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Preparation of calcium alginate-encapsulated sulfur particles and their application in metal nanoparticle capture: A case study of silver nanoparticles

Uniform anisotropic sulfur particles of 5.5 +/- 0.4 mu m in length, 3.9 +/- 0.4 mu m in width/thickness and an aspect ratio of 1.4 were successfully synthesized for the first time via the reaction of thiosulfate with a weak acid in the presence of sodium alginate which acted as a surfactant to impar...

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Main Authors: Lee, Koon Ming, Yoong, Wei Chuen, Loke, Chui Fung, Juan, Joon Ching, Yusoff, Khatijah, Mohtarrudin, Norhafizah, Lim, Teck Hock
Format: Article
Published: Science Society of Thailand 2021
Subjects:
Q Science (General)
T Technology (General)
Online Access:http://eprints.um.edu.my/28799/
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spelling my.um.eprints.287992022-04-21T08:06:50Z http://eprints.um.edu.my/28799/ Preparation of calcium alginate-encapsulated sulfur particles and their application in metal nanoparticle capture: A case study of silver nanoparticles Lee, Koon Ming Yoong, Wei Chuen Loke, Chui Fung Juan, Joon Ching Yusoff, Khatijah Mohtarrudin, Norhafizah Lim, Teck Hock Q Science (General) T Technology (General) Uniform anisotropic sulfur particles of 5.5 +/- 0.4 mu m in length, 3.9 +/- 0.4 mu m in width/thickness and an aspect ratio of 1.4 were successfully synthesized for the first time via the reaction of thiosulfate with a weak acid in the presence of sodium alginate which acted as a surfactant to impart water dispersibility and bestow particle size control. The sulfur particles with a zeta potential measured to be -29.5 mV were structurally characterized using PXRD and FESEM. After purification, the alginate-protected sulfur particles were discharged into a calcium chloride solution to produce fibrous calcium alginate-encapsulated sulfur composite (Ca-Alg-S) via ionotropic gelation. Ca-Alg-S was tested as absorbent of silver nanoparticles (Ag NPs) and compared to Ca-Alg gel absorbent. The Ag NPs were produced using sodium alginate as both surfactant and reducing agent under microwave-assisted heating to ensure the effect of surfactant on Ag capture was minimized. The effect of contact time on the removal efficiency of Ag NPs was established by tracking the decreasing absorbance of Ag NPs at 400 nm which was due to the surface plasmon resonance (SPR) band of Ag NPs of 10-20 nm in size. As high as 90% of Ag NP capture efficiency was achieved using Ca-Alg-S within 8 h under ambient conditions. The application of Ca-Alg-S may be extended in the future to other heavy metals including Hg, Cd, Ni and Pd which are known to react readily with sulfur, allowing effective wastewater treatment without the use of toxic sulfide or costly nanofiltration system. Science Society of Thailand 2021-07 Article PeerReviewed Lee, Koon Ming and Yoong, Wei Chuen and Loke, Chui Fung and Juan, Joon Ching and Yusoff, Khatijah and Mohtarrudin, Norhafizah and Lim, Teck Hock (2021) Preparation of calcium alginate-encapsulated sulfur particles and their application in metal nanoparticle capture: A case study of silver nanoparticles. Science Asia, 47 (1). 42+. ISSN 1513-1874, DOI https://doi.org/10.2306/scienceasia1513-1874.2021.S006 <https://doi.org/10.2306/scienceasia1513-1874.2021.S006>. 10.2306/scienceasia1513-1874.2021.S006
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic Q Science (General)
T Technology (General)
spellingShingle Q Science (General)
T Technology (General)
Lee, Koon Ming
Yoong, Wei Chuen
Loke, Chui Fung
Juan, Joon Ching
Yusoff, Khatijah
Mohtarrudin, Norhafizah
Lim, Teck Hock
Preparation of calcium alginate-encapsulated sulfur particles and their application in metal nanoparticle capture: A case study of silver nanoparticles
description Uniform anisotropic sulfur particles of 5.5 +/- 0.4 mu m in length, 3.9 +/- 0.4 mu m in width/thickness and an aspect ratio of 1.4 were successfully synthesized for the first time via the reaction of thiosulfate with a weak acid in the presence of sodium alginate which acted as a surfactant to impart water dispersibility and bestow particle size control. The sulfur particles with a zeta potential measured to be -29.5 mV were structurally characterized using PXRD and FESEM. After purification, the alginate-protected sulfur particles were discharged into a calcium chloride solution to produce fibrous calcium alginate-encapsulated sulfur composite (Ca-Alg-S) via ionotropic gelation. Ca-Alg-S was tested as absorbent of silver nanoparticles (Ag NPs) and compared to Ca-Alg gel absorbent. The Ag NPs were produced using sodium alginate as both surfactant and reducing agent under microwave-assisted heating to ensure the effect of surfactant on Ag capture was minimized. The effect of contact time on the removal efficiency of Ag NPs was established by tracking the decreasing absorbance of Ag NPs at 400 nm which was due to the surface plasmon resonance (SPR) band of Ag NPs of 10-20 nm in size. As high as 90% of Ag NP capture efficiency was achieved using Ca-Alg-S within 8 h under ambient conditions. The application of Ca-Alg-S may be extended in the future to other heavy metals including Hg, Cd, Ni and Pd which are known to react readily with sulfur, allowing effective wastewater treatment without the use of toxic sulfide or costly nanofiltration system.
format Article
author Lee, Koon Ming
Yoong, Wei Chuen
Loke, Chui Fung
Juan, Joon Ching
Yusoff, Khatijah
Mohtarrudin, Norhafizah
Lim, Teck Hock
author_facet Lee, Koon Ming
Yoong, Wei Chuen
Loke, Chui Fung
Juan, Joon Ching
Yusoff, Khatijah
Mohtarrudin, Norhafizah
Lim, Teck Hock
author_sort Lee, Koon Ming
title Preparation of calcium alginate-encapsulated sulfur particles and their application in metal nanoparticle capture: A case study of silver nanoparticles
title_short Preparation of calcium alginate-encapsulated sulfur particles and their application in metal nanoparticle capture: A case study of silver nanoparticles
title_full Preparation of calcium alginate-encapsulated sulfur particles and their application in metal nanoparticle capture: A case study of silver nanoparticles
title_fullStr Preparation of calcium alginate-encapsulated sulfur particles and their application in metal nanoparticle capture: A case study of silver nanoparticles
title_full_unstemmed Preparation of calcium alginate-encapsulated sulfur particles and their application in metal nanoparticle capture: A case study of silver nanoparticles
title_sort preparation of calcium alginate-encapsulated sulfur particles and their application in metal nanoparticle capture: a case study of silver nanoparticles
publisher Science Society of Thailand
publishDate 2021
url http://eprints.um.edu.my/28799/
_version_ 1735409576626356224
score 13.226378

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