{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T01:16:51Z","timestamp":1788225411772,"version":"build-2803163510"},"reference-count":134,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2026,8,31]],"date-time":"2026-08-31T00:00:00Z","timestamp":1788134400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Heilongjiang Institute of Technology Provincial Undergraduate Basic Research Fund Doctoral Research Fund Project","award":["2025-KYYWF-ZR0511"],"award-info":[{"award-number":["2025-KYYWF-ZR0511"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Direct air capture of CO2 (DAC) is an emerging engineered carbon removal technology designed to extract CO2 directly from ambient air and support long-term net-negative emission pathways. Unlike point-source carbon capture, DAC operates under ultradilute CO2 conditions, where the low partial pressure of CO2, large air-processing demand, humidity fluctuations, and regeneration energy requirements impose coupled thermodynamic, kinetic, and engineering constraints. While numerous reviews have addressed DAC materials or specific process configurations, a systematic account of how capture performance is progressively lost through the transition from molecular binding to material shaping, contactor operation, regeneration, and final storage remains lacking. This review fills this gap by adopting a performance-transfer framework that bridges capture chemistry, sorbent architecture, contactor engineering, and scalable deployment. We systematically survey the literature of the past decade across capture chemistries, sorbent design principles, structured contactors, regeneration strategies, and system integration, with a focus on studies that report cyclic working capacity, regeneration energy, and material stability under realistic conditions. Rather than enumerating material properties, we analyze the cascading losses introduced at each scale and identify the key bottlenecks limiting net carbon removal. Based on this analysis, we propose a staged roadmap from standardized material reporting to integrated DAC with carbon storage, aiming to guide future research toward verifiable and durable CO2 removal.<\/jats:p>","DOI":"10.3390\/molecules31173056","type":"journal-article","created":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T01:05:26Z","timestamp":1788224726000},"page":"3056","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Direct Air Capture of CO2: Mechanism-Guided Materials, Process Integration, and Scalable Carbon Removal"],"prefix":"10.3390","volume":"31","author":[{"given":"Xinyi","family":"Wei","sequence":"first","affiliation":[{"name":"North Alabama International College of Engineering and Technology, Guizhou University, Guiyang 550001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S. K.","family":"Kot-Cheung","sequence":"additional","affiliation":[{"name":"College of Science, Northeast Forestry University, Harbin 150040, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jing","family":"Sun","sequence":"additional","affiliation":[{"name":"College of Science, Northeast Forestry University, Harbin 150040, China"},{"name":"College of Science, Heilongjiang Institute of Technology, Harbin 150050, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"11840","DOI":"10.1021\/acs.chemrev.6b00173","article-title":"Direct Capture of CO2 from Ambient Air","volume":"116","author":"Murdock","year":"2016","journal-title":"Chem. 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