Green Synthesis Nanokomposit ZnO/ZnV2O6 menggunakan Ekstrak Daun Jambu Biji (Psidium guajava L.) dalam Sistem Dua Fasa dan Uji Aktivitas Fotokatalitiknya terhadap Degradasi Tetracycline = Green Synthesis of ZnO/ZnV2O6 Nanocomposites Using Guava (Psidium guajava L.) Leaf Extract in a Two-Phase System and Testing its Photocatalytic Activity on Tetracycline Degradation