{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T16:16:35Z","timestamp":1785428195329,"version":"3.56.0"},"reference-count":54,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2026,6,26]],"date-time":"2026-06-26T00:00:00Z","timestamp":1782432000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["42377076"],"award-info":[{"award-number":["42377076"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"award":["42377076"],"award-info":[{"award-number":["42377076"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100011791","name":"Natural Science Foundation of Jiangsu Province","doi-asserted-by":"publisher","award":["BK20250814"],"award-info":[{"award-number":["BK20250814"]}],"id":[{"id":"10.13039\/501100011791","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Key Laboratory of Advanced Nuclear Energy Design and Safety, Ministry of Education","award":["KLANETDS-KF-202514"],"award-info":[{"award-number":["KLANETDS-KF-202514"]}]},{"name":"Suzhou Fundamental Research Project","award":["SJC2023001"],"award-info":[{"award-number":["SJC2023001"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Photocatalytic extraction of uranium from radioactive wastewater is crucial for environmental safety and sustainable nuclear energy development. It is widely recognized that photocatalysts with donor-acceptor (D-A) or D-\u03c0-A structures exhibit enhanced charge separation efficiency, thereby showing excellent photocatalytic performance. Herein, we presented a counterintuitive design of a donor-donor covalent-organic framework (D-D COF) for efficient photocatalytic uranium extraction. A twisted D-D COF (COF-BCTB-Py) was synthesized via solvothermal condensation using bicarbazole and pyrene as dual electron-donor units. The COF featured a well-defined AA-stacked porous structure, high specific surface area (963 m2\u00b7g\u22121), suitable band gap (2.44 eV), and exceptional chemical, thermal, and radiation stability. Impressively, in the presence of 5% methanol, it delivered an ultrahigh uranium uptake capacity of 4278 mg\u00b7g\u22121 with fast kinetics and &gt;97% removal efficiency in complex water matrices, challenging the traditional stereotype of low-activity D-D COFs. Mechanistic studies revealed that soluble U(VI) was converted into crystalline (UO2)O2\u00b72H2O via in situ generated hydrogen peroxide rather than being reduced to U(IV). This work provides an unconventional design strategy to design efficient photocatalysts for uranium recovery from nuclear wastewater.<\/jats:p>","DOI":"10.3390\/molecules31132263","type":"journal-article","created":{"date-parts":[[2026,6,29]],"date-time":"2026-06-29T02:16:44Z","timestamp":1782699404000},"page":"2263","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Covalent-Organic Framework with Unconventional D-D Structure for Efficient Photocatalytic Uranium Extraction"],"prefix":"10.3390","volume":"31","author":[{"given":"Dongyang","family":"Xu","sequence":"first","affiliation":[{"name":"Key Laboratory of Nuclear Facility Decommissioning and Ecological Restoration of the Ministry of Ecology and Environment, School of Resources Environment and Safety Engineering, Hunan Provincial Engineering Research Center for Safety Control and Recycling of Radioactive Heavy Metal Pollutants, University of South China, 28 Changsheng West Road, Hengyang 421001, China"},{"name":"State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Biomedical Basic Research Center (BBRC) of Jiangsu, Soochow University, Suzhou 215123, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Du","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Biomedical Basic Research Center (BBRC) of Jiangsu, Soochow University, Suzhou 215123, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bingyue","family":"Zhou","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Biomedical Basic Research Center (BBRC) of Jiangsu, Soochow University, Suzhou 215123, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4694-6737","authenticated-orcid":false,"given":"Lixi","family":"Chen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Biomedical Basic Research Center (BBRC) of Jiangsu, Soochow University, Suzhou 215123, China"},{"name":"Key Laboratory of Advanced Nuclear Energy Design and Safety, Ministry of Education, University of South China, 28 Changsheng West Road, Hengyang 421001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mengyao","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Biomedical Basic Research Center (BBRC) of Jiangsu, Soochow University, Suzhou 215123, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qiang","family":"Wu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Advanced Nuclear Energy Design and Safety, Ministry of Education, University of South China, 28 Changsheng West Road, Hengyang 421001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Nuclear Facility Decommissioning and Ecological Restoration of the Ministry of Ecology and Environment, School of Resources Environment and Safety Engineering, Hunan Provincial Engineering Research Center for Safety Control and Recycling of Radioactive Heavy Metal Pollutants, University of South China, 28 Changsheng West Road, Hengyang 421001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-7001-9493","authenticated-orcid":false,"given":"Songbai","family":"Tang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Biomedical Basic Research Center (BBRC) of Jiangsu, Soochow University, Suzhou 215123, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3402-1830","authenticated-orcid":false,"given":"Guowen","family":"Peng","sequence":"additional","affiliation":[{"name":"Key Laboratory of Nuclear Facility Decommissioning and Ecological Restoration of the Ministry of Ecology and Environment, School of Resources Environment and Safety Engineering, Hunan Provincial Engineering Research Center for Safety Control and Recycling of Radioactive Heavy Metal Pollutants, University of South China, 28 Changsheng West Road, Hengyang 421001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,6,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"127851","DOI":"10.1016\/j.jhazmat.2021.127851","article-title":"Visible light driven photocatalytic removal of uranium(VI) in strongly acidic solution","volume":"426","author":"Chen","year":"2022","journal-title":"J. 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