【摘要】 采用悬浮聚合、水蒸气活化方法制备了树脂基球状活性炭（ACS）,并进行硝酸氧化改性（NACS）,用于焦油加氢后油品的脱色研究。通过SEM、N₂吸附-脱附、FTIR、XPS、TG等技术对所制样品ACS和NACS进行结构性质表征。结果显示,经硝酸氧化改性后,NACS样品的表面形貌和孔结构并未受到显著影响,但球状活性炭表面的含氧官能团明显增加。选取两种典型的显色化合物对苯醌（PBQ）和N,N-二仲丁基对苯二胺（DBD）配置一定浓度的模型油进行吸附脱色,考察了吸附时间、吸附温度和吸附剂用量对吸附剂性能的影响。研究表明,NACS样品展现出良好的吸附性能,在一定的吸附条件下,对DBD和PBQ的脱色率分别达到94.5%和96.6%,除了球状活性炭表面微孔提供的活性位点之外,NACS表面官能团与有色物质形成的氢键可能对吸附性能的提升起着关键作用。重复使用6次后,吸附剂对两者的脱色率仍能达到90%以上,展现出良好的可再生性能。在对真实加氢油品脱色后,脱色效果显著,验证了所制备吸附剂在实际应用中的可行性。更多还原

【Abstract】 Resin-based activated carbon spheres（ACSs） were prepared by a combined suspension polymerization, carbonization and activation method. The ACSs were then oxidized with nitric acid（NACSs） to modify the surface properties to increase the decolorization of hydrogenated coal tar. The morphology, pore structure, elemental composition and pyrolysis kinetics of the polymer sample were characterized by SEM, N₂ adsorption, FTIR, XPS and TGA. Results showed that this oxidation modification of the ACSs has little influence on their surface morphology and pore structure while the numbers of surface oxygen functional groups were remarkably increased. P-benzoquinone（DBD） and N,N-di-sec-butyl-1,4-phenylenediamine（PBQ） were selected as model color compounds for decolorization tests with ACSs and NACSs. The effects of adsorption time, temperature and amount of adsorbent on the decolorization performance were investigated. Under the same adsorption conditions, the amounts of decolorization of DBD and PBQ were 94.5% and 96.6%, respectively for NACSs while those for ACSs were much lower, indicating the outstanding adsorption performance of NACSs. Hydrogen bonds formed between surface functional groups and colored compounds may play a key role in improving the adsorption performance. Moreover, the decolorization of NACSs was still more than 90% after NACSs were recycled 6 times. The decolorization effect of NACSs for real hydrogenated coal tar was also significant and its color faded after adsorption by NACSs, confirming their feasibility for practical use.更多还原