SPION Adsorbent Regeneration via Thermo-Redox Desorption
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Solution Overview
Problem
Current methods for arsenic removal and adsorbent regeneration are inefficient, as they require expensive reagents and lack effective desorption processes, leading to high costs and challenges in recycling and disposing of concentrated arsenic wastes.
Innovation Solution
A method utilizing superparamagnetic iron oxide nanoparticle (SPION) based adsorbent filters that leverages temperature and redox potential adjustments to achieve arsenic desorption and sorbent regeneration without the need for additional reagents, allowing for efficient recovery and reuse of the adsorbent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional desorption methods using alkaline solutions are used, then arsenic can be desorbed from the adsorbent, but the process becomes expensive and complex due to the need for large amounts of reagents
Solution Approach 1:
The patent changes the pH parameter of the solution to achieve desorption. By adjusting the pH to acidic conditions (adding acid to the solution), arsenic is desorbed from the adsorbent without requiring complex alkaline solutions or multiple reagents, thus simplifying the process while maintaining effectiveness
Solution Approach 2:
The patent extracts arsenic from the adsorbent using a simple acid solution, separating the arsenic from the adsorbent material. This extracted arsenic can then be disposed of or recovered, while the adsorbent is regenerated for reuse, eliminating the need for complex regeneration systems
2Object-affected harmful factors
If adsorbent is used for arsenic removal, then arsenic can be effectively removed from water, but the adsorbent becomes exhausted and requires expensive regeneration or disposal
Solution Approach 1:
The patent implements a system where arsenic is recovered from the adsorbent through acid treatment. The adsorbent is regenerated and can be reused for multiple cycles, while the concentrated arsenic is separated for safe disposal or further processing, thus preventing loss of the adsorbent material
Solution Approach 2:
By changing the pH parameter (adding acid), the patent enables reversible adsorption-desorption cycles. The adsorbent can switch between adsorbing arsenic at neutral pH and releasing it at acidic pH, allowing multiple reuse cycles without degradation or expensive regeneration
3Productivity
If concentrated arsenic is recovered from the desorption process, then arsenic removal efficiency is improved, but the disposal of concentrated arsenic waste becomes difficult and expensive
Solution Approach 1:
The patent converts the harmful concentrated arsenic waste into a manageable form by using acid to desorb arsenic from the adsorbent. The resulting acidic arsenic solution can be treated with base to precipitate arsenic as a solid, transforming the liquid waste into a solid that is easier to handle, transport, and dispose of safely
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 approach enables nearly complete arsenic desorption and sorbent regeneration, significantly reducing costs and environmental impact by allowing for multiple cycles of adsorption-desorption with high recovery proportions and minimal reagent use.
Implementation Method 1
The adsorption from solution has attracted more attention due to its simple procedure that overcomes most of the drawbacks of other techniques
Implementation Method 2
a method for desorption of iron binding metals and oxyanions from superparamagnetic iron oxide nanoparticles (SPION) based adsorbent filters comprising the increase of the temperature of the SPION based adsorbent filters up to 70°C or above
Implementation Method 3
wherein a redox compound is added, and wherein the redox compound is zinc (Zn) or tin (Sn) powder
Data Source
Figure 1A~1C
Figure 2
Figure 3
AI summary
The invention relates to a new method for Arsenic adsorption- desorption and sorbent regeneration with no reagents added by taking advantage of the synergic thermo tuning of redox potential of the adsorption-desorption system.