软锰矿粒子电极的制备及其对SMP的催化降解

Preparation of pyrolusite particle electrode and its catalytic degradation of SMP

针对二氧化锰对废水中氯离子电解生成活性氯具有较好催化活性的特点,以软锰矿为原料制备一种新型粒子电极,将其用于三维电极系统处理油气田高含氯废水,利用活性氯的强氧化性进一步强化废水中难降解有机物SMP的处理;并考察软锰矿粒子电极制备条件对电极性能和电解效果的影响。结果表明:软锰矿与石墨质量比6∶4、PTFE分散液加入量10%、330°C下灼烧2 h为软锰矿粒子电极最优制备条件;与常规活性炭粒子电极相比,软锰矿粒子电极电解活性氯的产生量、COD去除率均显著优于活性炭粒子电极;且软锰矿粒子电极在重复使用多次后,活性组分流失量较小,对SMP的降解效率仍较高,保持了稳定的电催化性能。

The electrolysis of chloride ions in wastewater by manganese dioxide can produce active chlorine with a good catalytic activity.Thus,a new type of particle electrode was prepared with pyrolusite,which was used in a three-dimensional electrode system to treat high-chlorine wastewater in oil and gas fields.Then the active chlorine with strong oxidation ability was produced to strengthen the treatment of refractory organic matter SMP in wastewater.The effects of preparation conditions of pyrolusite particle electrode on electrode properties and electrolysis performance were investigated.The particle electrode was characterized by specific surface area analyzer and X-ray diffraction.The results show that the optimal preparation conditions of pyrolusite electrode were determined as follows:mass ratio of pyrolusite to graphite of 6∶4,PTFE dispersion dosage of 10%,and 2 h sintering at 330℃.Compared with the conventional activated carbon particle electrode,the production of activated chlorine and COD removal rate of the pyrolusite particle electrode were significantly higher.Moreover,after several recycling of the pyrolusite particle electrode,its active component loss was low,the recycled pyrolusite particle electrode still showed high SMP degradation efficiency and maintained a stable electro-catalysis performance accordingly.