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Magnetic Hybrid TiO2/Alg/FeNPs Triads for the Efficient Removal of Pollutants in Water

Nanocomposite materials have been receiving considerable attention in wastewater treatment due to their improved photocatalytic efficiency. However, solutions are needed to cope with problem arise from the formation of titanium dioxide (TiO2) slurry in the treated water. In this context, the possibi...

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Main Author: Nurfatyha Rusydah, Mohamad Shahdad
Format: E-Thesis
Language:English
English
Published: Universiti Malaysia Sarawak(UNIMAS) 2018
Subjects:
TD Environmental technology. Sanitary engineering
Online Access:http://ir.unimas.my/id/eprint/30471/1/Magnetic%20Hybrid%20Alg%2024pgs.pdf
http://ir.unimas.my/id/eprint/30471/2/Magnetic%20Hybrid%20Alg%20ft.pdf
http://ir.unimas.my/id/eprint/30471/
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spelling my.unimas.ir.304712020-07-15T09:00:58Z http://ir.unimas.my/id/eprint/30471/ Magnetic Hybrid TiO2/Alg/FeNPs Triads for the Efficient Removal of Pollutants in Water Nurfatyha Rusydah, Mohamad Shahdad TD Environmental technology. Sanitary engineering Nanocomposite materials have been receiving considerable attention in wastewater treatment due to their improved photocatalytic efficiency. However, solutions are needed to cope with problem arise from the formation of titanium dioxide (TiO2) slurry in the treated water. In this context, the possibility to use photocatalytic magnetic nanoparticles to ease separation from the treated water offers an appealing solution. A facile non-thermal method was applied to synthesize a hybrid nanocomposite consisting of TiO2/calcium alginate (Alg) and magnetite nanoparticles (FeNPs) referred to as Alg/TiO2/FeNPs. The efficiency of Alg/TiO2/FeNPs was assessed for the removal of methylene blue (MB) and a mixture of three heavy metals (MHM) consisting of Cr(III), Cu(II) and Pb(II) ions in aqueous solutions under ultraviolet (UVC) irradiation (λ=254 nm). The potential of adsorbent Alg as a barrier to prevent direct contact between magnetic core and TiO2 was investigated by varying the concentrations of sodium hydroxide (NaOH) and Alg. The performance of four different synthesized Alg/TiO2/FeNPs samples (Alg/TiO2/Fe-1, Alg/TiO2/Fe-2, Alg/TiO2/Fe-3 and Alg/TiO2/Fe-4) was found to be fairly comparable and stable based on their efficiency in removing MB from aqueous solution due to the physico-chemical characterization (surface morphology, functional groups, and elemental analysis) which supports the performance of Alg/TiO2/FeNPs. For the optimization study using the response surface methodology (RSM) with three factorial Box-Behnken experimental designs, 0.2 g of Alg/TiO2/Fe-2 was chosen as it exhibited the highest MB removal of 97.6% for an initial concentration of 5 ppm of MB after 120 min treatment under UVC irradiation. Among the three independent variables studied (i.e., pH, contact time and initial MB concentration), the initial concentration of MB had significant effect towards the MB removal performance. A recycling study was done and confirmed the stability of Alg/TiO2/Fe-2 up to 3 cycles, with only a slight drop in the removal efficiency from 93.1% to 88.5%. For MHM removal, 0.6 g of Alg/TiO2/Fe-2 was selected as the optimized adsorbent dosage. Similar parameters as in MB removal were investigated for the removal of MHM using RSM via Box-Behnken design. Removal percentages of Pb(II), Cr(III), and Cu(II) ions in the aqueous solution mixture solution were 99.6%, 98.6%, and 98.4%, respectively under optimized conditions of pH 6.80 and 44 ppm within 72 min of irradiation. The removal of Pb(II) ions was the highest as it exhibited the smallest degree of hydration of metal ions precursor compared to Cr(III) and Cu(II) ions. Thus, this made Pb(II) ions to be easily adsorbed onto the surface of Alg/TiO2/Fe-2. The recycling experiments showed no significant changes with only slight increment of Pb(II) ions in the second cycle when the Alg/TiO2/Fe-2 beads were retrieved and reused in three consecutive cycles of the heavy metals removal. This finding again confirmed the stability of Alg/TiO2/Fe-2 when reused repeatedly in the photocatalytic treatment of multi-heavy metals solution. Hence, the fabricated Alg/TiO2/FeNPs nanocomposites could be a potential functional material for treating artificial dye and heavy metals laden wastewater. Universiti Malaysia Sarawak(UNIMAS) 2018 E-Thesis NonPeerReviewed text en http://ir.unimas.my/id/eprint/30471/1/Magnetic%20Hybrid%20Alg%2024pgs.pdf text en http://ir.unimas.my/id/eprint/30471/2/Magnetic%20Hybrid%20Alg%20ft.pdf Nurfatyha Rusydah, Mohamad Shahdad (2018) Magnetic Hybrid TiO2/Alg/FeNPs Triads for the Efficient Removal of Pollutants in Water. Masters thesis, Universiti Malaysia Sarawak(UNIMAS).
