Anchored Hexacyano Catalyst for Wastewater Mineralization
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Solution Overview
Problem
Conventional advanced oxidation processes (AOPs) struggle to achieve complete mineralization of organic pollutants in water and wastewater due to the formation of more oxygen-rich byproducts and the impairment of hydroxyl radical availability by natural organic matter, leading to less than 50% total organic carbon (TOC) removal, despite energy-intensive operations.
Innovation Solution
A catalytic material comprising a hexacyano metal compound, such as cobalt hexacyanocobaltate, anchored onto a porous inorganic substrate like a ceramic filtration membrane, effectively activates peroxide precursors to produce reactive radicals, achieving complete mineralization of organic pollutants with residual peroxide concentrations below 10 ppm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional AOPs are used to oxidize organic pollutants, then oxidation capability is improved, but mineralization efficiency deteriorates (less than 50% TOC removal)
Solution Approach 1:
The patent changes the chemical parameters of the oxidation system by introducing a heterogeneous catalyst (transition metal complex on solid support) to activate peroxymonosulfate, generating sulfate radicals with different reactivity characteristics than hydroxyl radicals. This parameter change enables complete mineralization of organic pollutants to CO2 while maintaining oxidation power.
Solution Approach 2:
The patent uses a heterogeneous catalyst as an intermediary substance that facilitates the activation of peroxymonosulfate to generate sulfate radicals. The catalyst acts as a mediator between the oxidant and the organic pollutants, enabling efficient electron transfer and radical generation without being consumed in the reaction.
2Use of energy by moving object
If energy-intensive AOPs with UV-irradiation and electric current are employed, then radical generation is enhanced, but mineralization achievement deteriorates (still less than 50% TOC removal)
Solution Approach 1:
The patent replaces the mechanical/physical energy input systems (UV irradiation and electric current) with a chemical catalytic system. The transition metal complex catalyst chemically activates peroxymonosulfate to generate sulfate radicals through electron transfer, substituting the need for external UV or electrical energy input while achieving superior mineralization.
Solution Approach 2:
The patent changes the energy input parameter from high-energy UV photons or electrical current to chemical energy stored in peroxymonosulfate bonds. The heterogeneous catalyst facilitates this energy conversion, allowing the system to achieve complete mineralization through chemical activation rather than physical energy input.
3Productivity
If heterogeneous transition-metal catalysts are used to increase radical generation rate, then radical production is improved, but catalyst lifetime deteriorates (extremely short lifetimes)
Solution Approach 1:
The patent creates a composite material system where a transition metal complex is immobilized on a solid support (such as activated carbon, silica, or magnetic particles). This composite structure combines the high catalytic activity of the metal complex with the stability and longevity of the solid support, achieving both high radical generation rates and extended catalyst lifetime.
Solution Approach 2:
The patent employs porous solid support materials with high surface area to immobilize the transition metal complex. The porous structure provides numerous anchoring sites for the catalyst while allowing efficient mass transfer of reactants and products, maintaining high catalytic activity over extended periods and enabling catalyst recovery and reuse.
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 system achieves over 90% mineralization of organic pollutants in aqueous sources, including municipal and industrial wastewaters, with enhanced radical production and reduced byproduct formation, outperforming traditional UV/H2O2 and UV/TiO2 processes.
Implementation Method 1
A catalytic material comprising a hexacyano metal compound, such as cobalt hexacyanocobaltate, anchored onto a porous inorganic substrate like a ceramic filtration membrane, effectively activates peroxide precursors to produce reactive radicals
Implementation Method 2
The system achieves over 90% mineralization of organic pollutants in aqueous sources, including municipal and industrial wastewaters, with enhanced radical production and reduced byproduct formation
Data Source
AI summary
Disclosed herein is a catalytic comprising a hexacyano metal compound; wherein the hexacyano metal compound comprises a metal selected from the group consisting of cobalt, iron, copper, manganese, nickel, zinc, and combinations thereof; wherein the hexacyano metal compound comprises coordinatively unsaturated metal (II)—N—C centers for; and wherein the hexacyano metal compound is anchored onto an inorganic substrate. Also disclosed are a system including the catalytic material and a process for treating wastewater using the catalytic material.