In this experiment, chitosan (CS), waste limestone and diammonium hydrogen phosphate were used as raw materials to synthesize HAp-coated-stone composites/CS by one-step blending method. Then, the prepared HAp-coated-stone composites/CS composite material was used to remove Cu (II) in the solution. The structure and microstructure of the composite were characterized by Fourier transform infrared spectroscopy, X-ray diffraction analysis, Scanning Electron Microscopy, Brunauer–Emmett–Teller and Thermogravimetric Analysis. The results showed that with the addition of CS, the overall thermal stability of the composite improved, while its specific surface area decreased. Moreover, the composite was a mesoporous material. HAp-coated-stone/CS composites with small amounts of CS (0.5%) can remarkably increase Cu (II) removal. The HAp-coated-limestone/CS-0.5% had better resistance to pH changes compared with HAp-coated-limestone. Under the initial concentration of 20 mg/L, the maximum adsorption capacity for Cu (II) adsorption by HAp-coated-limestone/CS-0.5% was about 130.75 mg/g at 40 °C. The equilibrium data and kinetic were well described by Freundlich models and pseudo-second-order, respectively. The possible mechanisms for Cu (II) adsorption onto HAp-coated-stone/CS composites surface have been proposed.

本实验以壳聚糖（CS），废石灰石和磷酸氢二铵为原料，通过一步掺混法合成了HAp涂层石复合材料/ CS。然后，使用制备的HAp涂层石材复合材料/ CS复合材料去除溶液中的Cu（II）。通过傅立叶变换红外光谱，X射线衍射分析，扫描电子显微镜，Brunauer-Emmett-Teller和热重分析对复合材料的结构和微观结构进行了表征。结果表明，添加CS可以提高复合材料的整体热稳定性，同时降低其比表面积。此外，复合材料是介孔材料。少量CS（0.5％）的HAp涂层石材/ CS复合材料可以显着提高Cu（II）的去除率。HAp涂层石灰石/ CS-0。与HAp涂层石灰石相比，5％的抗pH值变化更好。在20 mg / L的初始浓度下，HAp涂层石灰石/CS-0.5%对Cu（II）的最大吸附容量在40°C时约为130.75 mg / g。平衡数据和动力学分别由Freundlich模型和伪二阶很好地描述。有人提出了将铜（II）吸附到HAp涂层石/ CS复合材料表面的可能机理。