Abstract New technologies have been developed to slow down the phosphorus release in the soil and prevent the loss to the environment by using layered double hydroxides (LDH). However, slow-releasing mechanisms in inorganic matrices are not often discussed in the literature, and post-release sorption-desorption processes have also not been taken into account. Thus, kinetic and sorption processes of P in soils were herein investigated employing a modified LDH. The modification was carried out by the reconstruction method in the P solution. The material (HTCP) was characterized by FT-IR and XRD. The release of P to the soil solution was slow. Around 11% of the P introduced in the LDH was released to the clayey soil solution, and 5.5% to the sandy soil solution over 45 days (1080 h). Kinetic models of first-order and second-order, Elovich, intraparticle diffusion, and power function were applied. The intraparticle diffusion model best described the P release in clayey soil, characterizing ion exchange, while the second-order model better adjusted the release in sandy soil. The dual-mode Langmuir-Freundlich model appropriately described the sorption of P in the soil samples, being the desorption almost null. Although some of the P was sorbed, the post-sorption pH remained in a viable range for making P available to the plants, revealing the benefits of using HTCP for slow-release fertilizers.

中文翻译：

---

用于磷缓释的改性水滑石：巴拉那州北部（巴西）粘土和沙质土壤中的动力学和吸附-解吸过程

摘要 已经开发出新技术来减缓土壤中磷的释放，并通过使用层状双氢氧化物 (LDH) 来防止其向环境流失。然而，文献中并不经常讨论无机基质中的缓释机制，也没有考虑释放后的吸附-解吸过程。因此，本文采用改良的 LDH 研究了土壤中 P 的动力学和吸附过程。修改是通过P解中的重构方法进行的。材料 (HTCP) 通过 FT-IR 和 XRD 进行表征。磷释放到土壤溶液中是缓慢的。在 45 天（1080 小时）内，LDH 中约 11% 的 P 释放到粘土溶液中，5.5% 释放到沙质土壤溶液中。一阶和二阶动力学模型，Elovich，应用了粒子内扩散和幂函数。颗粒内扩散模型最好地描述了粘质土壤中 P 的释放，表征了离子交换，而二阶模型更好地调整了沙质土壤中的释放。双模式 Langmuir-Freundlich 模型恰当地描述了土壤样品中 P 的吸附，解吸几乎为零。尽管一些 P 被吸附了，但吸附后的 pH 值仍保持在一个可行的范围内，使植物可利用 P，这揭示了使用 HTCP 作为缓释肥料的好处。双模式 Langmuir-Freundlich 模型恰当地描述了土壤样品中 P 的吸附，解吸几乎为零。尽管一些 P 被吸附了，但吸附后的 pH 值仍保持在一个可行的范围内，使植物可利用 P，这揭示了使用 HTCP 作为缓释肥料的好处。双模式 Langmuir-Freundlich 模型恰当地描述了土壤样品中 P 的吸附，解吸几乎为零。尽管一些 P 被吸附了，但吸附后的 pH 值仍保持在一个可行的范围内，使植物可利用 P，这揭示了使用 HTCP 作为缓释肥料的好处。