In　this　paper,　an　advanced　photocatalyst,　B-TiO2/MgAl-CLDH,　was　synthesized　and　applied　in　cement　mortar.　The　photocatalytic　NOx　degradation　ability　of　cement　mortar　containing　B-TiO2/MgAl-CLDH　under　different　initial　NOx　concentrations　and　flow　rates　was　investigated.　The　results　show　that　B-TiO2/MgAl-CLDH　has　stronger　visible　light　absorption,　lower　recombination　rate　of　electron-hole　pairs　and　narrower　optical　band　gap　than　commercial　nano-TiO2　(P25),　resulting　in　enhanced　NOx　removal　efficiency.　Specifically,　the　maximum　NOx　degradation　ratio　of　B-TiO2/MgAl-CLDH　is　23.4%　within　30　min,　which　is　about　5　times　that　of　P25.　For　photocatalytic　mortar,　the　initial　NOx　concentration　(from　1.0　ppm　to　2.0　ppm)　and　flow　rate　(from　1　L/min　to　3　L/　min)　were　positively　correlated　with　NOx　removal　amount,　while　negatively　correlated　with　NOx　removal　ratio.　Based　on　the　internal　molecular　diffusion　properties　of　NOx,　Langmuir-Hinshelwood　and　the　power　law　kinetic　models　were　used　to　predict　the　NOx　degradation　ability　of　photocatalytic　mortar.　The　modeling　of　NOx　degradation　process　presents　a　reliable　prediction　of　the　NOx　removal　ability　of　photocatalytic　mortar,　serving　as　a　valuable　tool　for　assessing　the　mortar＇s　NOx　removal　effectiveness　for　policymakers　and　engineers.