铋酸钠催化大气压介质阻挡放电降解苯胺

Degradation of aniline by dielectric barrier discharge combined with sodium bismuthate

在柱-板式介质阻挡放电体系中投加铋酸钠催化剂,研究了该体系的放电光谱特性及对苯胺模拟废水的协同处理效果,考察了pH值、苯胺初始质量浓度及催化剂投加量等因素对降解率的影响,探讨了铋酸钠协同介质阻挡放电(DBD)催化降解苯胺的机理。实验结果表明,柱-板式电极结构放电过程中辐射出了紫外光和可见光,300~450nm之间出现高强度N2第二正带谱线。初始浓度100mg/L苯胺废水被处理10min后,投加0.2g/L催化剂时溶液的TOC去除率最高,比单独DBD低温等离子体体系提高14.11%。在碱性条件下,苯胺和TOC的去除率均好于酸性和中性条件。XRD检测结果显示铋酸钠在反应前后峰值位置未发生明显改变。

In order to make the best use of oxidants and UV irradiation in dielectric barrier discharge （DBD）, catalyst sodi- um bismuthate was added into a rod-plate DBD reactor. The spectral characteristics of DBD and the effects of pH value, aniline initial concentration, and catalyst dosage on aniline degradation rate were investigated. The synergistic catalytic mechanism of ani- line removal was discussed. The results show that the radiation of UV and visible light was produced in the discharge process, and the highest intensity spectral in the range of 300-450 nm is N2 second positive band line. The degradation efficiency of 100 mg/L aniline was improved after sodium bismuthate being added, and total organic carbon （TOC） removal was improved 14.11 with 0.2 g/L catalyst addition. Under alkaline condition, the degradation rates of aniline and TOC were better than that of acid and neutral conditions. The XRD test results showed that the peak position of the sodium aluminate before and after the reaction did not change significantly.