石墨毡阴极电Fenton法降解水中亚甲基蓝试验研究

Experimental study on degradation of methylene blue in water by graphite felt cathodic electrofent on method

针对难降解染料废水,本文研究使用电Fenton法处理亚甲基蓝模拟废水,阴极采用石墨毡,阳极采用石墨棒,考察电解质阴离子种类、p H、电压对亚甲基蓝去除率的影响,对石墨毡阴极、石墨毡阳极(阴极石墨棒)、石墨毡双电极和石墨棒双电极电Fenton去除亚甲基蓝的效果进行比较,并且研究电Fenton体系中铁离子的循环再生效果。结果表明:电解质阴离子种类、p H和电压都会对亚甲基蓝的去除率产生显著影响;SO42-和NO3-作为外加电解质时去除率分别可达到97.58%、96.07%,CH3COO-和CI-作为外加电解质时去除率较低;亚甲基蓝去除率随p H和电压的增加都会出现先上升后下降的趋势,p H值为3.0,电压为7 V,电解30 min,亚甲基蓝去除率可达98.38%;石墨毡阴极、石墨毡双电极电Fenton对亚甲基蓝的去除效果良好,去除率分为98.65%和97.13%,石墨毡阳极、石墨棒双电极电Fenton的去除率仅有45.73%、15.59%;电Fenton体系中铁离子的循环再生效果随电压的增加逐渐变差,电压从5 V增加到11 V,总铁离子含量下降率从7.33%增加到32.67%,Fe2+再生率从84.33%降低到48.67%。

In order to remove refractory dye waste water pollution,this study investigated the degradation performance through the construct electro-Fenton system,which the graphite rod was used as anode and graphite felt was used as cathode,in the room artificial methylene blue wastewater.The main effective impact factors about the removing rate,such as the anion types,p H and the optimal voltage,were compared and analyzed in the designed experiments.The results showed that the removal rates of methylene blue in the different electrolytes can reach to 97.58%(SO42-) and 96.07%(NO3-),respectively.But the removal rates of CH3COO-and CI-were lower when they were used as electrolytes.With the increase of p H and voltage,the removal rate of methylene blue showed a trend of rising and then decreasing.Under the conditions of pH 3.0 and voltage 7 V for 30 min,the removal rate of methylene blue can reach 98.38%.The removal rates of methylene blue by graphite felt as cathode and graphite felt as double electrode system were 98.65% and 97.13%,respectively.However,the removal rates of graphite felt as anode and graphite rod as double electrode system were only 45.73% and 15.59%.The regeneration effect of iron ions in the electro-Fenton system gradually deteriorates with increasing voltage.When the voltage was increased from 5 to 11 V,the decline rate of total iron ion content increased from 7.33% to 32.67%,and the Fe2+regeneration rate decreased from 84.33% to 48.67%.Finally,this study may provide a theoretical basis for the understanding the degradation performance through the construct electro-Fenton system of refractory dye wastewater pollution remove.