College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China.
Molecules. 2020 Jul 7;25(13):3092. doi: 10.3390/molecules25133092.
In this work, an organic-free method was used to synthesize different morphological boehmite by controlling the crystallization temperature, and alumina adsorbents were obtained by baking the boehmites at 500 °C. The alumina adsorbents were characterized by X-ray diffraction (XRD), High resolution transmission electron microscope (HRTEM), Fourier transform infrared (FT-IR), N adsorption/desorption analysis, and their phosphorus adsorption properties were comparatively investigated by a series of experiments. The results showed that the self-prepared alumina adsorbents were lamellar and fibrous material, while the industrial adsorbent was a granular material. The lamellar alumina adsorbents had the largest specific surface area and showed better phosphorus adsorption capacity. The maximum adsorption capacity could reach up to 588.2 mg·g; and only 0.8 g·L of lamellar alumina adsorbent is needed to treat 100 mg·L phosphorus solution under the Chinese level 1 discharge standard (0.5 mg·L). Further investigation suggests that the lamellar alumina adsorbent kept high adsorption capacity in various solution environments.
在这项工作中，我们采用无有机试剂的方法通过控制晶化温度合成了不同形貌的一水软铝石，然后将所得的一水软铝石在 500°C 下煅烧得到氧化铝吸附剂。通过 X 射线衍射（XRD）、高分辨率透射电子显微镜（HRTEM）、傅里叶变换红外光谱（FT-IR）、N2 吸附/脱附分析对氧化铝吸附剂进行了表征，并通过一系列实验比较了它们的磷吸附性能。结果表明，自制的氧化铝吸附剂为层状和纤维状材料，而工业吸附剂为颗粒状材料。层状氧化铝吸附剂具有最大的比表面积，表现出更好的磷吸附能力。最大吸附容量可达 588.2mg·g-1；仅需 0.8g·L 的层状氧化铝吸附剂即可处理 100mg·L 的磷溶液，达到中国一级排放标准（0.5mg·L）。进一步的研究表明，在各种溶液环境中，层状氧化铝吸附剂都保持着较高的吸附容量。
