Effect of ionic strength on the performance of polymer enhanced ultrafiltration in heavy metal removal from aqueous solutions

Download

index.pdf

Date

2006

Author

İslamoğlu, Sezin

Metadata

Show full item record

Item Usage Stats

305
views

120
downloads

Effect of ionic strength on the efficiency of heavy metal removal and recovery from aqueous solutions via continuous mode polymer enhanced ultrafiltration (PEUF) method was examined. Application of PEUF to divalent ions of cadmium, nickel and zinc after their prior linking with polyethylenimine (PEI) results in complete removal of metal ions from single component aqueous solutions at high pHs. Binding ability and hence the extent of metal retention in high ionic strength medium exhibits differences between solutions containing single and multicomponent metal mixtures. In single component metal solutions, extent of retention decreases but binding order of metals remains unaffected both in low and high ionic strength medium. But, in binary component metal mixtures, with increase in ionic strength the binding order of metals changes. Fractional separation of Cd, Ni and Zn ions from equimolar binary and ternary mixtures of these metals and effect of ionic strength on fractional separation efficiency were investigated. Depending on pH and salt concentration and metal pairs present in the solution fractional separation can be achieved.Dynamic and static light scattering experiments were performed in order to gain insight about the conformational changes in PEI structure due to the pH and ionic strength alternations in solution. It was found that, the increase in ionic strength reduces the size of the macromolecules. A chemical equilibrium model was developed in order to estimate the apparent binding constants of metal-PEI complexes. Based on the data obtained from continuous and batch mode PEUF experiments apparent binding constants were estimated and compared to reveal the performance differences between these operational modes.

Subject Keywords

Gases, Gas separation membranes., Polymers.

URI

http://etd.lib.metu.edu.tr/upload/3/12607832/index.pdf
https://hdl.handle.net/11511/16519

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Effect of operating parameters on selective separation of heavy metals from binary mixtures via polymer enhanced ultrafiltration Muslehiddinoglu, J; Uludağ, Yusuf; Ozbelge, HO; Yılmaz, Levent (Elsevier BV, 1998-03-18) Performance of continuous polymer enhanced ultrafiltration (PEUF) method was investigated for removal of mercury and cadmium from binary mixtures. This method includes the addition of polyethyleneimine (PEI) as a water soluble polymer to bind the metals, which was followed by ultrafiltration operation performed on both laboratory and pilot scale systems. The influence of various operating parameters such as temperature, metal/polymer ratio, presence of calcium ions and pH on retention of metals and permeate...
Effect of preparation parameters on the performance of conductive composite gas separation membranes Gulsen, D; Hacarloglu, P; Toppare, Levent Kamil; Yılmaz, Levent (2001-02-15) Mixed matrix composite membranes of a conducting polymer, polypyrrole (PPy), and an insulating polymer, polybisphenol-A-carbonate (PC) were prepared by a combined in-situ polymerization and solvent evaporation. Mixed matrix composite membranes were synthesized to combine the good gas transport properties of conductive polymer, PPy, with good mechanical properties of PC.
Polymer blend based mixed matrix gas separation membranes Karğılı, Melis; Yılmaz, Levent; Kalıpçılar, Halil; Department of Polymer Science and Technology (2015) Polymer blending and mixed matrix membranes are two methods suggested to improve performance of gas separation membranes. Dense and asymmetric membranes of PES/PI blends with different compositions were prepared and the effect of blend composition on gas separation performances was investigated. In addition, PES/PI/ZIF-8 blend based mixed matrix membranes were prepared in order to investigate the effect of nano-porous filler addition to polymer blends. ZIF-8 particles with size of 83 nm were synthesized. Pa...
Effect of carboxylic acid crosslinking of cellulose membranes on nanofiltration performance in ethanol and dimethylsulfoxide Konca, Kubra; Çulfaz Emecen, Pınar Zeynep (2019-10-01) Cellulose membranes were fabricated via phase inversion using 1-ethyl-3-methylimidazolium acetate as solvent and acetone as volatile cosolvent. 1,2,3,4-butanetetracarboxylic acid was used to partially crosslink the hydroxyl groups of cellulose, thereby changing mechanical properties of the membranes and the interactions with solvents, ethanol and dimethyl sulfoxide, and solutes. Rejection of dyes of similar size, Bromothymol Blue, Rose Bengal and Crystal Violet were shown to correlate inversely with sorptio...
Effect of feed gas composition on the separation of CO2/CH4 mixtures by PES-SAPO 34-HMA mixed matrix membranes Cakal, Ulgen; Yılmaz, Levent; Kalıpçılar, Halil (2012-11-01) The performance of zeolite and low molecular weight additive incorporated polyethersulfone (PES) membranes on the separation of CO2/CH4 mixtures at 35 degrees C was investigated. Four types of membranes, pure PES, PES/ 2-hydroxy 5-methyl aniline (HMA), PES/SAPO-34 and PES/SAPO-34/HMA, were prepared by solvent evaporation method. The CO2 concentration in the feed was varied between 5 and 70% by volume. PES/SAPO-34 membranes had a total permeability coefficient of 3 Barrer for an equimolar mixture, which was ...

Citation Formats

S. İslamoğlu, “Effect of ionic strength on the performance of polymer enhanced ultrafiltration in heavy metal removal from aqueous solutions,” Ph.D. - Doctoral Program, Middle East Technical University, 2006.