Composite film with adjustable number of layers for slow release of humic acid and soil remediation

Weicong Wang, Junming Shi, Keqi Qu, Xinrui Zhang, Wenjing Jiang, Zhanhua Huang, Zhanhu Guo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In this study, to improve the soil amendment performance of film materials, composite films with the adjustable number of layers and controlled slow-release time were prepared using sodium alginate (SA), chitosan (CS) and activated charcoal (AC) as raw materials. The prepared multilayer films exhibited a wide pH response range and excellent slow-release time. The cumulative release of humic acid (HA) increased from 19.87 ± 0.98% to 66.72 ± 1.06% with increasing the pH from 4.0 to 10.0 after 700 h of slow-release. In addition, after 50 d of remediation in red soil, plantation soil, and saline soil, the NH4+-N, Olsen-P, Olsen-K, and organic matter contents in the three soils were increased by 2.91–28.62 mg/kg, 46.97–70.43 mg/kg, 55.89–77.01 mg/kg, and 12.47–22.52 g/kg, respectively, and were able to provide sustained crop growth promotion effect. This study demonstrates the promising application of multilayer film in soil remediation and agricultural production.

Original languageEnglish
Article number114949
Number of pages9
JournalEnvironmental Research
Early online date7 Dec 2022
Publication statusPublished - 1 Feb 2023


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