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

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

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We investigated the influence mechanism of N-doping for dissolved black carbon(DBC)photodegradation of organic pollutants.The degradation performance of N-doped dissolved black carbon(NDBC)for tetracycline(TC)(71%)is better than that for methylene blue(MB)(28%)under irradiation.These levels are both better than DBC degradation performances 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,N-doping increases the DBC band gap of 2.29 to 2.62 eV in NDBC,resulting in a higher separation efficiency of photo-generated electrons-holes in NDBC than in DBC.All these factors give NDBC stronger photodegradation performance for TC and MB than DBC.High-performance liquid chromatography-mass spectrometry(HPLC-MS)characterization and toxicity evaluation with the quantitative structure-activity relationship(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.

Dissolved black carbon(DBC)N-dopingOrganic pollutantsBand gapPhotodegradation

Yong GUO、Mengxia CHEN、Ting CHEN、Ying GUO、Zixuan XU、Guowei XU、Soukthakhane SINSONESACK、Keophoungeun KANMANY

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Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Ministry of Education,College of Environment,Hohai University,Nanjing 210093,China

State Key Laboratory of Pollution Control and Resource Reuse,Nanjing University,Nanjing 210023,China

Key Laboratory of Environmental Engineering of Jiangsu Province,Jiangsu Provincial Academy of Environmental Science,Nanjing 210036,China

Central Environmental Laboratory,Natural Resources and Environment Research Institute,Ministry of Natural Resources and Environment,Vientiane 999012,Laos

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Project of the State Key Laboratory of Pollution Control and Resource Reuse Foundation,Nanjing University江苏高校优势学科建设工程项目High-Performance Computing Center of Nanjing University

PCRRF21012

2024

浙江大学学报(英文版)(A辑:应用物理和工程)
浙江大学

浙江大学学报(英文版)(A辑:应用物理和工程)

CSTPCD
影响因子:0.556
ISSN:1673-565X
年,卷(期):2024.25(4)
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