氧化石墨烯/Fe3O4纳米材料对柠檬酸废水处理效果的研究

Study on the Treatment of Citric Acid Wastewater with Graphene Oxide/Fe3O4 Nanomaterial

为了研究氧化石墨烯/四氧化三铁(Fe3O4)纳米材料对低浓度柠檬酸废水的处理效果.本研究将实验分为4组,包括空白组、氧化石墨烯组、Fe3O4组和氧化石墨烯/Fe3O4组,利用不同材料分别处理实验模拟柠檬酸废水,分析重铬酸盐耗氧量(CODCr)去除率动态曲线、耗氧量、比耗氧速率和污泥指数等指标,比较其对废水的处理效果.与其他组相比,氧化石墨烯/Fe3O4组在最短的时间(4 h)达到降解平衡,一级反应动力学曲线的降解速率常数最高(0.2383 h^-1),且得到了最高的CODCr去除率(86.78%);该组的耗氧量和比耗氧速率最大,分别为2.80 mg/L和15.87 mg/(L·h·g);污泥性能检测结果表明该组污泥的沉降性能、污泥活性、疏水性能和絮凝性能的改善程度均优于其他组.

In order to study the effect of graphene oxide/Fe3O4 nanomaterial on the treatment of low concentration citric acid wastewater.In this study,the experiment was divided into four groups,including blank group,graphene oxide group,Fe3O4 group and graphene oxide/Fe3O4 nanomaterial group.Different materials were used to treat the experimental simulation of citric acid wastewater,and the treatment effect of wastewater was compared by analyzing the dynamic curve of removal rate of dichromate oxygen consumed(CODCr),oxygen consumption,specific oxygen consumption rate and sludge index.Compared with other groups,the graphene oxide/Fe3O4 nanomaterial group reached the degradation equilibrium in the shortest time(4 h),the degradation rate constant of the first-order reaction kinetics curve was the highest(0.2383 h^-1),and the CODCr removal rate was the highest(86.78%).The oxygen consumption and specific oxygen uptake rate of the graphene oxide/Fe3O4 nanomaterial group was the highest,2.80 mg/L and 15.87 mg/(L·h·g)respectively.The results of sludge performance test showed that the improvement degree of settling performance,sludge activity,hydrophobic and flocculation performance of the graphene oxide/Fe3O4 nanomaterial group was better than that of other groups.