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High crosslinked sodium carboxyl methylstarch-g-poly (acrylic acid-co-acrylamide) resin for heavy metal adsorption: its characteristics and mechanisms

High crosslinked sodium carboxyl methylstarch-g-poly (acrylic acid-co-acrylamide) resin for heavy metal adsorption: its characteristics and mechanisms
High crosslinked sodium carboxyl methylstarch-g-poly (acrylic acid-co-acrylamide) resin for heavy metal adsorption: its characteristics and mechanisms
A lower expansive heavy metal adsorbent, high crosslinked sodium carboxyl methylstarch-g-poly (acrylic acid-co-acrylamide)resin (HCAA), has been prepared by enhancing the crosslinking degree of the traditional water-absorbing polymer under the graftcopolymerization reaction. Further heavy metal adsorption experiments, morphology analysis, and structure characteristic ob-servations indicate that HCAA resin has an excellent heavy metal adsorption properties for Cr3+, Cu2+, Ni2+, and Zn2+of 80.08,158.07, 155.71, and 137.15 mg/g, respectively. The nanoholes in network structures of HCAA resin expanding in solutionprovide an effective diffusion and exchange channels for heavy metal ions and Na+. The adsorption process of HCAA containing –COONa is attributed to ion exchange process, and its essence is to form the coordination bond with heavy metals. Theadsorption capacity differences of –COO−have been explained by using the coordination chemistry theory. In addition, theadsorption selectivity of an expansive adsorbent containing–COONa are heavy metals > H2O >> Na+. Our research puts forwardan insight that increasing the crosslinker content on the basis of the traditional super absorbent resin can obtain a lower expansiveadsorbent to heavy metal pollutants
0944-1344
Zhang, Ming
edeebb0b-cfae-4db1-a919-4c4e5fdae724
Yang, Ping
eead0b00-bbdf-42d9-a2b9-6f69632799fb
Lan, Guihong
fd98a25b-e8f1-4a24-a163-a73f2048b130
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Cai, Qin
0ccb84a1-cc9b-4d1f-a8e8-16cec26ae7ba
Xi, Junnan
4b8bdd06-4728-48e3-8026-739aca66b2c0
Zhang, Ming
edeebb0b-cfae-4db1-a919-4c4e5fdae724
Yang, Ping
eead0b00-bbdf-42d9-a2b9-6f69632799fb
Lan, Guihong
fd98a25b-e8f1-4a24-a163-a73f2048b130
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Cai, Qin
0ccb84a1-cc9b-4d1f-a8e8-16cec26ae7ba
Xi, Junnan
4b8bdd06-4728-48e3-8026-739aca66b2c0

Zhang, Ming, Yang, Ping, Lan, Guihong, Liu, Yongqiang, Cai, Qin and Xi, Junnan (2020) High crosslinked sodium carboxyl methylstarch-g-poly (acrylic acid-co-acrylamide) resin for heavy metal adsorption: its characteristics and mechanisms. Environmental Science and Pollution Research. (doi:10.1007/s11356-020-09945-0).

Record type: Article

Abstract

A lower expansive heavy metal adsorbent, high crosslinked sodium carboxyl methylstarch-g-poly (acrylic acid-co-acrylamide)resin (HCAA), has been prepared by enhancing the crosslinking degree of the traditional water-absorbing polymer under the graftcopolymerization reaction. Further heavy metal adsorption experiments, morphology analysis, and structure characteristic ob-servations indicate that HCAA resin has an excellent heavy metal adsorption properties for Cr3+, Cu2+, Ni2+, and Zn2+of 80.08,158.07, 155.71, and 137.15 mg/g, respectively. The nanoholes in network structures of HCAA resin expanding in solutionprovide an effective diffusion and exchange channels for heavy metal ions and Na+. The adsorption process of HCAA containing –COONa is attributed to ion exchange process, and its essence is to form the coordination bond with heavy metals. Theadsorption capacity differences of –COO−have been explained by using the coordination chemistry theory. In addition, theadsorption selectivity of an expansive adsorbent containing–COONa are heavy metals > H2O >> Na+. Our research puts forwardan insight that increasing the crosslinker content on the basis of the traditional super absorbent resin can obtain a lower expansiveadsorbent to heavy metal pollutants

Text
Zhang2020HiGhCrosslinkedSodiumCarboxylM - Accepted Manuscript
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Accepted/In Press date: 29 June 2020
e-pub ahead of print date: 5 July 2020

Identifiers

Local EPrints ID: 442844
URI: http://eprints.soton.ac.uk/id/eprint/442844
ISSN: 0944-1344
PURE UUID: cc91cebd-3fc7-4df3-85b5-60664c562bf5

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Date deposited: 29 Jul 2020 16:30
Last modified: 06 Oct 2020 17:12

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