The bubble behavior is one of the key factors for the design and the process of aluminum reduction cell using inert anode.A see-through cell is constructed to investigate the bubble flow behavior and the electrolyte f...The bubble behavior is one of the key factors for the design and the process of aluminum reduction cell using inert anode.A see-through cell is constructed to investigate the bubble flow behavior and the electrolyte flow pattern induced by bubbles.The test results show that the electrolyte is driven by the bubble to move around the cathode,and also some vortices occur in local areas.The bubble generated at the anode bottom undergoes the processes of formation,growth,sliding,detachment and coalescence.However,the bubble generated at the middle of anode detaches rapidly from the anode surface and moves upward and collides with other bubbles,which results in coalescence or break-up.Most bubbles are released into the atmosphere at the liquid surface,while some other bubbles taken by the electrolyte flush to the height higher than the mean horizontal level of the liquid and then drop down and move horizontally and they are released finally.Some bubbles are kept unbroken and are sliding on the electrolyte surface.The diameter of bubble generated at inert anode is smaller than that of bubble generated at graphite anode.Moreover,the bubbles on inert anode are spherical,which was different from those in tubular or disk form on graphite anode.展开更多
研究了N-氨乙基-γ-氨丙基三甲氧基硅烷在水溶液中以单层形式负载于磁铁矿纳米颗粒表面的方法,并研究了单分子层硅烷负载磁铁矿纳米颗粒吸附剂(monolayer of silane on magnetite nanoparticles,MSMNPs)的除磷性能.结果表明,在低浓度下...研究了N-氨乙基-γ-氨丙基三甲氧基硅烷在水溶液中以单层形式负载于磁铁矿纳米颗粒表面的方法,并研究了单分子层硅烷负载磁铁矿纳米颗粒吸附剂(monolayer of silane on magnetite nanoparticles,MSMNPs)的除磷性能.结果表明,在低浓度下(平衡浓度小于300 mg·L^(-1))硅烷在磁铁矿纳米颗粒表面产生单层吸附,而反应温度90℃以上或离子强度0.1 mol·L^(-1)NaCl以上可以使单层硅烷在磁铁矿纳米颗粒表面的覆盖度达到~100%.FTIR和XPS图谱显示负载的硅烷以化学键的形式与磁铁矿纳米颗粒表面相结合.单层硅烷负载不引起磁性强度的明显变化.MSMNPs对磷的吸附等温线更符合Langmuir模型,拟合得到的最大吸附量为7.59 mg·g^(-1).由于磷吸附位位于MSMNPs的最外面,磷的吸附及脱附均很快,30 min内达到90%以上,1 h内达到平衡.因此,MSMNPs是一种易分离因而可反复使用,并且可快速吸附与脱附污染物的新型吸附剂.展开更多
基金Projects(51304216,51371161)supported by the National Natural Science Foundation of China
文摘The bubble behavior is one of the key factors for the design and the process of aluminum reduction cell using inert anode.A see-through cell is constructed to investigate the bubble flow behavior and the electrolyte flow pattern induced by bubbles.The test results show that the electrolyte is driven by the bubble to move around the cathode,and also some vortices occur in local areas.The bubble generated at the anode bottom undergoes the processes of formation,growth,sliding,detachment and coalescence.However,the bubble generated at the middle of anode detaches rapidly from the anode surface and moves upward and collides with other bubbles,which results in coalescence or break-up.Most bubbles are released into the atmosphere at the liquid surface,while some other bubbles taken by the electrolyte flush to the height higher than the mean horizontal level of the liquid and then drop down and move horizontally and they are released finally.Some bubbles are kept unbroken and are sliding on the electrolyte surface.The diameter of bubble generated at inert anode is smaller than that of bubble generated at graphite anode.Moreover,the bubbles on inert anode are spherical,which was different from those in tubular or disk form on graphite anode.
