Journal of Metals, Materials and Minerals

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CoAl−layered double oxide derived from calcination of CoAl−layered double hydroxide at400Cfor 120 min, delivered the change in microstructure with increasing surface area. Spinel Co3O4was the majority in the product as confirmed by X-ray diffraction, and Fourier transform infrared andUV-visible spectroscopies. The calcined product, CoAl−layered double oxide resulted in significantadsorption capacity on dye removal superior to that of CoAl−layered double hydroxide. The adsorbed amounts of the diverse dyes increased as follows: methylene blue phenolphthaleinmethyl orange orange II. The adsorption affinity between adsorbent and dyes relied on electrostatic interaction and physical adsorption.

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