{"corpus_id":145988767,"paper_sha":"13a1a80dad17d1e31b733e136d572210a36e3e27","doi":"10.1016/J.JTICE.2019.04.012","arxiv_id":null,"pmid":null,"pmcid":null,"mag_id":2939360577,"dblp_id":null,"acl_id":null,"title":"Highly efficient carbon quantum dot suspensions and membranes for sensitive/selective detection and adsorption/recovery of mercury ions from aqueous solutions","year":2019,"publication_date":"2019-07-01","venue":"Journal of the Taiwan Institute of Chemical Engineers / Elsevier","journal":{"name":"Journal of the Taiwan Institute of Chemical Engineers","pages":null,"volume":null},"journal_issn":null,"journal_title":null,"publication_types":[],"pubmed_pub_types":null,"s2_fields_of_study":["Materials Science","Chemistry","Environmental Science"],"reference_count":72,"citation_count":43,"influential_citation_count":1,"is_open_access":false,"arxiv_categories":null,"arxiv_license":null,"arxiv_journal_ref":null,"mesh_headings":null,"chemicals":null,"comments_corrections":null,"source_flags":1,"s2_open_access_pdf_url":null,"s2_open_access_landing_url":null,"s2_open_access_license":null,"s2_open_access_status":null,"pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"Abstract Nitrogen-doped carbon quantum dots (CQDs), synthesized through a solid-phase microwave-assisted pyrolysis of citric acid and urea at 250 °C, were employed as highly-selective/-sensitive probe as well as an efficient adsorbent toward Hg2+ ions that exist in aqueous solutions. The spherical CQDs possess a homogeneous dispersion with a narrow distribution, ranged from 2.5 to 5.5 nm. The fluorescence responses from CQD samples demonstrate triple band at ca. 450, 500 and 520 nm, influenced by the ratio of citric acid to urea in the carbon precursor. The fluorescence quenching ratio was found to be proportional to the Hg2+ concentration within the solution. Such a correlation was formulated using Stern–Volmer model. The detection limit of CQDs toward Hg2+ ions reached as high as 10 ppb, and the maximal adsorption capacity of Hg2+ onto CQDs was as high as 3.33 g/g, which is 1280, 6, and 16 times higher than the values reported for the active carbon, graphene, and carbon nanotubes, respectively. The CQD-coated polymeric membrane also exhibits the fluorescence quenching and it is easily regenerated by iodide anions for subsequent usages. Accordingly, the functionalized CQDs pave the pathway for engineering the adsorption and recovery of toxic Hg2+ contaminant that are present in aqueous solutions.","claims":[{"public_id":"cl_61efc1b308d8475044d31a5fc8ad233e","status":"active","text":"A CQD-coated polymeric membrane exhibits fluorescence quenching toward Hg2+ and can be regenerated by iodide anions for subsequent uses.","confidence":0.85,"contributors":[{"id":32,"public_id":"7c402c1b98","public_label":"뀨 (7c402c1b98)","roles":["extraction"],"url":"https://sah.borca.ai/u/7c402c1b98"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["review"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_61efc1b308d8475044d31a5fc8ad233e"},{"public_id":"cl_c42d12815b114156e7f2be56f791a85b","status":"active","text":"Nitrogen-doped carbon quantum dots (CQDs) synthesized via solid-phase microwave-assisted pyrolysis of citric acid and urea at 250 °C serve as a highly selective and sensitive fluorescence probe and an efficient adsorbent for Hg2+ ions in aqueous solutions.","confidence":0.95,"contributors":[{"id":32,"public_id":"7c402c1b98","public_label":"뀨 (7c402c1b98)","roles":["extraction"],"url":"https://sah.borca.ai/u/7c402c1b98"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["review"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_c42d12815b114156e7f2be56f791a85b"},{"public_id":"cl_aea69c7752219083f0e2c773507ae7db","status":"active","text":"The fluorescence quenching ratio of the CQDs is proportional to Hg2+ concentration and follows the Stern–Volmer model, with a detection limit of 10 ppb.","confidence":0.9,"contributors":[{"id":32,"public_id":"7c402c1b98","public_label":"뀨 (7c402c1b98)","roles":["extraction"],"url":"https://sah.borca.ai/u/7c402c1b98"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["review"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_aea69c7752219083f0e2c773507ae7db"},{"public_id":"cl_21cdf7f4585010a8155914b25d998a7d","status":"active","text":"The maximal adsorption capacity of Hg2+ onto the CQDs is 3.33 g/g, which is 1280, 6, and 16 times higher than active carbon, graphene, and carbon nanotubes, respectively.","confidence":0.95,"contributors":[{"id":32,"public_id":"7c402c1b98","public_label":"뀨 (7c402c1b98)","roles":["extraction"],"url":"https://sah.borca.ai/u/7c402c1b98"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["review"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_21cdf7f4585010a8155914b25d998a7d"}],"concepts":[{"public_id":"co_04ae14dd954d0c73d1725d9d13280b82","status":"active","name":"Hg2+ ions","description":"Mercury ions in aqueous solution that are detected and adsorbed by the carbon quantum dots.","types":["analyte","contaminant"],"aliases":["mercury ions"],"contributors":[{"id":32,"public_id":"7c402c1b98","public_label":"뀨 (7c402c1b98)","roles":["extraction"],"url":"https://sah.borca.ai/u/7c402c1b98"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["review"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/concepts/co_04ae14dd954d0c73d1725d9d13280b82"},{"public_id":"co_11fccf8984d95d5ebb7873917f7683de","status":"active","name":"CQD-coated polymeric membrane","description":"A membrane coated with carbon quantum dots that exhibits fluorescence quenching toward Hg2+ and is regenerable with iodide anions.","types":["device","material"],"aliases":[],"contributors":[{"id":32,"public_id":"7c402c1b98","public_label":"뀨 (7c402c1b98)","roles":["extraction"],"url":"https://sah.borca.ai/u/7c402c1b98"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["review"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/concepts/co_11fccf8984d95d5ebb7873917f7683de"},{"public_id":"co_28128a33339cf4a80c6345e8bc7c1d53","status":"active","name":"Stern–Volmer model","description":"The model used to formulate the correlation between fluorescence quenching ratio and Hg2+ concentration.","types":["model"],"aliases":[],"contributors":[{"id":32,"public_id":"7c402c1b98","public_label":"뀨 (7c402c1b98)","roles":["extraction"],"url":"https://sah.borca.ai/u/7c402c1b98"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["review"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/concepts/co_28128a33339cf4a80c6345e8bc7c1d53"},{"public_id":"co_3715fc0afa4ec48d766037b717904b8e","status":"active","name":"graphene","description":"A carbon-based material used for comparison; 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