Role of reduced sulfur in the transformation of cd(II) immobilized by δ-MnO2 - Sun, Qian; Cui, Peixin; Wu, Song; Liu, Cun; Fan, Tingting; Alves, Marcelo Eduardo; Cheng, Hu; Huang, Meiying; Zhou, Dongmei; Wang, Yujun (Environmental Science & Technology, 2020)