Adsorption/desorption performance of Pb2+ and Cd2+ with super adsorption capacity of PASP/CMS hydrogel

Super-absorbent polyaspartic acid/carboxymethyl Salix psammophila powder (PASP/CMS) hydrogel was prepared by aqueous solution polymerization. PASP/CMS hydrogel was characterized by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray p...

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Autores principales:	Hao Wang, Baiyun Zhao, Li Wang
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	adsorption cadmium ion (ii) carboxymethyl salix (cms) desorption hydrogel lead ion(ii) Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/a111169d00ec4e73b6add4849456eb30
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spelling	oai:doaj.org-article:a111169d00ec4e73b6add4849456eb302021-11-06T11:11:35ZAdsorption/desorption performance of Pb2+ and Cd2+ with super adsorption capacity of PASP/CMS hydrogel0273-12231996-973210.2166/wst.2021.205https://doaj.org/article/a111169d00ec4e73b6add4849456eb302021-07-01T00:00:00Zhttp://wst.iwaponline.com/content/84/1/43https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Super-absorbent polyaspartic acid/carboxymethyl Salix psammophila powder (PASP/CMS) hydrogel was prepared by aqueous solution polymerization. PASP/CMS hydrogel was characterized by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that PASP/CMS hydrogel is prepared by graft copolymerization of the -COOH of polyaspartic acid (PASP) and the -CH2OH of CMS. The surface of the hydrogel became dense from loose porosity, and Pb2+ and Cd2+ were adsorbed onto the surface of hydrogel. The crystallinity of CMS was destroyed by the addition of PASP. The initial concentration of Pb2+ and Cd2+, pH, adsorption time and adsorption temperature on the adsorption effect were studied through experiments. Results showed that hydrogel has a good removal effect on Pb(II) and Cd(II) ions. Pseudo-second-order kinetics and Langmuir isotherm models are represented in the process, which are spontaneous, exothermic and decreased in randomness, and it is a single layer chemical adsorption. At the same time, the effect of desorption experimental parameters (HNO3 initial concentration, desorption time, and desorption temperature) on the experiment was studied and optimized. Highlights With the addition of PASP, the structure of CMC was destroyed and PASP/CMS hydrogel was formed.; The adsorption of lead and chromium ions by hydrogels accords with the Langmuir isothermal model and quasi-second-order kinetic model.; The adsorption is a monolayer chemical adsorption.; The adsorption is a spontaneous exothermic process.; The heavy metal ions were adsorbed on the surface of the hydrogel.;Hao WangBaiyun ZhaoLi WangIWA Publishingarticleadsorptioncadmium ion (ii)carboxymethyl salix (cms)desorptionhydrogellead ion(ii)Environmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 1, Pp 43-54 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	adsorption cadmium ion (ii) carboxymethyl salix (cms) desorption hydrogel lead ion(ii) Environmental technology. Sanitary engineering TD1-1066
spellingShingle	adsorption cadmium ion (ii) carboxymethyl salix (cms) desorption hydrogel lead ion(ii) Environmental technology. Sanitary engineering TD1-1066 Hao Wang Baiyun Zhao Li Wang Adsorption/desorption performance of Pb2+ and Cd2+ with super adsorption capacity of PASP/CMS hydrogel
description	Super-absorbent polyaspartic acid/carboxymethyl Salix psammophila powder (PASP/CMS) hydrogel was prepared by aqueous solution polymerization. PASP/CMS hydrogel was characterized by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that PASP/CMS hydrogel is prepared by graft copolymerization of the -COOH of polyaspartic acid (PASP) and the -CH2OH of CMS. The surface of the hydrogel became dense from loose porosity, and Pb2+ and Cd2+ were adsorbed onto the surface of hydrogel. The crystallinity of CMS was destroyed by the addition of PASP. The initial concentration of Pb2+ and Cd2+, pH, adsorption time and adsorption temperature on the adsorption effect were studied through experiments. Results showed that hydrogel has a good removal effect on Pb(II) and Cd(II) ions. Pseudo-second-order kinetics and Langmuir isotherm models are represented in the process, which are spontaneous, exothermic and decreased in randomness, and it is a single layer chemical adsorption. At the same time, the effect of desorption experimental parameters (HNO3 initial concentration, desorption time, and desorption temperature) on the experiment was studied and optimized. Highlights With the addition of PASP, the structure of CMC was destroyed and PASP/CMS hydrogel was formed.; The adsorption of lead and chromium ions by hydrogels accords with the Langmuir isothermal model and quasi-second-order kinetic model.; The adsorption is a monolayer chemical adsorption.; The adsorption is a spontaneous exothermic process.; The heavy metal ions were adsorbed on the surface of the hydrogel.;
format	article
author	Hao Wang Baiyun Zhao Li Wang
author_facet	Hao Wang Baiyun Zhao Li Wang
author_sort	Hao Wang
title	Adsorption/desorption performance of Pb2+ and Cd2+ with super adsorption capacity of PASP/CMS hydrogel
title_short	Adsorption/desorption performance of Pb2+ and Cd2+ with super adsorption capacity of PASP/CMS hydrogel
title_full	Adsorption/desorption performance of Pb2+ and Cd2+ with super adsorption capacity of PASP/CMS hydrogel
title_fullStr	Adsorption/desorption performance of Pb2+ and Cd2+ with super adsorption capacity of PASP/CMS hydrogel
title_full_unstemmed	Adsorption/desorption performance of Pb2+ and Cd2+ with super adsorption capacity of PASP/CMS hydrogel
title_sort	adsorption/desorption performance of pb2+ and cd2+ with super adsorption capacity of pasp/cms hydrogel
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/a111169d00ec4e73b6add4849456eb30
work_keys_str_mv	AT haowang adsorptiondesorptionperformanceofpb2andcd2withsuperadsorptioncapacityofpaspcmshydrogel AT baiyunzhao adsorptiondesorptionperformanceofpb2andcd2withsuperadsorptioncapacityofpaspcmshydrogel AT liwang adsorptiondesorptionperformanceofpb2andcd2withsuperadsorptioncapacityofpaspcmshydrogel
_version_	1718443751184007168

Adsorption/desorption performance of Pb2+ and Cd2+ with super adsorption capacity of PASP/CMS hydrogel

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