Abstract
The development of efficient and practical adsorbent on eliminating hexavalent chromium (Cr(VI)) is a valuable and challenging target. In this work, various layered double hydroxide (LDH) and its calcined products (layered double oxide, LDO) were used as the adsorbent to optimize the efficiency and performance on removing Cr(VI) (from Cr2O72−) in water. NiAl-LDH, CoAl-LDH, NiFe-LDH and CaFe-LDH, as well as their calcined materials were prepared and characterized by various techniques. The magnetic-composite adsorbent was carried out by mechanical grinding NiAl-LDO and CaFe-LDH with the benefit of easy solid-liquid separation. The as-prepared adsorbents exhibited the differences in the structural phase, surface characteristic, and magnetic and optical properties. The saturation magnetization and magnetic interaction of NiAl-LDO to the external magnet were generated (5.4 emu/g) by mixing with CaFe-LDH (22.8 emu/g). The maximum adsorption capacity was decreased in the order of NiAl-LDO > CoAl-LDO > CaFe-LDH@NiAl-LDO > NiAl-LDH > CaFe-LDH > NiFe-LDO > calcined CaFe-LDH > NiFe-LDH > CoAl-LDO. This work revealed an alternative inorganic adsorbent with efficient and/or practical functionalities for cleaning the wastewater contaminated with Cr(VI) in anionic species.
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