Foam Glass Adsorbent Surface Modification for Phosphate Recovery
Solution Overview
Problem
Conventional methods for producing anionic substance-adsorbents, such as those used for recycling phosphoric acid, have insufficient adsorption capacity and require prolonged production times, leading to high costs and inefficiencies.
Innovation Solution
Adjusting the concentration of Ca, Na, and SiOX on the surface of foam glass adsorbents through high-temperature alkali treatment or high-pressure treatment in an alkaline solution to enhance their ability to adsorb anionic substances like phosphate and fluoride ions, with specific conditions optimizing the surface area, pore volume, and density for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heating treatment under pressure at 110°C or higher for 2 hours or more is used, then the adsorbent can be produced, but the production time is prolonged and costs increase
Solution Approach 1:
The patent changes the treatment parameters by using a higher temperature (140°C or higher) and optimizing the treatment time to achieve the desired adsorption capacity more quickly. This resolves the contradiction by adjusting temperature and time parameters to reduce production time while maintaining or improving adsorption capacity.
Solution Approach 2:
The patent applies a preliminary high-temperature treatment to the foam glass before use, which prepares the surface in advance to achieve optimal adsorption properties. This preliminary action at higher temperature accelerates the surface modification process, reducing the overall production time while ensuring sufficient adsorption capacity.
2Reliability
If treatment time is extended to 6 hours or more for maximum phosphate anion adsorption, then adsorption ability is maximized, but production costs become prohibitively high
Solution Approach 1:
The patent changes the temperature parameter to 140°C or higher, which accelerates the surface modification kinetics. This allows the adsorbent to achieve maximum phosphate anion adsorption ability in a shorter time, thereby reducing production costs while maintaining high adsorption performance.
Solution Approach 2:
The patent uses high-temperature treatment to rush through the surface modification process more quickly, achieving the desired adsorption capacity in reduced time. This skipping of the prolonged low-temperature treatment phase reduces production costs while maintaining effectiveness.
3Adaptability or versatility
If foam glass is used as waste material, then resource recycling is achieved, but the adsorption capacity is insufficient
Solution Approach 1:
The patent applies high-temperature treatment (140°C or higher) to modify the surface properties of waste foam glass, transforming it into an effective adsorbent. This parameter change activates the waste material's potential, achieving both waste utilization and sufficient adsorption capacity for phosphate and fluoride anions.
Solution Approach 2:
The patent converts waste foam glass, which would otherwise be discarded, into a valuable adsorbent material through high-temperature treatment. This transforms the harmful waste disposal problem into a beneficial resource recycling solution, achieving both environmental and functional goals.
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
The modified adsorbents demonstrate significantly improved capacity to adsorb anionic substances, achieving higher adsorption rates in shorter production times, thereby reducing costs and enhancing industrial efficiency.
Implementation Method 1
treating a foam glass material in an alkaline solution containing an alkali metal hydroxide in an amount of 1 mol/L or more at a temperature of 140° C. or higher
Implementation Method 2
anionic substance-adsorbent comprising foam glass, a surface of the adsorbent exhibiting a Ca2p concentration of 7.5 at % or more or a Na1s concentration of 5.0 at % or less
Data Source
AI summary
An adsorbent for phosphoric acid-based anionic substances, that contains foamed glass, and that has a Ca2p concentration of 7.5 atom % or more or a Na1s concentration of 5.0 atom % or less at the surface thereof as measured by XPS analysis, and a half-width of Si2p peak of 2.4 eV or more. The adsorbent can also have a specific surface area of 45 m2/g or more or a pore volume of 2.5 cm3/g or more as measured by mercury intrusion.