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Journal of Zhejiang University SCIENCE A 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/jzus.A2300081


N-doping offers higher photodegradation performance of dissolved black carbon for organic pollutants: experimental and theoretical studies


Author(s):  Yong GUO, Mengxia CHEN, Ting CHEN, Ying GUO, Zixuan XU, Guowei XU, Soukthakhane SINSONESACK, Keophoungeun KANMANY

Affiliation(s):  Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210093, China; more

Corresponding email(s):   guoyong@hhu.edu.cn

Key Words:  Dissolved black carbon, N-Doping, Organic pollutants, Band gap, Photodegradation


Yong GUO, Mengxia CHEN, Ting CHEN, Ying GUO, Zixuan XU, Guowei XU, Soukthakhane SINSONESACK, Keophoungeun KANMANY. N-doping offers higher photodegradation performance of dissolved black carbon for organic pollutants: experimental and theoretical studies[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .

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%A Zixuan XU
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%A Keophoungeun KANMANY
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A1 - Keophoungeun KANMANY
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A2300081


Abstract: 
We investigated the influence mechanism of n-Doping for dissolved-black-carbon photodegradation of organic pollutants. The degradation performance of nitrogen-doped DBC (NDBC) for tetracycline (TC) (71%) is better than that for Methylene (MB) (28%) under irradiation. These levels are both better than DBC degradation performance for TC (68%) and MB (18%) under irradiation. Reactive species quenching experiments suggest that h+ and ·O2- are the main reactive species for NDBC photodegraded TC, while ·OH and h+ are the main reactive species for NDBC photodegraded MB. OH is not observed during DBC photodegradation of MB. This is likely because n-Doping increases valence-band (VB) energy from 1.55 eV in DBC to 2.04 eV in NDBC; the latter is strong enough to oxidize water to form ·OH. Additionally, nitrogen doping increases the DBC band gap of 2.29 eV to 2.62 eV in NDBC, resulting in a higher separation efficiency of photogenerated electrons and holes in NDBC than in DBC. All these factors give NDBC stronger photodegradation performance for TC and MB than DBC. HPLC-MS characterization and toxicity evaluation with the QSAR method suggest that TC photodegradation intermediates produced by NDBC have less aromatic structure and are less toxic than those produced by DBC. We adopted a theoretical approach to clarify the relationship between the surface groups of NDBC and the photoactive species produced. Our results add to the understanding of the photochemical behavior of NDBC.

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