KOH和微波辐照改性满江红生物炭对水中U(Ⅵ)的吸附

Adsorption of U(Ⅵ)in Water Using Modified Azolla Imbircata Biocarbon by KOH Immersion and Microwave Irradiation

研究了以野生满江红为原料制备满江红生物炭(AIC),再经KOH浸泡和微波辐照获得改性满江红生物炭(K-M-AIC)并用以吸附溶液中的U(Ⅵ),借助扫描电子显微镜、傅里叶红外光谱仪、元素分析表征了AIC、K-M-AIC及吸附U(Ⅵ)后的K-M-AIC的结构和性能,考察了K-M-AIC用量、体系pH、反应时间、初始U(Ⅵ)质量浓度对K-M-AIC吸附U(Ⅵ)的影响,采用准一级和准二级动力学模型、Langmuir和Freundlich等温吸附模型分析了吸附过程。结果表明:在体系pH=5、初始U(Ⅵ)质量浓度10 mg/L、K-M-AIC用量0.133 g/L、温度30℃条件下,U(Ⅵ)最大吸附量为124.903 mg/g;吸附过程更符合准二级动力学模型和Langmuir等温吸附模型。K-M-AIC生物材料可用于从溶液中吸附去除U(Ⅵ)。

Preparation of azolla imbircata biocarbonbon(AIC)using wild Manjianghong as raw material was studied,and the modified azolla imbircata biocarbonbon(K-M-AIC)was obtained by KOH immersion and microwave irradiation and used to adsorb U(Ⅵ)in the solution.The structure and properties of AIC,K-M-AIC and K-M-AIC after adsorption of U(Ⅵ)were characterized by SEM,FT-IR and elemental analysis.The effects of K-M-AIC dosage,system pH,reaction time and initial mass concentration of U(Ⅵ)on the adsorption were investigated.The quasi-first and quasi-second-order kinetic models,Langmuir and Freundlich isotherm adsorption models were used to analyze the adsorption process.The results show that under the conditions of pH=5,initial U(Ⅵ)mass concentration of 10 mg/L,K-M-AIC dosage of 0.133 g/L and temperature of 30℃,the maximum adsorption capacity of U(Ⅵ)is 124.903 mg/g.The adsorption process is more consistent with the quasi-second-order kinetic model and Langmuir isothermal adsorption model.K-M-AIC biomaterials can be used to adsorb and remove U(Ⅵ)from solution.