Modification of lead dioxide electrode and electrocatalytic degradation of anthracene in coking wastewater
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摘要: 为了研究电催化对焦化废水中污染物的降解效果，采用电沉积法制备了Ti/PbO2、Ti/PANI/PbO2和Ti/PANI/PbO2-Ce三种电极，对电极进行扫描电镜和X射线衍射表征、电化学性能测试、产羟基自由基(·OH)能力测试和加速寿命测试。结果表明，经聚苯胺(PANI)和铈(Ce)改性的Ti/PANI/PbO2-Ce电极具有更好的表面形貌和更高的催化活性，能产生更多的·OH，析氧电位为1.83 V，加速寿命时间为720 min。采用Ti/PANI/PbO2-Ce电极降解焦化废水中的蒽，考察了主要因素对降解效果的影响，得到蒽的最佳降解条件为电压14 V，板间距1.0 cm，电解质浓度0.35 mol/L，反应时间120 min，pH值10。Ti/PANI/PbO2-Ce电极显示了良好的电催化性能。Abstract: To investigate the electrocatalytic degradation effect of anthracene in coking wastewater, Ti/PbO2, Ti/PANI/PbO2 and Ti/PANI/PbO2-Ce electrodes were prepared by electrodeposition, and the electrodes were subjected to scanning electron microscopy and X-ray diffraction characterization, electrochemical performance test, hydroxyl radical (·OH) production capacity test and accelerated lifetime test.The results showed that the Ti/PANI/PbO2-Ce electrode modified with polyaniline (PANI) and cerium (Ce) had better surface morphology and higher catalytic activity, and could produce more ·OH with an oxygen precipitation potential of 1.83 V and an accelerated lifetime of 720 min.The Ti/PANI/PbO2-Ce electrode was used for the degradation of anthracene in coking wastewater, and the effects of the main factors on the degradation effect were investigated, and the optimal degradation conditions for anthracene were obtained as voltage 14 V, plate spacing of 1.0 cm, electrolyte concentration of 0.35 mol/L, reaction time of 120 min, pH value of 10.The Ti/PANI/PbO2-Ce electrode showed good electrocatalytic performance.
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Key words:
- electrocatalytic oxidation /
- polyaniline /
- cerium /
- hydroxyl radical /
- anthracene /
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图 6 二氧化铅电极·OH生成能力的荧光强度曲线
Figure 6. Fluorescence intensity curve of ·OH formation ability of lead dioxide electrode
图 9 Na2SO4电解质浓度对蒽降解的影响
Figure 9. Influence of Na2SO4 electrolyte concentration on anthracene degradation
图 12 初始浓度对蒽降解的影响
Figure 12. Influence of initial concentration on anthracene degradation
表 1 某焦化企业废水中多环芳烃浓度
Table 1. Concentration of polycyclic aromatic hydrocarbons in wastewater from a coking enterprises
多环芳烃 浓度/(μg·L-1) 蒽 93.65 萘 73.64 苯并[a]蒽 56.72 菲 43.89 苯并[a]芘 37.55 芘 31.86 茚并[g，h，i]芘 26.54 苯并[k]荧蒽 23.87 
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