Study on Flocculation Behavior of Cr(VI) Using a Novel Chitosan Functionalized with Thiol Groups
In this study, CTS-GSH was prepared by grafting thiol (–SH) groups onto chitosan (CTS), which was characterized through Fourier Transform Infrared (FT-IR) spectra, Scanning Electron Microscopy (SEM) and Differential Thermal Analysis–Thermogravimetric Analysis (DTA-TG). The performance of CTS-GSH was...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/15/5/1117 |
| _version_ | 1797614519766220800 |
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| author | Yuelong Zhao Peng Zhang Wei Zhang Yali Fan |
| author_facet | Yuelong Zhao Peng Zhang Wei Zhang Yali Fan |
| author_sort | Yuelong Zhao |
| collection | DOAJ |
| description | In this study, CTS-GSH was prepared by grafting thiol (–SH) groups onto chitosan (CTS), which was characterized through Fourier Transform Infrared (FT-IR) spectra, Scanning Electron Microscopy (SEM) and Differential Thermal Analysis–Thermogravimetric Analysis (DTA-TG). The performance of CTS-GSH was evaluated by measuring Cr(VI) removal efficiency. The –SH group was successfully grafted onto CTS, forming a chemical composite, CTS-GSH, with a rough, porous and spatial network surface. All of the molecules tested in this study were efficient at removing Cr(VI) from the solution. The more CTS-GSH added, the more Cr(VI) removed. When a suitable dosage of CTS-GSH was added, Cr(VI) was almost completely removed. The acidic environment at pH 5–6 was beneficial for the removal of Cr(VI), and at pH 6, the maximum removal efficiency was achieved. Further experimentation showed that with 100.0 mg/L CTS-GSH for the disposal of 5.0 mg/L Cr(VI) solution, the removal rate of Cr(VI) reached 99.3% with a slow stirring time of 8.0 min and sedimentation time of 3 h; the presence of four common ions, including Mg<sup>2+</sup>, Ca<sup>2+</sup>, SO<sub>4</sub><sup>2−</sup> and CO<sub>3</sub><sup>2−</sup>, had an inhibitory effect on CTS-GSH’s ability to remove Cr(VI) from the aqueous solution, and more CTS-GSH was needed to reduce this inhibiting action. Overall, CTS-GSH exhibited good results in Cr(VI) removal, and thus has good potential for the further treatment of heavy metal wastewater. |
| first_indexed | 2024-03-11T07:13:39Z |
| format | Article |
| id | doaj.art-740422e0636c4bd0ace0050aafe9e744 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-11T07:13:39Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-740422e0636c4bd0ace0050aafe9e7442023-11-17T08:26:27ZengMDPI AGPolymers2073-43602023-02-01155111710.3390/polym15051117Study on Flocculation Behavior of Cr(VI) Using a Novel Chitosan Functionalized with Thiol GroupsYuelong Zhao0Peng Zhang1Wei Zhang2Yali Fan3College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 411201, ChinaCollege of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 411201, ChinaCollege of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, ChinaCollege of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 411201, ChinaIn this study, CTS-GSH was prepared by grafting thiol (–SH) groups onto chitosan (CTS), which was characterized through Fourier Transform Infrared (FT-IR) spectra, Scanning Electron Microscopy (SEM) and Differential Thermal Analysis–Thermogravimetric Analysis (DTA-TG). The performance of CTS-GSH was evaluated by measuring Cr(VI) removal efficiency. The –SH group was successfully grafted onto CTS, forming a chemical composite, CTS-GSH, with a rough, porous and spatial network surface. All of the molecules tested in this study were efficient at removing Cr(VI) from the solution. The more CTS-GSH added, the more Cr(VI) removed. When a suitable dosage of CTS-GSH was added, Cr(VI) was almost completely removed. The acidic environment at pH 5–6 was beneficial for the removal of Cr(VI), and at pH 6, the maximum removal efficiency was achieved. Further experimentation showed that with 100.0 mg/L CTS-GSH for the disposal of 5.0 mg/L Cr(VI) solution, the removal rate of Cr(VI) reached 99.3% with a slow stirring time of 8.0 min and sedimentation time of 3 h; the presence of four common ions, including Mg<sup>2+</sup>, Ca<sup>2+</sup>, SO<sub>4</sub><sup>2−</sup> and CO<sub>3</sub><sup>2−</sup>, had an inhibitory effect on CTS-GSH’s ability to remove Cr(VI) from the aqueous solution, and more CTS-GSH was needed to reduce this inhibiting action. Overall, CTS-GSH exhibited good results in Cr(VI) removal, and thus has good potential for the further treatment of heavy metal wastewater.https://www.mdpi.com/2073-4360/15/5/1117hexavalent chromiumchitosanreduced glutathionechelating agentamidation reactionflocculation |
| spellingShingle | Yuelong Zhao Peng Zhang Wei Zhang Yali Fan Study on Flocculation Behavior of Cr(VI) Using a Novel Chitosan Functionalized with Thiol Groups Polymers hexavalent chromium chitosan reduced glutathione chelating agent amidation reaction flocculation |
| title | Study on Flocculation Behavior of Cr(VI) Using a Novel Chitosan Functionalized with Thiol Groups |
| title_full | Study on Flocculation Behavior of Cr(VI) Using a Novel Chitosan Functionalized with Thiol Groups |
| title_fullStr | Study on Flocculation Behavior of Cr(VI) Using a Novel Chitosan Functionalized with Thiol Groups |
| title_full_unstemmed | Study on Flocculation Behavior of Cr(VI) Using a Novel Chitosan Functionalized with Thiol Groups |
| title_short | Study on Flocculation Behavior of Cr(VI) Using a Novel Chitosan Functionalized with Thiol Groups |
| title_sort | study on flocculation behavior of cr vi using a novel chitosan functionalized with thiol groups |
| topic | hexavalent chromium chitosan reduced glutathione chelating agent amidation reaction flocculation |
| url | https://www.mdpi.com/2073-4360/15/5/1117 |
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