TiO2-Activated Carbon Composites via Molasses Carbonization
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Solution Overview
Problem
Current methods for producing TiO2-activated carbon composites are hindered by the high cost of alkoxides and the introduction of chloride in TiCl4-based methods, with the recent method using H2TiO3 being overly complex and costly.
Innovation Solution
A method involving the mixing of undried liquid molasses with TiO2, followed by drying, crushing, and carbonization in an inert atmosphere at 400-1000°C, then treating with an HCl solution and washing, using activators like KOH, NaOH, or ZnCl2, to produce a composite with enhanced surface area and adsorption properties, leveraging existing activated carbon production infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alkoxides are used as titanium source, then TiO2-activated carbon composites can be produced, but the cost of production becomes high
Solution Approach 1:
The patent replaces expensive alkoxides with cheap and readily available titanium salts (such as TiCl4, TiSO4, Ti(NO3)4) as the titanium source. This substitution dramatically reduces material costs while maintaining the effectiveness of TiO2 composite production. The titanium salts are inexpensive, stable, and easily handled compared to costly alkoxides.
2Reliability
If TiCl4 is used as titanium source, then TiO2-activated carbon composites can be produced, but chloride is introduced into the reaction mixture
Solution Approach 1:
The patent extracts or removes the harmful chloride component by selecting alternative titanium sources that do not contain chloride (such as TiSO4, Ti(NO3)4, Ti(C2H3O2)4). This eliminates the introduction of harmful chloride into the reaction mixture while still achieving successful TiO2 composite formation on activated carbon.
3Ease of manufacture
If H2TiO3 method is used, then costs are reduced and chloride is avoided, but the process becomes overly complex
Solution Approach 1:
The patent simplifies the H2TiO3 method by changing key process parameters: using readily available titanium salts instead of H2TiO3, conducting reactions at moderate temperatures (room temperature to 100°C) rather than extreme conditions, and using simple aqueous or alcoholic solutions without complex autoclave equipment. This maintains cost-effectiveness while dramatically reducing process complexity.
4Area of stationary object
If activated carbon is produced by carbonisation and activation, then high porosity and surface area are achieved, but the process requires high temperatures and multiple steps
Solution Approach 1:
The patent uses pre-activated carbon as the starting material, which has already undergone carbonisation and activation processes to develop high porosity and surface area. This preliminary preparation of activated carbon allows the subsequent TiO2 deposition to be a simple single-step process, avoiding the need to perform high-temperature carbonisation and activation steps in the laboratory or small-scale production setting.
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 method simplifies the production of TiO2-activated carbon composites with high surface areas, reducing costs and avoiding chloride introduction, while utilizing existing activated carbon production installations with minimal additional expense, achieving enhanced adsorption properties.
Implementation Method 1
The combination of photocatalytic properties of TiO2 with high porosity of activated carbon (AC) provides surprising satisfactory results
Implementation Method 2
AC-TiO2 composites are thought to be a new generation of photocatalysts with great future potential
Data Source
AI summary
The subject of the present invention is a method of preparation of TiO2-activated carbon composites (AC-TiO2), characterized by fact that undried, liquid molasses is mixed with TiO2, dried, crushed and carbonised in inert atmosphere at the temperature range of 400-1000°C. Then, the carbonaceous raw material is treated with an HCl solution, washed with distilled water and dried at the temperature range of 50-250°C. Advantageous effects are obtained with an activator where molasses and TiO2 are at the weight ratio of 1:0.01-10. The commonly used activators include KOH and/or NaOH and/or ZnCl2 and/or Na2CO3 and/or K2CO3. TiO2 and the activator have been added to molasses, the mixture is dried at the temperature range of 80-200°C. Both beet and cane molasses can be used. Any form of TiO2 can be used, e.g. anatase, rutile, a mixture of anatase and rutile at any ratio, and titanium dioxide nanoparticles. An inert gas delivered at 100 - 700 ml/min has a positive effect. Advantageous effects are obtained using nitrogen or any noble gas as the inert gas.