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LBC8306

木虫 (小有名气)

自带超级无限释放无CD氧瓶超深

应助: 0 (幼儿园)
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在线: 157.3小时
虫号: 746609
注册: 2009-04-12
性别: GG
专业: 聚合物共混与复合材料

[求助] 求助(化学类)！！！！大家帮忙看看翻译的如何，改一改。

碳纳米管具有很高的热稳定性和化学惰性等独特的结构性质，被认为是一种良好的载体。以碳纳米管这种具有不同于普通材料特性的物质作为载体，负载氧化铝来制备能够高效吸附水溶液中铜离子的复合材料。探讨这种复合材料对水中铜离子的吸附性能。
采用把硝酸铝加入到碳纳米管的悬浮液中，然后加入氨水的方法来制备碳纳米管负载氧化铝材料(Al2O3/CNTs)。红外光谱及差热分析表明，氧化铝以γ-Al2O3的形态负载到碳纳米管上，碳纳米管负载氧化铝后，热稳定性降低。通过负载量优化发现，负载量为50%时，Al2O3/CNTs吸附量最大。溶液的pH值对Al2O3/CNTs的吸附能力有显著影响，对铜离子的吸附能力随着pH值的降低而降低。随着铜离子溶液初始浓度的增大，Al2O3/CNTs吸附量逐渐增加，而吸附率逐渐降低。
热力学研究表明，铜离子在Al2O3/CNTs上的吸附是一个自发的、放热、熵增过程。Langmuir吸附模型可以很好的描述吸附过程。从Langmuir吸附等温线得出，Al2O3/CNTs对铜离子的最大吸附能力Qmax为44.445 mg/g。动力学研究表明，该吸附行为可以由准二级速率方程很好地描述。
Carbon nanotubes with unique morphologis such as high thermal stability and chemically inert nature, is considered a good carrier. Carbon nanotubes being a novel kind of carriers for its difference from common ones were studied to efficiently remove copper ion in water by supported alumina. There is discussion on the adsorption mechanism of this composite absorbent which was used to absorb copper ions in water.
The composite absorbent, carbon nanotubes supported alumina materials (Al2O3/CNTs), was prepared through putting aluminium nitrate into suspension of carbon nanotubes, and then a certain ammonia was added. IR and differential thermal analysis(DTA) showed that there isγ-Al2O3 loading on carbon nanotubes. After carbon nanotubes supported alumina, thermal stability is reduced. When 50% alumina is supported, Al2O3/CNTs had a high adsorption capacity. Different solution pH value make a difference. Adsorption of copper ions of Al2O3/CNTs decreased with the decrease of pH. As the initial concentration of the copper ions solution increased, Al2O3/CNTs adsorption increased while adsorption rate reduced.
Thermodynamics of copper ions on Al2O3/CNTs showed that this adsorption process was spontaneous, exothermic and with an increase in entropy. Langmuir adsorption model is better for this adsorption process. From Langmuir adsorption isotherm, maximum adsorption capacity Qmax was determined as 44.445 mg/g. Research on adsorption kinetics elucidate that this adsorption could be described by pseudo-second-order kinetics models well.

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