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Polylactic acid degradable mulching film modified by N-TiO2/g-C3N4 photocatalyst for removal of carbendazim in water and soil under visible light
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DOI：10.1016/j.jenvman.2025.125135.png)
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Abstract
En 中文
Non-degradable plastic mulching films and pesticide residues pose significant environmental pollution and ecological challenges. In this work, polylactic acid mulch film (PLA-MF) was successfully modified by nitrogen-doping titanium dioxide (N-TiO2) and g-C3N4 composites (N-TiO2/g-C3N4, defined as g-CNNT), which was used for the photocatalytic degradation of carbendazim (CBD) in water and soil under visible light irradiation. In water system, the PLA-MF/g-CNNT exhibited excellent photocatalytic performance for CBD removal with the 99 % of degradation efficiency after 7 h. Active oxidative species played primarily roles for CBD degradation with the contributions of center dot O-2(-) > h+ > center dot OH by electron paramagnetic resonance (EPR). The proposed degradation pathway for CBD involved hydroxylation, demethylation, decarboxylation, and deamination, ultimately leading to its mineralization into CO2, H2O, NH3, and NH4+. In the soil system (with moisture contents of 70-80 % and a soil thickness of 0.5-1 mm), the degradation efficiency of CBD reached 50-60 % after 8 h. In addition, pot experiments confirmed that PLA-MF/g-CNNT system could promote Chinese white cabbage's growth compared with traditional plastic mulching film. Meanwhile, g-CNNT and PLA-MF/g-CNNT could facilitate the improvement on the contents of microbial carbon and microbial nitrogen, total carbon and total nitrogen in soil. This study proposes a promising approach for the removal of pesticide residues in surface water and soil using photocatalytic technology integrated with degradable mulch films.
Keywords:
Carbendazim
Polylactic acid mulching film
Photocatalysis
Soil remediation
N-TiO2/g-C3N4
Photocatalysis
Soil remediation
Journal
IF:
8.4
Papers:
2.8W
Citations:
13.7W
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Cited Papers