Ultrafast and highly efficient Cd(II) and Pb(II) removal by magnetic adsorbents derived from gypsum and corncob: Performances and mechanisms
The utilization of gypsum and biomass in environmental remediation has become a novel approach to promote waste recycling. Generally, raw waste materials exhibit limited adsorption capacity for heavy metal ions (HMIs) and often result in poor solid–liquid separation. In this study, through co-pyroly...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-04-01
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| Series: | Ecotoxicology and Environmental Safety |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651324003415 |
| _version_ | 1797217117051813888 |
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| author | Yuhong Yang Tongtong Han Jing Wang |
| author_facet | Yuhong Yang Tongtong Han Jing Wang |
| author_sort | Yuhong Yang |
| collection | DOAJ |
| description | The utilization of gypsum and biomass in environmental remediation has become a novel approach to promote waste recycling. Generally, raw waste materials exhibit limited adsorption capacity for heavy metal ions (HMIs) and often result in poor solid–liquid separation. In this study, through co-pyrolysis with corncob waste, titanium gypsum (TiG) was transformed into magnetic adsorbents (GCx, where x denotes the proportion of corncob in the gypsum–corncob mixture) for the removal of Cd(II) and Pb(II). GC10, the optimal adsorbent, which was composed primarily of anhydrite, calcium sulfide, and magnetic Fe3O4, exhibited significantly faster adsorption kinetics (rate constant k1 was 218 times and 9 times of raw TiG for Cd(II) and Pb(II)) and higher adsorption capacity (Qe exceeded 200 mg/g for Cd(II) and 400 mg/g for Pb(II)) than raw TiG and previous adsorbents. Cd(II) removal was more profoundly inhibited in a Cd(II) + Pb(II) binary system, suggesting that GC10 showed better selectivity for Pb(II). Moreover, GC10 could be easily separated from purified water for further recovery, due to its high saturation magnetization value (6.3 emu/g). The superior removal capabilities of GC10 were due to adsorption and surface precipitation of metal sulfides and metal sulfates on the adsorbent surface. Overall, these waste-derived magnetic adsorbents provide a novel and sustainable approach to waste recycling and the deep purification of multiple HMIs. |
| first_indexed | 2024-04-24T11:56:45Z |
| format | Article |
| id | doaj.art-9fea9f29e28441a5adb1f59b1f30dc08 |
| institution | Directory Open Access Journal |
| issn | 0147-6513 |
| language | English |
| last_indexed | 2024-04-24T11:56:45Z |
| publishDate | 2024-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecotoxicology and Environmental Safety |
| spelling | doaj.art-9fea9f29e28441a5adb1f59b1f30dc082024-04-09T04:12:34ZengElsevierEcotoxicology and Environmental Safety0147-65132024-04-01275116265Ultrafast and highly efficient Cd(II) and Pb(II) removal by magnetic adsorbents derived from gypsum and corncob: Performances and mechanismsYuhong Yang0Tongtong Han1Jing Wang2School of Water Conservancy, Henan Key Laboratory of Water Environment Simulation and Treatment, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, PR ChinaSchool of Water Conservancy, Henan Key Laboratory of Water Environment Simulation and Treatment, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, PR ChinaInternational Joint Laboratory of Henan Province for Environmental Functional Materials, Institute of Chemistry, Henan Academy of Sciences, Zhengzhou, Henan 450002, PR China; Correspondence to: No. 56 Hongzhuan Road, Zhengzhou 450002, PR China.The utilization of gypsum and biomass in environmental remediation has become a novel approach to promote waste recycling. Generally, raw waste materials exhibit limited adsorption capacity for heavy metal ions (HMIs) and often result in poor solid–liquid separation. In this study, through co-pyrolysis with corncob waste, titanium gypsum (TiG) was transformed into magnetic adsorbents (GCx, where x denotes the proportion of corncob in the gypsum–corncob mixture) for the removal of Cd(II) and Pb(II). GC10, the optimal adsorbent, which was composed primarily of anhydrite, calcium sulfide, and magnetic Fe3O4, exhibited significantly faster adsorption kinetics (rate constant k1 was 218 times and 9 times of raw TiG for Cd(II) and Pb(II)) and higher adsorption capacity (Qe exceeded 200 mg/g for Cd(II) and 400 mg/g for Pb(II)) than raw TiG and previous adsorbents. Cd(II) removal was more profoundly inhibited in a Cd(II) + Pb(II) binary system, suggesting that GC10 showed better selectivity for Pb(II). Moreover, GC10 could be easily separated from purified water for further recovery, due to its high saturation magnetization value (6.3 emu/g). The superior removal capabilities of GC10 were due to adsorption and surface precipitation of metal sulfides and metal sulfates on the adsorbent surface. Overall, these waste-derived magnetic adsorbents provide a novel and sustainable approach to waste recycling and the deep purification of multiple HMIs.http://www.sciencedirect.com/science/article/pii/S0147651324003415Titanium gypsum (TiG)CorncobHeavy metal ionsSurface precipitationMagnetic adsorbents |
| spellingShingle | Yuhong Yang Tongtong Han Jing Wang Ultrafast and highly efficient Cd(II) and Pb(II) removal by magnetic adsorbents derived from gypsum and corncob: Performances and mechanisms Ecotoxicology and Environmental Safety Titanium gypsum (TiG) Corncob Heavy metal ions Surface precipitation Magnetic adsorbents |
| title | Ultrafast and highly efficient Cd(II) and Pb(II) removal by magnetic adsorbents derived from gypsum and corncob: Performances and mechanisms |
| title_full | Ultrafast and highly efficient Cd(II) and Pb(II) removal by magnetic adsorbents derived from gypsum and corncob: Performances and mechanisms |
| title_fullStr | Ultrafast and highly efficient Cd(II) and Pb(II) removal by magnetic adsorbents derived from gypsum and corncob: Performances and mechanisms |
| title_full_unstemmed | Ultrafast and highly efficient Cd(II) and Pb(II) removal by magnetic adsorbents derived from gypsum and corncob: Performances and mechanisms |
| title_short | Ultrafast and highly efficient Cd(II) and Pb(II) removal by magnetic adsorbents derived from gypsum and corncob: Performances and mechanisms |
| title_sort | ultrafast and highly efficient cd ii and pb ii removal by magnetic adsorbents derived from gypsum and corncob performances and mechanisms |
| topic | Titanium gypsum (TiG) Corncob Heavy metal ions Surface precipitation Magnetic adsorbents |
| url | http://www.sciencedirect.com/science/article/pii/S0147651324003415 |
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