A novel route to enhance the dissolution of apatite: Structural incorporation of hydrogen phosphate

Sakhno, Yuriy; Miletto, Ivana; Paul, Geo; Jaisi, Deb P.

doi:10.1016/j.impact.2022.100422

Cited by 2 publications

(15 citation statements)

References 65 publications

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“…In fact, HANP 7,95 prepared at pH 6 (Figure A zoom) has slightly lower absorption at 874 cm –1 due to the lower amount of incorporated carbonate but is greater at 897 cm –1 compared to the other two HAs prepared at pH 10. This finding indicates that HANP 7,95 possesses an extra proton on phosphate, which is known to facilitate dissolution and was proven in our previous study . Another absorption that appears conspicuous in HANP 7,95 is the shoulder at 1214 cm –1 , which is also assigned to the HPO 4 2– vibration and is absent in other HANPs synthesized at basic pH.…”

Section: Resultsmentioning

confidence: 99%

“…The reason for this is explained by the difference in proton content and was confirmed by dissolution results (between HANP 10,95 and HANP 7,95 in Figure ). Further confirmation of the protonated phosphate in HANPs was made in a recent study …”

Section: Resultsmentioning

confidence: 99%

“…This finding indicates that HANP 7,95 possesses an extra proton on phosphate, which is known to facilitate dissolution 26 and was proven in our previous study. 14 Another absorption that appears conspicuous in HANP 7,95 is the shoulder at 1214 cm −1 , which is also assigned to the HPO 4 2− vibration and is absent in other HANPs synthesized at basic pH. Note that the same absorption at 1214 cm −1 also contributes to DCPA (Figure 2C) and is assigned to P−O−H in-plane bending.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…26 The presence of HPO 4 2− species that occupy the PO 4 3− position in the HANP lattice has recently been confirmed by [ 1 H−P] 1 H double crosspolarization magnetic angle spinning solid-state nuclear magnetic resonance (ssNMR) in apatite. 14,29 Here, the presence of protons in HANP 7,95 was evidenced from FTIR absorbance at 897 and 1214 cm −1 (Figure 2). While it is known that A-type carbonated HA has higher solubility, our study shows that protons have a more dominant effect over carbonate in affecting the dissolution.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…Conversely, when the pH is below the IEP, depending on the nature of precursors, other Ca–P products, such as dicalcium phosphate CaHPO 4 (DCPA), can form. The solubility of DCPA is >10 times higher than HA because it possesses one H + per Ca 2+ cation in the chemical formula, although the solubility is still approximately 100 times lower than that of superphosphate . This suggests that materials with solubilities ranging between the values of HA and DCPA are good candidates as controlled-release P fertilizers.…”

Section: Introductionmentioning

confidence: 99%

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Role of Cation Substitution and Synthesis Condition in a Calcium Phosphate-Based Novel Nanofertilizer on Lettuce (Lactuca sativa) Yield

Sakhno

Borgatta

et al. 2022

ACS Sustainable Chem. Eng.

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Hydroxyapatite nanoparticles (HANPs) have received increasing attention as a potential novel fertilizer. Although stoichiometric HANPs have limited solubility, they can be tuned for more controlled phosphorus (P) release applications. To enhance the dissolution for maximizing P delivery to plants, we synthesized HANPs and dicalcium phosphate anhydride (DCPA) under varying crystallization conditions (temperature, pH, and cation substitution). The efficacy of these materials in improving lettuce (Lactuca sativa) yield was investigated in the greenhouse. Comparative analyses of shoot and root biomass, tissue nutrient content, and P loss in the leachate show that all HANPs and DCPA stimulated lettuce growth, but the extent of enhancement was a function of synthesis condition. Lettuce fertilized with DCPA, a more soluble Ca–P product, showed two times higher crop yield than controls, but P loss in leachate was the highest. On the other hand, lettuce fertilized with HANPs synthesized at pH 7.0 resulted in a 73% greater crop yield than the control, and the P loss to leachate was lowest among all Ca–P products tested. Considering the 'green' efficiency that accounts for both promoting plant growth and limiting P loss, HANP synthesized at pH 7.0 is found to be more optimal. These results demonstrate that tuning the properties of HANPs is an effective approach to optimize P release to enhance crop yield and minimize P loss. These outcomes also provide a scientific basis for developing tunable nanofertilizers specific to a crop or soil condition and, thus, a sustainable approach toward meeting global food demands while simultaneously minimizing the negative environmental impacts of agriculture.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Role of Cation Substitution and Synthesis Condition in a Calcium Phosphate-Based Novel Nanofertilizer on Lettuce (Lactuca sativa) Yield

Sakhno

Borgatta

et al. 2022

ACS Sustainable Chem. Eng.

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Citrate-Stabilized Amorphous Calcium Phosphate Nanoparticles Doped with Micronutrients as a Highly Efficient Nanofertilizer for Environmental Sustainability

Sakhno,

Degli Esposti,

Adamiano

et al. 2023

ACS Agric. Sci. Technol.

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The increase in the global use of phosphorus (P) fertilizers for crop production has generated a series of unintended negative consequences. In response, there is growing interest in developing new fertilizers that curb adverse effects. Among them, amorphous calcium phosphate (ACP) is a viable alternative because of its tunable solubility for P release, high specific surface area, and ability to be doped with vital microelements essential for crops. Herein, we prepared a series of citrate-stabilized ACP nanoparticles (ACPc) doped with micronutrients (B, Cu, Mg, and Zn) and analyzed their dissolution and nutrient release characteristics. Comparative analysis of undissolved ACPc, released ions, and pH of eluted buffer showed a strong positive correlation between the P release rate and the corresponding change in buffer pH. The competitive advantage of ACPc against a monocalcium phosphate (MCP), a conventional commercial fertilizer, for providing P nutrition to plants was tested in lettuce (Lactuca sativa) plants in a greenhouse study. The results showed that undoped ACPc stimulated a 20% higher lettuce crop yield than that of MCP, and the doping with multimicronutrients increased the yield by 22%. More importantly, P resource use efficiency (RUE), calculated based on crop yield and P lost in leachate, was significantly higher in all ACPc than MCP and was about an order of magnitude higher in undoped and multimicronutrient doped ACPc. These results demonstrate that multimicronutrient doping in ACPc is a more efficient and sustainable approach for the dual delivery of P and micronutrients and thus contributes toward meeting the global food demands while minimizing the negative environmental impacts of agriculture.

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A novel route to enhance the dissolution of apatite: Structural incorporation of hydrogen phosphate

Cited by 2 publications

References 65 publications

Role of Cation Substitution and Synthesis Condition in a Calcium Phosphate-Based Novel Nanofertilizer on Lettuce (Lactuca sativa) Yield

Role of Cation Substitution and Synthesis Condition in a Calcium Phosphate-Based Novel Nanofertilizer on Lettuce (Lactuca sativa) Yield

Citrate-Stabilized Amorphous Calcium Phosphate Nanoparticles Doped with Micronutrients as a Highly Efficient Nanofertilizer for Environmental Sustainability

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