Adsorption of As(V) inside the pores of porous hematite in water

Journal of Hazardous Materials
Min DaiAlejandro Lopez-Valdivieso

Abstract

As(V) adsorption inside the pores of porous hematite in water has been studied in this work. This study was performed on nonporous hematite and porous hematite prepared from the thermal decomposition of goethite and siderite through the measurements of adsorption isotherm, SEM-EDX, XRD and BET. The results demonstrated that the As(V) adsorption was difficult to be realized inside pores if they were too small. This observation might be due to that the pore entrances were blocked by the adsorbed ions and thus the inside surfaces became invalid for the adsorption. Only if the pore size is large enough, the effective surface area inside pores would be close to that on non-porous hematite for As(V) adsorption. In addition, it was found that siderite is better than goethite for preparing porous hematite with thermal decomposition as adsorbent for arsenic removal.

References

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Citations

May 15, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jianrui NiuZaixing Li
Mar 4, 2019·Environmental Science and Pollution Research International·Shifeng LiWenxiu Li
Aug 13, 2021·The Science of the Total Environment·Yu LiangWenfeng Tan

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