【摘要】 通过HNO₃、H₂O₂、NaOH对活性炭进行浸渍改性,采用BET、SEM、Boehm、FT-IR对改性前后的活性炭进行表征,研究了改性前后的活性炭在不同反应体系对DMP的降解效果和动力学,探讨了微波诱导改性前后的活性炭催化降解DMP的机理。结果表明,3种改性活性炭的BET比表面积、总孔容、微孔孔容和平均孔径均有所增加。HNO₃、H₂O₂改性后表面酸性基团增加、碱性基团减少,而NaOH改性呈现相反的理化特征变化。活性炭理化特征的变化可能与化学改性剂溶液的酸碱性、氧化还原性有关。微波诱导改性前后的活性炭催化体系对DMP的降解率大于单独吸附或单纯微波辐射体系,且均符合一级反应动力学。在微波诱导改性前后的活性炭催化体系中,改性前后的活性炭通过表面吸附-微波诱导氧化协同作用极大地提高了对DMP的降解率。更多还原

【Abstract】 The activated carbon was modified by HNO₃, H₂O₂ and NaOH immersion, respectively. The original and modified activated carbons were characterized by using BET, SEM, Boehm and FT-IR. The degradation effects and kinetics of dimethyl phthalate（DMP） by the original and modified activated carbons in different reaction systems were studied. The DMP degradation mechanism by microwave-induced catalytic oxidation with modified activated carbon was also discussed. The results showed that BET surface area, total pore volume,micropore volume and average pore diameter of all the modified activated carbons increased. For HNO₃ and H₂O₂ modified activated carbon, its surface acidic functional groups increased, while its surface alkaline functional groups decreased. For NaOH modified activated carbon, an opposite change occurred on its physicochemical properties. Such changes might be associated with the acidity/alkaline and oxidizability/reducibility of chemical modifier solutions. The DMP degradation rates of the microwave-induced catalytic oxidation system with the original or modified activated carbon were higher than that of adsorption alone or microwave irradiation alone, and their degradation processes all followed the first-order reaction kinetics. The reaction mechanism showed that the DMP degradation rates could be greatly improved by the synergistic effect of surface adsorption and microwave-induced oxidation.更多还原