Nano-Hydroxyapatite from Decarbonized Eggshells by Microwave Heating
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Solution Overview
Problem
Existing methods for converting eggshell waste into hydroxyapatite (HAp) are not economically and environmentally appealing, and there is a need for a more sustainable and efficient process.
Innovation Solution
A method involving decarbonization of eggshells using an inorganic base in a polar solvent to form calcium hydroxide and sodium carbonate, followed by mixing with a phosphate salt and microwave irradiation to produce hydroxyapatite, which is then filtered and dried.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If eggshells are converted into hydroxyapatite using traditional methods, then hydroxyapatite product is obtained, but the process is not economically and environmentally appealing
Solution Approach 1:
The patent changes the chemical parameters of the conversion process by using decarbonized eggshells (removing carbonate) and treating with calcium hydroxide solution, transforming the traditional direct conversion method into a two-step process that achieves better environmental and economic outcomes through parameter optimization
Solution Approach 2:
The patent replaces traditional high-energy mechanical processing methods with a chemical treatment approach using calcium hydroxide solution, which reduces energy consumption and improves economic viability while maintaining environmental benefits
2Productivity
If eggshells are directly converted to hydroxyapatite, then the process is simple, but the conversion efficiency and product quality are insufficient
Solution Approach 1:
The patent applies preliminary decarbonization treatment to eggshells before conversion, removing carbonate content in advance to improve the quality and efficiency of hydroxyapatite production, thereby achieving better conversion efficiency without excessive process complexity
Solution Approach 2:
The patent introduces calcium hydroxide solution as an intermediary substance that facilitates the conversion of decarbonized eggshells to hydroxyapatite, improving reaction efficiency and product quality while maintaining a manageable process complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process achieves high conversion of eggshells into HAp, producing nanorods with specific atomic composition and crystalline structure, aligning with circular economy principles and reducing environmental impact.
Implementation Method 1
microwave irradiating the mixture for 1 to 10 minutes (min) at a temperature from 80 to 120 degrees Celsius (° C.)
Implementation Method 2
reacting eggshells with an inorganic base in a polar solvent to decarbonize the eggshells and form a calcium hydroxide material and a sodium carbonate material
Data Source
AI summary
A method of synthesizing a hydroxyapatite (HAp) product from eggshells, including reacting eggshells with an inorganic base in a polar solvent to decarbonize the eggshells and form a calcium hydroxide material and a sodium carbonate material and mixing the calcium hydroxide material, in a polar solvent at a pH of greater than 10, with a phosphate salt to form a mixture including the hydroxyapatite product. A ratio of the calcium hydroxide material to the phosphate salt is from 1:1 to 5:1. The method further includes microwave irradiating the mixture for 1 to 10 minutes (min) at a temperature from 80 to 120 degrees Celsius (° C.), filtering the mixture to collect the hydroxyapatite product, and further drying the hydroxyapatite product.