Optimization and mechanistic insight of phenol removal using an effective green kaolin adsorbent through experimental and computational approaches by Zubir, Aisyah, Erna Normaya, Erna Normaya, Zuhaidi, Nurul Huda, Goh, Pei Sean, Mat Piah, Mohd. Bijarimi, Ismail, Mohamad Wafiuddin, Show, Pau Loke, Ismail, Ahmad Fauzi, Ahmad, Mohammad Norazmi