State Environment Protection Engineering Center for Urban Soil Contamination Control and Remediation, Shanghai Academy of Environmental Sciences, Shanghai 200233, China E-mail:
Water Sci Technol. 2024 Apr;89(8):1981-1995. doi: 10.2166/wst.2024.112. Epub 2024 Apr 4.
Biochar (BC) was used to remove trichloroethylene (TCE) from soil and water phases, and BC modification changed the sorption behavior of pollutants. Microplastics are emerging pollutants in the soil and water phases. Whether microplastics can affect the sorption of TCE by modified BC is not clear. Thus, batch sorption kinetics and isotherm experiments were conducted to elucidate the sorption of TCE on BC, and BC combined with polyethylene (PE) or polystyrene (PS). The results showed that HCl and NaOH modification increased TCE sorption on BC, while HNO modification inhibited TCE sorption on BC. When PE/PS and BC coexisted, the TCE sorption capacity decreased significantly on BC-CK + PE, BC-HCl + PE, BC-HNO + PE, BC-NaOH + PE, and BC-NaOH + PS, which was likely due to the preferential sorption of PE/PS on BC samples. We concluded that microplastics can change TCE sorption behavior and inhibit TCE sorption on BC samples. Thus, the interaction of BC and microplastics should be considered when BC is used for TCE removal in soil and water remediation.
生物炭（BC）被用于去除土壤和水相中三氯乙烯（TCE），并且 BC 的改性改变了污染物的吸附行为。微塑料是土壤和水相中的新兴污染物。微塑料是否会影响改性 BC 对 TCE 的吸附尚不清楚。因此，进行了批量吸附动力学和等温线实验，以阐明 TCE 在 BC 上的吸附，以及 BC 与聚乙烯（PE）或聚苯乙烯（PS）的结合。结果表明，HCl 和 NaOH 改性增加了 TCE 在 BC 上的吸附，而 HNO3 改性抑制了 TCE 在 BC 上的吸附。当 PE/PS 和 BC 共存时，BC-CK+PE、BC-HCl+PE、BC-HNO3+PE、BC-NaOH+PE 和 BC-NaOH+PS 上的 TCE 吸附容量显著降低，这可能是由于 PE/PS 优先吸附在 BC 样品上。我们得出结论，微塑料可以改变 TCE 的吸附行为并抑制 TCE 在 BC 样品上的吸附。因此，在使用 BC 去除土壤和水中的 TCE 进行修复时，应考虑 BC 和微塑料的相互作用。
