分子磁强化磁分离法脱除柴油中的碱性氮化合物

用氨水作沉淀剂与一定量的Fe2+和Fe3+反应制备了具有磁性的碱性氮脱除剂,研究了在外加磁场作用下其对柴油中碱性氮的脱除效果。结果表明,外加磁场的存在有利于碱性氮化合物在磁性物质上的吸附,可以大大提高碱性氮的脱除率。对碱性氮质量分数为65.6μg/g的模拟油样品,在反应温度为0℃、反应时间为10min、剂油质量比为0.06的条件下,在无外加磁场和螺线管电流强度为5A时,其碱性氮的脱除率分别为83.3%和94.0%。对碱性氮含量为45.4μg/g的实际柴油样品,在反应温度为0℃、反应时间为10min、剂油质量比为0.06的条件下,在无外加磁场和螺线管电流强度为5A时,其碱性氮的脱除率分别为72.0%和90.1%,油样的回收率分别为98.1%和98.9%。

Magnetization of GaAs Parabolic Quantum Dot by Variation Method

The magnetization of two interacting electrons confined in a quantum dot presented in a magnetic field had been calculated by solving the relative Hamiltonian using variational method. We had investigated the dependence of the magnetization on temperature, magnetic field strength and confining frequency. The singlet-triplet transitions in the ground state of the quantum dot spectra and the corresponding jumps in the magnetization curves had been shown. The comparisons show that our results are in very good agreement with reported works.