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【請教】酸化碳納米管表面羧基含量的測定
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| 請教各位大俠怎么測定酸化碳納米管表面的羧基含量,感激不盡! |
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這個一般的活性炭的文獻(xiàn)上面都有,The titration was conducted by adding 200mg of adsorbents into a 200 ml flask containing 100 ml of the following 0.1 mol/L solutions: NaHCO3, Na2CO3, NaOH, and HCl. The flask was sealed and shaken at 298K for 2 days, and then filtered through a 0.45mm nylon fiber filter. The filtrate (10 ml) was pipetted and mixed with 15 ml of 0.1 mol/L HCl or NaOH. The excess of acid and base was titrated with 0.1 mol/L NaOH and HCl, respectively. The quantities of acidity of various types were determined from the assumption that NaHCO3 reacts with carboxylic groups, Na2CO3 reacts with carboxylic and lactonic groups, and NaOH reacts with carboxylic, lactonic and phenolic groups. The total basicity was determined from the amount of HCl reacted with the adsorbents.我隨便找的一個文獻(xiàn)《Kinetics and thermodynamics of adsorption of ionizable aromatic compounds from aqueous solutions by as-prepared and oxidized multiwalled carbon nanotubes》上面的步驟。 |
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文獻(xiàn)Chemical oxidation of multiwalled carbon nanotubes。CARBON 46 (2008) 833 – 840 3.4. Titration analysis A direct acid–base titration technique using NaOH was per- formed to determine the concentration of surface groups [29]. In Table 1, the mmol of acidic oxygen-containing surface groups per gram of CNT material are given as a function of chemical treatment. The titration experiments demonstrate that an increase in severity of the oxidation results in an in- crease in the concentration of acidic surface sites, from 1.8mmol/g on pristine tubes to 3.7mmol/g on nitric acid- treated material. These results are in full agreement with the XPS data (Fig. 4). |
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我也在找相同的問題,這是我收集的網(wǎng)友的答案。沒驗證,僅供參考。 羧基 這個專門有個方法的。有一本《腐植酸產(chǎn)品分析及檢驗》好像是,里面有檢驗方法 看了cc中有定量測定碳納米管羧基的方法,文獻(xiàn)自己找找看。 電導(dǎo)電位滴定也許可以 如果官能團(tuán)豐富,可以考慮用博漢姆滴定 勃姆滴定法 羧基是在什么溫度分解 電導(dǎo)滴定法應(yīng)該可以測量羧基含量 看一下TG,和純的碳管比較,看失重,但是不準(zhǔn),只能大約算一下 準(zhǔn)確定量現(xiàn)在還不現(xiàn)實,半定量方法很多,比如PT Zeta電位分析 傅里葉變換紅外光譜法定量分析氧化纖維素中的羧基含量 http://www.ilib.cn/Article.aspx?AIT=QCode&AI=fxyq200503011&A=fxyq200503011 紅外要在聚合物上選擇參比基團(tuán)進(jìn)行定量分析,當(dāng)然用滴定酸值方法會更準(zhǔn)確些. 紅外吸收光譜 物理方法:使用紅外光譜是鑒別羧基的方法: 羧基有對稱和不對稱伸縮振動會出現(xiàn)兩個強(qiáng)峰相距約60cm-1 ,例如: 羧酸鹽-COO- 1610-1550cm-1,1420-1300cm-1 紅外 1700左右的羰基振動峰 原子光譜 本科測得羥基含量用的是 滴定法,你查看一下 高分子材料表征 這個書籍,上面有介紹。 09考驗舉報此信息 小弟最近在測定某一高分子中羧基的含量,使用的是“羅丹明6G染色”的辦法,但是關(guān)于用哪種儀器檢測甚是苦惱。 很多文獻(xiàn)中只說“根據(jù)一篇1962年的文獻(xiàn)中報道的方法”,而這篇1962年的文獻(xiàn)使用的是“photoelectric spectrophotometer( 光電分光光度計)”并有“stoppered cell”。有極個別的文獻(xiàn)給出了檢測設(shè)備,經(jīng)本人查閱為紫外可見分光光度計。 于是小弟就困惑了,這個“光電分光光度計”等同于“紫外可見分光光度計”還是“熒光分光光度計”,貌似只有熒光分光光度計才配有stoppered cell? 請使用過該方法的同學(xué)給小弟指點一二,在此謝過! 酸值 發(fā)自小木蟲Android客戶端 |
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