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对煤质活性炭、椰壳活性炭和沥青基活性炭进行了硝酸氧化处理。通过酸碱滴定、红外光谱、比表面积和孔径分布测定研究了硝酸氧化对3种活性炭的表面官能团、比表面积和孔结构的影响,以及硝酸氧化对活性炭进一步进行乙二胺胺化的影响。结果表明,在所选的3种活性炭中,氧化对于椰壳活性炭的物理结构破坏最严重,比表面积下降了16%,而煤质活性炭与沥青基活性炭均很好地保持了原有的结构性质。硝酸氧化在不同的活性炭表面均引入了一定量的酸性基团,其中沥青基活性炭氧化后表面酸性基团含量最高,达到2.36mmol/g。氧化后的3种活性炭接枝乙二胺后,沥青基活性炭的表面碱性基团含量最高,达到1.39mmol/g。
On the quality of activated carbon, coconut shell activated carbon and bitumen-based activated carbon nitric acid oxidation treatment. The effects of nitric acid oxidation on the surface functional groups, specific surface area and pore structure of the three activated carbons were studied by acid-base titration, infrared spectroscopy, specific surface area and pore size distribution, and the effect of nitric acid oxidation on the further ethylenediamine amination. The results showed that among the three selected activated carbons, the physical structure of the coconut shell activated carbon was the most severely damaged, and the specific surface area decreased by 16%. However, both the coal-based activated carbon and the bitumen-based activated carbon maintained their original structural properties . Nitric acid oxidation introduced a certain amount of acidic groups on the surface of different activated carbons, of which the content of acid groups on the surface of activated carbons was the highest, reaching 2.36mmol / g. After the oxidized three activated carbon grafted ethylenediamine, the content of basic basic groups on the surface of asphalt-based activated carbon is the highest, reaching 1.39mmol / g.