Text this: The characterization of a novel magnetic biochar derived from sulfate-reducing sludge and its application for aqueous Cr(Ⅵ) removal through synergistic effects of adsorption and chemical reduction

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