Citation: Qingtao CHEN, Xiangdong SHI, Xianghai RAO, Jiong LI, Xiaoyun QIN, Yiwen GUAN, Binyan ZOU, Guixia LIU, Fenghua CHEN. Employing polydopamine as an electron bridge to construct an S-scheme heterojunction and flexible film for highly efficient photocatalytic degradation of water pollutants[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(4): 747-759. doi: 10.11862/CJIC.20250286 shu

Employing polydopamine as an electron bridge to construct an S-scheme heterojunction and flexible film for highly efficient photocatalytic degradation of water pollutants

1.
College of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China
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School of New Materials, Luohe Vocational and Technical College, Luohe, Henan 462000, China
3.
School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, China

Corresponding author: Xiangdong SHI, shi13461185233@163.com Fenghua CHEN, phenix@zzuli.edu.cn
Received Date: 13 September 2025
Revised Date: 2 February 2026

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To address the issue of low interfacial charge transfer efficiency in heterojunction photocatalysts, an S-scheme heterojunction photocatalyst based on polydopamine (PDA) electron bridges was constructed. A powdered S-scheme heterojunction photocatalyst, designated as g-C₃N₄@PDA-Bi₄Ti₃O₁₂ (CN@PDA-BTO), was fabricated via electrostatic assembly of Bi₄Ti₃O₁₂ onto PDA-modified graphitic carbon nitride (g-C₃N₄). Photocatalytic degradation experiments, photoluminescence spectroscopy, and electrochemical measurements revealed that PDA serves as an electron transport "bridge", significantly enhancing the interfacial contact and charge separation between g-C₃N₄ and Bi₄Ti₃O₁₂. The optimized sample CN@PDA-BTO-20 achieved degradation rates of 98.2% for methylene blue (MB) within 60 min and 81.1% for tetracycline hydrochloride (TCH) within 90 min under visible light irradiation, with reaction rate constants markedly higher than those of the single-component and binary composites. Furthermore, to overcome the difficulty of recycling powdered catalysts, the optimal CN@PDA-BTO powder was immobilized within a polyvinyl alcohol (PVA) hydrogel network, resulting in a flexible film designated as CN@PDA-BTO-PVA. The composite film maintained the degradation rates of 77.5% for MB and 71.6% for TCH after five consecutive cycles, demonstrating significantly improved stability and recyclability.
- g-C₃N₄,
- Bi₄Ti₃O₁₂,
- S-scheme heterojunction,
- polydopamine,
- photocatalytic degradation
1. [1]
  YU G L, SUN Q F, YANG Y, CHEN S, LONG Y N, LI Y F, GE S Y, ZHENG D. BiOCl-based composites for photocatalytic degradation of antibiotics: A review of synthesis method, modification, factors affecting photodegradation and toxicity assessment[J]. J. Alloy. Compd., 2024, 981: 173733 doi: 10.1016/j.jallcom.2024.173733
2. [2]
  TANJI K, EL MRABET I, FAHOUL Y, JELLAL I, BENjELLOUN M, BELGHITI M, EL HAJAM M, NACIRI Y, EL GAIDOUMI A, EL BALI B, ZAITAN H, KHERBECHE A. Epigrammatic progress on the photocatalytic properties of ZnO and TiO₂ based hydroxyapatite@photocatlyst toward organic molecules photodegradation: A review[J]. J. Water Process. Eng., 2023, 53: 103682 doi: 10.1016/j.jwpe.2023.103682
3. [3]
  ZHAO Y B, CHANG L, LI Y Y, HE W J, LIU K L, CUI M J, HAMEED M U, XIE J Y. High-gravity photocatalytic degradation of tetracycline hydrochloride under simulated sunlight[J]. J. Water Process. Eng., 2023, 53: 103753 doi: 10.1016/j.jwpe.2023.103753
4. [4]
  BI R X, LIU X, LEI L, PENG Z H, WANG X X, ZHANG L, LIANG R P, QIU J D. Core-shell MOF@COF photocatalysts for synergistic enhanced U(Ⅵ) and tetracycline cleanup through space and carrier separation[J]. Chem. Eng. J., 2024, 485: 150026 doi: 10.1016/j.cej.2024.150026
5. [5]
  LI J X, XIE Y L. Enhanced separation performance of g-C₃N₄/Ag₃PO₄ heterojunction photocatalyst for efficient degradation of methylene blue and bisphenol A[J]. J. Alloy. Compd., 2024, 1005: 176115
6. [6]
  ZHANG X, BAI Y S, CHANG X, ZHANG H, ZHANG H Y, PENG L M, HUANG S S. Preparation and photocatalytic degradation performance of rhodamine B of BiOCl/polyaniline[J]. Chinese J. Inorg. Chem., 2025, 41(5): 913-922 doi: 10.11862/CJIC.20240255
7. [7]
  LU Y, FU M J, CHENG C, YANG H C, NI X Y, GUO J Y, CAO S H. High-efficiency and stable Z-scheme heterojunction of Co₉S₈ anchored by g‑C₃N₄ for peroxymonosulfate activation[J]. J. Environ. Chem. Eng., 2024, 12(6): 114524 doi: 10.1016/j.jece.2024.114524
8. [8]
  DENG X Y, LUO R, ZHU G, SHI X Y, HAO W J, FAN J C, BI Q Y, LI G S. Molten-salt-chemistry-assisted synthesis of heterostructured g-C₃N₄/BiOI nanocomposites with enhanced sunlight absorption properties for efficient solar-to-chemical energy conversion[J]. J. Alloy. Compd., 2024, 1009: 176910
9. [9]
  SHAHSAVANDI F, AMIRJANI A, HOSSEINI H R M. Plasmon‑ enhanced photocatalytic activity in the visible range using AgNPs/polydopamine/graphitic carbon nitride nanocomposite[J]. Appl. Surf. Sci., 2022, 585: 152728 doi: 10.1016/j.apsusc.2022.152728
10. [10]
  LI N, NIU Y H, AN W A, LIU Z H, RUAN F Y, FAN G D. Unraveling charge transfer dynamics in AgBr/Bi₄Ti₃O₁₂/Bi₂Sn₂O₇ ternary S-scheme heterojunction photocatalyst[J]. J. Colloid Interface Sci., 2024, 669: 175-189 doi: 10.1016/j.jcis.2024.04.216
11. [11]
  MENG F Y, QIN Y Y, LU J, LIN X Y, MENG M J, SUN G, YAN Y S. Biomimetic design and synthesis of visible-light-driven g-C₃N₄ nanotube@polydopamine/NiCo-layered double hydroxides composite photocatalysts for improved photocatalytic hydrogen evolution activity[J]. J. Colloid Interface Sci., 2021, 584: 464-473 doi: 10.1016/j.jcis.2020.10.007
12. [12]
  GUO F R, CHEN J C, ZHAO J Z, CHEN Z, XIA D S, ZHAN Z L, WANG Q. Z-scheme heterojunction g-C₃N₄@PDA/BiOBr with biomimetic polydopamine as electron transfer mediators for enhanced visible-light driven degradation of sulfamethoxazole[J]. Chem. Eng. J., 2020, 386: 124014 doi: 10.1016/j.cej.2020.124014
13. [13]
  LI Z X, LI C, LIU X M, WANG N N, LIU X W, MA L. Simultaneous treatment of trace pollutant and compound pollution using an effective n-ZnO@p-LaFeO₃/3DOM SiO₂ photocatalyst[J]. Sep. Purif. Technol., 2025, 354: 128714 doi: 10.1016/j.seppur.2024.128714
14. [14]
  TANDORN S, LAMKHAO S, THIRAPHATCHOTIPHUM C, RUJIJANAGUL G, RANDORN C. Fabrication of a bifunctionalized photocatalyst/hydrogel composite for the degradation of particulate matter (PM)-bound polycyclic aromatic hydrocarbons (PAHs)[J]. Chem. Eng. J., 2023, 457: 141190 doi: 10.1016/j.cej.2022.141190
15. [15]
  GAO X Q, AI L C, WANG L L, JU Y W, LIU S, WANG J, FAN H. The stable and elastic graphitic carbon nitride/polyvinyl alcohol photocatalytic composite sponge: Simple synthesis and application for wastewater treatment[J]. J. Environ. Chem. Eng., 2022, 10(3): 107814 doi: 10.1016/j.jece.2022.107814
16. [16]
  WU C Y, ZUO H R, ZHANG S Y, ZHAO S J, DU H Y, YAN Q S. A novel strategy to construct a direct Z-Scheme Bi@Bi₂O₂CO₃/g-C₃N₄ heterojunction catalyst via PDA electronic bridge[J]. Sep. Purif. Technol., 2022, 294: 121242 doi: 10.1016/j.seppur.2022.121242
17. [17]
  YANG D, WANG W J, ZHAO X Y, ZHOU Z Y, REN H J, CHEN Y, ZHAO Z F, AN K, JIANG Z Y. Synthesis of high-efficient g-C₃N₄/polydopamine/CdS nanophotocatalyst based on bioinspired adhesion and chelation[J]. Mater. Res. Bull., 2020, 131: 110970 doi: 10.1016/j.materresbull.2020.110970
18. [18]
  GE M N, ZHANG J F, QI Y Y, ZHAO Y, ZHANG L, LI G Y, GAO Z F, HUANG Z, VAN DER BRUGGEN B. Impact of graphitic carbon nitride/polydopamine on permeance and antifouling performance of reverse osmosis membranes[J]. Sep. Purif. Technol., 2025, 360: 130949 doi: 10.1016/j.seppur.2024.130949
19. [19]
  GONG Z H, CHEN L, CHEN K D, GOU S Y, ZHAO X, SONG L J, MA J, HAN L. Significantly improved photocatalytic H₂O₂ generation over PDA-modified g-C₃N₄ via promoting charge-carriers separation and oxygen adsorption[J]. J. Environ. Chem. Eng., 2023, 11: 109405 doi: 10.1016/j.jece.2023.109405
20. [20]
  PARASURAMAN B, SHANMUGAM P, BARVEEN N R, GNANASEKARAN L, BOONYUEN S, VENKATESAN N, THANGAVELU P. Advanced engineering of smart nanomaterials: ZnWO₄/CoWO₄/g‑C₃N₄ heterojunction photocatalysts for environmental and biomedical application[J]. J. Alloy. Compd., 2025, 1010: 178200
21. [21]
  DEEKSHA, KOUR P, AHMED I, YADAV C S, SHARMA S K, YADAV K. BiFeO₃/g-C₃N₄/f-CNF ternary nanocomposite as an efficient photocatalyst for methylene blue dye degradation under solar light irradiation[J]. J. Alloy. Compd., 2023, 960: 171073 doi: 10.1016/j.jallcom.2023.171073
22. [22]
  LI X H, YU Z X, SHAO L Y, ZENG H J, LIU Y C, FENG X F. A novel strategy to construct a visible-light-driven Z-scheme (ZnAl-LDH with active phase/g-C₃N₄) heterojunction catalyst via polydopamine bridge (a similar "bridge" structure)[J]. J. Hazard. Mater., 2020, 386: 121650 doi: 10.1016/j.jhazmat.2019.121650
23. [23]
  PHAT DAO T, HUONG VU T, DUC BUI V, GNANASEKARAN L, AMINABHAVI T M, VASSEGHIAN Y, JOO S W. Photocatalytic degradation of organophosphorus pesticide (terbufos) in aqueous solutions using 3D-printed TaSe₂/g-C₃N₄ nanocomposites[J]. Chem. Eng. J., 2024, 501: 157469 doi: 10.1016/j.cej.2024.157469
24. [24]
  WEI Y, LIU Y B, LIU C, LI X, ZHAO G H, LIU R H, WANG H Y, JIANG Y Y, ZHANG Y L, GAO Y H, SHI G F, WANG G Y. Construction of oxygen-doped g-C₃N₄/BiOCl (S-scheme) heterojunction: Efficient degradation of tetracycline in wastewater[J]. J. Environ. Chem. Eng., 2024, 12: 113354 doi: 10.1016/j.jece.2024.113354
25. [25]
  ZHAO S, CHEN D Y, LI N J, XU Q F, LI H, LU J M. Ti₃C₂ MXene-induced interface charge transferred in Z-scheme heterojunction for efficient photocatalytic removal of nitric oxide[J]. J. Alloy. Compd., 2023, 960: 170830 doi: 10.1016/j.jallcom.2023.170830
26. [26]
  WU J, XU J J, CHEN M D. Interfacial oxygen vacancy engineering of double Z‑scheme heterojunction Bi₂MoO₆/MnWO₄/g‑C₃N₄ for efficient photocatalytic degradation of iodohydrin[J]. Sep. Purif. Technol., 2025, 354: 128759 doi: 10.1016/j.seppur.2024.128759
27. [27]
  CHENG X G, GAO T C, LI X Y, GAO S W, WANG C B, GUO D Y. Enhanced visible‑light photocatalytic performance of hollow Bi/Bi₄Ti₃O₁₂ microspheres assembled with Bi₄Ti₃O₁₂ nanosheets and Bi nanodots synthesized by hydrothermal method[J]. J. Alloy. Compd., 2025, 1010: 177483
28. [28]
  SHEN S H, GAO Q, HU Z P, FAN D D. A fingerprint-like supramolecular-assembled Ag₃PO₄/polydopamine/g-C₃N₄ heterojunction nanocomposite for enhanced solar-driven oxygen evolution in vivo[J]. J. Colloid Interface Sci., 2024, 663: 212-226 doi: 10.1016/j.jcis.2024.02.087
29. [29]
  ONWUDIWE D C, OLATUNDE O C, NKWE V M, OYEWO O A, MULIWA A M, FERjANI H, YOUSEF T A. Synthesis of p-n GCN/CuBi₂O₄ heterostructures for enhanced visible light photocatalysis[J]. Inorg. Chem. Commun., 2024, 162: 112193 doi: 10.1016/j.inoche.2024.112193
30. [30]
  GUO F, SHI W L, WANG H B, HUANG H, LIU Y, KANG Z H. Fabrication of a CuBi₂O₄/g-C₃N₄ p-n heterojunction with enhanced visible light photocatalytic efficiency toward tetracycline degradation[J]. Inorg. Chem. Front., 2017, 4: 1714-1720 doi: 10.1039/C7QI00402H
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