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

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Text this: Simultaneous adsorption of copper ions and humic acid onto an activated carbon