Fourier transform infrared spectroscopy (FTIR, JASCO FT/IR- 4600, JASCO International Co. Ltd., Tokyo, Japan) was applied to investigate functional groups on the surface of the apatite and biochar (CB400, CB600) [36 (link),37 (link)]. The field emission electron microscope (FE-SEM, JSM-6700F, JEOL, Akishima Tokyo, Japan) equipped with an energy dispersive spectrometer (EDS) was used to analyze the surface morphology and chemical composition of the amendments [91 (link),92 (link)]. The surface area and dimensional pore of the materials were investigated using a BET analyzer (TriStar II 3020, Micromeritics Instrument Corporation, 4356 Communications Dr, Norcross, GA 30093, United States) [91 (link),93 (link)].
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