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By using p-phenylenediamine with different numbers and locations of heterocyclic nitrogen atoms as a precursor, five types of COFs with different nitrogen positions were synthesized. We found that Cr\u00ad(VI) photoreduction,Escherichia coli inactivation, and paracetamol degradation by COFs were heterocyclic nitrogen location-dependent. Particularly, the photocatalytic performance for all three tested pollutants by five types of COFs followed the order of the best performance for COF-PDZ with two ortho position heterocyclic N atoms, medium for COF-PMD with two meta position heterocyclic N atoms, and COF-PZ with two para position heterocyclic N atoms, and COF-PD with a single heterocyclic N atom, the worst performance for COF-1 without a heterocyclic N atom. Compared to the other COFs, COF-PDZ contained improved quantum efficiency and thus enhanced generation of electrons. The lower energy barriers and larger energy gaps of COF-PDZ contributed to its improved quantum efficiencies. The stronger affinity to Cr\u00ad(VI) with lower adsorption energy of COF-PDZ also contributed to its excellent Cr\u00ad(VI) reduction performance. By transferring into a more stable keto form, COF-PDZ showed great stability through five regeneration and reuse cycles. Overall, this study provided an insight into the synthesis of high-performance structure-dependent COF-based photocatalysts.<\/jats:p>","DOI":"10.1021\/acs.est.0c07857","type":"journal-article","created":{"date-parts":[[2021,3,19]],"date-time":"2021-03-19T16:29:00Z","timestamp":1616171340000},"page":"5371-5381","source":"Crossref","is-referenced-by-count":162,"title":["Tunable\nCovalent Organic Frameworks with Different\nHeterocyclic Nitrogen Locations for Efficient Cr(VI) Reduction,\n                    <i>Escherichia coli<\/i>\n                    Disinfection, and Paracetamol Degradation\nunder Visible-Light Irradiation"],"prefix":"10.1021","volume":"55","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9961-4218","authenticated-orcid":true,"given":"Fuyang","family":"Liu","sequence":"first","affiliation":[{"name":"Peking University , , ,","place":["Beijing, P. R. China, 100871"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiyao","family":"Ma","sequence":"additional","affiliation":[{"name":"Peking University , , ,","place":["Beijing, P. R. China, 100871"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuchen","family":"Deng","sequence":"additional","affiliation":[{"name":"Peking University , , ,","place":["Beijing, P. R. China, 100871"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3380-3534","authenticated-orcid":true,"given":"Meng","family":"Wang","sequence":"additional","affiliation":[{"name":"Peking University , , ,","place":["Beijing, P. R. China, 100871"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peng","family":"Zhou","sequence":"additional","affiliation":[{"name":"Peking University , , ,","place":["Beijing, P. R. 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