Electrical properties of chitosan films with metal ion
Metal ion, unlike other types of pollutant, can easily enter the human body but very difficult to degrade. Metal ions in trace amount is essential nutrient, however consumption at high dose may cause disorder in plant and animals, as well as fatality due to toxicology. The purpose of this study i...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/91954/1/FS%202020%2028%20-%20ir.pdf http://psasir.upm.edu.my/id/eprint/91954/ |
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| Summary: | Metal ion, unlike other types of pollutant, can easily enter the human body but
very difficult to degrade. Metal ions in trace amount is essential nutrient,
however consumption at high dose may cause disorder in plant and animals,
as well as fatality due to toxicology. The purpose of this study is to measure
and determine the electrical properties of chitosan film with metal ion.
Intrinsically, chitosan plays important role in the adsorption process of metal
ion in the water. The experiment was conducted by soaking chitosan film with
dimension of 8 mm by 8 mm into copper, cadmium and zinc ions solutions for
20 minutes at various concentrations. The selections and concentration of
metal ion were determined according to the level of toxicity in drinking water
that allowed by EPA regulations for common contaminants. The soaked
chitosan was then attached onto the interdigitated electrode that connected to
LCR meter. The principle of chitosan film measurement is based on
determination of the impedance, capacitance, and resistance. When the
concentration metal ion was set at 50 mg/L, zinc possess the highest
resistance whilst the highest capacitance value is given by copper ions. The
standard deviation of capacitance value for chitosan film with copper,
cadmium and zinc are 7.01 nF, 74 nF and 48 nF respectively. The results were
then elaborated and analysed through Nyquist plot to identify the circuit
arrangement between chitosan film and interdigitated electrode. The dielectric
material and conductivity pattern show that polarization occur at low frequency
that lead to decrement in dielectric constant and dielectric loss. The absence
of semicircle in Nyquist graph indicates the arrangement between the chitosan
film and interdigitated electrode is in series. The finding of this study shows
the potential of chitosan as portable metal ion sensor due to its ability to
provide authentic amount of ions in the water through detection of samples’
electrical changes in real-time. |
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