Influence of Ca/P ratio on the catalytic performance of hydroxyapatite for decarboxylation of itaconic acid to methacrylic acid

Pang, Shutong; An, Hualiang; Zhao, Xinqiang; Wang, Yanji

doi:10.1016/j.cjche.2022.01.012

Cited by 4 publications

(2 citation statements)

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“…This sample was produced at a lower pH than the rest of the samples at pH 8, while the rest of the samples were produced at pH 10.8 and above. This can be explained by the fact that the pH value during the synthesis of HAp NPs might impact the Ca:P ratio of the produced particles. , This can be explained by the fact that the pH affects the form of the phosphate anion (i.e., H 2 PO 4 – , HPO 4 2– , and PO 4 3– ). As the pH of the solution rises, PO 4 3– is the main form of the phosphate anion present in the solution, favoring the formation of hydroxyapatite particles with a high Ca/P molar ratio.…”

Section: Resultsmentioning

confidence: 99%

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Scalable Synthesis of Size-Tunable Hydroxyapatite Nanoparticles as Potential Nanofertilizers

Burve,

Loeschner,

Omura Lund

et al. 2024

ACS Appl. Nano Mater.

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Hydroxyapatite is a biocompatible material with various applications. To meet the demand for industrial use of this material, a rapid and upscalable process for the synthesis of hydroxyapatite nanoparticles was developed using an in-house developed two-stage continuous flow hydrothermal reactor. In the framework of this study, phase pure and highly crystalline 30 to 115 nm long hydroxyapatite nanorods were produced for potential use as nanofertilizers. The phase composition of the nanorods was confirmed by X-ray diffraction. Particle size and shape were investigated using transmission electron microscopy. Inductively coupled plasma mass spectrometry was used to determine the Ca:P ratio. It was shown that the use of a second mixing stage allows the particle length to be decreased down to 30 nm without compromising on crystallinity. In addition to using different mixing stages, adjusting the pH and controlling the flow speed allow wide range size tuning of the produced particles. The experimental setup allows for continuous synthesis of phase pure and highly crystalline hydroxyapatite nanorods, ensuring the reproducibility and scalability of the process. Dispersive behavior and dissolution in citrate buffer at a hydroponic pH of 5.5 were studied to evaluate further possibilities of applying produced NPs on the plants.

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Section: Resultsmentioning

confidence: 99%

“…This can be explained by the fact that the pH value during the synthesis of HAp NPs might impact the Ca:P ratio of the produced particles. 27,28 This can be explained by the fact that the pH affects the form of the phosphate anion (i.e., H 2 PO 4 − , HPO 4 2− , and PO 4 3−…”

Section: Icp-ms Datamentioning

confidence: 99%