institution Universiti Malaysia Sarawak
building Centre for Academic Information Services (CAIS)
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sarawak
content_source UNIMAS Institutional Repository
url_provider http://ir.unimas.my/
language English
English
topic TD Environmental technology. Sanitary engineering
spellingShingle TD Environmental technology. Sanitary engineering
Nurfatyha Rusydah, Mohamad Shahdad
Magnetic Hybrid TiO2/Alg/FeNPs Triads for the Efficient Removal of Pollutants in Water
description Nanocomposite materials have been receiving considerable attention in wastewater treatment due to their improved photocatalytic efficiency. However, solutions are needed to cope with problem arise from the formation of titanium dioxide (TiO2) slurry in the treated water. In this context, the possibility to use photocatalytic magnetic nanoparticles to ease separation from the treated water offers an appealing solution. A facile non-thermal method was applied to synthesize a hybrid nanocomposite consisting of TiO2/calcium alginate (Alg) and magnetite nanoparticles (FeNPs) referred to as Alg/TiO2/FeNPs. The efficiency of Alg/TiO2/FeNPs was assessed for the removal of methylene blue (MB) and a mixture of three heavy metals (MHM) consisting of Cr(III), Cu(II) and Pb(II) ions in aqueous solutions under ultraviolet (UVC) irradiation (λ=254 nm). The potential of adsorbent Alg as a barrier to prevent direct contact between magnetic core and TiO2 was investigated by varying the concentrations of sodium hydroxide (NaOH) and Alg. The performance of four different synthesized Alg/TiO2/FeNPs samples (Alg/TiO2/Fe-1, Alg/TiO2/Fe-2, Alg/TiO2/Fe-3 and Alg/TiO2/Fe-4) was found to be fairly comparable and stable based on their efficiency in removing MB from aqueous solution due to the physico-chemical characterization (surface morphology, functional groups, and elemental analysis) which supports the performance of Alg/TiO2/FeNPs. For the optimization study using the response surface methodology (RSM) with three factorial Box-Behnken experimental designs, 0.2 g of Alg/TiO2/Fe-2 was chosen as it exhibited the highest MB removal of 97.6% for an initial concentration of 5 ppm of MB after 120 min treatment under UVC irradiation. Among the three independent variables studied (i.e., pH, contact time and initial MB concentration), the initial concentration of MB had significant effect towards the MB removal performance. A recycling study was done and confirmed the stability of Alg/TiO2/Fe-2 up to 3 cycles, with only a slight drop in the removal efficiency from 93.1% to 88.5%. For MHM removal, 0.6 g of Alg/TiO2/Fe-2 was selected as the optimized adsorbent dosage. Similar parameters as in MB removal were investigated for the removal of MHM using RSM via Box-Behnken design. Removal percentages of Pb(II), Cr(III), and Cu(II) ions in the aqueous solution mixture solution were 99.6%, 98.6%, and 98.4%, respectively under optimized conditions of pH 6.80 and 44 ppm within 72 min of irradiation. The removal of Pb(II) ions was the highest as it exhibited the smallest degree of hydration of metal ions precursor compared to Cr(III) and Cu(II) ions. Thus, this made Pb(II) ions to be easily adsorbed onto the surface of Alg/TiO2/Fe-2. The recycling experiments showed no significant changes with only slight increment of Pb(II) ions in the second cycle when the Alg/TiO2/Fe-2 beads were retrieved and reused in three consecutive cycles of the heavy metals removal. This finding again confirmed the stability of Alg/TiO2/Fe-2 when reused repeatedly in the photocatalytic treatment of multi-heavy metals solution. Hence, the fabricated Alg/TiO2/FeNPs nanocomposites could be a potential functional material for treating artificial dye and heavy metals laden wastewater.
format E-Thesis
author Nurfatyha Rusydah, Mohamad Shahdad
author_facet Nurfatyha Rusydah, Mohamad Shahdad
author_sort Nurfatyha Rusydah, Mohamad Shahdad
title Magnetic Hybrid TiO2/Alg/FeNPs Triads for the Efficient Removal of Pollutants in Water
title_short Magnetic Hybrid TiO2/Alg/FeNPs Triads for the Efficient Removal of Pollutants in Water
title_full Magnetic Hybrid TiO2/Alg/FeNPs Triads for the Efficient Removal of Pollutants in Water
title_fullStr Magnetic Hybrid TiO2/Alg/FeNPs Triads for the Efficient Removal of Pollutants in Water
title_full_unstemmed Magnetic Hybrid TiO2/Alg/FeNPs Triads for the Efficient Removal of Pollutants in Water
title_sort magnetic hybrid tio2/alg/fenps triads for the efficient removal of pollutants in water
publisher Universiti Malaysia Sarawak(UNIMAS)
publishDate 2018
url http://ir.unimas.my/id/eprint/30471/1/Magnetic%20Hybrid%20Alg%2024pgs.pdf
http://ir.unimas.my/id/eprint/30471/2/Magnetic%20Hybrid%20Alg%20ft.pdf
http://ir.unimas.my/id/eprint/30471/
_version_ 1672614462018813952
score 13.211869

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