Iron Oxyhydroxide Adsorbent Particles for Phosphorus Removal
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Solution Overview
Problem
Conventional adsorbents made of iron oxyhydroxide have limitations in adsorption rate and efficiency for removing phosphorus compounds from wastewater, which are essential for environmental protection and resource recovery.
Innovation Solution
The development of an adsorbent particle comprising iron oxyhydroxide with specific structural and chemical properties, including a high BET specific surface area, granular or columnar crystal structure, and chloride ion substitution, which is produced by adjusting the concentration of salt in the generation process, enhancing its adsorption efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional iron oxyhydroxide adsorbents are used, then phosphorus compounds can be removed from wastewater, but the adsorption rate and efficiency are insufficient
Solution Approach 1:
The invention changes the crystal structure parameters of iron oxyhydroxide by controlling the salt concentration during preparation. Specifically, it uses a salt concentration of 2-10 wt% to generate adsorbent particles with granular or columnar crystal structures having specific surface areas of 250-450 m²/g, which significantly improves both adsorption rate and efficiency compared to conventional adsorbents
Solution Approach 2:
The invention creates a porous adsorbent structure by controlling the crystal morphology during preparation. The resulting granular or columnar crystals with high specific surface area provide extensive porous surfaces for phosphorus compound adsorption, enhancing both the rate and efficiency of the adsorption process
2Reliability
If the salt concentration is increased during adsorbent preparation, then the crystal structure is improved for higher adsorption efficiency, but the manufacturing complexity increases
Solution Approach 1:
The invention simplifies the manufacturing process by identifying a specific salt concentration range (2-10 wt%) that naturally produces the desired granular or columnar crystal structure with high specific surface area. This parameter optimization eliminates the need for complex post-processing or additional manufacturing steps, achieving high adsorption efficiency through a straightforward preparation method
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 resulting adsorbent exhibits higher adsorption efficiency and a shorter adsorption time compared to conventional products, effectively removing phosphorus compounds and other anions from wastewater, with improved capacity and breakthrough point performance.
Implementation Method 1
Adsorbents made of iron oxyhydroxide (FeOOH), which are capable of adsorbing and collecting phosphorus compounds and other anions efficiently
Data Source
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AI summary
An adsorbent which is made of iron oxyhydroxide and which has higher adsorption rate and adsorption efficiency than hitherto is provided. The adsorbent particle of the present invention comprises iron oxyhydroxide as a main component, wherein 90% or more of the volume of the particle is constituted of a granular crystal having a crystal grain size of 20 nm or less or a columnar crystal having a width of 10 nm or less and a length of 30 nm or less and the particle has a BET specific surface area of 250 m2/g or more. The above adsorbent particle is produced by a method comprising a step of generating iron oxyhydroxide by adding a base represented by YOH (wherein Y represents a monovalent atom or atomic group) to a solution comprising at least one selected from trivalent iron compounds represented by FeX3 (wherein X represents a monovalent atom or atomic group other than OH) while adjusting the pH to pH 3 to 6, wherein the solution has a total concentration of FeX3, YOH and other electrolytes of 10% by mass or more at the completion of the step.