Preparation of carbon adsorbents from lignosulfonate by phosphoric acid activation for the adsorption of metal ions
Preparation of carbon adsorbents from lignosulfonate by phosphoric acid activation for the adsorption of metal ions
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DOI：
10.1016/j.carbon.2014.09.032
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发表时间：
2014-12-01
期刊：
影响因子：
10.9
通讯作者：
Puziy, A. M.
中科院分区：
文献类型：
--
作者：
Myglovets, M.;Poddubnaya, O. I.;Puziy, A. M.
以木质素磺酸钠为原料，在400~1000℃的碳化温度下，用磷酸活化法制备了活性碳，并对其比表面积、孔体积、孔径分布、表面基团分布和吸附铜离子的能力进行了表征。采用氮气吸附、扫描电子显微镜、傅里叶变换红外光谱和热重分析等手段对活性碳进行了表征。结果表明，随着炭化温度的升高，比表面积由400℃时的770m(2)/g降至700℃时的180m(2)/g，再升高至1000℃时的1370m(2)/g。发现其表面基团的总浓度高达3.3 mmol/g。即使在pH值低至2的情况下，这些碳也显示出对铜离子的高吸附能力。(C)2014 Elsevier Ltd.保留所有权利。
Activated carbons were prepared from sodium lignosulfonate by phosphoric acid activation at carbonization temperatures of 400-1000 degrees C. The resulting materials were characterized with regard to their surface area, pore volume, pore size distribution, distribution of surface groups and ability to adsorb copper ions. Activated carbons were characterized by nitrogen adsorption, scanning electron microscopy, Fourier transform infrared spectroscopy and thermal gravimetric analyses. The results indicate that with increasing carbonization temperature, the surface area decreased from 770 m(2)/g at 400 degrees C to 180 m(2)/g at 700 degrees C and increased at higher temperatures to 1370 m(2)/g at 1000 degrees C. The phosphorus content peaked at 11% for carbon obtained by carbonization at 800 degrees C. Potentiometric titration revealed the acidic character of all the phosphoric acid-activated carbons, which were found to have total concentrations of surface groups of up to 3.3 mmol/g. The carbons showed a high adsorption capacity for copper ions even at pH values as low as 2. (C) 2014 Elsevier Ltd. All rights reserved.