论文部分内容阅读
本文选用铁树叶为原料,采用温和的水热法制备出生物质炭。采用傅里叶变换红外光谱(FT-IR)探讨材料的成分,研究了溶液的初始pH值、初始铀浓度、温度和时间对吸附铀性能的影响,并从吸附热力学、动力学方面分析水热炭对U(VI)的吸附过程,探讨其吸附机理。结果表明溶液pH对吸附量的影响尤为显著,当pH为7时达到最大吸附量(54.66 mg g-1);在30 min时达到吸附平衡;吸附量随温度升高而不断增大。动力学研究结果表明铀在水热炭上的吸附符合准二级动力学模型和Langmuir吸附等温方程,Langmuir饱和吸附容量为56.5 mg g-1;热力学研究结果显示ΔH0=34.67 kJ mol-1,ΔG0<0,吸附过程在考察温度范围内为自发的吸热反应过程。
In this paper, iron leaves were used as raw materials, and the biomass carbon was prepared by mild hydrothermal method. The composition of the materials was investigated by Fourier transform infrared spectroscopy (FT-IR). The effects of initial pH value, initial uranium concentration, temperature and time on the properties of adsorbed uranium were investigated. The hydrothermal and kinetic properties of hydrothermal Carbon adsorption of U (VI), to explore its adsorption mechanism. The results showed that the effect of solution pH on the adsorption capacity was particularly significant. The maximum adsorption capacity reached 54.66 mg g-1 at pH 7, and the adsorption equilibrium reached at 30 min. The adsorption capacity increased with the increase of temperature. The kinetic results show that the adsorption of uranium on hydrothermal carbon is in accordance with the quasi-second-order kinetic model and the Langmuir adsorption isotherm with the Langmuir adsorption capacity of 56.5 mg g-1. The thermodynamic study shows that ΔH0 = 34.67 kJ mol-1, ΔG0 <0, the adsorption process in the study of temperature range spontaneous endothermic reaction process.