber substrates were firstly developed by manipulating dope formulation and spinning conditions with the addition of methanol or ethanol in spinning dopes.To design NF membranes with a narrow pore size suitable for the PEI modification, the critical mean effective pore radius (rp) for the substrates was found to be 1.5 nm. The resultant PEI cross-linked membrane removes lead effectively.
URI: http://scholarbank.nus.edu.sg/handle/10635/118247
Appears in Collections:Master's Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
GJ_master thesis_signed_20141212 (2).pdf5.05 MBAdobe PDF

OPEN

NoneView/Download

Page view(s)

154
checked on Oct 19, 2018

Download(s)

456
checked on Oct 19, 2018

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.