In order to biomimetic synthesize hydroxyapatite similar to natural bone. Hydroxyapatite (HAP) is biomimetic synthesized in\nsimulated body fluid (SBF) by addition of imidazole-4,5-dicarboxylic acid grafted chitosan (IDACS). The effect of molar ratio of\nchitosan (CS) to imidazole-4,5-dicarboxylic acid (IDA) on preparation of HAP was investigated. The structure, size, and crystal\nphase of the obtained hydroxyapatite were observed by Fourier transform infrared spectroscopy, X-ray powder diffraction, and\nscanning electron microscopy. The results show that the molar ratio of CS to IDA is 1 : 3, the temperature is ... the aging time\nis 48 h, the synthesized nanorod-like hydroxyapatite with diameter 20â??30 nm, and length ranging from 75 to 120nm presents\nexcellent phase, which disperses well and is similar to the natural bone of HAP. The obtained HAP can be used to remove\nchromium(VI) by the orthogonal experiments, and the results indicated that the removal rate can reach 95.66% under the\noptimum conditions. These results suggest that the morphology of the obtained HAP is more affected by the material ratio of\nchitosan to imidazole-4,5-dicarboxylic acid than its structure, and the obtained HAP can effectively remove Cr(VI), which\nprovides a novel method for biomimetic synthesis of other biomaterials and application in the water purification.
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