Novel reusable hydrogel adsorbents for precious metal recycle

Abstract A novel polyethylene glycol diacrylate-allylthiourea (ATU-PEGDA) hydrogel was simply synthesized through photo-reaction. Modified thiourea simultaneously employed chelation and electrostatic force to selectively recycle Ag(I) and Pd(II) from electrolytic wastewater. Sorption efficiency was...

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Autores principales:	Thakshila N. Dharmapriya, Ding-Yang Lee, Po-Jung Huang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/fdf7599408a3415caa42d33aca883ad3
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spelling	oai:doaj.org-article:fdf7599408a3415caa42d33aca883ad32021-12-02T17:17:40ZNovel reusable hydrogel adsorbents for precious metal recycle10.1038/s41598-021-99021-52045-2322https://doaj.org/article/fdf7599408a3415caa42d33aca883ad32021-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-99021-5https://doaj.org/toc/2045-2322Abstract A novel polyethylene glycol diacrylate-allylthiourea (ATU-PEGDA) hydrogel was simply synthesized through photo-reaction. Modified thiourea simultaneously employed chelation and electrostatic force to selectively recycle Ag(I) and Pd(II) from electrolytic wastewater. Sorption efficiency was nearly 100% for Ag(I) and Pd(II), which occurred at initial pH of 1 within 300 min. The adsorption characteristics of ATU-PEGDA followed Langmuir isotherm model and the maximum adsorption capacity of Ag(I) and Pd(II) achieved 83.33 and 152.81 mg g−1 sorbent, respectively where Pseudo-first order model demonstrate the adsorption kinetics. In the presence of other heavy metals, ATU-PEGDA performed high selectivity, 0.89 and 1.31 towards Ag(I) and Pd(II). ATU-PEGDA can be completely regenerated within 120 min using 0.5 M thiourea—0.001 M HNO3 and 1 M thiourea—4 M HCl after the adsorption of Ag(I) and Pd(II), respectively. Thiourea-branched structure was created after regeneration, improving the adsorption capacity. Compared to initial hydrogel, the adsorption capacity of Ag(I) and Pd(II) increased 31.83 ± 3.08% and 75.12 ± 11.02%, respectively. Over 10 consecutive adsorption–desorption cycles, ATU-PEGDA performed 111.34 and 263.79 mg g−1 sorbent in adsorption capacity of Ag(I) and Pd(II). Chromism of ATU-PEGDA hydrogel was a benefit to determine adsorption saturation and completely desorption of Ag(I) and Pd(II). Potentially, ATU-PEGDA can be extended to industrial applications.Thakshila N. DharmapriyaDing-Yang LeePo-Jung HuangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Thakshila N. Dharmapriya Ding-Yang Lee Po-Jung Huang Novel reusable hydrogel adsorbents for precious metal recycle
description	Abstract A novel polyethylene glycol diacrylate-allylthiourea (ATU-PEGDA) hydrogel was simply synthesized through photo-reaction. Modified thiourea simultaneously employed chelation and electrostatic force to selectively recycle Ag(I) and Pd(II) from electrolytic wastewater. Sorption efficiency was nearly 100% for Ag(I) and Pd(II), which occurred at initial pH of 1 within 300 min. The adsorption characteristics of ATU-PEGDA followed Langmuir isotherm model and the maximum adsorption capacity of Ag(I) and Pd(II) achieved 83.33 and 152.81 mg g−1 sorbent, respectively where Pseudo-first order model demonstrate the adsorption kinetics. In the presence of other heavy metals, ATU-PEGDA performed high selectivity, 0.89 and 1.31 towards Ag(I) and Pd(II). ATU-PEGDA can be completely regenerated within 120 min using 0.5 M thiourea—0.001 M HNO3 and 1 M thiourea—4 M HCl after the adsorption of Ag(I) and Pd(II), respectively. Thiourea-branched structure was created after regeneration, improving the adsorption capacity. Compared to initial hydrogel, the adsorption capacity of Ag(I) and Pd(II) increased 31.83 ± 3.08% and 75.12 ± 11.02%, respectively. Over 10 consecutive adsorption–desorption cycles, ATU-PEGDA performed 111.34 and 263.79 mg g−1 sorbent in adsorption capacity of Ag(I) and Pd(II). Chromism of ATU-PEGDA hydrogel was a benefit to determine adsorption saturation and completely desorption of Ag(I) and Pd(II). Potentially, ATU-PEGDA can be extended to industrial applications.
format	article
author	Thakshila N. Dharmapriya Ding-Yang Lee Po-Jung Huang
author_facet	Thakshila N. Dharmapriya Ding-Yang Lee Po-Jung Huang
author_sort	Thakshila N. Dharmapriya
title	Novel reusable hydrogel adsorbents for precious metal recycle
title_short	Novel reusable hydrogel adsorbents for precious metal recycle
title_full	Novel reusable hydrogel adsorbents for precious metal recycle
title_fullStr	Novel reusable hydrogel adsorbents for precious metal recycle
title_full_unstemmed	Novel reusable hydrogel adsorbents for precious metal recycle
title_sort	novel reusable hydrogel adsorbents for precious metal recycle
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/fdf7599408a3415caa42d33aca883ad3
work_keys_str_mv	AT thakshilandharmapriya novelreusablehydrogeladsorbentsforpreciousmetalrecycle AT dingyanglee novelreusablehydrogeladsorbentsforpreciousmetalrecycle AT pojunghuang novelreusablehydrogeladsorbentsforpreciousmetalrecycle
_version_	1718381179818737664

Novel reusable hydrogel adsorbents for precious metal recycle

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