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将稻壳分别在350℃和550℃热解温度下制备成生物质炭,按土壤质量的1%、3%和5%的添加量施入土壤中,保持一定的土壤含水率,探究施入生物炭的土壤对重金属锌吸附的影响。结果表明,土壤中施入生物炭之后,会提高土壤对重金属的吸附固定能力,生物炭的添加量越高,土壤对锌的最大吸附量越大。在试验开始阶段,随着生物炭的老化,土壤对锌的吸附性能会增强,同时土壤对锌的解吸率降低,随着时间的延长,生物炭与土壤发生的共腐殖化过程,导致土壤对锌的吸附性能逐渐降低,同时土壤对锌的解吸率提高。
The rice husk was prepared into biomass carbon at 350 ℃ and pyrolysis temperature of 550 ℃ respectively, and applied to the soil at 1%, 3% and 5% of the soil quality to maintain a certain soil moisture content. Effect of Biochar Soils on Adsorption of Heavy Metal Zinc. The results showed that after the biochar was applied into the soil, the adsorption capacity of soil to heavy metals was increased. The higher the biochar addition, the greater the maximum adsorption capacity of zinc to the soil. At the beginning of the experiment, with the aging of biochar, the adsorption capacity of soil to zinc increased, meanwhile, the desorption rate of soil to zinc decreased. With the extension of time, the co-humification of biochar and soil resulted in soil Adsorption of zinc on the gradual decrease, while soil desorption rate of zinc increased.