Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 전병훈 | - |
dc.date.accessioned | 2022-05-09T04:42:59Z | - |
dc.date.available | 2022-05-09T04:42:59Z | - |
dc.date.issued | 2020-09 | - |
dc.identifier.citation | APPLIED CATALYSIS B-ENVIRONMENTAL, v. 273, article no. 119034 | en_US |
dc.identifier.issn | 0926-3373 | - |
dc.identifier.issn | 1873-3883 | - |
dc.identifier.uri | https://www.sciencedirect.com/science/article/pii/S0926337320304495?via%3Dihub | - |
dc.identifier.uri | https://repository.hanyang.ac.kr/handle/20.500.11754/170672 | - |
dc.description.abstract | A new approach to determine the importance of band potential by comparing two different electron charge transfer mechanism, via Z-scheme and type-II heterojunction. Through microwave hydrothermal (MWH) treatment and subsequent thermal polycondensation, the released ammonia gas from the formation of oxidized GCN simultaneously reducing the surface of TiO2 (designated as mwh-CNTO), hence creating a sub-gap state between the interface of these two catalysts. Compared to pristine photocatalysts, mwh-CNTO-0.1 (0.1 g TiO2 with 6 g melamine) has shown superior photocatalytic activities (between 6 to 34-folds) under monochromatic LED (400 nm) and natural sunlight. Since TiO2 in the composite cannot be activated under LED, the bands alignment from type-II heterojunction decreases the overall band potential, resulting in mainly center dot O-2(-) (anionic) generated. Consequently, non-charged BPA was effectively degraded with a kinetic rate constant of 0.0310 min(-1), while negatively charged ATZ had much lower rate constant (0.0043 min(-1)) due to their repulsive properties. In contrast, natural sunlight (full spectrum) could not only activate both TiO2 and GCN of mwh-CNTO-0.1, but also induce Z-scheme mechanism via driving the photogenerated electrons (TiO2) through the created sub-gap state and ultimately recombining at valence band (VB) of GCN. As proven by detection of DMPO-center dot OH, scavenging tests and DFT modeling, this scheme effectively degraded both BPA (0.0379 min(-1)) and ATZ (0.0474 min(-1)) owing to the VB position of TiO2 being maintained to generate non-selective center dot OH. Overall, in comparison to other studies, the proposed Z-scheme on mwh-CNTO-0.1 had much higher energy efficiencies for BPA (8.2 x 10(-3) min(-1) W-1) and ATZ removal (1.0 x 10(-2) min(-1) W-1) under natural sunlight. | en_US |
dc.description.sponsorship | This research was supported by the National Research Foundation (NRF-2017 R1D1A1B03029441). Co-authors, Kayoung Yun and Seungchul Kim, were supported by the Institutional Project of Korea Institute of Science and Technology (2E29280). | en_US |
dc.language.iso | en | en_US |
dc.publisher | ELSEVIER | en_US |
dc.subject | Photocatalysis | en_US |
dc.subject | Organic pollutants | en_US |
dc.subject | Z-scheme | en_US |
dc.subject | Sunlight | en_US |
dc.subject | Microwave hydrothermal | en_US |
dc.subject | Treatment | en_US |
dc.title | Understanding the potential band position and e-/h(+) separation lifetime for Z-scheme and type-II heterojunction mechanisms for effective micropollutant mineralization: Comparative experimental and DFT studies | en_US |
dc.type | Article | en_US |
dc.relation.volume | 273 | - |
dc.identifier.doi | 10.1016/j.apcatb.2020.119034 | - |
dc.relation.page | 1-15 | - |
dc.relation.journal | APPLIED CATALYSIS B-ENVIRONMENTAL | - |
dc.contributor.googleauthor | Wong, Kien Tiek | - |
dc.contributor.googleauthor | Kim, Seung Chul | - |
dc.contributor.googleauthor | Yun, Kayoung | - |
dc.contributor.googleauthor | Choong, Choe Earn | - |
dc.contributor.googleauthor | Nah, In Wook | - |
dc.contributor.googleauthor | Jeon, Byong-Hun | - |
dc.contributor.googleauthor | Yoon, Yeomin | - |
dc.contributor.googleauthor | Jang, Min | - |
dc.relation.code | 2020054216 | - |
dc.sector.campus | S | - |
dc.sector.daehak | COLLEGE OF ENGINEERING[S] | - |
dc.sector.department | DEPARTMENT OF EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING | - |
dc.identifier.pid | bhjeon | - |
dc.identifier.orcid | https://orcid.org/0000-0002-5478-765X | - |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.