Preparation of Dodecylsulfate Modified CoAl-Layered Double Hydroxide and Dye Removal
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Abstract
In this work, the modification of CoAl-LDH adsorbent was investigated by the intercalation of a series of dodecylsulfate (DS-) ions. The reaction between an aqueous suspension of CoAl-LDH and an aqueous solution of sodium dodecylsulfate was conducted under hydrothermal method at 120 °C for 1 day. The adding amount of DS- was adjusted to be 5, 10, 20 and 30 times to anion exchange capacity (AEC) of the LDH. The as-prepared inorganic adsorbents were characterized by powder X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The XRD patterns revealed that the interlayer space of CoAl-LDH was slightly expanded with increasing the loading amount of DS- until 30 times of the AEC. This result confirmed the presence of DS- molecules in the interlayer space with paraffin monolayer arrangement. The property of the adsorbents was assessed by the removal of rhodamine 6G, orange II and alizarin from solution. CoAl-LDH modified with dodecylsulfate (30 times of AEC) adsorbed three species of dye molecules from solution more than the other adsorbents, and exhibited the highest efficiency for removal of orange II.
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