小麦秸秆生物炭制备及其对甲基橙的吸附性能研究

Preparation of wheat straw biochar and its adsorption performance for methyl orange

为探讨碱改性前后小麦秸秆生物炭对甲基橙的吸附性能,以小麦秸秆为原材料,通过隔绝氧气煅烧下得到小麦秸秆生物炭.将小麦秸秆生物炭用不同浓度的NaOH对其改性,对比改性前后小麦秸秆生物炭对甲基橙的吸附性能.吸附结果表明,在甲基橙浓度为10 mg/L、生物炭投加量为0.1 g时,小麦秸秆生物炭与1.0 mol/L NaOH改性后的生物炭对甲基橙的去除率分别为30.0%和83.9%.NaOH改性后的小麦秸秆生物炭比改性前的吸附效果更好.吸附热力学结果表明,小麦秸秆生物炭对甲基橙的吸附较符合Langmuir模型.动力学结果表明,小麦秸秆生物炭对甲基橙的吸附较符合准二级动力学方程.

To explore the adsorption properties of wheat straw biochar on methyl orange before and after alkali modification,wheat straw biochar was obtained by isolating oxygen and calcining it as raw material.Wheat straw biochar was modified with different concentrations of NaOH,and the adsorption properties of methyl orange on wheat straw biochar before and after modification were compared.The adsorption results showed that the removal rates of methyl orange by wheat straw biochar and 1.0 mol/L NaOH modified biochar were 30.0%and 83.9%,respectively,when the concentration of methyl orange was 10 mg/L and the dosage of biochar was 0.1 g.The adsorption effect of wheat straw biochar modified by NaOH was better than that before modification.The results of adsorption thermodynamics showed that the adsorption of methyl orange by wheat straw biochar was in accordance with the Langmuir model.The kinetic results showed that the adsorption of methyl orange by wheat straw biochar was more in line with the pseudo-second-order kinetic equation.