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The adsorption of Dy3+, Tb3+, and Hg2+ ions onto adsorbent surfaces in model salt solutions was tested. The adsorption was evaluated in terms of adsorption efficiency (%), adsorption capacity (mg\/g), and desorption efficiency (%) based on the results of inductively coupled plasma optical emission spectrometry (ICP-OES). Both adsorbents, \u03b3Fe2O3@SiO2\u2013NH2 and CoFe2O4@SiO2\u2013NH2, showed high adsorption efficiency toward Dy3+, Tb3+, and Hg2+ ions, ranging from 83% to 98%, while the adsorption capacity reached the following values of Dy3+, Tb3+, and Hg2+, in descending order: Tb (4.7 mg\/g) &gt; Dy (4.0 mg\/g) &gt; Hg (2.1 mg\/g) for \u03b3Fe2O3@SiO2\u2013NH2; and Tb (6.2 mg\/g) &gt; Dy (4.7 mg\/g) &gt; Hg (1.2 mg\/g) for CoFe2O4@SiO2\u2013NH2. The results of the desorption with 100% of the desorbed Dy3+, Tb3+, and Hg2+ ions in an acidic medium indicated the reusability of both adsorbents. A cytotoxicity assessment of the adsorbents on human-skeletal-muscle derived cells (SKMDCs), human fibroblasts, murine macrophage cells (RAW264.7), and human-umbilical-vein endothelial cells (HUVECs) was conducted. The survival, mortality, and hatching percentages of zebrafish embryos were monitored. All the nanoparticles showed no toxicity in the zebrafish embryos until 96 hpf, even at a high concentration of 500 mg\/L.<\/jats:p>","DOI":"10.3390\/ijms241210072","type":"journal-article","created":{"date-parts":[[2023,6,14]],"date-time":"2023-06-14T01:32:15Z","timestamp":1686706335000},"page":"10072","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Superparamagnetic Spinel-Ferrite Nano-Adsorbents Adapted for Hg2+, Dy3+, Tb3+ Removal\/Recycling: Synthesis, Characterization, and Assessment of Toxicity"],"prefix":"10.3390","volume":"24","author":[{"given":"A. F. P.","family":"Allwin Mabes Raj","sequence":"first","affiliation":[{"name":"Jo\u017eef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia"},{"name":"Department of Environmental Science, Jo\u017eef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia"},{"name":"Institute for Environmental Protection and Sensors (IOS) Ltd., Beloruska 7, 2000 Maribor, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maja","family":"Bauman","sequence":"additional","affiliation":[{"name":"Institute for Environmental Protection and Sensors (IOS) Ltd., Beloruska 7, 2000 Maribor, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nena","family":"Dimitru\u0161ev","sequence":"additional","affiliation":[{"name":"Institute for Environmental Protection and Sensors (IOS) Ltd., Beloruska 7, 2000 Maribor, Slovenia"},{"name":"Faculty for Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1176-5335","authenticated-orcid":false,"given":"Lamiaa M. A.","family":"Ali","sequence":"additional","affiliation":[{"name":"IBMM, Univ Montpellier, CNRS, ENSCM, 34293 Montpellier, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M\u00e9lanie","family":"Onofre","sequence":"additional","affiliation":[{"name":"IBMM, Univ Montpellier, CNRS, ENSCM, 34293 Montpellier, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9641-212X","authenticated-orcid":false,"given":"Magali","family":"Gary-Bobo","sequence":"additional","affiliation":[{"name":"IBMM, Univ Montpellier, CNRS, ENSCM, 34293 Montpellier, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4606-2576","authenticated-orcid":false,"given":"Jean-Olivier","family":"Durand","sequence":"additional","affiliation":[{"name":"ICGM, Univ Montpellier, CNRS, ENSCM, 34293 Montpellier, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aleksandra","family":"Lobnik","sequence":"additional","affiliation":[{"name":"Institute for Environmental Protection and Sensors (IOS) Ltd., Beloruska 7, 2000 Maribor, Slovenia"},{"name":"Faculty for Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aljo\u0161a","family":"Ko\u0161ak","sequence":"additional","affiliation":[{"name":"Faculty for Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,6,13]]},"reference":[{"key":"ref_1","unstructured":"European Commission (2023, March 31). 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