不同热解温度及材料来源的生物质炭对水中硝氮的吸附作用研究

采用批次实验方法研究了热解温度和生物质材料来源对制备的生物质炭吸附水体中硝氮吸附特征的影响。结果表明,准一级动力学方程对生物质炭吸附硝氮的动力学过程的拟合效果最好;生物质炭吸附硝氮的热力学过程符合线性分配方程。生物质炭对硝氮的吸附机制以物理吸附为主,多种吸附机制为辅,且各生物质炭对硝氮均具有很好的吸附能力;虽然热解温度和材料来源对吸附速率和吸附能力具有一定的影响,但是并不改变其吸附机制。热解温度越高,生物质炭对硝氮的吸附越易发生而且吸附量越大;不同原材料制备的生物质炭中,玉米秸秆炭对硝氮的吸附量最大,其次为树枝炭。

Study of Adsorption of Nitrate Nitrogen in Water on Biomass Charcoals Derived from Different Pyrolysis Temperatures and Sources

Batch experiment method was used to study the effect of adsorption absorption characteristics of the nitrate nitrogen in the water on biomass charcoals derived from different pyrolysis temperatures and biomass material sources.The results showed that the adsorption dynamics process of nitrate nitrogen on biomass charcoals could be described in terms of pseudo-first-order kinetic equation; the adsorption thermodynamics process of nitrate nitrogen on biomass charcoals is correlated to the linear distribution equation.The main adsorption mechanism of nitrate nitrogen on biomass carbon is physical adsorption and the process is influenced by a variety of adsorption mechanisms. The biomass carbons all have good adsorption capability of nitrate nitrogen.Although either the pyrolysis temperature or material source has a certain impact on the adsorption rate and adsorption capacity , neither of the facter alters the adsorption mechanism.The adsorption quantity of nitrate-nitrogen on biomass carbon increases with higher pyrolysis temperature.Among the biomass carbons derived from different raw materials, corn straw charcoal has the largest adsorption quantity of nitrate-nitrogen, followed by the charcoal derived from branches.