Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/14554
Title: Enhancing humic acid removal using surface-modified granular media
Authors: LIM AIK LENG
Keywords: Adsorption, Humic Acids, FTIR, Polyethylenimine, Surface Modification, XPS
Issue Date: 29-Apr-2005
Source: LIM AIK LENG (2005-04-29). Enhancing humic acid removal using surface-modified granular media. ScholarBank@NUS Repository.
Abstract: In this study, glass beads was modified with polyethylenimine (PEI) through cross-linking with 2,2-Bis(4-glycidyloxyphenyl)-propane (BADGE) followed by high temperature curing to enhance humic acid adsorption capability of the media. Zeta potential measurements, X-ray photoelectron spectroscopy and Fourier-Transform Infrared spectroscopy were used to determine the surface properties of the PEI-modified beads and the reaction mechanisms during surface modification. Zeta potentials of the glass beads changed from negative to positive after surface modification. XPS and FTIR analyses showed that the curing improved the bonding between PEI and BADGE through amide bond formation. Column adsorption tests were conducted at different humic acids concentrations, solution pH and ionic concentrations using both PEI-modified and uncoated beads. Results showed that PEI-modified beads were more effective in removing humic acids than uncoated beads. Humic acid removal mechanisms using the PEI-modified glass beads included adsorption and filtration of destabilized humic colloids. These results showed that surface modification of the glass beads with PEI enhanced humic acid removal efficiency of glass beads.
URI: http://scholarbank.nus.edu.sg/handle/10635/14554
Appears in Collections:Master's Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
ENHANCING HUMIC ACID REMOVAL USING SURFACE.pdf3.3 MBAdobe PDF

OPEN

NoneView/Download
Fig 4.3.1- experimental setup.pdf68.9 kBAdobe PDF

OPEN

NoneView/Download

Page view(s)

228
checked on Dec 11, 2017

Download(s)

386
checked on Dec 11, 2017

Google ScholarTM

Check


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