Synthesis of Imprinted Polysiloxanes for Immobilization of Metal ions
- PDF / 249,122 Bytes
- 6 Pages / 432 x 648 pts Page_size
- 71 Downloads / 189 Views
Synthesis of Imprinted Polysiloxanes for Immobilization of Metal ions Adnan Mujahid1∗, Faisal Amin1, Tajamal Hussain1, Naseer Iqbal2,3, Asma Tufail Shah2, Adeel Afzal2,4 1
Institute of Chemistry, University of the Punjab, Quaid-i-Azam Campus Lahore-54590,
Pakistan 2
Interdisciplinary Research Centre in Biomedical Materials, COMSATS Institute of Information
Technology, Defence Road, Off. Raiwind Road, Lahore 54000, Pakistan 3
Department of Biosciences, COMSATS Institute of Information Technology, Park Road ,Chak
Shahzad,Islamabad 45600, Pakistan 4
Affiliated Colleges at Hafr Al-Batin, King Fahd University of Petroleum and Minerals, P.O.
Box 1803, 31991 Hafr Al-Batin, Saudi Arabia * Email address: [email protected] Tel.: +92-42-99230463 ABSTRACT Imprinting is a well-established technique to induce recognition features in both organic and inorganic materials for a variety of target analytes. In this study, ion imprinted polysiloxanes with varying percentage of coupling agent i.e. 3-chloro propyl trimethoxy silane (CPTM) were synthesized by sol-gel method for imprinting of Cr3+. The imprinting of Cr3+ in cross-linked siloxane network was investigated by FT-IR which indicates the metal ion is coordinated with oxygen atoms of polysiloxanes. SEM images revealed that imprinted polysiloxanes possess uniform particles of submicron size. It was experienced that by increasing the concentration of CPTM up to 10% (v/v) substantially improves the binding capacity of polysiloxanes which allows us to recognized Cr3+ down to 50μg/L. Furthermore, the selectivity of Cr3+-imprinted polysiloxanes was evaluated by treating them with other competing metal ions of same concentration i.e. Cr6+, Pb2+ and Ni2+. In this regard, polysiloxanes showed much higher binding for imprint ion i.e. Cr3+ in comparison to above mentioned metal ions. Finally, the regenerated polysiloxanes were studied in order to reuse them thus, developing cost effective biomimetic sensor coatings. INTRODUCTION During the last few decades, the increasing use of different heavy metals pose serious environmental and health hazards. Metal smelting, tanning, electroplating, metallurgy for steel production and paint industries are major contributors of heavy metal ions in environment. Apart from others, chromium [1] is an important element in making of alloy steel, electroplating and many other industrial processes. The waste from these industries contains high concentration of
209
chromium and usually discharged without proper disposal. This results in contamination of surface and ground water as well as drinking water [2]. Generally, there are two main approaches for chromium removal from waste water i.e. sorption [3-5] of target metal ions onto various materials and other is separation through membrane filtration [6, 7]. Nevertheless, sorption is relatively more convenient and direct method for removing toxic materials as here the metal ions are adsorbed on the surface of solid absorbent. The amount of metal ions removed depends upon different parameters
Data Loading...
