{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T22:20:08Z","timestamp":1787869208171,"version":"build-2784847793"},"reference-count":38,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2023,5,20]],"date-time":"2023-05-20T00:00:00Z","timestamp":1684540800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"PROCIENCIA","award":["177-2020-FONDECYT"],"award-info":[{"award-number":["177-2020-FONDECYT"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nanomaterials"],"abstract":"<jats:p>Real water remediation is an important issue that requires the development of novel adsorbents with remarkable adsorption properties, permitting reusability. In this work, the surface and adsorption properties of bare magnetic iron oxide nanoparticles were systematically studied, before and after the application of a maghemite nanoadsorbent in two real Peruvian effluents severely contaminated with Pb(II), Pb(IV), Fe(III), and others. We were able to describe the Fe and Pb adsorption mechanisms that occurred at the particle surface. 57Fe M\u00f6ssbauer and X-ray photoelectron spectroscopy results together with kinetic adsorption analyses gave evidence for two involved surface mechanisms: (i) surface deprotonation of maghemite nanoparticles (isoelectric point of pH = 2.3), forming Lewis sites bonding Pb complexes; and (ii) the formation of a thin inhomogeneous secondary layer of iron oxyhydroxide and adsorbed Pb compounds, as favored by surface physicochemical conditions. The magnetic nanoadsorbent enhanced the removal efficiency to values of ca. 96% and provided adsorptive properties with reusability due to the conserved morphological, structural, and magnetic properties. This makes it favorable for large-scale industrial applications.<\/jats:p>","DOI":"10.3390\/nano13101684","type":"journal-article","created":{"date-parts":[[2023,5,22]],"date-time":"2023-05-22T01:31:46Z","timestamp":1684719106000},"page":"1684","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Surface Adsorption Mechanism between Lead(II,IV) and Nanomaghemite Studied on Polluted Water Samples Collected from the Peruvian Rivers Mantaro and Cumbaza"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3293-7255","authenticated-orcid":false,"given":"Juan A.","family":"Ramos-Guivar","sequence":"first","affiliation":[{"name":"Grupo de Investigaci\u00f3n de Nanotecnolog\u00eda Aplicada Para la Biorremediaci\u00f3n Ambiental, Energ\u00eda, Biomedicina y Agricultura (NANOTECH), Facultad de Ciencias F\u00edsicas, Universidad Nacional Mayor de San Marcos, Av. Venezuela Cdra 34 S\/N, Ciudad Universitaria, Lima 01, Peru"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8898-2584","authenticated-orcid":false,"given":"Noemi-Raquel","family":"Checca-Huaman","sequence":"additional","affiliation":[{"name":"Centro Brasileiro de Pesquisas F\u00edsicas, Rio de Janeiro 22290-180, RJ, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5026-5563","authenticated-orcid":false,"given":"F. Jochen","family":"Litterst","sequence":"additional","affiliation":[{"name":"Institut fur Physik der Kondensierten Materie, Technische Universit\u00e4t Braunschweig, 38106 Braunschweig, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1310-2749","authenticated-orcid":false,"given":"Edson C.","family":"Passamani","sequence":"additional","affiliation":[{"name":"Departamento de F\u00edsica, Universidade Federal do Esp\u00edrito Santo -UFES, Vit\u00f3ria 29075-910, ES, Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,5,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"118209","DOI":"10.1016\/j.envpol.2021.118209","article-title":"A review of water pollution arising from agriculture and mining activities in Central Asia: Facts, causes and effects","volume":"291","author":"Liu","year":"2021","journal-title":"Environ. 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