Effect of temperature and pH value on the stability of magnesium potassium phosphate hexahydrate

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS International Journal of Applied Ceramic Technology Pub Date : 2024-10-03 DOI:10.1111/ijac.14931

Bo Pang, Yuanhong Zhao, Guanhua Zhang, Jinbo Guo, Runqing Liu

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Abstract

Magnesium potassium phosphate hexahydrate (MgKPO₄·6H₂O) was used as solidification matrix to immobilize some radioactive element and some heavy metal ions, the stability of MgKPO₄·6H₂O under different conditions had become the focus. This work gives new insights on the stability of synthesized MgKPO₄·6H₂O in the different temperatures and pH values solutions. The solid phase transformed from synthesized MgKPO₄·6H₂O was characterized by X-ray diffractometer (XRD), thermal gravity analysis (TG/DSC), Fourier-transform infrared spectrum (FTIR) and scanning electron microscope (SEM) at different temperature and pH values solution. Results indicated MgKPO₄·6H₂O had almost no phase transition at the temperature of 50°C and 60°C. Mg₃(PO₄)₂·22H₂O appears with the increase of solution temperature. The main phase is MgKPO₄·6H₂O at the pH of 9 and 12, minor MgHPO₄·3H₂O formed at the pH of 6, next Mg₃(PO₄)₂·22H₂O formed at the pH of 3 and 6. High pH value environment is beneficial for the maintenance of MgKPO₄·6H₂O. This study is an important guidance for the application of MgKPO₄·6H₂O crystal.

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温度和pH值对六水磷酸镁钾稳定性的影响

以六水磷酸钾镁（MgKPO4·6H2O）为固化基质，固定化某些放射性元素和重金属离子，不同条件下MgKPO4·6H2O的稳定性成为研究的重点。本工作对合成的MgKPO4·6H2O在不同温度和pH值溶液中的稳定性有了新的认识。采用x射线衍射仪（XRD）、热重分析（TG/DSC）、傅里叶红外光谱（FTIR）和扫描电镜（SEM）对合成的MgKPO4·6H2O固相进行了表征。结果表明：MgKPO4·6H2O在50℃和60℃温度下几乎没有发生相变；Mg3(PO4)2·22H2O随着溶液温度的升高而出现。pH为9和12时主要相为MgKPO4·6H2O， pH为6时次要相为MgHPO4·3H2O， pH为3和6时次要相为Mg3(PO4)2·22H2O。高pH值环境有利于MgKPO4·6H2O的维持。本研究对MgKPO4·6H2O晶体的应用具有重要的指导意义。

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来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;