应用制备的活性炭(AC)负载活性组分催化剂催化臭氧处理丁香酚模拟废水,通过扫描电镜、X-射线衍射仪和比表面积分析仪对制备的催化剂特性进行表征,考察了AC负载活性组分种类和负载量、催化剂加入量及初始pH对催化臭氧氧化降解丁香酚模拟废水过程中CODCr去除效果的影响,并对降解过程中CODCr的去除反应动力学进行研究。结果表明:活性炭表面成功负载了活性组分Fe2O3、CuO、CeO2、NiO,制备的催化剂具有明显的催化活性,显著提高了臭氧氧化降解丁香酚模拟废水过程中CODCr的去除效果,催化活性从大到小依次为Fe/AC>Ce/AC>Cu/AC>Ni/AC;制备的Fe/AC 具有最高的催化活性,在pH为11、负载量3%、Fe/AC加入量0.3 g/L条件下,反应60 min后CODCr去除率达到88.90%,分别比AC催化臭氧处理和单独臭氧处理提高21.13%和29.95%;制备的催化剂稳定性良好,在重复回收利用6次后,依然保持较好的催化效果。动力学分析表明,臭氧氧化、AC、Fe/AC、Ce/AC、Cu/AC、Ni/AC催化臭氧氧化处理丁香酚模拟废水过程中CODCr的降解符合表观二级动力学规律,活性炭负载的活性组分有效提高了反应的动力学速率。
The catalytic ozonation of eugenol simulated wastewater in the presence of activated carbon load different active components were investigated under different operating conditions. The prepared catalysts were characterized by scanning electron microscopy, X-ray diffractometry and specific surface area analyzer.The effects of active components, loading content,catalyst dosage and initial pH on CODcr removal from eugenol simulated wastewater by catalytic ozonation were evaluated. And kinetics model of the CODcr degradation were explored.Characterization of catalyst indicated that the iron,copper,cerium and nickel loaded on activated carbon were mainly in the form of ferric oxide,copper oxide, ceria,nickel oxide,respectively,which have obvious catalytic activity and remarkably improves the removal efficiency of CODcr in the process of ozonation degradation of eugenol simulated wastewater.The order of catalytic activity is Fe / AC> Ce / AC> Cu / AC> Ni / AC.The presence of ferric oxide on activated carbon positively contributed to its catalytic activity in ozonation of eugenol . Initial pH of 11,iron loading content of 3% and catalyst dosage of 0.3g/L achieved highest eugenol removal of 88.90% among all the tried conditions in 60min as compared with AC catalytic oxidation and ozone alone, the eugenol removal were further improved by 21.13% and 29.95%, respectively. The repeated use six times of the catalyst proved that the Fe/AC catalyst had a good reusability and stability.Finally,apparent second-order kinetics model of the CODcr degradation in the eugenol simulated wastewater with ozone alone,AC,Fe/AC,Ce/AC,Cu/AC and Ni/AC oxidation were established,which indicated that activated carbon-loaded active components effectively increase the kinetic rate of the reaction.