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首页> 外文期刊>Science of the total environment >Systematic changes of bone hydroxyapatite along a charring temperature gradient: An integrative study with dissolution behavior
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Systematic changes of bone hydroxyapatite along a charring temperature gradient: An integrative study with dissolution behavior

机译：沿炭化温度梯度骨羟基磷灰石的系统变化：溶解行为的一体化研究

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The applicability of bone char as a long-term phosphorus nutrient source was assessed by integrating their mineral transformation and physicochemical properties with their dissolution behavior. We have explored synchrotron-based spectroscopic and imaging techniques (FTIR, XRD, and TXM) to investigate the physicochemical changes of bone and bone char along a charring temperature gradient (300-1200 °C) and used a lab incubation experiment to study their dissolution behaviors in solutions of different pH (4, 6, and 6.9). The thermal decomposition of inorganic carbonate (CO_3~(2-)) and the loss of organic components rendered a crystallographic rearrangement (blueshift of the PO_4~(3-) peak) and mineral transformation with increasing temperatures.The mineral transformation from B-type to AB- and A-type carbonate substitution occurred mainly at ＜700 °C, while the transformation from carbonated hydroxyapatite (CHAp) to more mineralogically and chemically stable HAp occurred at ＞800 °C. The loss of inorganic carbonate and the increase of structural OH~- with increasing temperatures explained the change of pH buffering capacity and increase of pH and their dissolution behaviors. The higher peak area ratios of phosphate to carbonate and phosphate to amide I band with increasing temperatures corroborated the higher stability and resistivity to acidic dissolution by bone chars made at higher temperatures. Our findings suggest 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 high pH buffering capacity in acidic and near-neutral solutions. The 700 °C bone char was proposed as a suitable liming agent for raising the soil pH and abating soil acidity. Our study has underpinned the systematic changes of bone char and interlinked the charring effect with their dissolution behavior, providing a scientific base for understanding the applicability of different bone chars as suitable P-fertilizers.
机译：通过将它们的矿物转化和物理化学性能与其溶解行为集成，评估骨炭作为长期磷营养源的适用性。我们已经探索了基于同步的光谱和成像技术（FTIR，XRD和TXM）来探讨沿着炭疽温度梯度（300-1200°C）的骨骼和骨炭的物理化学变化，并使用实验室孵化实验来研究它们的溶解在不同pH（4,6和6.9）的解决方案中的行为。无机碳酸酯的热分解（CO_3〜（2-））和有机组分的损失使得结晶重排（PO_4〜（3-）峰的平坦峰值）和矿物转化，随着温度的增加。来自B型的矿物转化主要发生在700℃的碳酸盐酸盐替代物中，而碳酸羟基磷灰石（CHAP）转化为更近型矿物学和化学稳定的Hap，发生在> 800℃。无机碳酸盐损失和结构oh〜 - 随着温度的增加，解释了pH缓冲能力的变化和pH的增加及其溶解行为。磷酸盐与碳酸盐和磷酸盐较高的峰面积比随着温度的增加，通过在较高温度下制备的骨骼易腐蚀的酸性溶解率较高的稳定性和电阻率。我们的研究结果表明，通过废物管理和再循环，低至中间温度下的骨骼焦炭可以是土壤肥力的大量磷来源。在500℃下制造的骨炭表现出酸性和近中立溶液中的高pH缓冲能力。提出了700℃的骨炭作为适当的液化剂，用于提高土壤pH和减少土壤酸度。我们的研究已经巩固了骨折的系统变化，并通过溶解行为将炭化效应相互联系，为理解不同骨骼变性的适用性作为合适的P-肥料，提供了一个科学群。

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