Development Of A Portable Membrane-Color-Sensor For Detection Of Heavy Metal

A basic requirement of colorimetric membrane-based sensors is to allow the target analyte to access to the chromophore while retaining a strong chromophore immobilization on the membrane surface. This study elucidates the fundamental perceptive of membrane morphologies and their influences on the bi...

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Main Author:	Azmi, Nur Atiah
Format:	Thesis
Language:	English
Published:	2019
Subjects:	T Technology TP155-156 Chemical engineering
Online Access:	http://eprints.usm.my/46858/1/Development%20Of%20A%20Portable%20Membrane-Color-Sensor%20For%20Detection%20Of%20Heavy%20Metal.pdf
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spelling	my-usm-ep.468582021-11-17T03:42:11Z Development Of A Portable Membrane-Color-Sensor For Detection Of Heavy Metal 2019-07-01 Azmi, Nur Atiah T Technology TP155-156 Chemical engineering A basic requirement of colorimetric membrane-based sensors is to allow the target analyte to access to the chromophore while retaining a strong chromophore immobilization on the membrane surface. This study elucidates the fundamental perceptive of membrane morphologies and their influences on the binding of chromophores to detect aqueous heavy metals ions. Flat sheet membranes consist of mixed polymer cellulose acetate (CA) and chitosan (CS) was acts as the sensing platform for chromophore binding. Membrane with 17 wt.% CA and 1 wt.% CS showed to have the high binding capacity and high binding stability up to 90 days of measurement. The addition of deionized water (DI) as the non-solvent additive has also shown to improve the membrane porousness, which improved the sensor’s sensitivity. Visible color changes of the colorimetric membrane from blue-greenish to peachy-pink was observed when it was in contact with the Pb2+ ions in 1 ppm Pb(NO3)2. Selection of sensitive chromophore (Dithizone, 1-(2-pyridylazo) 2-naphthol and 4-(2-pyridylazo)-resorcinol) and its immobilization strategy on the membrane sensor has also been carried out. Dithizone (DTz) at unadjusted pH was capable to produce an obvious color transition observed through UV-visible absorption spectrum and naked eyes recognition. The optimum immobilization of DTz required the concentration of 100 ppm and 10 minutes immobilization time. To determine the sensitivity and selectivity of the developed colorimetric sensor in the single and mixed aqueous heavy metals ions solution, the sensing conditions such as pH, type of heavy metals (Pb2+, Hg2+, Zn2+ and Cu2+), concentration and response time were evaluated. The developed DTz-membrane sensor in this work has exhibited quick (within 1 minute) color change and was able to display distinctive color changes from blue-greenish to peachy-pink, yellowish-orange, red-violet and reddish-brown in the response to the presence of Pb2+, Hg2+, Zn2+ and Cu2+ in aqueous solutions. The quantitative analysis using RGB (R:Red; G:Green; B:Blue) data showed that each tested metal ions have demonstrated their own RGB’s recognition pattern phase without significant interfering effects among the heavy metal ions. This showed the potential for practical applications of on-site quick detection on either single or mixed heavy metal ions. The DTz-CA/CS membrane showed a distinctive color changed in the detection of synthetic heavy metals ions in the water that obtain from Kerian River. The synthetic heavy metals ions was prepared the at maximum permissible limit of 0.1 ppm Pb2+, 2.0 ppm Zn2+ and 0.2 ppm Cu2+ for industrial effluent (Standard A) by Malaysian Department of Environment. This membrane sensor was successfully applied for the determination of heavy metals ions not only limited to river water quality assessment but also included the cosmetic product analysis (lipstick samples) at the low trace level of heavy metals ions. 2019-07 Thesis http://eprints.usm.my/46858/ http://eprints.usm.my/46858/1/Development%20Of%20A%20Portable%20Membrane-Color-Sensor%20For%20Detection%20Of%20Heavy%20Metal.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Kimia
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	T Technology TP155-156 Chemical engineering
