FCF-LDH/BiVO_(4)with synergistic effect of physical enrichment and chemical adsorption for efficient reduction of nitrate  

作　　者：Yajie Bai Zhenyuan Fang Yong Lei Lijing Liu Huaiquan Zhao Hongye Bai Weiqiang Fan Weidong Shi 

机构地区：[1]School of Chemistry and Chemical Engineering,Jiangsu University,Zhenjiang,212013,China [2]Institute of Physics&IMN MacroNano,Technische Universitat Ilmenau,Ilmenau,98693,Germany [3]School of Chemistry,Beihang University,Beijing,100191,China

出　　处：《Green Energy & Environment》2024年第7期1112-1121,共10页绿色能源与环境（英文版）

基　　金：National Natural Science Foundation of China(22075112);Jiangsu Province and Education Ministry Co-Sponsored Synergistic Innovation Center of Modern Agricultural Equipment(XTCX2027);Jiangsu Province Innovation Support Program International Science and Technology Cooperation Project(BZ2022045)。

摘　　要：Photoelectrochemical NO_(3)^(-)reduction(PEC NITRR)not only provides a promising solution for promoting the global nitrogen cycle,but also converts NO_(3)^(-)to the important chemicals(NH_(3)).However,it is still a great challenge to prepare catalysts with excellent NO_(3)^(-)adsorption/activation capacity to achieve high NITRR.Herein,we designed a novel Fe^(2+)~Cu^(2+)Fe^(3+)LDH/BiVO_(4)(FCF-LDH/BVO)catalyst with synergistic effect of chemical adsorption and physical enrichment.Fe^(2+)in FCF-LDH/BVO provides the rich Lewis acid sites for the adsorption of NO_(3)^(-),and the appropriate layer spacing of FCF-LDH further promotes the physical enrichment of NO_(3)^(-)in its interior,thus realizing the effective contact between NO_(3)^(-)and active sites(Fe^(2+)).FCF-LDH/BVO showed excellent NH_(3)production performance(FE_(NH_(3))=66.1%,r_(NH_(3))=13.8μg h^(-1)cm^(-2))and selectivity(FE_(NO_(2)^(-))=2.5%,r_(NO_(2)^(-))=4.9μg h^(-1)cm^(-2))in 0.5 mol L^(-1)Na_(2)SO_(4)electrolyte.In addition,FCF-LDH/BVO maintains the desirable PEC stability for six cycle experiments,showing great potential for practical application.The^(14)NO_(3)^(-)and^(15)NO_(3)^(-)isotope test provides strong evidence for further verification of the origin of N in the generated NH_(3).This LDH catalyst has a great potential in PEC removal of NO_(3)^(-)from groundwater.

关 键 词：LDH Lewis acid sites Physical enrichment Photoelectrochemical NO_(3)^(-)Reduction Ammonia 

分 类 号：X703[环境科学与工程—环境工程]