气相沿面放电—活性炭纤维吸附联合降解双酚A废水研究

利用气相沿面放电—活性炭纤维(ACF)吸附(简称放电—吸附)联合处理含双酚A(BPA)废水,探讨了联合处理对BPA的降解效果,并通过处理过程中O3利用率变化以及处理前后ACF的表观状态变化分析了反应的作用机制。结果表明,放电—吸附联合处理相比单独放电和单独ACF吸附能显著提高BPA的降解率;在一定范围内,加大放电电压能提高放电—吸附联合处理的BPA降解效果,但放电电压超过一定值后,放电产生的O3量进一步增多,对ACF表面的结构破坏作用增加,反而导致BPA的降解效果降低,本研究较佳的放电电压为8.5kV;扫描电镜分析结果表明,经放电—吸附联合处理后,ACF表面出现大量的孔道,提高了表面的BPA富集浓度,同时也增加反应的活性位点;傅里叶变换红外光谱分析结果表明,联合处理后ACF表面的C—O、C=C、O—H等官能团都有所减少,可能是联合处理过程中O3等活性物质与ACF表面的这些还原性官能团发生了反应,诱导O3分解出了更多的自由基,从而促进了BPA的降解。

Investigation on the degradation of bisphenol A by gas-surface discharge combined with ACF adsorption

The gas-surface discharge combined with activated carbon fiber(ACF) adsorption was employed to treat bisphenol A(BPA) containing wastewater.The performance of this combination process for BPA degradation was discussed and the reaction mechanism was researched by analyzing the ozone utilization rate and microscopic structure of ACF.Results showed that the BAP degradation rate of this combination process was much higher than that of single surface discharge and single ACF adsorption process;increasing the voltage of combination treatment in a certain degree would enhance BAP degradation,while when the voltage was over 8.5 kV,increasing the voltage would inverse inhibit the BAP degradation for more ozone produced in discharge could destructed the surface structure of ACF,so the optimal discharge voltage was 8.5 kV.The SEM spectra of ACF showed that lots of pores were produced after combination process,which increased the BPA concentration and active sites on surface of ACF.FTIR spectra showed that C-O,C=C,O-H on ACF surface was decreased after combination treatment,it might be some active materials such as O3 reacted with these reducing functional groups during the treatment process,and the produced radical would further facilitate the degradation of BPA.