Valorization of manganese residue to construct amorphous MnO2/α-Fe2O3@geopolymer Z-scheme heterojunction for efficient Cr(VI) reduction and ciprofloxacin degradation

Xiunan Cai, Qingling Liu, Qing Yang, Fuzheng Fu, Yanjuan Zhang, Tao Gan, Huayu Hu, Zuqiang Huang