RETRACTED: Comparative study of ozonation and ozonation catalyzed by Fe-loaded biochar as catalyst to remove methylene blue from aqueous solution

Muhammad Babar, Hafiz Muhammad Shahzad Munir, Aamna Nawaz, Naveed Ramzan, Umair Azhar, Muhammad Sagir, Muhammad Suleman Tahir, Amir Ikhlaq, Siti Nuurul Huda Mohammad Azmin, Muhammad Mubashir, Kuan Shiong Khoo, Kit Wayne Chew