MOFs/COFs Heterojunction Photocatalyst via Mechanical Grinding
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Solution Overview
Problem
Existing photocatalyst preparation methods for pollutant degradation, such as carbamazepine in aquatic environments, are time-consuming, labor-intensive, and environmentally burdensome, with limited efficiency and light absorption range, especially under visible light.
Innovation Solution
A MOFs/COFs heterojunction composite photocatalyst is prepared using a mechanical grinding method with melamine, 1,3,5-trimethylphloroglucinol, 2-aminoterephthalic acid, and ferrous acetate, facilitated by a p-toluenesulfonic acid catalyst, which enhances light absorption and photocatalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional photocatalyst preparation methods (sol-gel, hydrothermal, etc.) are used, then photocatalytic activity can be achieved, but the preparation process becomes time-consuming, labor-intensive, and environmentally burdensome
Solution Approach 1:
The patent replaces chemical preparation methods (sol-gel, hydrothermal) with a mechanical grinding method using a planetary ball mill. This substitution eliminates the need for complex chemical reactions, long heating times, and multiple washing steps, reducing preparation time from hours/days to just minutes while maintaining photocatalytic activity through mechanical activation and heterojunction formation.
Solution Approach 2:
The patent changes the preparation parameters from conventional chemical synthesis (controlled pH, temperature, time) to mechanical parameters (grinding time, ball-to-powder ratio, milling speed). This parameter transformation enables rapid photocatalyst synthesis with consistent performance, eliminating the time-consuming nature of traditional methods while preserving photocatalytic functionality.
2Reliability
If traditional photocatalysts (TiO2, ZnO) are used, then degradation of organic pollutants can be achieved under ultraviolet light, but the light absorption range is limited
Solution Approach 1:
The patent creates a composite heterojunction material combining MOFs (metal-organic frameworks) and COFs (covalent organic frameworks). This composite structure integrates the advantages of both materials: MOFs provide high surface area and metal active sites, while COFs contribute extended π-conjugation systems for visible light absorption. The heterojunction interface facilitates efficient charge separation and extends light absorption into the visible range, overcoming the UV-only limitation of traditional TiO2 and ZnO photocatalysts.
Solution Approach 2:
The patent segments the photocatalyst into two distinct functional components (MOF and COF) that work synergistically. The MOF component handles catalytic activity and the COF component handles light harvesting, with the interface between them enabling efficient electron-hole separation. This segmentation allows each component to be optimized for its specific function while achieving enhanced overall performance in both visible light absorption and pollutant degradation.
3Reliability
If existing photocatalyst preparation methods are used, then carbamazepine degradation can be achieved, but the process consumes large amounts of reagents and solvents, adding environmental burden
Solution Approach 1:
The patent replaces wet chemical synthesis methods that require large volumes of solvents (water, ethanol, DMF) and reagents with a dry mechanical grinding method. The planetary ball mill enables direct solid-state reaction of precursors, eliminating the need for solvent-based chemistry while producing the same photocatalytic product. This dramatically reduces reagent and solvent consumption, removing the environmental burden associated with traditional preparation methods.
Solution Approach 2:
The patent uses simple, inexpensive starting materials (metal salts and organic linkers) that can be ground directly without requiring purification or special handling. The mechanical method allows direct use of commercial-grade reagents, eliminating the need for multiple washing and purification steps that consume large amounts of solvents. The process is designed to be inherently clean, producing minimal waste.
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 MOFs/COFs heterojunction composite photocatalyst exhibits improved degradation efficiency for carbamazepine, with rapid response under visible light, overcoming limitations of single MOFs or COFs catalysts, and offers a more environment-friendly and efficient preparation process.
Implementation Method 1
MOFs/COFs heterojunction composite photocatalyst... exhibits improved degradation efficiency for carbamazepine, with rapid response under visible light
Implementation Method 2
A MOFs/COFs heterojunction composite photocatalyst is prepared using a mechanical grinding method with melamine, 1,3,5-trimethylphloroglucinol, 2-aminoterephthalic acid, and ferrous acetate
Data Source
AI summary
The application belongs to the technical field of photocatalyst preparation, and specifically relates to a MOFs/COFs heterojunction composite photocatalyst and a preparation method and application thereof. The application uses melamine (MA), 1,3,5-trimethylphloroglucinol (Tp), 2-aminoterephthalic acid, and ferrous acetate as reaction raw materials, a catalyst is added, and a mechanical grinding method is used, to prepare the MOFs/COFs heterojunction composite photocatalyst. The catalyst is simple and green in preparation method, and has the better degradation efficiency for pollutants in water, especially carbamazepine.