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Herein, a dual\u2010functional aerogel integrating selective adsorption and catalytic oxidation is developed for ambient HCHO elimination. Specifically, Pt\u2010loaded hollow mesoporous MnO\n                    <jats:sub>2<\/jats:sub>\n                    (Pt@hmMnO\n                    <jats:sub>2<\/jats:sub>\n                    ) nanospheres are first synthesized, achieving 97.8% HCHO removal (1 mg\u00a0m\n                    <jats:sup>\u22123<\/jats:sup>\n                    ) under light through synergistic adsorption\u2010photothermal catalysis. A hierarchical porous aerogel architecture is constructed via a two\u2010step freezing method, embedding the Pt@hmMnO\u2082\/cellulose nanofibers (CNF) mixture within the unidirectionally frozen chitosan (CS) matrix. The obtained 3D framework (named as CS\/Pt\u2010CNF) features abundant \u2500NH\n                    <jats:sub>2<\/jats:sub>\n                    groups and through\u2010hole channels enabling selective HCHO capture and accumulation. The unique bilayer design achieves rapid HCHO reduction from 1 to 0.044 mg\u00a0m\n                    <jats:sup>\u22123<\/jats:sup>\n                    within 60\u00a0min, which is below the international standard (0.08 mg\u00a0m\n                    <jats:sup>\u22123<\/jats:sup>\n                    ). The pre\u2010concentration effect synergizes with the catalytic nanospheres to degrade adsorbed HCHO into CO\u2082 and H\u2082O, maintaining 97.4% efficiency after five cycles without adsorbent saturation. Mechanistic studies reveal that the macroporous CS layer facilitates gas diffusion while mesoporous Pt@hmMnO\n                    <jats:sub>2<\/jats:sub>\n                    ensures molecular activation, collectively enabling faster reaction kinetics than conventional powder catalysts. Such an eco\u2010friendly CS\/Pt\u2010CNF aerogel demonstrates the practical potential for enclosed environments through simultaneous pollutant confinement and destruction.\n                  <\/jats:p>","DOI":"10.1002\/smll.202503361","type":"journal-article","created":{"date-parts":[[2025,6,23]],"date-time":"2025-06-23T03:10:48Z","timestamp":1750648248000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Construction of Hierarchical Porous Composite Aerogel for High\u2010Efficient Removal of Low\u2010Level Gaseous Formaldehyde"],"prefix":"10.1002","volume":"21","author":[{"given":"Kangli","family":"Xu","sequence":"first","affiliation":[{"name":"State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences  1295 Ding\u2010Xi Road Shanghai 200050 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