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【目的】明确石墨纳米溶胶对钾的吸附特性及其对烟草钾吸收和钾离子流速的影响。【方法】采用等温吸附试验和水培试验,分析石墨纳米溶胶对钾的吸附特性及对烟草钾吸收的影响。【结果】1)石墨纳米溶胶对钾的等温吸附线用Langmuir方程能更好的拟合;石墨纳米溶胶对钾的吸附可分为快慢两个阶段,反应符合准二级动力学方程。随着温度升高,石墨纳米溶胶对钾的吸附量降低。在p H为7.0时,石墨纳米溶胶对钾的吸附量达到最大。2)适宜浓度石墨纳米溶胶能促进烟草对钾的吸收积累,当浓度为40 mg/L时,地上部钾含量达到最高;当浓度为5 mg/L时,地上部钾素积累量达到最高。3)随着浓度升高,石墨纳米溶胶在烟草根系表面的富集增强。在10 mg/L浓度下,烟草根系的钾离子流速由外流变为内流。【结论】石墨纳米溶胶有较强的吸附特性,能吸附在根系表面,影响根系钾离子吸收。
【Objective】 The purpose of this study was to determine the adsorption characteristics of potassium nano-sol on potassium and its effect on potassium uptake and potassium current in tobacco. 【Method】 The isothermal adsorption experiments and hydroponic experiments were used to analyze the adsorption characteristics of potassium on the adsorption of potassium and its effect on the absorption of potassium in tobacco. 【Result】 1) The adsorption isotherms of graphite nano-sols to potassium are better fitted by Langmuir equation. The adsorption of potassium on graphite nano-sols can be divided into two stages: fast and slow, and the reaction accords with quasi-second-order kinetic equation. With the increase of temperature, the adsorption capacity of graphite nano-sol to potassium decreased. When p H is 7.0, the adsorption capacity of graphite nanoparticle to potassium is the maximum. 2) Appropriate concentration of graphite nanosol can promote the accumulation of potassium in tobacco, and at the concentration of 40 mg / L, the content of potassium in aboveground reaches the highest; when the concentration is 5 mg / L, the accumulation of aboveground potassium reaches the highest. 3) With the increase of concentration, the enrichment of graphite nano-sol on the root surface of tobacco increased. At a concentration of 10 mg / L, the potassium current in tobacco roots changed from efflux to influx. 【Conclusion】 The graphite nano-sol has strong adsorption characteristics, which can adsorb on the surface of root system and affect the absorption of potassium ion in the root system.