Adsorption of Pb(II) onto xanthated and hydrogen peroxide modified rubber (Hevea brasiliensis) leaf powder / Wan Khaima Azira Wan Mat Khalir

Two types of chemical modifications on rubber leaf powder were performed in order to evaluate the Pb(II) adsorption capacity by xanthation and oxidation processes. Pb(II) adsorption study was investigated under batch and fixed bed column modes. The amount of Pb(II) adsorbed increased with increasing...

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Main Author:	Wan Mat Khalir, Wan Khaima Azira
Format:	Thesis
Language:	English
Published:	2013
Subjects:	TD Environmental technology Sanitary engineering
Online Access:	https://ir.uitm.edu.my/id/eprint/15563/1/TM_WAN%20KHAIMA%20AZIRA%20WAN%20MAT%20KHALIR%20AS%2013_5.PDF
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spelling	my-uitm-ir.155632022-04-12T06:38:12Z Adsorption of Pb(II) onto xanthated and hydrogen peroxide modified rubber (Hevea brasiliensis) leaf powder / Wan Khaima Azira Wan Mat Khalir 2013-06 Wan Mat Khalir, Wan Khaima Azira TD Environmental technology. Sanitary engineering Two types of chemical modifications on rubber leaf powder were performed in order to evaluate the Pb(II) adsorption capacity by xanthation and oxidation processes. Pb(II) adsorption study was investigated under batch and fixed bed column modes. The amount of Pb(II) adsorbed increased with increasing pH, contact time and initial Pb(II) concentration but decreased with increasing adsorbent dosage, ionic strength and temperature for xanthated rubber leaf powder (XRL) and hydrogen peroxide rubber leaf powder (HPRL). The adsorption kinetics of Pb(II) by XRL and HPRL were fitted well with pseudo second order model suggesting that chemisorption could be the rate determining step in Pb(II) adsorption. The equilibrium time was achieved within 60 min for XRL and 90 min for HPRL. Adsorption of Pb(II) followed Langmuir isotherm model with the monolayer adsorption capacities of 166.7 mg/g by XRL and 52.6 mg/g by HPRL, respectively. The optimum adsorption process occurred at pH 4, shaking rate of 120 stroke/min and temperature of 303 K. The adsorption process was found to be exothermic for both adsorbents. The amount of Pb(II) adsorbed decreased in the presence o f Cu(II) ions. Pb(II) ions showed higher selectivity compared to Cu(II) ions in the binary systems. EDTA was more effective in releasing Pb(II) from XRL surface than HC1 but HPRL desorbed well in HC1. Possible mechanisms involved in the Pb(II) adsorption by XRL and HPRL were ion exchange, complexation and physical adsorption as supported by FTIR spectra, thermodynamic, ion exchange and desorption studies. Fixed bed column data was fitted well with the Thomas and Yoon-Nelson models with correlation coefficients of (R ) > 0.96 for both adsorbents. 2013-06 Thesis https://ir.uitm.edu.my/id/eprint/15563/ https://ir.uitm.edu.my/id/eprint/15563/1/TM_WAN%20KHAIMA%20AZIRA%20WAN%20MAT%20KHALIR%20AS%2013_5.PDF text en public mphil masters Universiti Teknologi MARA Faculty of Applied Science
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	TD Environmental technology Sanitary engineering
spellingShingle	TD Environmental technology Sanitary engineering Wan Mat Khalir, Wan Khaima Azira Adsorption of Pb(II) onto xanthated and hydrogen peroxide modified rubber (Hevea brasiliensis) leaf powder / Wan Khaima Azira Wan Mat Khalir
description	Two types of chemical modifications on rubber leaf powder were performed in order to evaluate the Pb(II) adsorption capacity by xanthation and oxidation processes. Pb(II) adsorption study was investigated under batch and fixed bed column modes. The amount of Pb(II) adsorbed increased with increasing pH, contact time and initial Pb(II) concentration but decreased with increasing adsorbent dosage, ionic strength and temperature for xanthated rubber leaf powder (XRL) and hydrogen peroxide rubber leaf powder (HPRL). The adsorption kinetics of Pb(II) by XRL and HPRL were fitted well with pseudo second order model suggesting that chemisorption could be the rate determining step in Pb(II) adsorption. The equilibrium time was achieved within 60 min for XRL and 90 min for HPRL. Adsorption of Pb(II) followed Langmuir isotherm model with the monolayer adsorption capacities of 166.7 mg/g by XRL and 52.6 mg/g by HPRL, respectively. The optimum adsorption process occurred at pH 4, shaking rate of 120 stroke/min and temperature of 303 K. The adsorption process was found to be exothermic for both adsorbents. The amount of Pb(II) adsorbed decreased in the presence o f Cu(II) ions. Pb(II) ions showed higher selectivity compared to Cu(II) ions in the binary systems. EDTA was more effective in releasing Pb(II) from XRL surface than HC1 but HPRL desorbed well in HC1. Possible mechanisms involved in the Pb(II) adsorption by XRL and HPRL were ion exchange, complexation and physical adsorption as supported by FTIR spectra, thermodynamic, ion exchange and desorption studies. Fixed bed column data was fitted well with the Thomas and Yoon-Nelson models with correlation coefficients of (R ) > 0.96 for both adsorbents.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Wan Mat Khalir, Wan Khaima Azira
author_facet	Wan Mat Khalir, Wan Khaima Azira
author_sort	Wan Mat Khalir, Wan Khaima Azira
title	Adsorption of Pb(II) onto xanthated and hydrogen peroxide modified rubber (Hevea brasiliensis) leaf powder / Wan Khaima Azira Wan Mat Khalir
title_short	Adsorption of Pb(II) onto xanthated and hydrogen peroxide modified rubber (Hevea brasiliensis) leaf powder / Wan Khaima Azira Wan Mat Khalir
title_full	Adsorption of Pb(II) onto xanthated and hydrogen peroxide modified rubber (Hevea brasiliensis) leaf powder / Wan Khaima Azira Wan Mat Khalir
title_fullStr	Adsorption of Pb(II) onto xanthated and hydrogen peroxide modified rubber (Hevea brasiliensis) leaf powder / Wan Khaima Azira Wan Mat Khalir
title_full_unstemmed	Adsorption of Pb(II) onto xanthated and hydrogen peroxide modified rubber (Hevea brasiliensis) leaf powder / Wan Khaima Azira Wan Mat Khalir
title_sort	adsorption of pb(ii) onto xanthated and hydrogen peroxide modified rubber (hevea brasiliensis) leaf powder / wan khaima azira wan mat khalir
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Applied Science
publishDate	2013
url	https://ir.uitm.edu.my/id/eprint/15563/1/TM_WAN%20KHAIMA%20AZIRA%20WAN%20MAT%20KHALIR%20AS%2013_5.PDF
_version_	1783733423506980864

Adsorption of Pb(II) onto xanthated and hydrogen peroxide modified rubber (Hevea brasiliensis) leaf powder / Wan Khaima Azira Wan Mat Khalir

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