Batch adsorption study of Congo Red dye using unmodified Azadirachta indica leaves: isotherms and kinetics oleh Tariq Javed, Anusha Thumma, Abdullah Nur Uddin, Rubbai Akhter, Muhammad Babar Taj, Shagufta Zafar, Mirza Mahmood Baig, Syed Shoaib Ahmad Shah, Muhammad Wasim, Muhammad Amin Abid, Tariq Masood, Muhammad Idrees Jilani, Maryam Batool