Optimization strategies of ultrasonic-assisted digestion of printed circuit board prior to determination of copper and lead

Over the past few decades, waste management has become a subject of global interest not only for environmental reasons but also for value-added goods that it provides. The use of hydrometallurgy in electronic waste (e-waste) treatment is effective in metal recovery while at the same time curtailing...

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Main Author: Abubakar, Kasimu
Format: Thesis
Language:English
Published: 2020
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Online Access:http://eprints.utm.my/102661/1/KasimuAbubakarMFS2020.pdf.pdf
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spelling my-utm-ep.1026612023-09-13T02:23:00Z Optimization strategies of ultrasonic-assisted digestion of printed circuit board prior to determination of copper and lead 2020 Abubakar, Kasimu Q Science (General) Over the past few decades, waste management has become a subject of global interest not only for environmental reasons but also for value-added goods that it provides. The use of hydrometallurgy in electronic waste (e-waste) treatment is effective in metal recovery while at the same time curtailing the waste disposal rate into the ecosystem to some degree. Nevertheless, there is growing concern over the use of concentrated acid due to the correlation of secondary pollution with its disposal. The purpose of the present study is to investigate a suitable method to efficiently recover copper (Cu) and lead (Pb) from waste mobile phone printed circuit boards (PCBs). A hydrometallurgy method was developed for effective metal leaching while maintaining low acid concentrations. Preliminary experiments were conducted to establish a suitable solvent with better dissolution strength for the target metals. Effect of four parameters viz. acid concentration, the molar ratio (HCl: HNO3), time (min) and temperature (°C) were studied using one-variable-at-a-time (OVAT) and multivariate response surface methodology (RSM) optimization. Results obtained showed that 95% Cu and 86% Pb yield were achieved using the RSM method and remarkably, 107% Cu was recovered and a lesser 91% Pb was recorded via the OVAT method. Atomic absorption spectrometer was used in determination of Cu and Pb, relative standard deviation (RSD) for intra-day precision and inter-day were 5.3%, 5.0% and 12.7%, 6.3% respectively. Limit of detection (LOD) and limit of quantitation (LOQ) obtained were 0.082 µg/g and 0.312 µg/g (Pb) whereas 0.02 µg/g and 0.064 µg/g (Cu) were recorded. Overall, the method demonstrates a significant recovery rate, thus, it could be deployed in the dissolution of metals from e-waste. Although OVAT approach gave better recovery rates, RSM seems to be more practical due to the interaction factor. 2020 Thesis http://eprints.utm.my/102661/ http://eprints.utm.my/102661/1/KasimuAbubakarMFS2020.pdf.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:146267 masters Universiti Teknologi Malaysia Faculty of Science
institution Universiti Teknologi Malaysia
collection UTM Institutional Repository
language English
topic Q Science (General)
spellingShingle Q Science (General)
Abubakar, Kasimu
Optimization strategies of ultrasonic-assisted digestion of printed circuit board prior to determination of copper and lead
description Over the past few decades, waste management has become a subject of global interest not only for environmental reasons but also for value-added goods that it provides. The use of hydrometallurgy in electronic waste (e-waste) treatment is effective in metal recovery while at the same time curtailing the waste disposal rate into the ecosystem to some degree. Nevertheless, there is growing concern over the use of concentrated acid due to the correlation of secondary pollution with its disposal. The purpose of the present study is to investigate a suitable method to efficiently recover copper (Cu) and lead (Pb) from waste mobile phone printed circuit boards (PCBs). A hydrometallurgy method was developed for effective metal leaching while maintaining low acid concentrations. Preliminary experiments were conducted to establish a suitable solvent with better dissolution strength for the target metals. Effect of four parameters viz. acid concentration, the molar ratio (HCl: HNO3), time (min) and temperature (°C) were studied using one-variable-at-a-time (OVAT) and multivariate response surface methodology (RSM) optimization. Results obtained showed that 95% Cu and 86% Pb yield were achieved using the RSM method and remarkably, 107% Cu was recovered and a lesser 91% Pb was recorded via the OVAT method. Atomic absorption spectrometer was used in determination of Cu and Pb, relative standard deviation (RSD) for intra-day precision and inter-day were 5.3%, 5.0% and 12.7%, 6.3% respectively. Limit of detection (LOD) and limit of quantitation (LOQ) obtained were 0.082 µg/g and 0.312 µg/g (Pb) whereas 0.02 µg/g and 0.064 µg/g (Cu) were recorded. Overall, the method demonstrates a significant recovery rate, thus, it could be deployed in the dissolution of metals from e-waste. Although OVAT approach gave better recovery rates, RSM seems to be more practical due to the interaction factor.
format Thesis
qualification_level Master's degree
author Abubakar, Kasimu
author_facet Abubakar, Kasimu
author_sort Abubakar, Kasimu
title Optimization strategies of ultrasonic-assisted digestion of printed circuit board prior to determination of copper and lead
title_short Optimization strategies of ultrasonic-assisted digestion of printed circuit board prior to determination of copper and lead
title_full Optimization strategies of ultrasonic-assisted digestion of printed circuit board prior to determination of copper and lead
title_fullStr Optimization strategies of ultrasonic-assisted digestion of printed circuit board prior to determination of copper and lead
title_full_unstemmed Optimization strategies of ultrasonic-assisted digestion of printed circuit board prior to determination of copper and lead
title_sort optimization strategies of ultrasonic-assisted digestion of printed circuit board prior to determination of copper and lead
granting_institution Universiti Teknologi Malaysia
granting_department Faculty of Science
publishDate 2020
url http://eprints.utm.my/102661/1/KasimuAbubakarMFS2020.pdf.pdf
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