Binuclear Metal Catalyst for Halogenated Compound Oxidation
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Solution Overview
Problem
Current methods are inadequate for efficiently degrading highly halogenated compounds, particularly fluorinated compounds, due to their stability and the difficulty in oxidizing carbon-halogen bonds under mild conditions, leading to environmental concerns from industrial effluents and wastewater.
Innovation Solution
The use of binuclear metal catalysts with tetradentate macrocyclic ligands, specifically iron binuclear µ-nitrido phthalocyanine complexes, in the presence of hydrogen peroxide as an oxidant, to catalytically oxidize halogenated compounds, breaking carbon-halogen bonds and converting them into less toxic and more biodegradable products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organometallic activation methods are used to transform carbon-halogen bonds, then transformation of fluorinated compounds is achieved, but catalyst accessibility and process simplicity deteriorate due to requiring difficult-to-access catalysts and strictly anhydrous inert conditions
Solution Approach 1:
The invention changes the operational parameters from strictly anhydrous inert conditions to aqueous or moist conditions, allowing the use of simple and inexpensive catalysts. This parameter change enables the degradation of halogenated compounds under mild conditions without requiring complex catalyst systems or specialized atmosphere control.
2Productivity
If high temperature incineration is used to treat halogenated compounds, then effective degradation is achieved, but energy consumption and environmental harm worsen due to high temperature requirements and potential secondary pollution
Solution Approach 1:
The invention employs strong oxidants such as hydrogen peroxide, ozone, or potassium permanganate to achieve efficient degradation of halogenated compounds at mild temperatures. This accelerated oxidation approach replaces high temperature incineration, significantly reducing energy consumption while maintaining high degradation efficiency and avoiding secondary pollution.
3Object-affected harmful factors
If biodegradation by microorganisms is used to treat halogenated compounds, then environmental friendliness is improved, but degradation speed and completeness worsen due to insufficient biodegradation capability for stable highly halogenated aromatic compounds
Solution Approach 1:
The invention introduces chemical oxidants as intermediaries to enhance the degradation process. These oxidants mediate between the stable halogenated compounds and microbial degradation, accelerating the breakdown of carbon-halogen bonds and improving degradation speed while maintaining environmental friendliness through the use of clean oxidants that decompose into water and oxygen.
4Productivity
If conventional oxidation methods are used to treat halogenated compounds, then some degradation is achieved, but effectiveness deteriorates for highly halogenated compounds due to their high stability and resistance to oxidation
Solution Approach 1:
The invention employs powerful oxidants with high oxidation potentials to effectively attack the stable carbon-halogen bonds in highly halogenated compounds. These strong oxidants reliably degrade even the most resistant halogenated aromatics and aliphatic compounds, achieving complete mineralization to CO2, H2O, and halide ions under mild conditions.
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 process effectively degrades halogenated compounds under mild, energy-saving conditions, using a catalyst tolerant to water and air, and a clean oxidant, achieving high conversion rates and mineralization of halogenated pollutants in both organic and aqueous phases.
Implementation Method 1
The use of binuclear metal catalysts with tetradentate macrocyclic ligands, specifically iron binuclear µ-nitrido phthalocyanine complexes, in the presence of hydrogen peroxide as an oxidant, to catalytically oxidize halogenated compounds
Implementation Method 2
catalytically oxidize halogenated compounds, breaking carbon-halogen bonds and converting them into less toxic and more biodegradable products
Data Source
AI summary
The present invention relates to the use of catalysts of formula: (L1)M1-X-M2(L2), in which M1 and M2, which are identical or different, represent metal atoms; X represents a nitrogen atom; and L1 and L2, which may be identical or different, are coordinated with M1 and M2, respectively, and represent tetradentate ligands, for the catalytic oxidation of halogenated compounds.