Adsorption of nitrate and phosphate in an aqueous solution on composites of PVA and chitosan prepared from a Somanniathelphusa sinensis shell

In this study, chitosan was prepared from the shell of Somanniathelphusa sinensis, which is a crab ubiquitous in Vietnam. The 3-level, 3-factor Box–Behnken design was applied to the preparation of chitosan to investigate effects of factors such as the HCl solution concentration, protein removal time...

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Autores principales:	Hieu Trung Nguyen, Ha Manh Bui
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	adsorption chitosan composite nitrate phosphate polyvinyl alcohol somanniathelphusa sinensis Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/8e062fa10369432287c331652f8c9bbb
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spelling	oai:doaj.org-article:8e062fa10369432287c331652f8c9bbb2021-11-06T07:09:37ZAdsorption of nitrate and phosphate in an aqueous solution on composites of PVA and chitosan prepared from a Somanniathelphusa sinensis shell1606-97491607-079810.2166/ws.2020.362https://doaj.org/article/8e062fa10369432287c331652f8c9bbb2021-03-01T00:00:00Zhttp://ws.iwaponline.com/content/21/2/765https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798In this study, chitosan was prepared from the shell of Somanniathelphusa sinensis, which is a crab ubiquitous in Vietnam. The 3-level, 3-factor Box–Behnken design was applied to the preparation of chitosan to investigate effects of factors such as the HCl solution concentration, protein removal time and deacetylation time on the degree of deacetylation (%DD). Scanning electron microscopy, Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy and gel permeation chromatography were employed to examine the chitosan structure, as well as pH titration and antibacterial testing of the chitosan solution. Results revealed that as-p chitosan comprises specific functional groups, with almost no impurities. Its average molecular weight was ∼225,000 g/mol, and %DD was ∼89.7%. The chitosan/PVA composite was prepared and investigated for the adsorption of nitrate and phosphate ions in water. Experimental results revealed that the adsorption capacity of a chitosan/PVA (1:2) composite is better than that of chitosan. Accordingly, the theoretical maximum adsorption capacities of nitrate and phosphate ions on chitosan were 122.0 mg/g and 344.8 mg/g, respectively. The corresponding values on the chitosan/PVA (1:2) composite were 135.1 mg/g and 384.6 mg/g. Adsorption kinetics data at 25 °C were well fitted to the pseudo-second-order model (R2 > 0.998). These results revealed that crab shell chitosan and the chitosan/PVA (1:2) composite can be used for the adsorption of nitrates and phosphates in aqueous solutions. HIGHLIGHTS The process of preparing chitosan from the shell of Somanniathelphusa Sinensis was optimized by Box-Behnken design.; The characterization of chitosan showed that it was successfully prepared with high DD value, moderate molecular weight, good antibacterial properties and no impurities.; Chitosan/PVA composites were prepared with uniform distribution, uniform particle size.; Crab shell chitosan and Chitosan/PVA (1:2) composite show good adsorption capacity of nitrate and phosphate ions in aqueous solution.;Hieu Trung NguyenHa Manh BuiIWA Publishingarticleadsorptionchitosan compositenitratephosphatepolyvinyl alcoholsomanniathelphusa sinensisWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 2, Pp 765-779 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	adsorption chitosan composite nitrate phosphate polyvinyl alcohol somanniathelphusa sinensis Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	adsorption chitosan composite nitrate phosphate polyvinyl alcohol somanniathelphusa sinensis Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Hieu Trung Nguyen Ha Manh Bui Adsorption of nitrate and phosphate in an aqueous solution on composites of PVA and chitosan prepared from a Somanniathelphusa sinensis shell
description	In this study, chitosan was prepared from the shell of Somanniathelphusa sinensis, which is a crab ubiquitous in Vietnam. The 3-level, 3-factor Box–Behnken design was applied to the preparation of chitosan to investigate effects of factors such as the HCl solution concentration, protein removal time and deacetylation time on the degree of deacetylation (%DD). Scanning electron microscopy, Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy and gel permeation chromatography were employed to examine the chitosan structure, as well as pH titration and antibacterial testing of the chitosan solution. Results revealed that as-p chitosan comprises specific functional groups, with almost no impurities. Its average molecular weight was ∼225,000 g/mol, and %DD was ∼89.7%. The chitosan/PVA composite was prepared and investigated for the adsorption of nitrate and phosphate ions in water. Experimental results revealed that the adsorption capacity of a chitosan/PVA (1:2) composite is better than that of chitosan. Accordingly, the theoretical maximum adsorption capacities of nitrate and phosphate ions on chitosan were 122.0 mg/g and 344.8 mg/g, respectively. The corresponding values on the chitosan/PVA (1:2) composite were 135.1 mg/g and 384.6 mg/g. Adsorption kinetics data at 25 °C were well fitted to the pseudo-second-order model (R2 > 0.998). These results revealed that crab shell chitosan and the chitosan/PVA (1:2) composite can be used for the adsorption of nitrates and phosphates in aqueous solutions. HIGHLIGHTS The process of preparing chitosan from the shell of Somanniathelphusa Sinensis was optimized by Box-Behnken design.; The characterization of chitosan showed that it was successfully prepared with high DD value, moderate molecular weight, good antibacterial properties and no impurities.; Chitosan/PVA composites were prepared with uniform distribution, uniform particle size.; Crab shell chitosan and Chitosan/PVA (1:2) composite show good adsorption capacity of nitrate and phosphate ions in aqueous solution.;
format	article
author	Hieu Trung Nguyen Ha Manh Bui
author_facet	Hieu Trung Nguyen Ha Manh Bui
author_sort	Hieu Trung Nguyen
title	Adsorption of nitrate and phosphate in an aqueous solution on composites of PVA and chitosan prepared from a Somanniathelphusa sinensis shell
title_short	Adsorption of nitrate and phosphate in an aqueous solution on composites of PVA and chitosan prepared from a Somanniathelphusa sinensis shell
title_full	Adsorption of nitrate and phosphate in an aqueous solution on composites of PVA and chitosan prepared from a Somanniathelphusa sinensis shell
title_fullStr	Adsorption of nitrate and phosphate in an aqueous solution on composites of PVA and chitosan prepared from a Somanniathelphusa sinensis shell
title_full_unstemmed	Adsorption of nitrate and phosphate in an aqueous solution on composites of PVA and chitosan prepared from a Somanniathelphusa sinensis shell
title_sort	adsorption of nitrate and phosphate in an aqueous solution on composites of pva and chitosan prepared from a somanniathelphusa sinensis shell
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/8e062fa10369432287c331652f8c9bbb
work_keys_str_mv	AT hieutrungnguyen adsorptionofnitrateandphosphateinanaqueoussolutiononcompositesofpvaandchitosanpreparedfromasomanniathelphusasinensisshell AT hamanhbui adsorptionofnitrateandphosphateinanaqueoussolutiononcompositesofpvaandchitosanpreparedfromasomanniathelphusasinensisshell
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Adsorption of nitrate and phosphate in an aqueous solution on composites of PVA and chitosan prepared from a Somanniathelphusa sinensis shell

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