Fayçal DERGAL, Hanane MAHROUG, Ali MANSRI

In situ preparation of hydroxyapatite composites into hydrolyzed polyacrylamide solution and methylene blue dye retention

Four composites of hydroxyapatite/hydrolyzed polyacrylamide (HAP/HPAM-n) were prepared using an insitu wet chemical method. The synthesis was performed by preparing a suspension of calcium in a copolymer solutionhaving a known HPAM concentration. Phosphoric acid was added dropwise to each suspension to obtain HAP/HPAM-ncomposites. The effect of initial copolymer amount on the composite properties was investigated using XRD, FTIR,TGA, and SEM/EDS analysis. The obtained results were compared to the HAP sample synthesized under the sameconditions and without copolymer. HPAM amount in the composite affects the retention of methylene blue (MB) dye.The result shows that the increase of HPAM in the material leads to the increase of the dye retention capacity. Therefore,the composite prepared with a higher copolymer amount was selected to study the effects of different parameters onthe dye removal including contact time, concentration, pH, temperature, and composite regenerations. We deduce inthis work that the composite HAP/HPAM-75 is a good candidate for MB dye retention from aqueous solution with amaximum removal capacity of 435.6 mg g −1and the possibility of its reuse for several times.

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