Date Pit Activated Carbon TiO2 Photocatalyst
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Solution Overview
Problem
There is a need for an economical and environmentally friendly photocatalyst that can efficiently adsorb and decompose organic molecules and environmental pollutants, particularly one that can be used in conjunction with TiO2 to enhance its photocatalytic capabilities.
Innovation Solution
A photocatalyst comprising TiO2 and activated carbon produced from date pits, where the activated carbon is created by treating date pits with an acidic aqueous solution and calcining them under controlled conditions, followed by impregnation with titanium dioxide to form an impregnated product for effective adsorption and decomposition of organic molecules and pollutants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional activated carbon materials (wood, coal, coconut shells) are used as substrates for TiO2 photocatalyst, then good adsorption performance is achieved, but high production cost and environmental concerns arise
Solution Approach 1:
The patent replaces expensive conventional activated carbon substrates with date pit waste material, which is abundant, low-cost, and environmentally benign. This substitution maintains adsorption functionality while eliminating the need for costly raw materials and reducing environmental harm from conventional carbon production
Solution Approach 2:
The invention utilizes date pits, an agricultural waste product that would otherwise be discarded, as the carbonaceous precursor for activated carbon. This transforms a waste stream into a valuable resource, eliminating the need for dedicated raw material extraction and reducing overall waste management costs
2Power
If TiO2 is used as photocatalyst, then photoactivity and redox reaction capability are achieved, but insufficient adsorption of organic molecules and pollutants occurs
Solution Approach 1:
The patent creates a composite material combining TiO2 photocatalyst particles with activated carbon derived from date pits. The activated carbon provides extensive adsorption surfaces for organic molecules and pollutants, while TiO2 particles dispersed on this substrate provide photoactivity and redox capabilities. This composite structure synergistically combines the complementary strengths of both materials
Solution Approach 2:
The activated carbon substrate possesses a highly porous structure with large surface area, which enhances the adsorption capacity for organic molecules and pollutants. This porous framework provides numerous active sites for pollutant accumulation, thereby improving the overall adsorption performance of the photocatalyst system
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 photocatalyst exhibits comparable activity to conventional activated carbon, offering an economical and environmentally safe solution for pollutant adsorption and decomposition, with enhanced affinity for organic molecules like alkanes and phenols, and demonstrates efficient performance in various photocatalytic reactions.
Implementation Method 1
Photocatalysis relates to the phenomenon of transforming light energy into chemical energy. TiO2, as a photo-active material, can therefore, efficiently utilize energy from sunlight and transcend in photocatalyzing chemical reactions. Absorption of a photon by a TiO2 crystal enables excitation of an electron (e−) from the valence band to the conduction band if the photon energy, hν, equals or exceeds the band gap energy of TiO2.
Implementation Method 2
Absorption of a photon by a TiO2 crystal enables excitation of an electron (e−) from the valence band to the conduction band if the photon energy, hν, equals or exceeds the band gap energy of TiO2. Simultaneously, an electron vacancy or a positively charged hole (h+) is generated in the valence band
Implementation Method 3
The activated carbon can have a porous surface that is particularly useful for attracting and holding pollutants flowing in air or water
Implementation Method 4
calcining the treated date pits under conditions to cause the treated date pits to thermally decompose and form activated carbon
Data Source
AI summary
A photocatalyst is provided that comprises activated carbon produced from date pits, impregnated with TiO2. The activated carbon can have a porous surface that can attract and trap pollutants flowing in air or water. The photocatalyst can be made by a method that includes preparing activated carbon by calcining date pits to form a precursor material, and then impregnating the precursor material with titanium dioxide.