Hierarchical porous biochars with controlled pore structures derived from co-pyrolysis of potassium/calcium carbonate with cotton straw for efficient sorption of diethyl phthalate from aqueous solution

Hu Cheng, Jiapeng Zhang, Yueyi Chen, Wenrui Zhang, Rongting Ji, Yang Song, Wei Li, Yongrong Bian, Xin Jiang, Jianming Xue, Jiangang Han