Hydrogen adsorption and desorption characteristics of heat-treated calcium carbonate derived from Akoya-Pearl-Oyster nacre
Hydrogen adsorption and desorption characteristics of heat-treated calcium carbonate derived from Akoya-Pearl-Oyster nacre
复制标题
DOI：
10.1016/j.jece.2020.103983
复制
发表时间：
2020-08-01
影响因子：
7.7
通讯作者：
Saitoh, Hidetoshi
中科院分区：
文献类型：
--
作者：
Li, Heng;Komatsu, Keiji;Saitoh, Hidetoshi
通过环保的方法寻找 Akoya-Pearl-Oyster 废物处理问题的再利用解决方案一直非常重要。为此，选择 Akoya-Pearl-Oyster 珍珠粉（由约 95% 或更多文石组成）作为吸附剂，其被认为是用于器官移植或口服的潜在氢药物递送。通过改变温度、时间和压力合成了一系列珍珠粉。然后采用 X 射线衍射 (XRD)、场发射扫描电子显微镜 (FE-SEM) 和紫外可见光谱 (UV-VIS) 来表征形态和成分。热处理后珍珠层之间的有机基体被去除，留下裂纹状间隙，并在450℃持续10min（400℃持续5h）发生相变，并伴有横截面上间隙的扩展。通过氮吸附等温线研究孔隙率和表面积，这表明每个样品的无孔隙率。随着温度的升高，氢的释放量首先减少，发生相变，然后增加。结果表明，亲水性的形态和组成（包括有机基质和晶相）对水合阶段吸附的氢和水之间的置换有显着影响，从而促进氢的释放能力。此外，在 12 MPa 压力下加载后，在 500 摄氏度时可实现 21.1 x 10(3) ppm 的最大释放量。
Finding a reuse solution for the Akoya-Pearl-Oyster waste disposal issue through an environmentally friendly method has always been of great importance. To this aim, the Akoya-Pearl-Oyster nacre powder (consisted of about 95% or more of aragonite) was selected as adsorbents, which considered as a potential hydrogen drug delivery for organ transplantation or oral-taken. A series of nacre powder was synthesized via changing temperature, time, and pressure. X-ray diffractometry (XRD), Field emission scanning electron microscopy (FE-SEM), and ultraviolet-visible spectroscopy (UV-VIS) were then implemented to characterize the morphology and composition. The organic matrix between the nacre lawyer was removed out after heat treatment, leaving a crack-like gap, and a phase transition occurred at 450 degrees C for 10 min (400 degrees C for 5 h), combined with an expansion of the gap on the cross-section. The porosity and surface area were investigated by the nitrogen adsorption isotherms, which suggested that the nonporosity of each sample. The release amount of hydrogen first decreases, where the phase change occurs and then increases as the temperature increases. The results implied that the hydrophile of morphology and composition (including organic matrix and crystal phase) have a significant impact on the replacement between adsorbed hydrogen and water at the hydration stage, which facilitated the hydrogen release ability. Also, the maximum amount released of 21.1 x 10(3) ppm is achievable at 500 degrees C after loading at pressures of 12 MPa.