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papawa

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wandaohzl:¹ÄÀø½»Á÷ 2010-11-18 19:43:42
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papawa

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wandaohzl:¹ÄÀø½»Á÷ 2010-11-18 19:44:03
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feifei2890

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wandaohzl:¹ÄÀø½»Á÷ 2010-11-18 19:44:15
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papawa

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wandaohzl:¹ÄÀø½»Á÷ 2010-11-18 19:44:31
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feifei2890

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papawa(½ð±Ò+2): 2010-11-19 22:58:26
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Originally posted by papawa at 2010-11-18 19:28:09:

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Õâ¸öÒ»°ãµÄ»îÐÔÌ¿µÄÎÄÏ×ÉÏÃæ¶¼ÓУ¬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.ÎÒËæ±ãÕÒµÄÒ»¸öÎÄÏס¶Kinetics and thermodynamics of adsorption of ionizable aromatic compounds from aqueous solutions by as-prepared and oxidized multiwalled carbon nanotubes¡·ÉÏÃæµÄ²½Öè¡£
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tiancanna

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ÎÄÏ×Chemical oxidation of multiwalled carbon nanotubes¡£CARBON 46 (2008) 833 ¨C 840
3.4. Titration analysis
A direct acid¨Cbase 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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dreamfield

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