Removal of Cd(II) and Pb(II) from aqueous solution by modified attapulgite clay
Three low-cost adsorbents (purified raw attapulgite (A-ATP), high-temperature-calcined attapulgite (T-ATP), and hydrothermal loading of MgO (MgO-ATP)) were prepared as adsorbents for the removal of Cd(II) and Pb(II). By evaluating the effect of the initial solution pH, contact time, initial solution...
Main Authors: | , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Elsevier
2020-04-01
|
Series: | Arabian Journal of Chemistry |
Online Access: | http://www.sciencedirect.com/science/article/pii/S1878535220300344 |
id |
doaj-0c20318d20564fa79a7fa5321e5a7c6e |
---|---|
record_format |
Article |
spelling |
doaj-0c20318d20564fa79a7fa5321e5a7c6e2020-11-25T02:18:20ZengElsevierArabian Journal of Chemistry1878-53522020-04-0113449945008Removal of Cd(II) and Pb(II) from aqueous solution by modified attapulgite clayRunlin Huang0Qintie Lin1Quanfa Zhong2Xiaofeng Zhang3Xiaoqing Wen4Haoyu Luo5Guangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR ChinaCorresponding author.; Guangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR ChinaGuangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR ChinaGuangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR ChinaGuangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR ChinaGuangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR ChinaThree low-cost adsorbents (purified raw attapulgite (A-ATP), high-temperature-calcined attapulgite (T-ATP), and hydrothermal loading of MgO (MgO-ATP)) were prepared as adsorbents for the removal of Cd(II) and Pb(II). By evaluating the effect of the initial solution pH, contact time, initial solution concentration, temperature and coexistence of metal ions on Cd(II) and Pb(II) adsorption, the experimental results showed that MgO-ATP was successfully prepared by hydrothermal reaction and calcination as well as appearing to be a promising excellent adsorbent. At an initial pH of 5.0, A-ATP, T-ATP and MgO-ATP reached maximum adsorption amounts of 43.5, 53.9 and 127.6 mg/g for Pb(II) and 10.9, 11.2, and 25.3 mg/g for Cd(II) at 298 K, respectively. The Cd(II) adsorption on A-ATP was fitted by the Freundlich model, while the adsorption of Pb(II) and Cd(II) on T-ATP and MgO-ATP as well as Pb(II) adsorption on A-ATP agreed with the Langmuir model. All kinetic experimental data favored pseudo second-order model. The calculated thermodynamic parameters suggested that Pb(II) adsorption onto MgO-ATP was spontaneous and exothermic. When considering foreign metal ions, the three adsorbents all presented preferential adsorption for Pb (II). Chemical adsorption had a high contribution to the removal of Cd(II) and Pb(II) by modified attapulgite. In summary, the adsorption was greatly enhanced by the hydrothermal loading of MgO. It aimed to provide insights into the MgO-ATP, which could be able to efficiently remove Cd(II) and Pb(II) and serve as an economic and promising adsorbent for heavy metal-contaminated environmental remediation. Keywords: Attapulgite clay, Cd, Pb, Adsorption, Modification, Aqueous solutionhttp://www.sciencedirect.com/science/article/pii/S1878535220300344 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Runlin Huang Qintie Lin Quanfa Zhong Xiaofeng Zhang Xiaoqing Wen Haoyu Luo |
spellingShingle |
Runlin Huang Qintie Lin Quanfa Zhong Xiaofeng Zhang Xiaoqing Wen Haoyu Luo Removal of Cd(II) and Pb(II) from aqueous solution by modified attapulgite clay Arabian Journal of Chemistry |
author_facet |
Runlin Huang Qintie Lin Quanfa Zhong Xiaofeng Zhang Xiaoqing Wen Haoyu Luo |
author_sort |
Runlin Huang |
title |
Removal of Cd(II) and Pb(II) from aqueous solution by modified attapulgite clay |
title_short |
Removal of Cd(II) and Pb(II) from aqueous solution by modified attapulgite clay |
title_full |
Removal of Cd(II) and Pb(II) from aqueous solution by modified attapulgite clay |
title_fullStr |
Removal of Cd(II) and Pb(II) from aqueous solution by modified attapulgite clay |
title_full_unstemmed |
Removal of Cd(II) and Pb(II) from aqueous solution by modified attapulgite clay |
title_sort |
removal of cd(ii) and pb(ii) from aqueous solution by modified attapulgite clay |
publisher |
Elsevier |
series |
Arabian Journal of Chemistry |
issn |
1878-5352 |
publishDate |
2020-04-01 |
description |
Three low-cost adsorbents (purified raw attapulgite (A-ATP), high-temperature-calcined attapulgite (T-ATP), and hydrothermal loading of MgO (MgO-ATP)) were prepared as adsorbents for the removal of Cd(II) and Pb(II). By evaluating the effect of the initial solution pH, contact time, initial solution concentration, temperature and coexistence of metal ions on Cd(II) and Pb(II) adsorption, the experimental results showed that MgO-ATP was successfully prepared by hydrothermal reaction and calcination as well as appearing to be a promising excellent adsorbent. At an initial pH of 5.0, A-ATP, T-ATP and MgO-ATP reached maximum adsorption amounts of 43.5, 53.9 and 127.6 mg/g for Pb(II) and 10.9, 11.2, and 25.3 mg/g for Cd(II) at 298 K, respectively. The Cd(II) adsorption on A-ATP was fitted by the Freundlich model, while the adsorption of Pb(II) and Cd(II) on T-ATP and MgO-ATP as well as Pb(II) adsorption on A-ATP agreed with the Langmuir model. All kinetic experimental data favored pseudo second-order model. The calculated thermodynamic parameters suggested that Pb(II) adsorption onto MgO-ATP was spontaneous and exothermic. When considering foreign metal ions, the three adsorbents all presented preferential adsorption for Pb (II). Chemical adsorption had a high contribution to the removal of Cd(II) and Pb(II) by modified attapulgite. In summary, the adsorption was greatly enhanced by the hydrothermal loading of MgO. It aimed to provide insights into the MgO-ATP, which could be able to efficiently remove Cd(II) and Pb(II) and serve as an economic and promising adsorbent for heavy metal-contaminated environmental remediation. Keywords: Attapulgite clay, Cd, Pb, Adsorption, Modification, Aqueous solution |
url |
http://www.sciencedirect.com/science/article/pii/S1878535220300344 |
work_keys_str_mv |
AT runlinhuang removalofcdiiandpbiifromaqueoussolutionbymodifiedattapulgiteclay AT qintielin removalofcdiiandpbiifromaqueoussolutionbymodifiedattapulgiteclay AT quanfazhong removalofcdiiandpbiifromaqueoussolutionbymodifiedattapulgiteclay AT xiaofengzhang removalofcdiiandpbiifromaqueoussolutionbymodifiedattapulgiteclay AT xiaoqingwen removalofcdiiandpbiifromaqueoussolutionbymodifiedattapulgiteclay AT haoyuluo removalofcdiiandpbiifromaqueoussolutionbymodifiedattapulgiteclay |
_version_ |
1724882856058028032 |