SYNTHESIS OF CORE-SHELL CHITOSAN-Ag/TiO<sub>2</sub> COMPOSITE BEADS FOR DEGRADATION OF IBUPROFEN

ZHANG Kaijie; FENG Qian; SHANG Weichun; OU Zixuan; CAO Jiashun

doi:DOI:10.13205/j.hjgc.202207002

Volume 40 Issue 7

Sep. 2022

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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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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

ZHANG Kaijie^1,2,
FENG Qian^{1,2
,
,},
SHANG Weichun³,
OU Zixuan^1,2,
CAO Jiashun^1,2

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

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.
- chitosan,
- Ag/TiO₂ composite bead,
- ibuprofen,
- core-shell structure,
- photocatalytic degradation,
- nitrogen doped

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References(29)

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