ZnO/CuSe composite-mediated bandgap modulation for enhanced photocatalytic performance against methyl blue dye oleh Khalida Mubeen, Kashif Safeen, Afshan Irshad, Akif Safeen, Tayyaba Ghani, Wiqar H. Shah, Rajwali Khan, Khawaja Shafique Ahmad, Ryan Casin, Mohamed A. Rashwan, Hosam O. Elansary, Attaullah Shah