Text this: Adsorption isotherm models and error analysis for single and binary adsorption of Cd(II) and Zn(II) using leonardite as adsorbent

  _  __   __   __   _    _      ___      _____   
 | |/ //  \ \\/ // | |  | ||   / _ \\   |__  //  
 | ' //    \ ` //  | |/\| ||  / //\ \\    / //   
 | . \\     | ||   |  /\  || |  ___  ||  / //__  
 |_|\_\\    |_||   |_// \_|| |_||  |_|| /_____|| 
 `-` --`    `-`'   `-`   `-` `-`   `-`  `-----`