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Volume 40 Issue 7
Sep.  2022
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2022  >  40(7): 9-17
ZHANG Kaijie, FENG Qian, SHANG Weichun, OU Zixuan, CAO Jiashun. SYNTHESIS OF CORE-SHELL CHITOSAN-Ag/TiO2 COMPOSITE BEADS FOR DEGRADATION OF IBUPROFEN[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(7): 9-17. doi: DOI:10.13205/j.hjgc.202207002
Citation: ZHANG Kaijie, FENG Qian, SHANG Weichun, OU Zixuan, CAO Jiashun. SYNTHESIS OF CORE-SHELL CHITOSAN-Ag/TiO2 COMPOSITE BEADS FOR DEGRADATION OF IBUPROFEN[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(7): 9-17. doi: DOI:10.13205/j.hjgc.202207002
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SYNTHESIS OF CORE-SHELL CHITOSAN-Ag/TiO2 COMPOSITE BEADS FOR DEGRADATION OF IBUPROFEN

doi: DOI:10.13205/j.hjgc.202207002

  • 1. College of Environment, Hohai University, Nanjing 210098, China;

  • 2. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, Hohai University, Nanjing 210098, China;

  • 3. Environmental Protection Science Research & Design Institute, Ningbo 315010, China

  • Received Date: 2021-05-13
    Available Online: 2022-09-02
    Abstract
  • For the current obstacles of low photocatalytic degradation efficiency of typical PPCPs such as ibuprofen and the limited reusability restricts,the organic core-inorganic shell structured chitosan-Ag/TiO2(CAT) composite beads were successfully synthesized using chitosan as the carrier and silver-doped TiO2 as the photocatalyst,and used for the degradation of ibuprofen.The results illustrated that chitosan agglomerated tightly to form a core,and the silver-doped TiO2 was distributed on the surface of the chitosan,eventually forming an organic core-inorganic shell structure.The composite beads showed a good removal efficiency on ibuprofen under UV irradiation.The ibuprofen removal efficiency of 96.1% was achievable in 60 min under optimal operational condition (catalyst load=4 mg/L,initial IBP concentration=1 mg/L,initial pH=6).The results showed that even after the fifth photocatalytic cycle,the removal efficiency after 60 min was still as high as 85.0%.Novel core (organic)-shell (inorganic) composite structure and the additional band above the valence band was created by the carbon-contain groups and the doped N species of chitosan,which could enhance the absorption,photocatalysis,stability and reusability of the CAT composite beads.The inorganic shell formed by doping Ag on the surface of TiO2 was wrapped on the surface of the organic core formed by chitosan.So photogenerated electrons transfer readily from TiO2 to Ag with heavy accumulation due to doping Ag on TiO2 surfaces,which may reduce the recombination of electron-hole pairs and thus enhance the photocatalytic efficiency.The reactive species scavenging experiments showed that·O2- mediated reactions and direct-hole oxidation were the major degradation reactions.
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