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LBC8306木蟲(chóng) (小有名氣)
自帶超級(jí)無(wú)限釋放無(wú)CD氧瓶超深
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[求助]
求助(化學(xué)類)�。。�！大家?guī)兔纯捶g的如何，改一改。
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碳納米管具有很高的熱穩(wěn)定性和化學(xué)惰性等獨(dú)特的結(jié)構(gòu)性質(zhì)，被認(rèn)為是一種良好的載體。以碳納米管這種具有不同于普通材料特性的物質(zhì)作為載體，負(fù)載氧化鋁來(lái)制備能夠高效吸附水溶液中銅離子的復(fù)合材料。探討這種復(fù)合材料對(duì)水中銅離子的吸附性能。 采用把硝酸鋁加入到碳納米管的懸浮液中，然后加入氨水的方法來(lái)制備碳納米管負(fù)載氧化鋁材料(Al2O3/CNTs)。紅外光譜及差熱分析表明，氧化鋁以γ-Al2O3的形態(tài)負(fù)載到碳納米管上，碳納米管負(fù)載氧化鋁后，熱穩(wěn)定性降低。通過(guò)負(fù)載量?jī)?yōu)化發(fā)現(xiàn)，負(fù)載量為50%時(shí)，Al2O3/CNTs吸附量最大。溶液的pH值對(duì)Al2O3/CNTs的吸附能力有顯著影響，對(duì)銅離子的吸附能力隨著pH值的降低而降低。隨著銅離子溶液初始濃度的增大，Al2O3/CNTs吸附量逐漸增加，而吸附率逐漸降低。 熱力學(xué)研究表明，銅離子在Al2O3/CNTs上的吸附是一個(gè)自發(fā)的、放熱、熵增過(guò)程。Langmuir吸附模型可以很好的描述吸附過(guò)程。從Langmuir吸附等溫線得出，Al2O3/CNTs對(duì)銅離子的最大吸附能力Qmax為44.445 mg/g。動(dòng)力學(xué)研究表明，該吸附行為可以由準(zhǔn)二級(jí)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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8814402
至尊木蟲(chóng) (職業(yè)作家)
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【答案】應(yīng)助回帖
★ ★ ★ ★
sltmac(金幣+1): 謝謝交流~~ 2011-05-26 20:44:38
LBC8306(金幣+5): 非常感謝 2011-05-26 20:45:00
ringzhu(金幣+3, 翻譯EPI+1): 樓上家伙不厚道啊 有木有��！ 2011-05-27 20:17:58
sltmac(金幣+1): 謝謝交流~~ 2011-05-26 20:44:38
LBC8306(金幣+5): 非常感謝 2011-05-26 20:45:00
ringzhu(金幣+3, 翻譯EPI+1): 樓上家伙不厚道啊 有木有��！ 2011-05-27 20:17:58
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Carbon nanotubes with unique constitutive properties such as high thermal stability and chemically inert nature, is commonly considered a good carrier. Composite materials for removing copper ion in water can be prepared from loading alumina onto carbon nanotubes. Here is a discussion on the adsorption properties of this composite absorbent . The composite absorbent, alumina-supported carbon nanotubes materials (Al2O3/CNTs), was prepared through putting aluminium nitrate into suspension of carbon nanotubes and adding some ammonia. IR and differential thermal analysis(DTA) showed that alumina has been loaded onto carbon nanotubes in the form of γ-Al2O3 and that thermal stability of carbon nanotubes is reduced after loading alumina. The largest adsorption capacity of Al2O3/CNTs can be achieved when 50% alumina is loaded. Adsorption capacity Al2O3/CNTs varied at different solution pH and decreased with the decrease of pH. As the initial concentration of copper ion in solutions increased, Al2O3/CNTs adsorption increased while adsorption rate reduced. Thermodynamics of copper ions being adsorbed onto Al2O3/CNTs showed that the adsorption was a spontaneous and exothermic process with an increase in entropy. The adsorption process can be described well by Langmuir adsorption model. From Langmuir adsorption isotherm, maximum adsorption capacity Qmax of Al2O3/CNTs to copper ions was determined as 44.445 mg/g. Research on adsorption kinetics elucidate that this adsorption could be described by pseudo-second-order kinetics model well. |
3樓2011-05-26 16:12:41
zerohead
禁蟲(chóng) (職業(yè)作家)
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【答案】應(yīng)助回帖
LBC8306(金幣+1, 翻譯EPI+1): 謝謝 2011-05-26 16:03:49
LBC8306(金幣+9): 2011-05-28 18:10:47
LBC8306(金幣+9): 2011-05-28 18:10:47
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碳納米管具有很高的熱穩(wěn)定性和化學(xué)惰性等獨(dú)特的結(jié)構(gòu)性質(zhì)，被認(rèn)為是一種良好的載體。 這一句里的“結(jié)構(gòu)性質(zhì)”，不能用 morphology，morphology 是形貌的意思，跟微觀結(jié)構(gòu)不是一個(gè)概念。而且“熱穩(wěn)定性和化學(xué)惰性”，不是結(jié)構(gòu)，只能說(shuō)是特性，可用 characteristic 或 feature 。所以第一句要改為： With unique characteristics/features such as high thermal stability and chemically inert, carbon nanotubes is considered a good carrier. |
2樓2011-05-26 15:12:17
LBC8306
木蟲(chóng) (小有名氣)
自帶超級(jí)無(wú)限釋放無(wú)CD氧瓶超深
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- 注冊(cè): 2009-04-12
- 性別: GG
- 專業(yè): 聚合物共混與復(fù)合材料
4樓2011-05-28 18:15:30
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