以水热法结合溶剂热法制备了NH₂-MIL-101(Fe)/BiVO₄异质结光催化剂。在紫外光照射下,以硝酸盐脱除率R(NO^-₃)和氮气选择性S(N₂)为评价指标,考察了催化剂组成、空穴捕获剂种类、空穴捕获剂添加量和杂质阴离子种类等因素对NH₂-MIL-101(Fe)/BiVO₄异质结光催化剂硝酸盐脱除性能的影响。结果表明,向BiVO₄中添加NH₂-MIL-101(Fe)制备得到的异质结光催化剂在紫外光照射下可以高效地将硝酸盐污染物还原为无毒无害的氮气,硝酸盐脱除率可以达到93.9%,氮气选择性可以达到90.16%;0.06-MBiVO光催化剂化学性质稳定、可重复利用性良好。

NH₂-MIL-101(Fe)/BiVO₄ heterojunction photocatalyst is prepared through hydrothermal method combined with solvothermal method.The effects of catalyst composition,the type and concentration of hole scavenger,and the types of anion impurities on nitrates removal performance of NH₂-MIL-101(Fe)/BiVO₄ under UV irradiation are investigated by using the removal rate of nitrates and the selectivity of nitrogen as evaluation indexes.Experimental results show that the heterojunction photocatalyst prepared by adding NH₂-MIL-101(Fe) into BiVO₄ can efficiently reduce nitrates into non-toxic and harmless N₂ under UV irradiation.The removal rate of nitrates can reach 93.9% and the selectivity of nitrogen is as high as 90.16% in 90 min.The 0.06-MBiVO photocatalyst has stable chemical properties and great reusability,presenting high industrial application potential.

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