1 洛阳理工学院环境工程与化学学院, 洛阳 471023
2 三杰节能新材料股份有限公司, 洛阳 471132
3 江苏龙净科杰环保技术有限公司, 盐城 224001
以KMnO4和MnSO4·H2O为原料, 在常温常压和水热条件下制备新生态MnO2, 借助XRD、TEM、低温N2吸附-脱附等手段对材料进行表征, 比较不同制备方法对产物结构和吸附性能的影响。结果表明, 反应温度和压力对新生态MnO2的形貌和吸附性能有较大影响, 常温常压下合成产物均为短棒状, 水热合成产物为介孔纤维, 对2,4-二硝基苯酚的吸附效果优于常温常压合成产物。新生态MnO2对2,4-二硝基苯酚的等温吸附和吸附动力学分别符合Langmuir等温式(R2>0.99)和准二级吸附动力学方程(R2>0.99), 说明2,4-二硝基苯酚在新生态MnO2上为单分子层吸附和化学吸附。溶液pH值能显著影响2,4-二硝基苯酚在新生态MnO2上的吸附, 在pH=7时最大吸附量为2.539 mg/g。
新生态MnO2 2,4-二硝基苯酚 单分子吸附 化学吸附 水热条件 形貌 动力学 active manganese dioxide 2,4-dinitrophenol monolayer adsorption chemical adsorption hydrothermal condition morphology kinetics
Author Affiliations
Abstract
1 School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
2 Laboratory of Optical Information Technology, Wuhan Institute of Technology, Wuhan 430205, China
Using the classical-trajectory Monte Carlo model, we have theoretically studied the angular momentum distribution of frustrated tunneling ionization (FTI) of atoms in strong laser fields. Our results show that the angular momentum distribution of the FTI events exhibits a double-hump structure. With this classical model, we back traced the tunneling coordinates, i.e., the tunneling time and initial transverse momentum at tunneling ionization. It is shown that for the events tunneling ionized at the rising edge of the electric field, the final angular momentum exhibits a strong dependence on the initial transverse momentum at tunneling. While for the events ionized at the falling edge, there is a relatively harder recollision between the returning electron and the parent ion, leading to the angular momentum losing the correlation with the initial transverse momentum. Our study suggests that the angular momentum of the FTI events could be manipulated by controlling the initial coordinates of the tunneling ionization.
020.2649 Strong field laser physics 020.4180 Multiphoton processes 320.7110 Ultrafast nonlinear optics Chinese Optics Letters
2018, 16(4): 040202
