煤基中空板式炭膜的研制及其在含酚废水处理中的应用

Development of coal-based hollow-plate carbon membrane and itsapplication in phenolic wastewater treatment

电场强化煤基导电炭膜实现了电化学氧化与膜分离的一体化耦合,展现出优异的有机废水处理性能。以煤为原料制备了新型煤基中空板式炭膜(HPCM),采用扫描电子显微镜(SEM)、孔径分布仪、四探针分析仪、傅里叶红外光谱仪(FTIR)、X射线衍射仪(XRD)和拉曼光谱仪对炭膜的结构性能进行表征,采用电化学工作站分析了炭膜的电化学活性;并以典型难降解有机物苯酚为目标污染物,考察了HPCM在外加电场的作用下对模拟含酚废水的处理性能。研究表明,所制备炭膜具有发达的孔隙结构,平均孔径和孔隙率分别为0.71μm和47.73%;炭膜的炭结构以碳微晶结构为主,但整体无序度较高;炭膜具有良好的导电性能和电化学性能。在未施加电场的情况下,炭膜对废水中的苯酚分子没有明显的去除性能;外加电场作用下,HPCM对苯酚具有良好的电化学氧化作用,其对苯酚的主要氧化机理包括直接氧化和间接氧化;在最佳的操作条件:外加电压为2.5 V、苯酚质量浓度为100 mg/L、流速为5 mL/min,HPCM对苯酚的去除率达到了98%左右,对COD的去除率高达82.15%。这些结果表明所制备煤基中空板式炭膜在含酚废水处理领域展现了良好的应用前景。

The electric field-enhanced coal-based conductive carbon membrane which couples electrochemical oxidation and membrane separation simultaneously exhibits excellent organic wastewater treatment performance.In this work,a novel Hollow-Plate Carbon Membrane(HPCM)was prepared from low-cost coal.The structural performances of HPCM were characterized via SEM,pore size analyzer,four-probe analyzer,FTIR,XRD and Raman Spectrometer.The electrochemical performance of HPCM was evaluated by using an electrochemical workstation.The phenolic wastewater treatment performance of HPCM was also investigated by using typical refractory organic phenol as target pollutant under the enhancement of electrical filed.It is found that the HPCM possesses developed pore structures,and its mean pore width and porosity are 0.71μm and 47.73%,respectively.The carbon structure of HPCM is consisted mainly of the carbon microcrystallites with relatively low orderliness and it showes a high electrical conductivity and electrochemical activity.The HPCM has a very low removal rate for phenol molecules in wastewater without the assistance of electrical-field.HPCM showes good electrochemical oxidation on phenol under the application of electric filed,and its electrochemical oxidation mechanism includes both direct oxidation and indirect oxidation.The phenol removal rate and COD removal rate of HPCM reach to 98%and 82.15%,respectively,under the optimal operation condition of applied voltage of 2.5 V,phenol concentration of 100 mg/L and flow rate of 5 mL/min.These results show that the HPCM has a good application prospect on the phenolic wastewater treatment.