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Abstract We employed Ti-bearing blast furnace slag (Ti-BFS) as raw material to prepare calcined TiO2-loaded layered double hydroxides (TiO2-CLDHs) through acidolysis-alkali precipitation coupled with pyrolysis strategy. During the pyrolysis process,… Click to show full abstract
Abstract We employed Ti-bearing blast furnace slag (Ti-BFS) as raw material to prepare calcined TiO2-loaded layered double hydroxides (TiO2-CLDHs) through acidolysis-alkali precipitation coupled with pyrolysis strategy. During the pyrolysis process, the involvement of TiO2 and LDHs made the TiO2-CLDHs composites have superior photocatalytic ability and abundant porosities, resulting in highly-efficient removal of arsenic (As) from groundwater. Meanwhile, OH played crucial role in the As(III) oxidation process through the results of Electron-spin resonance spectroscopy (ESR) and X-ray photoelectron spectroscopy (XPS) measurements. In addition, the co-existing of humic acid in groundwater was found to compete for OH and adsorption sites of TiO2-CLDHs, leading to a decrease in As removal. This study not only provided a novel strategy for Ti-BFS disposal, but also evaluated the application of TiO2-CLDHs in the treatment of As contaminants in groundwater environment.
Journal Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Year Published: 2020
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