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While incorporating nano-TiO2 into cementitious materials offers a promising photocatalytic remediation strategy, the coupled effects of pore-structure modification and curing age on the degradation efficiency remain underexplored. This study systematically investigated the NO gas degradation performance of nano-TiO2-modified cement paste by controlling the TiO2 content (3\u201312%), air-entraining agent content, water-cement ratio, and curing age. The results indicate that an optimal nano-TiO2 content of 6% yields the highest compressive strength. Meanwhile, higher nano-TiO2 content (up to 12%) significantly enhances NO removal (reaching 9.73%), but excessive air-entraining agents trap the photocatalyst, thereby reducing efficiency. Furthermore, increasing the water-cement ratio promotes gas diffusion, whereas prolonged curing densifies the matrix and obstructs UV-catalyst contact, decreasing the removal ratio by 20.3% at 28 days. Microstructural analyses elucidate that NO is photocatalytically oxidized into nitrate ions (NO3\u2212) without degrading the essential C\u2013S\u2013H gel. This study provides critical insights into the microstructural optimization of photocatalytic cements, offering a practical design framework for photocatalytic cements with potential for long-term environmental application, pending durability validation.<\/jats:p>","DOI":"10.3390\/ma19153214","type":"journal-article","created":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T07:55:41Z","timestamp":1785225341000},"page":"3214","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Study on Photocatalytic Degradation of NO Gas by Cement Paste Incorporated with Nano-TiO2"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5611-2165","authenticated-orcid":false,"given":"Zigeng","family":"Wang","sequence":"first","affiliation":[{"name":"Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China"},{"name":"State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tong","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7334-3712","authenticated-orcid":false,"given":"Yue","family":"Li","sequence":"additional","affiliation":[{"name":"Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenwei","family":"Gu","sequence":"additional","affiliation":[{"name":"China Road & Bridge Corporation, Beijing 100011, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,7,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1605838","DOI":"10.1002\/adma.201605838","article-title":"Non-Noble Metal-based Carbon Composites in Hydrogen Evolution Reaction: Fundamentals to Applications","volume":"29","author":"Wang","year":"2017","journal-title":"Adv. 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