碳泡沫阴极电-Fenton深度处理造纸废水研究

Carbon Foam Cathode Electro-Fenton Process for Papermaking Wastewater Advanced Treatment

关键词:  造纸废水  深度处理  电-Fenton  碳泡沫  COD_Cr去除率

Key Words:papermaking wastewater  advanced treatment  electro-Fenton  carbon foam  COD_Cr removal rate

摘要:本研究通过蔗糖发泡-碳化工艺制备了碳泡沫阴极材料并应用于电-Fenton深度处理造纸废水。采用扫描电子显微镜（SEM）、X射线光电子能谱仪（XPS）对碳泡沫阴极表面形貌和化学结构进行表征。以COD_Cr去除率为评价指标，考察了阴极材料、反应时间、初始pH值、Fe²⁺投加量和电流密度对造纸废水深度处理效果的影响。结果表明，碳泡沫由大量孔洞结构堆叠而成，表面存在含氧官能团。反应时间180 min、pH值3、Fe²⁺投加量0.5 mmol/L、电流密度200 mA/cm²时，以碳泡沫为阴极的电-Fenton深度处理造纸废水的COD_Cr去除率最高，达到88.4%，相比常规碳毡阴极提高了1.3倍。以碳泡沫为阴极的电-Fenton深度处理造纸废水法具有良好的稳定性，10次循环的COD_Cr去除率均超过85%，效率降低率不超过5%。

Abstract:In this study， a carbon foam cathode material was prepared by sucrose foaming-carbonization process for electro-Fenton advanced treatment of papermaking wastewater. Electron scanning microscope （SEM） and X-ray photoelectron spectrometer （XPS） were used to characterize the surface morphology and chemical construction of carbon foam cathode. The influence of the type of cathode material， reaction time， initial pH value，Fe²⁺ dosage and current density on the treatment efficiency of papermaking wastewater was investigated with COD_Cr removal rate as the evaluation index. The results indicated that carbon foam was formed by stacking a large number of pore structures with oxygen-containing functional groups on the surface. The optimum reaction conditions of electro-Fenton method with carbon cathode was that reaction time was 180 min， initial pH value was 3，Fe²⁺ dosage was 0.5 mmol/L and current density was 200 mA/cm². The COD_Cr removal rate could reach 88.4% under the conditions， which was 1.3 times higher than conventional carbon felt cathode. The COD_Cr removal rate remained 85% for 10 circles with less than 5% reduction in efficiency， indicating that the electro-Fenton method with carbon foam had good stability in the advanced treatment of papermaking wastewater.