Bauxite residues are a mass of industrial wastes derived from aluminum metallurgy. This work provided a simple pyrolysis method to magnetize the bauxite residue to serve as a magnetic adsorbent towards heavy metals removal. The X-ray diffraction patterns and Mossbauer spectrum results confirmed the partial reduction of iron species with an obvious enhancement in magnetization. The magnetized bauxite residue exhibited excellent removal efficiencies for Cu2+, Cd2+ and Pb2+ with maximum adsorption capacities of 219.0 mg g?1, 275.4 mg g?1, and 100.4 mg g?1, which could be quickly separated through a magnet. The adsorption equilibrium data were fitted to the Langmuir isotherm model, while the adsorption kinetics followed a pseudo-first-order model. According to the characterization results, chemical precipitation and sorption was the major mechanism for the removal of Cu2+, Pb2+, and Cd2+. Thus, the magnetized bauxite residue exhibited promising applications for heavy metals removal in wastewater.
Bulletin of Environmental Contamination and Toxicology - We investigated the occurrence of Cd, Cr, Cu, Ni, Pb and Zn in 28 road dust samples collected across China from June to August, 2020. The... 相似文献
To investigate the effect of histaminergic neuron on morphine - induced conditioned place preference ( CPP), the model of CPP was used to assess the rewarding effect of morphine. Morphine (2, 5, 10 mg/kg) significantly produced a CPP in a dose-dependent manner. In addition, morphine simultaneously and markedly lessened the histaminergic neurons in the TM, 相似文献