Zhao Rui, Guo Yuchen, Huang Xiaoqiao, Qian Jun, Wu Yulong, Li Zhen, Lu Shuxiang
College of Chemical Engineering and Materials Science, Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization, Tianjin University of Science and Technology, Tianjin 300457, China.
PetroChina Fuel Oil Company Limited Research Institute, Beijing 100195, China.
J Hazard Mater. 2022 Feb 15;424(Pt A):127290. doi: 10.1016/j.jhazmat.2021.127290. Epub 2021 Sep 25.
The disposal of the Cr containing tannery sludge has become a serious environmental problem in China, which has attracted increasing attention. However, experimental and theoretical research is still needed. We developed a feasible route to synergistic immobilization the Cr in tannery sludge into the spinel-based phases by addition of ZnO and TiO. ZnO and Cr can form stable spinel-based phase, and TiO can suppress the formation of Cr. The significantly synergistic effect between ZnO and TiO promoted the immobilization of Cr in tannery sludge and reduce the leaching of the chromium in the annealed sludge. The oxidation of Cr to Cr in the presence of alkaline substances has been elucidated by density functional theory, and it is revealed that the electrons from the Cr-d orbit jump to the Ca-d and directly transform into the O.
含铬制革污泥的处置已成为中国一个严重的环境问题，受到越来越多的关注。然而，仍需要进行实验和理论研究。我们开发了一条可行的途径，通过添加ZnO和TiO将制革污泥中的铬协同固定到尖晶石基相中。ZnO和Cr可以形成稳定的尖晶石基相，而TiO可以抑制Cr的形成。ZnO和TiO之间显著的协同效应促进了制革污泥中Cr的固定，并减少了退火污泥中铬的浸出。通过密度泛函理论阐明了在碱性物质存在下Cr氧化为Cr的过程，结果表明来自Cr-d轨道的电子跃迁到Ca-d并直接转化为O。
