Adsorption of Cu on Epichlorohydrin-Modified Magnetic FeO Microspheres Prepared by One-Step Solvothermal Synthesis
Monodisperse epichlorohydrin (ECH)-modified magnetic Fe 3 O 4 microspheres (Fe 3 O 4 –ECH-n, where n indicates the initial ECH-to-Fe molar ratio) were prepared by a one-step solvothermal method using mono-ethylene glycol. ECH was grafted onto the surface of Fe 3 O 4 microspheres by in situ dehydroch...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2015-01-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.33.1.25 |
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| author | Shiwei Xiao Rong Liu Jiping Ma Fengxi Chen |
| author_facet | Shiwei Xiao Rong Liu Jiping Ma Fengxi Chen |
| author_sort | Shiwei Xiao |
| collection | DOAJ |
| description | Monodisperse epichlorohydrin (ECH)-modified magnetic Fe 3 O 4 microspheres (Fe 3 O 4 –ECH-n, where n indicates the initial ECH-to-Fe molar ratio) were prepared by a one-step solvothermal method using mono-ethylene glycol. ECH was grafted onto the surface of Fe 3 O 4 microspheres by in situ dehydrochlorination and hydrolysis. The ECH-derived organic groups (e.g. 1, 2-dihydroxypropyl) provide surface functional sites for the adsorption of Cu 2+ on Fe 3 O 4 –ECH-n. The Fe 3 O 4 –ECH-0.8 microspheres were found to have the highest Cu 2+ adsorption capacity (17.5 mg/g), and were magnetically recoverable and reusable for Cu 2+ adsorption for at least seven times without significant loss in their adsorption capacity. The addition of 2.5 wt% of NaCl significantly enhanced its Cu 2+ adsorption (from 17.5 to 28.5 mg/g). The apparent activation energy of the adsorption process was 14.7 kJ mol −1 . The adsorption process was endothermic (ΔH° = 11.8 kJ mol −1 ) and resulted in an increase in the entropy (ΔS° = 56.7 J mol −1 K −1 ). The negative value of ΔG° ensures that the adsorption occurs spontaneously. |
| format | Article |
| id | doaj-art-fb55146d632f43d290884ada5c76983a |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-fb55146d632f43d290884ada5c76983a2025-01-02T22:37:24ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382015-01-013310.1260/0263-6174.33.1.25Adsorption of Cu on Epichlorohydrin-Modified Magnetic FeO Microspheres Prepared by One-Step Solvothermal SynthesisShiwei Xiao0Rong Liu1Jiping Ma2Fengxi Chen3 School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430074, P.R. China School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430074, P.R. China School of Environment and Municipal Engineering, Qingdao Technological University, Qingdao 266033, P.R. China School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430074, P.R. ChinaMonodisperse epichlorohydrin (ECH)-modified magnetic Fe 3 O 4 microspheres (Fe 3 O 4 –ECH-n, where n indicates the initial ECH-to-Fe molar ratio) were prepared by a one-step solvothermal method using mono-ethylene glycol. ECH was grafted onto the surface of Fe 3 O 4 microspheres by in situ dehydrochlorination and hydrolysis. The ECH-derived organic groups (e.g. 1, 2-dihydroxypropyl) provide surface functional sites for the adsorption of Cu 2+ on Fe 3 O 4 –ECH-n. The Fe 3 O 4 –ECH-0.8 microspheres were found to have the highest Cu 2+ adsorption capacity (17.5 mg/g), and were magnetically recoverable and reusable for Cu 2+ adsorption for at least seven times without significant loss in their adsorption capacity. The addition of 2.5 wt% of NaCl significantly enhanced its Cu 2+ adsorption (from 17.5 to 28.5 mg/g). The apparent activation energy of the adsorption process was 14.7 kJ mol −1 . The adsorption process was endothermic (ΔH° = 11.8 kJ mol −1 ) and resulted in an increase in the entropy (ΔS° = 56.7 J mol −1 K −1 ). The negative value of ΔG° ensures that the adsorption occurs spontaneously.https://doi.org/10.1260/0263-6174.33.1.25 |
| spellingShingle | Shiwei Xiao Rong Liu Jiping Ma Fengxi Chen Adsorption of Cu on Epichlorohydrin-Modified Magnetic FeO Microspheres Prepared by One-Step Solvothermal Synthesis Adsorption Science & Technology |
| title | Adsorption of Cu on Epichlorohydrin-Modified Magnetic FeO Microspheres Prepared by One-Step Solvothermal Synthesis |
| title_full | Adsorption of Cu on Epichlorohydrin-Modified Magnetic FeO Microspheres Prepared by One-Step Solvothermal Synthesis |
| title_fullStr | Adsorption of Cu on Epichlorohydrin-Modified Magnetic FeO Microspheres Prepared by One-Step Solvothermal Synthesis |
| title_full_unstemmed | Adsorption of Cu on Epichlorohydrin-Modified Magnetic FeO Microspheres Prepared by One-Step Solvothermal Synthesis |
| title_short | Adsorption of Cu on Epichlorohydrin-Modified Magnetic FeO Microspheres Prepared by One-Step Solvothermal Synthesis |
| title_sort | adsorption of cu on epichlorohydrin modified magnetic feo microspheres prepared by one step solvothermal synthesis |
| url | https://doi.org/10.1260/0263-6174.33.1.25 |
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