Resin-Based Iron Oxide Adsorbent for Phosphate Removal
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Solution Overview
Problem
Existing phosphate removal methods, including chemical precipitation, biological methods, and adsorption, face challenges in stability, adsorption capacity, selectivity, and economic applicability, particularly in treating diverse phosphate-containing waste effluents, and require costly processes to load positive Fe3+ onto anionic resins.
Innovation Solution
A resin-based iron oxide-containing composite phosphate removal adsorbent is prepared through a one-step in-situ hydrolysis process using alkaline potassium ferrate, where ferrate ions are exchanged onto an alkaline anion resin, hydrolyzed into nano-sized hydrated iron oxides, and then washed and dried, simplifying the process and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional methods are used to load positive Fe3+ onto anionic resin, then phosphate removal capacity is improved, but production cost and process complexity greatly increase
Solution Approach 1:
The patent uses inexpensive potassium ferrate as a temporary precursor that decomposes in-situ to generate Fe3+ on the resin. The potassium ferrate serves as a cost-effective, single-use reagent that transforms into the desired iron oxide coating, eliminating expensive traditional loading processes while maintaining high phosphate removal capacity
Solution Approach 2:
The potassium ferrate undergoes spontaneous in-situ hydrolysis and decomposition on the resin surface, automatically generating Fe3+ and forming iron oxide coating without requiring external intervention. This self-service mechanism simplifies the manufacturing process and reduces operational complexity while achieving effective phosphate removal
2Reliability
If complex multi-step processes are used to prepare resin-based iron-containing composite, then adsorption stability is improved, but process complexity and time consumption increase
Solution Approach 1:
The patent combines multiple functions into a single integrated step: potassium ferrate simultaneously serves as the iron source, the loading agent, and the precursor for in-situ hydrolysis. This merging of functions into one-step preparation achieves stable iron oxide coating on resin without requiring separate steps for iron salt addition, pH adjustment, and coating formation
Solution Approach 2:
The potassium ferrate is pre-loaded onto the resin in advance through ion exchange, creating a reservoir of iron precursor that will spontaneously hydrolyze to form the iron oxide coating. This preliminary action ensures stable coating formation without requiring complex subsequent processing steps
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 strong adsorption capacity, fast adsorption speed, high regeneration ability, and multiple reuse times, effectively removing phosphates with high selectivity and stability, even in the presence of interfering anions, and is economically viable.
Implementation Method 1
ferrate ions exchange with anions of the alkaline anion resin
Implementation Method 2
make the ferrate ions exchanged onto the alkaline anion resin hydrolyze into a ferric hydroxide
Implementation Method 3
resin-based iron oxide-containing composite phosphate removal adsorbent
Data Source
AI summary
A preparation method of a resin-based iron oxide-containing composite phosphate removal adsorbent is provided. An alkaline anion resin is taken as a base, a potassium ferrate is used as an iron source, and a characteristics of ferrate ions easily adsorbed on a surface of the anion resin are utilized to prepare resin-based iron oxide-containing composite phosphate removal adsorbent by one-step in-situ hydrolysis precipitation, compared with the related art, a preparation process of the disclosure is relatively simpler, a time period is shorter, and a production cost is lower. It has a strong ability to eliminate interference from other anions in the waste effluents, and it has a strong adsorption capacity, fast adsorption speed and large adsorption capacity for the phosphate. Moreover, it has the advantages of strong regeneration ability and multiple repeated use times.