Unveiling the Role of Polysulfide Matrices in Phosphate Diffusion for Controlled Release Fertilizers,ACS Applied Polymer Materials

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Unveiling the Role of Polysulfide Matrices in Phosphate Diffusion for Controlled Release Fertilizers
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-08-16 , DOI: 10.1021/acsapm.3c00988
Stella F. Valle _{1,

2} , Amanda S. Giroto ₂ , Caue Ribeiro ₂

Affiliation

Phosphate rock and struvite (ST) dispersion in a polysulfide (PS) matrix offers a sustainable alternative for phosphorous (P) fertilization, as it can favor P dissolution and control its release, while also being a sulfur fertilizer. Herein, we discuss the PS permeability mechanism as well as the chemical and structural factors that affect P diffusion from PS composites. SEM and contact angle showed that P particles increased PS porosity and hydrophilicity, which favors P release. Within 7 days in soil, Fe-oxide papers revealed that the P-diffusion diameter was only 0.3 cm for ST against up to 2.3 cm from the PS composite. In 28 days, available P in soil from the apatite increased from 6 to up to 79 mg/dm³ due to its dispersion in PS. In the adapted Ussing Chamber permeability test, PS displayed higher affinity toward anion permeability and a negligible cation diffusion, which might contribute to the gradual P release and higher availability in soil.

中文翻译：

揭示多硫化物基质在控释肥料磷酸盐扩散中的作用

磷矿和鸟粪石 (ST) 在多硫化物 (PS) 基质中的分散体为磷 (P) 施肥提供了一种可持续的替代方案，因为它可以促进磷的溶解并控制其释放，同时也是一种硫肥料。在此，我们讨论了 PS 渗透机制以及影响 P 从 PS 复合材料中扩散的化学和结构因素。SEM和接触角表明P颗粒增加了PS的孔隙率和亲水性，有利于P的释放。在土壤中 7 天内，氧化铁试纸显示 ST 的 P 扩散直径仅为 0.3 厘米，而 PS 复合材料的 P 扩散直径高达 2.3 厘米。28 天内，土壤中来自磷灰石的有效磷从 6 mg/dm 3 增加到 79 mg/dm ³由于其在PS中的分散性。在改编的尤斯室渗透性测试中，PS 对阴离子渗透性表现出更高的亲和力，并且阳离子扩散可忽略不计，这可能有助于土壤中磷的逐渐释放和更高的有效性。

更新日期：2023-08-16

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