Abstract A silver phosphate/hydroxyapatite (Ag3PO4/HA) composite was produced from phosphate waste rocks, firstly by the valorization of these wastes to HA and then by the treatment of this prepared HA with a silver nitrate solution. A type of response surface methodology, Box–Behnken experimental design, was used to find optimum synthesis parameters (silver to HA weight ratios, calcination temperature and calcination time). The visible light photodegradation of Rhodamine B in aqueous solution was used as the experimental response. The analysis of variance for the results showed that silver weight ratio is the most influential parameter on photoactivity of the synthesized photocatalyst. The optimum conditions were predicted to give an RhB degradation yield of 98.609%/4 hours under visible light conditions. In this context, a Ag/HA weight ratio of 14%, a calcination temperature of 300 °C, and a calcination time of 30 min were found to be the optimum conditions. Samples synthesized under the optimum condition were characterized by the use of X-ray diffraction, X-ray fluorescence spectrometer, Fourier transform infrared spectrum analysis, scanning electron microscopy, transmission electron microscopy and ultraviolet-visible diffuse reflection spectroscopy. By comparison with pure HA, the characterization results clearly showed the successful synthesis of the Ag3PO4/HA composite.

中文翻译：

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可见光照射下磷酸盐废石转化为 Ag3PO4/羟基磷灰石光催化降解罗丹明 B

摘要以磷酸盐废石为原料，首先将这些废物增值为HA，然后用硝酸银溶液处理所制备的HA，生产磷酸银/羟基磷灰石（Ag3PO4/HA）复合材料。采用响应面方法（Box-Behnken 实验设计）来寻找最佳合成参数（银与 HA 的重量比、煅烧温度和煅烧时间）。以罗丹明 B 在水溶液中的可见光光降解作为实验响应。结果方差分析表明银重量比是对合成光催化剂光活性影响最大的参数。预计最佳条件在可见光条件下 RhB 降解率为 98.609%/4 小时。在此背景下，发现 Ag/HA 重量比为 14%、煅烧温度为 300 °C、煅烧时间为 30 分钟是最佳条件。利用X射线衍射仪、X射线荧光光谱仪、傅里叶变换红外光谱分析、扫描电子显微镜、透射电子显微镜和紫外-可见漫反射光谱仪对最佳条件下合成的样品进行了表征。通过与纯HA的比较，表征结果清楚地表明Ag3PO4/HA复合材料的成功合成。