Synthetic carbons activated with phosphoric acid -: I.: Surface chemistry and ion binding properties
Synthetic carbons activated with phosphoric acid -: I.: Surface chemistry and ion binding properties
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DOI：
10.1016/s0008-6223(01)00317-7
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发表时间：
2002-01-01
期刊：
影响因子：
10.9
通讯作者：
Tascón, JMD
中科院分区：
文献类型：
--
作者：
Puziy, AM;Poddubnaya, OI;Tascón, JMD
在400- 100 ℃范围内的不同温度下，通过磷酸活化苯乙烯-二乙烯基苯共聚物制备合成活性炭。通过元素分析、阳离子交换容量测定、红外光谱、质子亲合谱计算电位滴定和溶液中铜吸附等方法对所得炭进行了表征。结果表明，合成碳具有酸性，并显示出与氧化碳相似的阳离子交换性能，但磷酸处理产生的酸性化合物与碳晶格紧密结合，比氧化处理引入的酸性化合物具有更高的化学和热稳定性。800 ℃活化后引入最大量的阳离子交换表面基团。红外光谱研究表明，磷化合物可能是结合在碳晶格上的多磷酸盐。由电位滴定实验计算的质子亲合性分布曲线显示了合成磷酸活性炭上的四种类型的表面基团。其中含磷基团对酸性溶液中重金属离子（铜）的吸附最为重要。因此，磷酸活化炭可作为一种有前景的阳离子交换剂，用于去除水中的重金属。(C)2002爱思唯尔科技有限公司。保留所有权利。
Synthetic activated carbons were prepared by phosphoric acid activation of a styrene-divinylbenzene copolymer at various temperatures in the 400-100degreesC range. The resulting carbons were characterized by elemental analysis, cation-exchange capacity measurement, infrared spectroscopy, potentiometric titration with calculation of proton affinity spectra, and copper adsorption from solution. The results indicate that the synthetic carbons obtained possess acidic character and show cation-exchange properties similar to those of oxidized carbons, However, the acidic Compounds arising from treatment with phosphoric acid are tightly bound to the carbon lattice and are chemically and thermally more stable than those introduced by oxidative treatments. The largest amount of cation-exchange Surface groups is introduced after activation at 800 degreesC. Infrared investigations showed that phosphorus compounds may be polyphosphates bound to the carbon lattice. Proton affinity distribution curves calculated from potentiometric titration experiments showed four types of surface groups on synthetic phosphoric acid activated carbons. Among them phosphorus-containing groups are the most important for the adsorption of heavy metal ions (copper) from acid solutions. Thus, carbons activated with phosphoric acid may be regarded as prospective cation-exchangers for the removal of heavy metals from water solutions. (C) 2002 Elsevier Science Ltd. All rights reserved.