高压脉冲放电低温等离子体法降解废水中4-氯酚

Pulsed High voltage Discharge Plasma for Degradation of 4 Chlorophenol in Aqueous Solutions

考察了多种因素对高压脉冲放电低温等离子体法降解废水中 4-氯酚的影响。对降解过程所得的中间产物和终产物进行了分析。结果表明 ,提高脉冲电压峰值、延长放电时间、无机盐Fe SO4的存在均可提高降解效果 ,自由基清除剂及缓冲剂的存在会显著降低降解效果。对 1 0 0 mg/ L4-氯酚废水放电处理 2 4 0 min,最高降解率可达 90 %以上 ,降解产物主要有苯酚、对苯二酚、邻苯二酚、对氯邻苯二酚和对苯醌等。当放电时间足够长时 ,4-氯酚可完全降解为 CO2 和 H2

Effects of some factors were studied on the degradation of 4 chlorophenol in wastewater by pulsed high voltage discharge plasma. Furthermore, the intermediate products of the degradation were identified . The degradation efficiency of 4 chlorophenol could be raised considerably by increasing the peak voltage, prolonging the discharge time and adding FeSO 4 to the wastewater solution. The addition of radical scavenger and buffer could decrease the degradation efficiency of 4 chlorophenol. The maximum degradation efficiency of 100 mg/L 4 chlorophenol was over 90% after discharging for 240 minutes. The main intermediate products were phenol, hydroquinone, catechol, 1,4 benzoquinone and 4 chlorocatechol. The 4 chlorophenol can be mineralized to CO 2 and H 2O by enough time discharge.