0428同步年報-2021-全

074 ACTIVITY REPORT 2021 the increase of structural OH - with increasing temperature explained the change of pH buffering capacity and increase of pH and their dissolution behaviors. In summary, the larger ratios of peak area of phosphate to carbonate and phosphate to amide-I band with increasing temperatures corroborated the greater stability and resistivity to acidic dissolution by bone chars made at higher temperatures. Our findings indicate that bone char made at low to intermediate temperatures can be a substantial source of phosphorus for soil fertility via waste management and recycling. The bone char made at 500 °C exhibited a large pH buffering capacity in acidic and nearly neutral solutions. The bone char at 700 °C was proposed as a suitable liming agent to raise the soil pH and to abate soil acidity. (Reported by Biqing Liang, National Cheng Kung University) This report features the work of Biqing Liang and her collaborators published in Sci. Total Environ. 766 , 142601 (2021). TPS 09A Temporally Coherent X-ray Diffraction TLS 14A1 IR Microscopy TLS 01B1 X-ray Microscopy • Micro-FTIR Spectroscopy, Powder Diffraction, 2D X-ray Imaging • Environmental and Earth Sciences, Materials Science, Chemistry Reference 1. P. P. Biswas, B. Liang, G. Turner- Walker, J. Rathod, Y.-C. Lee, C.-C. Wang, C.-K. Chang, Sci. Total Envi- ron. 766 , 142601 (2021). Fig. 2 : Semi-quantitative micro-FTIR ( TLS 14A1 ) spectral analyses on fitting the peak area and comparing the ratio for bone chars made at 400−700 °C. (a) The increasing A- to B-type v 2 CO 3 2- ratio of area of signals. (b) Decreasing FWHM of structural OH - , and increasing ( v 1 + v 3 ) PO 4 3- to ( v 3 ) CO 3 2- ratio of signal area. (c) Upshifting of the centroid position and decreasing FWHM of the v 3c PO 4 3- signal. (d) Diminishing ratio of amide-I to ( v 1 + v 3 ) PO 4 3- signal area as an index of organic component (collagen and protein) to PO 4 3- ratio. The pH increased significantly in bone chars formed at higher temperatures. [Reproduced from Ref. 1] Fig. 3 : XRD ( TPS 09A ) patterns of bone and bone chars at vaious temperatures. The major mineral phase was CHAp (ICDD-01-089-6448); the major d -spacings were 2.721, 2.781 and 2.816 Å. The mineral phase transformed to HAp (ICDD-01-084-1998) above 800 °C, whereas the major d -spacings were 2.718, 2.779 and 2.814 Å. [Reproduced from Ref. 1]