Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
Li, Mengyuan1,2; Liu, Dong1,5,7 ; Wang, Shun1,3; Guo, Haozhe1; Losic, Dusan4; Deng, Liangliang1; Wu, Shijun1; Yuan, Peng1,6
| |
| Efficient removal of Cd2+by diatom frustules self-modified in situ with intercellular organic components | |
| Source Publication | ENVIRONMENTAL POLLUTION
 |
| ISSN | 0269-7491 |
| 2023-02-15 | |
| Volume | 319Pages:11 |
| DOI | 10.1016/j.envpol.2023.121005 |
| Language | 英语 |
| WOS Research Area | Environmental Sciences & Ecology |
| Abstract | The organic modification of three-dimensional porous diatom frustules (biosilica) and their fossils (diatomite) is promising in heavy metal adsorption. However, the preparation of such materials involves complex processes, high costs, and environmental hazards. In this study, organic-biosilica composites based on in situ selfmodification of diatoms were prepared by freeze-drying pretreatment. Freeze-drying resulted in the release of the intercellular organic components of diatoms, followed by loading on the surface of their diatom frustules. The bio-adsorbent exhibits outstanding Cd2+ adsorption capacity (up to 220.3 mg/g). The adsorption isotherms fitted the Langmuir model and the maximum adsorption capacity was 4 times greater than that of diatom biosilica (54.1 mg/g). The adsorption kinetics of Cd2+ was adequately described by a pseudo-second-order model and reached equilibrium within 30 min. By combining focused ion beam thinning with transmission electron microscopy-energy dispersive X-ray spectroscopy, the internal structure of the composite and the Cd2+ distribution were investigated. The results showed that the organic matter of the composite adsorbed approximately 10 times more Cd2+ than inorganic biosilica. The adsorption mechanism was dominated by complexation between the abundant organic functional groups (amide, carboxyl, and amino groups) on the surfaces of composite and Cd2+. The bio-adsorbent was demonstrated to have wide applicability in the presence of competitive cations (Na+, K+, Ca2+, and Mg2+) and under a wide range of pH (3-10) conditions. Thus, the self-modification of diatoms offers a promising organic-inorganic composite for heavy metal remediation. |
| Keyword | Self-modified diatom Cd 2+adsorption Organic component Porous silica framework Focused ion beam (FIB) |
| WOS ID | WOS:000918292000001 |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/72491 |
| Collection | 中国科学院矿物学与成矿学重点实验室 |
| Corresponding Author | Liu, Dong |
| Affiliation | 1.Chinese Acad Sci, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou Inst Geochem,CAS Ctr Excellence Deep Ear, Guangzhou 510640, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Songshan Lake Mat Lab, Neutron Sci Platform, Dongguan 523808, Peoples R China 4.Univ Adelaide, Sch Chem Engn & Adv Mat, Adelaide, SA 5005, Australia 5.Xiamen Univ, State Key Lab Marine Environm Sci MEL, Xiamen 361012, Peoples R China 6.Guangdong Univ Technol, Sch Environm Sci & Engn, Guangzhou 510006, Peoples R China 7.Chinese Acad Sci, Inst Earth Sci, Guangzhou Inst Geochem, Wushan, Guangzhou 510640, Peoples R China |
| Recommended Citation GB/T 7714 | Li, Mengyuan,Liu, Dong,Wang, Shun,et al. Efficient removal of Cd2+by diatom frustules self-modified in situ with intercellular organic components[J]. ENVIRONMENTAL POLLUTION,2023,319:11. |
| APA | Li, Mengyuan.,Liu, Dong.,Wang, Shun.,Guo, Haozhe.,Losic, Dusan.,...&Yuan, Peng.(2023).Efficient removal of Cd2+by diatom frustules self-modified in situ with intercellular organic components.ENVIRONMENTAL POLLUTION,319,11. |
| MLA | Li, Mengyuan,et al."Efficient removal of Cd2+by diatom frustules self-modified in situ with intercellular organic components".ENVIRONMENTAL POLLUTION 319(2023):11. |
| Files in This Item: | There are no files associated with this item. | |||||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment