Journal of Zhejiang Agricultural Sciences ›› 2026, Vol. 67 ›› Issue (2): 488-494.DOI: 10.16178/j.issn.0528-9017.20250216

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Study on the adsorption performance of Thalia dealbata Fraser biochar for nitrogen and phosphorus in water bodies

JIANG Haoran1(), HUANG Yue2, LI Shuai1, YU Jiqian2, YING Shanshan1()   

  1. 1.College of Environment and Resources,Zhejiang A&F University,Hangzhou 311300,Zhejiang
    2.Hangzhou Agricultural Technology Extension Center,Hangzhou 310020,Zhejiang
  • Received:2025-03-20 Online:2026-02-28 Published:2026-03-07
  • Contact: YING Shanshan

Abstract:

The treatment of discarded aquatic plants is crucial for enabling ecological ditches to effectively intercept agricultural non-point source pollution. Biomass carbonization is a widely adopted method for the resource utilization of straw-type waste. This study selected Thalia dealbata Fraser,a common plant in ecological ditches,as the carbonization material to investigate the adsorption characteristics of biochar prepared under different carbonization temperatures(400,500,600 ℃)and hydrochloric acid modification methods. Material characterization revealed that both increasing carbonization temperature and hydrochloric acid modification significantly promoted pore formation in the biochar. The biochar carbonized at 400 ℃ and modified with hydrochloric acid demonstrated the best adsorption performance for $\mathrm{NO}_3^{-}$-N and $\mathrm{PO}_4^{3-}$,while the biochar carbonized at 600 ℃ and modified with hydrochloric acid showed the highest adsorption capacity for $\mathrm{NH}_4^{+}$-N. The biochar derived from Thalia dealbata Fraser exhibits water purification potential,with hydrochloric acid modification proving more effective than increasing carbonization temperature in enhancing adsorption capacity. This study provides technical support for the subsequent resource utilization of aquatic plants in ecological ditches.

Key words: Thalia dealbata Fraser, biochar, nitrogen, phosphorus, adsorption performance

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