{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T10:03:13Z","timestamp":1790330593484,"version":"4.1.0"},"reference-count":41,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T00:00:00Z","timestamp":1790294400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Guangxi Science and Technology Major Project","award":["AA23073018"],"award-info":[{"award-number":["AA23073018"]}]},{"name":"Special Fund for Science and Technology Development of Guangxi","award":["AD25069078"],"award-info":[{"award-number":["AD25069078"]}]},{"name":"Natural Science Foundation of Guang-xi","award":["2025GXNSFAA069186"],"award-info":[{"award-number":["2025GXNSFAA069186"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Aiming at the challenging selective separation of zirconium (Zr) and scandium (Sc) in hydrochloric acid systems, this study designed a Zr-SBA-15-30 adsorbent featuring abundant surface oxygen vacancy defects. The as-synthesized material possesses an ordered mesoporous structure, a high specific surface area of 477.606 m2\/g, and a high density of surface oxygen vacancies. In a strongly acidic binary HCl solution containing both Zr and Sc, Zr-SBA-15-30 exhibited exceptional separation performance, achieving an adsorption capacity of 128 mg\/g for Zr and an outstanding separation factor (SFSc\/Zr) as high as 3480. Fitting results from adsorption isotherms and kinetic models revealed that the adsorption process is predominantly governed by chemisorption and proceeds mainly via monolayer adsorption. The higher ionic character of the Zr-O bond relative to the Si-O bond, Zr doping induces a redistribution of the local electron cloud density on the framework surface, thereby forming electron-rich centers with higher polarizability and stronger coordination activity. Meanwhile, the oxygen vacancy defects introduced by plasma treatment create defect energy levels within the band gap. This synergistic effect of Zr doping and oxygen vacancies can significantly enhance the separation of Zr\/Sc. This work provides a viable material design strategy for the efficient separation of Zr and Sc under strongly acidic conditions.<\/jats:p>","DOI":"10.3390\/ma19194108","type":"journal-article","created":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T09:23:01Z","timestamp":1790328181000},"page":"4108","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Selective Adsorption Separation of Sc(III) and Zr(IV) from Acidic Solutions via Zr-SBA-15 with Rich Oxygen-Vacancy Defective"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-2598-2714","authenticated-orcid":false,"given":"Chuanxin","family":"Zhang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China"},{"name":"Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"conceptualization","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"}]},{"given":"Lei","family":"Shi","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China"},{"name":"Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"}]},{"given":"Zhonghao","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China"},{"name":"Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"}]},{"given":"Xinsheng","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China"},{"name":"Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"209602","DOI":"10.1016\/j.micromeso.2019.109602","article-title":"Synthesis of functional silica composite resin for the selective separation of zirconium from scandium","volume":"288","author":"Zhang","year":"2019","journal-title":"Microporous Mesoporous Mater."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"890","DOI":"10.1016\/j.jclepro.2017.09.199","article-title":"Selective separation of scandium from iron, aluminium and gold rich wastewater using various amino and non-amino functionalized silica gels-A comparative study","volume":"170","author":"Ramasamy","year":"2018","journal-title":"J. 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