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为了考察黑碳对土壤中呋喃丹吸附与解吸行为的影响,选取小麦秸秆,分别在250℃、450℃和850℃下制备黑碳,测定了黑碳的比表面积和孔体积;采用批处理振荡法测定了呋喃丹在人工添加黑碳土壤中的吸附-解吸行为。结果表明,随制备温度升高,黑碳的比表面积、孔体积和微孔率增大;人工添加黑碳的土壤对呋喃丹的吸附容量和吸附强度随黑碳添加量增加而逐步增加,吸附和解吸等温线的非线性也逐步明显。添加高温制备黑碳的土壤比添加低温制备黑碳的土壤吸附容量、吸附和解吸的非线性均增加。吸附农药的解吸迟滞作用与土壤中黑碳的质量分数密切相关,添加高温制备黑碳的土壤解吸迟滞现象明显。因此,土壤中添加黑碳在一定程度上保证了土壤使用的安全性。
In order to investigate the effect of black carbon on the adsorption and desorption of carbofuran in soil, wheat straw was selected to prepare black carbon at 250 ℃, 450 ℃ and 850 ℃, respectively. The specific surface area and pore volume of black carbon were determined. Method was used to determine the adsorption-desorption behavior of carbofuran in artificially added black carbon soil. The results showed that the specific surface area, pore volume and microporosity of black carbon increased with the increase of preparation temperature. The adsorption capacity and adsorption strength of carbofuran by artificial black soil increased gradually with the addition of black carbon, and adsorption And the desorption isotherm non-linear gradually obvious. The soil adsorption capacity of black carbon added with high temperature was higher than that with black carbon added with low temperature, the nonlinearity of adsorption and desorption increased. The desorption effect of adsorbed pesticides is closely related to the mass fraction of black carbon in soil, and the phenomenon of delayed desorption of soil by adding high-temperature black carbon is obvious. Therefore, adding black carbon to the soil to a certain extent, to ensure the safety of soil use.