花生壳生物炭对土壤吸附邻苯二甲酸二甲酯的影响

Effect of Adding Peanut Shell-derived Biochar to Soil on Sorption of Dimethyl Phthalate

采用限氧升温法在不同的炭化温度和时间下制备4种花生壳生物炭,考察其对土壤吸附邻苯二甲酸二甲酯（Dimethyl phthalate,DMP）的影响。结果表明,添加生物炭能显著提高土壤对DMP的吸附能力。Langmuir模型和Freundlich模型均能较好的拟合添加生物炭土壤对DMP的吸附,相关系数分别介于0.90-1.00和0.95-0.99之间。随着生物炭添加量的增加,土壤对DMP的吸附能力明显增强且非线性特征更加突出;在生物炭高添加量条件下,炭化温度高且炭化时间长的生物炭对土壤吸附能力的增强作用更为显著。在Ce=0.001 Sw和Ce=0.01 Sw条件下,生物炭对土壤吸附DMP的贡献率分别介于80.80%-98.58%和67.30%-96.37%之间,表明生物炭对土壤吸附DMP发挥着主导作用。

Four kinds of peanut shell-derived biochars, prepared under different pyrolytic temperatures and time, were added to soil to investigate their effects on the sorption of dimethyl phthalate （DMP）. The results showed that adding biochar to soil significantly enhanced soil sorption capacity of DMP. Langmuir and Freundlich equation were suited to describe adsorption characteristics of DMP by soil added with biochar, with high correlation coefficient of 0.90 - 1.00 and 0.95 - 0.99, respectively. With the increase of bioehar application amount, the sorption affinity and degree of isotherm nonlinearity increased obviously. Under high amount of biochar application, there was larger sorption capacity of DMP by soil added with biochar prepared under higher temperature and longer time. At Ce = 0.001 Sw and 0.01Sw, the contributions of biochar to DMP sorption were 80.80% - 98.58% and 67.30% - 96.37%, respectively, which showed that biochar played an important role in soil sorption of DMP.