The aim of this paper is to evaluate the efficiency of the natural hydroxyapatite powder for anionic dye (Congo red) elimination from water and optimization of adsorption process parameters that are contact time (0‐360 min), solution pH (4‐9), initial dye concentration (400‐2400 mg/l), and adsorbent dosage (0.4‐20 g/l). Natural hydroxyapatite with high surface area was prepared from animal agriculture waste dromedary bone. X‐ray diffraction, transmission electron microscopy, transform infrared spectroscopy, and elemental analysis characterizations of the powder prepared show a hexagonal structure, the irregular form of hydroxyapatite and presence of other elements as trace element. The results of adsorption tests demonstrated the high efficiency of natural hydroxyapatite for removal of Congo red from water solution whose maximum experimental capacity adsorption of Congo red by natural hydroxyapatite is 900 mg/g at pH 4.5, equilibrium time 240 min and adsorbent dosage 2 g/l. According to the correlation coefficient value, the pseudo‐second order kinetic model identified the sorption mechanism of pollutant used on natural hydroxyapatite. The Freundlich isotherm is the best representative theoretical model of the dye molecules’ adsorption on the natural hydroxyapatite support.

中文翻译：

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从单峰骨头中提取羟基磷灰石的新应用：从水溶液中吸附去除刚果红

本文的目的是评估天然羟基磷灰石粉末从水中消除阴离子染料（刚果红）的效率，并优化吸附过程参数，包括接触时间（0-360分钟），溶液的pH值（4-9），初始染料浓度（400-2400 mg / l）和吸附剂剂量（0.4-20 g / l）。用动物农业废单峰驼骨制备了高比表面积的天然羟基磷灰石。所制备粉末的X射线衍射，透射电子显微镜，变换红外光谱和元素分析表征显示出六方结构，羟基磷灰石的不规则形式以及其他痕量元素的存在。吸附测试结果表明，天然羟基磷灰石对水溶液中刚果红的去除效率高，在pH 4.5的条件下，天然羟基磷灰石对刚果红的最大吸附容量为900 mg / g，平衡时间为240 min，吸附剂量为2 g / g。 l。根据相关系数值，伪二级动力学模型确定了天然羟基磷灰石上污染物的吸附机理。Freundlich等温线是染料分子在天然羟基磷灰石载体上吸附的最有代表性的理论模型。拟二级动力学模型确定了天然羟基磷灰石上污染物的吸附机理。Freundlich等温线是染料分子在天然羟基磷灰石载体上吸附的最有代表性的理论模型。拟二级动力学模型确定了天然羟基磷灰石上污染物的吸附机理。Freundlich等温线是染料分子在天然羟基磷灰石载体上吸附的最有代表性的理论模型。