纳米二氧化钛光催化氧化降解苯酚废水实验

Experimental Study on Photocatalytic Degradation of Phenol Wastewater by Nano-Titania

开展实验室模拟苯酚废水的二氧化钛光催化氧化实验。结果表明:在苯酚废水曝气量为0~3 L/min的条件下,随着曝气量的增大,COD去除率先增大后减小;初始浓度不变,光照时间为1 h的条件下,调节pH值在3~11,苯酚废水COD去除率随着pH值的增大而减小,当pH值为11时,COD去除率又开始增大,酸性条件比碱性条件下COD去除率高;随着二氧化钛投加量的增加,COD去除率增大,当二氧化钛投加量为10 g/L时,COD去除率反而降低,二氧化钛最佳投加量为3 g/L;随着苯酚废水初始浓度由75 mg/L增加至300 mg/L,COD去除率由78.2%降低到58.1%;反应温度的改变对COD和TOC的去除率没有影响。

A photocatalytic oxidation experiment of titanium dioxide was carried out to simulate the degradation of phenol wastewater.Accoding to experimental results,the removal of COD first increased and then decreased with the increase of the aeration amount of phenol wastewater at 0-3 L/min;when the initial concentration remained unchanged and the light time was 1 h,and the pH value was adjusted from 3 to 11,the COD removal rate of phenol wastewater decreased with the increase of pH value;when the pH value was 11,the COD removal rate increased again,and the COD removal rate was higher under acidic conditions than under alkaline condition;with the increase of TiO2 concentration,the COD removal rate increased;when the TiO2 concentration was 10 g/L,the COD removal rate decreased on the contrary,and the optimal TiO2 concentration was 3 g/L;as the initial concentration of phenol wastewater increased from 75 mg/L to 300 mg/L,the COD removal rate decreased from 78.2%to 58.1%;the removal rate of COD and TOC was not affected by the change of reaction temperature.