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采用经过臭氧、空气和混酸(HNO3-H2SO4)化学改性的多壁碳纳米管(MWNTs)作为催化剂,用扫描电子显微镜(SEM)、FT-IR、Raman、XPS分析方法对MWNTs进行结构表征。在间歇式高压反应釜中,以改性后的MWNTs作为催化剂,开展了催化湿式氧化苯酚的活性研究。结果表明:经改性的MWNTs具有较高的催化活性。在155℃和总压2.5 MPa,苯酚初始浓度为1 000 mg/L,催化剂投加量为0.4 g/L的条件下,液相臭氧改性方法处理的MWNTs表现出了良好的催化活性,反应120 min后苯酚的去除率为100%,溶液的矿化率为72%。改性的催化剂表面生成的含氧官能团是MWNTs在催化湿式氧化反应中具有高活性的重要原因。
MWNTs were characterized by scanning electron microscopy (SEM), FT-IR, Raman and XPS analysis using multiwalled carbon nanotubes (MWNTs) chemically modified by ozone, air and mixed acid (HNO3-H2SO4) In the batch autoclave, with the modified MWNTs as a catalyst, a catalytic wet oxidation of phenol was carried out. The results show that the modified MWNTs have high catalytic activity. Under the conditions of 155 ℃ and total pressure of 2.5 MPa, the initial concentration of phenol was 1 000 mg / L and the dosage of catalyst was 0.4 g / L, the MWNTs treated by liquid phase ozone modification exhibited good catalytic activity. The reaction After 120 min, the removal rate of phenol was 100%, and the mineralization rate of the solution was 72%. The oxygen-containing functional groups formed on the modified catalyst surface are the important reasons for the high activity of MWNTs in the catalytic wet oxidation.