硼掺杂金刚石厚膜电极对高浓度工业废水的降解实验研究

目的 探索BDD厚膜电极处理高浓度有机废水方案的可行性.方法 利用直流电弧等离子体喷射法制备BDD厚膜电极,对其结构和电化学性能进行表征,并利用BDD厚膜作为电解阳极对高浓度模拟废水(葡萄糖溶液)和实际工业过程产生的橡胶助剂废水进行电化学氧化处理.结果 对电极样品的表征表明,其在0.5 mol/L H2SO4溶液中的电化学窗口和析氧电位分别为3.02 V和2.07 V.对模拟废水(葡萄糖溶液)和橡胶助剂工业废水的电化学降解实验表明,BDD厚膜电极对废水中的有机物有很好的去除效果.对于初始COD(化学需氧量)值为18940 mg/L的高浓度葡萄糖溶液,在电解8 h后,COD值的去除率为91.02％.对于初始COD值为18380 mg/L的高浓度橡胶助剂废水,在电解10 h后,COD值的去除率为97.42％.结论 直流电弧等离子体喷射法制备的重掺杂BDD厚膜电极有着较宽的电化学窗口和高的析氧电位,能有效地降低有机溶液的COD值.BDD厚膜电极的最佳工作条件为:在高有机物浓度环境下,为提高降解效率,应选择较高的电流密度.对于高COD值葡萄糖溶液和橡胶助剂废水,最优电流密度为200 mA.在低有机物浓度环境下,为降低能耗,应该选择较低的电流密度.对于低COD值葡萄糖溶液,最优电流密度为50 mA.

Experimental Study on Degradation of High Concentration Organic Wastewater Using Thick Boron Doped Diamond Film Electrodes

This paper aims to explore the feasibility of BDD thick film electrode in the treatment of high concentration organic wastewater. The method used in this paper is to prepare BDD thick film electrodes using DC arc plasma injection process, characterize their structure and electrochemical properties, and use the BDD thick film as an electrolytic anode for electrochemical oxidation of high concentration simulated wastewater (glucose solution) and rubber auxiliary wastewater generated from actual industrial processes. Characterization of the electrodes revealed that the electrochemical window and oxygen evolution potential of the electrodes in a 0.5 mol/L H2SO4 solution were 3.02 V and 2.07 V, respectively. Experiments on the degradation of glucose solution (as simulative wastewater) and wastewater containing organic additives collected from rubber industry showed that the electrode has good removal ability for organic materials of the wastewaters. For a high- concentration glucose solution with an initial COD (chemical oxygen demand) value as high as 18 940 mg/L, 8-hour treatment decreased its COD value by 91.02%, while for high-concentration organic wastewater collected from rubber industry with an initial COD value of 18 380 mg/L, 10-hour treatment decreased the COD value of the wastewater by as high as 97.42%. It comes to the conclusion that the heavily doped BDD thick film electrode prepared by DC arc plasma jet method has wide electrochemical window and high oxygen evolution potential, which can effectively reduce the COD value of organic solution. The best working condition of BDD thick film electrode is:under the condition of high organic matter concentration, a higher current density should be selected to improve the degradation efficiency. For the high COD glucose solution and rubber additive wastewater in this experiment, the optimal current density is 200 mA. Under the condition of low organic matter concentration, in order to reduce energy consumption, a lower current density should be selected. For the low COD glucose solution in this experiment, the optimal current density is 50 mA.