玉米秸秆水热炭制备及其对水中阿特拉津吸附

为解决农业资源废弃物作物秸秆的综合利用及水体农药污染问题, 以玉米秸秆为原料, 采用水热炭化法制备水热炭, 并利用扫描电子显微镜(SEM)和Fourier变换红外光谱（FT-IR）法对玉米秸秆水热炭的表面形貌和官能团进行表征, 通过实验室模拟研究不同pH值、 离子强度、 初始浓度以及制备温度对玉米秸秆水热炭吸附水中阿特拉津的影响. 结果表明： 随着温度的升高， 水热炭产生炭微球结构和丰富的含氧官能团； 水热炭对阿特拉津的吸附动力学符合准二级动力学方程（R²≥0.970, P≤0.001）, 吸附热力学符合Langmuir方程（R²≥0.992, P≤0.001）, 为非线性吸附且自发进行的吸热反应； 玉米秸秆水热炭对水中阿特拉津最大吸附量（298 K）为8.862 mg/g, 最大去除率为69.74%； 水热炭对阿特拉津的吸附量随制备温度的升高而增加, 吸附量随溶液pH值和离子强度的增加而下降. 因此, 利用玉米秸秆制备的水热炭可有效吸附水中的阿特拉津, 具有较好的应用前景， 实验结果为玉米秸秆再利用和水体净化提供理论依据和数据支持.

Preparation of Hydrothermal Carbon of Cornstalks and Its Adsorption of Atrazine in Water

To solve the problem of comprehensive utilization of agricultural resources waste and pesticide pollution. The hydrothermal carbon was prepared by the hydrothermal carbonization method from cornstalks and characterized by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy.The effects of  different pH values,  ionic strength,  initial concentration  and different prepared temperatures on the adsorption of Atrazine by hydrothermal carbon of cornstalks  were  studied by laboratory simulation.The results show that with the increase of temperature,  hydrothermal carbon produced carbon microsphere structure and abundant oxygen-containing functional groups. The adsorption kinetics of hydrothermal carbon on Atrazine conforms to  the quasi-second-order kinetic equation (R²≥0.970,  P≤0.001), and the adsorption thermodynamics conforms to the Langmuir  equation (R²≥0.992,  P≤0.001 ), which is  a nonlinear adsorption and  spontaneous  endothermic reaction. The maximum adsorption capacity of hydrothermal carbon is   8.862 mg/g,  and the maximum removal rate is 69.74% at 298 K. The adsorption capacity of  Atrazine by hydrothermal carbon increases with the increase of prepared temperature, but decreases with the increase of pH value and ionic strength. Therefore, the hydrothemal carbon prepared from cornstalk can effectively adsorb Atrazine in water, which has a good application prospect. The experimental results provide theoretical basis and data support for reuse of  cornstalk and water purification.