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Effects of biochar on the phytotoxicity of polyvinyl chloride microplastics
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Researchers tested whether biochar made from corncob could reduce the harmful effects of polyvinyl chloride microplastics on lettuce grown in hydroponic conditions. They found that biochar adsorbed the microplastics and reduced their attachment to plant roots, improving lettuce growth and quality. The study suggests biochar could serve as a practical tool for mitigating microplastic toxicity in agricultural settings.
Polyvinyl chloride microplastics (PVC-MPs) are toxic to crops, resulting in economic losses during agricultural production. Owing to its strong adsorption capacity, biochar can effectively remove MPs from water. It is presumed that biochar can alleviate the phytotoxicity of PVC-MPs. To verify this hypothesis, the effects of different concentrations of corncob biochar (CCBC) on the phytotoxicity of PVC-MPs were investigated using hydroponic experiments. The results showed that PVC-MPs attached to lettuce roots substantially inhibited the growth and quality of lettuce. The tested CCBC adsorbed the PVC-MPs. At appropriate concentrations, CCBC alleviated the inhibitory effect of PVC-MPs on lettuce yield; however, it decreased some quality indicators. The single PVC-MPs induced oxidative damage to lettuce, as demonstrated by the increased hydrogen peroxide (HO) and malondialdehyde (MDA) content. Addition of CCBC considerably decreased the contents of HO and MDA in the lettuce shoots but increased the HO content in the roots. These findings indicate that CCBC may alleviate the adverse effects caused by PVC-MPs to the lettuce shoots but aggravate the toxic effects on the lettuce roots. This study provides a basis for understanding the removal of the phytotoxicity of MPs.
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Biochar-derived dissolved and particulate matter effects on the phytotoxicity of polyvinyl chloride nanoplastics
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Researchers investigated how dissolved and particulate matter released from biochar affects the toxicity of PVC nanoplastics to lettuce plants. They found that biochar-derived dissolved matter reduced nanoplastic toxicity by coating the plastic particles and limiting their uptake by roots, while particulate matter had a more complex effect. The study helps explain why biochar can protect plants from nanoplastic damage and provides insight into developing soil amendments for contaminated agricultural land.
Biochar alleviated the toxic effects of PVC microplastic in a soil-plant system by upregulating soil enzyme activities and microbial abundance
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Researchers tested whether adding biochar to soil could reduce the harmful effects of PVC microplastic contamination on plant growth and soil health. They found that biochar amendment increased plant biomass, restored soil enzyme activity, and boosted beneficial microbial populations that had been suppressed by the microplastics. The study suggests that biochar could serve as a practical tool for rehabilitating agricultural soils contaminated with plastic particles.
Biochar Reduces Nanoplastics Uptake by Lettuce and Alleviates Its Toxicity to the Plant
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Researchers tested whether biochar could reduce nanoplastic uptake by lettuce and found that iron-doped biochar was particularly effective, lowering nanoplastic concentrations in leaves by approximately 60%. Both regular and iron-doped biochar also helped alleviate nanoplastic-induced metabolic disturbances in the plants and partially restored soil enzyme activity.
Stress of polyethylene and polylactic acid microplastics on pakchoi（Brassica rapa subsp. chinensis） and soil bacteria: Biochar mitigation
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Researchers compared the effects of conventional polyethylene and biodegradable polylactic acid microplastics on pakchoi (a leafy vegetable) and found that both types harmed plant growth and disrupted soil bacteria. Adding biochar to the soil helped reduce these negative effects, suggesting it could be a practical way to protect crops from microplastic contamination in agricultural settings.
Evaluating the Role of Tobacco Stalk Biochar in Wheat Growth Under Microplastic Exposure
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Researchers conducted a two-factor pot experiment testing whether tobacco stalk biochar could mitigate the effects of polyethylene microplastics on wheat growth, finding that biochar addition restored soil pH and organic matter and partly reversed the physiological stress caused by microplastic exposure.
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