采用固相反应法结合水热合成法制备了一种新型g-C₃N₄/BiVO₄异质结光催化剂,用于舰船烟气脱硝废水中硝酸盐氮污染物的治理。结果表明,相比纯g-C₃N₄和BiVO₄,g-C₃N₄/BiVO₄异质结光催化剂具有更高的光催化性能;催化剂组成、空穴捕获剂种类、空穴捕获剂添加量等因素均对硝酸盐氮脱除效果具有显著影响;当硝酸盐氮初始质量浓度为50 mgN/L、空穴捕获剂HCOOH浓度为45 mmol/L时,经过120 min紫外光照射,0.30-CNBVO光催化剂还原硝酸盐氮效果最佳,其硝酸盐氮脱除率达到了91.62%,N₂选择性达到了86.39%。

A novel g-C₃N₄/BiVO₄ heterojunction catalyst is prepared via solid-state reaction method combined with hydrothermal synthesis method,and used to eliminate nitrates-based nitrogen pollutants in denitration wastewater from the treatment of ship smoke.The results show that compared with pure BiVO₄ or g-C₃N₄,g-C₃N₄/BiVO₄ heterojunction catalyst exhibits better photocatalytic performance.The composition of catalyst,the types of hole scavenger and the dosage of hole scavenger all have significant impact on the removal efficiency of nitrates-based nitrogen.The best reduction effect of nitrates-based nitrogen can be achieved with a removal rate of 91.62% and a nitrogen selectivity of 86.39% when the initial concentration of nitrates-based nitrogen is 50 mgN·L^-1,the addition of hole scavenger HCOOH is 45 mmol·L^-1,UV irradiates for 120 min,and 0.30-CNBVO catalyst is used.

刘霞(1990-),女,硕士,助教,主要从事微量检测分析及催化剂开发研究,liuxia900711@163.com