In this research, Sr-doped hydroxyapatite, HAp and NiO nanoparticles were used to produce a novel nanocomposite, Sr-doped HAp/NiO. Various analytical and instrumentation techniques such as FTIR, PXRD, UV-DRS, SEM, TEM, and XPS were used to characterize the as synthesized composite material. The nanocomposite acts as an efficient photocatalyst and is able to degrade Congo red (CR) dye up to 95.6% within 40 min under solar light irradiation without any kind of external additive. The HR LC–MS spectrum was recorded to determine the degradation products of the chosen organic dye. Furthermore, the as prepared nanocatalyst also effectively reduced 98.7% of carcinogenic Cr(VI) to Cr(III) within just 10 min. In order to propose the photocatalytic mechanism and to detect the active radicals present, a radical trapping experiment was conducted. As an appealing photocatalyst for wastewater treatment and reduction of toxic chemicals, the research concluded with a methodical and cost-effective process for producing the Sr-doped HAp/NiO nanocomposite.

中文翻译：

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羟基磷灰石基复合材料的开发：Sr掺杂HAp/NiO被证明是一种有效的纳米催化剂，可用于有机染料的光催化降解和Cr(VI)的光还原


在这项研究中，Sr 掺杂羟基磷灰石、HAp 和 NiO 纳米粒子被用来生产一种新型纳米复合材料，Sr 掺杂 HAp/NiO。使用各种分析和仪器技术（例如 FTIR、PXRD、UV-DRS、SEM、TEM 和 XPS）来表征合成的复合材料。该纳米复合材料作为一种高效的光催化剂，无需任何外部添加剂，在太阳光照射下40分钟内即可将刚果红（CR）染料降解高达95.6%。记录 HR LC-MS 谱以确定所选有机染料的降解产物。此外，所制备的纳米催化剂还在短短10分钟内有效地将98.7%的致癌Cr(VI)还原为Cr(III)。为了提出光催化机理并检测存在的活性自由基，进行了自由基捕获实验。作为一种用于废水处理和减少有毒化学品的有吸引力的光催化剂，该研究得出了一种生产 Sr 掺杂 HAp/NiO 纳米复合材料的有条理且经济高效的工艺。