生物炭光催化氧化-吸附协同降解亚硝酸盐  

Synergistic biochar photocatalytic oxidation-adsorption for nitrite degradation

作　　者：毛华恺 余洋 张悦 夏广坤 吴赟韬 楼乐瑶 牛文娟 刘念 MAO Huakai;YU Yang;ZHANG Yue;XIA Guangkun;WU Yuntao;LOU Leyao;NIU Wenjuan;LIU Nian(College of Engineering,Huazhong Agricultural University,Wuhan 430070,Hubei,China;Key Laboratory of Aquaculture Facilities Engineering,Ministry of Agriculture and Rural Affairs,Wuhan 430070,Hubei,China;Agricultural Equipment Laboratory of the Middle and Lower Reaches of the Yangtze River,Ministry of Agriculture and Rural Affairs,Wuhan 430070,Hubei,China)

机构地区：[1]华中农业大学工学院,湖北武汉430070 [2]农业农村部水产养殖设施工程重点实验室,湖北武汉430070 [3]农业农村部长江中下游农业装备重点实验室,湖北武汉430070

出　　处：《化工进展》2024年第8期4757-4765,共9页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(32201685);湖北省创新创业训练项目(S202310504186)。

摘　　要：通过正交实验研究生物炭-光-氧共同作用下不同环境亚硝酸盐净化规律,结合多重对照实验,解析光照、曝气、添加生物炭对亚硝酸盐降解的影响差异,揭示亚硝态氮迁移路径与降解机制。结果表明,亚硝酸盐净化效果主要受环境酸碱度和温度影响,其中酸碱度为主控因素。当亚硝酸盐浓度1.8mg/L、生物炭添加量0.4g、温度25℃、反应时间60min、pH=2时,净化率最高可达98.25%。多数情况下,曝气能够显著提升亚硝酸盐净化率,较之未曝气处理最高提升9.7倍。光照则更适合用于强酸、强碱环境中亚硝酸盐的去除,较之无光照条件净化率最高提升5.7倍。而单纯添加生物炭对亚硝酸盐降解助力效果有限,需配合光照和曝气共同作用。三种条件共存,产生生物炭光催化氧化-吸附协同作用,促使亚硝态氮经由氧化、光催化、吸附等路径降解、迁移,获得良好净化效果。The pattern of nitrite removal in different environments under the combined effect of biochar-light-oxygen was studied by orthogonal tests.Combining with multiple contrast tests,the differences in the effects of light,aeration and biochar addition on nitrite removal were analyzed,and the nitroso-nitrogen migration pathways and degradation mechanisms were revealed.The results showed that removal efficiencies of nitrite were mainly influenced by environmental pH and temperature.The pH was the main controlling factor.The highest removal rate was 98.25%at 1.8mg/L nitrite concentration,0.4g biochar addition,25℃,60min reaction time,and pH=2.Aeration normally facilitated the removal of nitrite.The removal rate could be increased at a maximum of 9.7 times compared to non-aerated treatment.Likewise,light promoted the removal of nitrite in strong acidic and alkaline environments,increasing the removal rate at most 5.7 times without light conditions.The addition of biochar brought a weak boost to nitrite removal and needs to be combined with light and aeration to achieve a better removal effect.The coexistence of the three conditions produced a synergistic effect of biochar photocatalytic oxidation-adsorption,which promoted the degradation and migration of nitrite nitrogen through oxidation,photocatalysis and adsorption to obtain a good removal effect.

关 键 词：光催化 氧化 吸附 生物炭 亚硝酸盐 曝气 

分 类 号：S214[农业科学—农业机械化工程]