Abstract Two forms of zinc-aluminium layered double hydroxides (ZnAl-LDH) with borate association (iZA and cZA) were prepared by ion-exchange process and in-situ co-precipitation. The received materials were examined using several characterization techniques, e.g. x-ray diffraction (XRD), scanning- and transmission-electron microscopy (SEM and TEM). The XRD diffractograms suggested that only monoborate ions (possibly trigonal and tetrahedral forms) were involved in the intercalation and adsorption. Elemental analyses, i.e. inductive coupled plasma-optical emission and atomic absorption spectroscopies, were used to determine the starting zinc and boron compositions, and the contents after the dissolution experiment in water, soil, and plant growth study. The iZA and cZA samples were found to controlled-release Zn and B contents which can be used as micronutrient sources in agricultural application. The releases of the two nutrients are suggested to initiate from the anionic-exchange of BO33 − and the transformation of Zn2 + from LDH basal plane. The plant experiments treated with these iZA and cZA exhibit improvements in plant growth, evidently attributed to the controlled and sustainable releases of boron and zinc for assisting macronutrient uptakes when used with the NPK fertilizer.

中文翻译：

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作为农业应用微量营养素宿主的层状双氢氧化物硼和锌的控释研究

摘要 采用离子交换法和原位共沉淀法制备了两种形式的具有硼酸盐缔合的锌铝层状双氢氧化物（ZnAl-LDH）（iZA和cZA）。使用多种表征技术检查收到的材料，例如 X 射线衍射 (XRD)、扫描和透射电子显微镜 (SEM 和 TEM)。XRD 衍射图表明只有单硼酸盐离子（可能是三角和四面体形式）参与嵌入和吸附。元素分析，即电感耦合等离子体光发射和原子吸收光谱，用于确定起始锌和硼的组成，以及在水、土壤和植物生长研究中溶解实验后的含量。发现 iZA 和 cZA 样品中的 Zn 和 B 含量可控，可用作农业应用中的微量营养素来源。这两种营养物质的释放被认为是从 BO33 - 的阴离子交换和 LDH 基面的 Zn2 + 转化开始的。用这些 iZA 和 cZA 处理的植物实验表现出植物生长的改善，这显然归因于当与 NPK 肥料一起使用时，硼和锌的受控和可持续释放有助于大量营养素的吸收。