spellingShingle	T Technology TP155-156 Chemical engineering Azmi, Nur Atiah Development Of A Portable Membrane-Color-Sensor For Detection Of Heavy Metal
description	A basic requirement of colorimetric membrane-based sensors is to allow the target analyte to access to the chromophore while retaining a strong chromophore immobilization on the membrane surface. This study elucidates the fundamental perceptive of membrane morphologies and their influences on the binding of chromophores to detect aqueous heavy metals ions. Flat sheet membranes consist of mixed polymer cellulose acetate (CA) and chitosan (CS) was acts as the sensing platform for chromophore binding. Membrane with 17 wt.% CA and 1 wt.% CS showed to have the high binding capacity and high binding stability up to 90 days of measurement. The addition of deionized water (DI) as the non-solvent additive has also shown to improve the membrane porousness, which improved the sensor’s sensitivity. Visible color changes of the colorimetric membrane from blue-greenish to peachy-pink was observed when it was in contact with the Pb2+ ions in 1 ppm Pb(NO3)2. Selection of sensitive chromophore (Dithizone, 1-(2-pyridylazo) 2-naphthol and 4-(2-pyridylazo)-resorcinol) and its immobilization strategy on the membrane sensor has also been carried out. Dithizone (DTz) at unadjusted pH was capable to produce an obvious color transition observed through UV-visible absorption spectrum and naked eyes recognition. The optimum immobilization of DTz required the concentration of 100 ppm and 10 minutes immobilization time. To determine the sensitivity and selectivity of the developed colorimetric sensor in the single and mixed aqueous heavy metals ions solution, the sensing conditions such as pH, type of heavy metals (Pb2+, Hg2+, Zn2+ and Cu2+), concentration and response time were evaluated. The developed DTz-membrane sensor in this work has exhibited quick (within 1 minute) color change and was able to display distinctive color changes from blue-greenish to peachy-pink, yellowish-orange, red-violet and reddish-brown in the response to the presence of Pb2+, Hg2+, Zn2+ and Cu2+ in aqueous solutions. The quantitative analysis using RGB (R:Red; G:Green; B:Blue) data showed that each tested metal ions have demonstrated their own RGB’s recognition pattern phase without significant interfering effects among the heavy metal ions. This showed the potential for practical applications of on-site quick detection on either single or mixed heavy metal ions. The DTz-CA/CS membrane showed a distinctive color changed in the detection of synthetic heavy metals ions in the water that obtain from Kerian River. The synthetic heavy metals ions was prepared the at maximum permissible limit of 0.1 ppm Pb2+, 2.0 ppm Zn2+ and 0.2 ppm Cu2+ for industrial effluent (Standard A) by Malaysian Department of Environment. This membrane sensor was successfully applied for the determination of heavy metals ions not only limited to river water quality assessment but also included the cosmetic product analysis (lipstick samples) at the low trace level of heavy metals ions.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Azmi, Nur Atiah
author_facet	Azmi, Nur Atiah
author_sort	Azmi, Nur Atiah
title	Development Of A Portable Membrane-Color-Sensor For Detection Of Heavy Metal
title_short	Development Of A Portable Membrane-Color-Sensor For Detection Of Heavy Metal
title_full	Development Of A Portable Membrane-Color-Sensor For Detection Of Heavy Metal
title_fullStr	Development Of A Portable Membrane-Color-Sensor For Detection Of Heavy Metal
title_full_unstemmed	Development Of A Portable Membrane-Color-Sensor For Detection Of Heavy Metal
title_sort	development of a portable membrane-color-sensor for detection of heavy metal
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Kimia
publishDate	2019
url	http://eprints.usm.my/46858/1/Development%20Of%20A%20Portable%20Membrane-Color-Sensor%20For%20Detection%20Of%20Heavy%20Metal.pdf
_version_	1747821737577283584

Development Of A Portable Membrane-Color-Sensor For Detection Of Heavy Metal

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