Titanium Sol Additive for Cement Carbon Sequestration
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Solution Overview
Problem
Cement-based materials face challenges in carbon sequestration, including carbonation-induced shrinkage, cracking, and reduced toughness, while existing methods for enhancing carbonation do not effectively control surface carbonation depth and maintain material performance.
Innovation Solution
A titanium sol carbon sequestration additive is prepared by mixing titanium tetraisopropanolate with an ammonia aqueous solution, followed by hydrolysis and drying to form titanium dioxide powder, which is then mixed with sodium polyacrylate and methyldiethanolamine, and subsequently coated onto cement-based materials to enhance CO2 absorption and carbon sequestration, controlling surface carbonation and maintaining material performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If continuous carbonation is applied to cement-based materials to achieve CO2 sequestration, then CO2 absorption capacity is improved, but material toughness and structural integrity deteriorate due to shrinkage and cracking
Solution Approach 1:
The patent applies local quality by creating a gradient carbonation structure where the surface layer has different properties than the interior. The surface is treated with titanium sol to enable controlled carbonation, while the bulk material maintains its original toughness. This spatial differentiation allows CO2 sequestration at the surface without compromising the overall structural integrity of the cement-based material.
Solution Approach 2:
The patent employs preliminary action by pre-treating the cement-based material surface with titanium sol before carbonation. This preliminary treatment creates a protective layer that controls the carbonation process, preventing the harmful shrinkage and cracking that would otherwise occur during subsequent CO2 exposure. The titanium sol modification prepares the surface to undergo carbonation in a controlled manner.
2Productivity
If surface carbonation is enhanced to increase CO2 sequestration rate, then carbonation depth control becomes difficult, but material performance is maintained
Solution Approach 1:
The patent implements feedback control through the titanium sol layer, which responds to CO2 concentration gradients and regulates carbonation progression. The titanium sol-modified surface provides a self-regulating mechanism that maintains optimal carbonation depth by adjusting the carbonation rate based on the concentration differential between the surface and interior, thereby achieving both high productivity and precise depth control.
Solution Approach 2:
The titanium sol acts as an intermediary layer between the external CO2 environment and the cement-based material interior. This intermediate layer mediates the carbonation process by controlling CO2 diffusion and reaction rates, enabling enhanced carbonation productivity while maintaining precise depth control. The titanium sol modifies the surface properties to facilitate controlled CO2 uptake without allowing uncontrolled penetration into the bulk material.
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 titanium sol carbon sequestration additive significantly increases CO2 absorption and carbon sequestration rates, improves the compactness and structure of cement-based materials, and maintains material performance by controlling surface carbonation depth and preventing volume shrinkage, thus addressing the challenges of carbonation-induced issues.
Implementation Method 1
mixing titanium tetraisopropanolate with an ammonia aqueous solution to obtain a first mixture, subjecting the first mixture to hydrolysis to obtain a hydrolysis solution
Implementation Method 2
the titanium sol carbon sequestration additive makes it possible to absorb CO2 to a greater extent and at a higher rate
Data Source
AI summary
Provided are a titanium sol carbon sequestration additive and a preparation method and use thereof, and a method for carbon sequestration of a cement-based material. The method for preparing the titanium sol carbon sequestration additive includes: mixing titanium tetraisopropanolate with an ammonia aqueous solution to obtain a first mixture, subjecting the first mixture to hydrolysis to obtain a hydrolysis solution, and drying the hydrolysis solution to obtain a titanium dioxide powder; mixing the titanium dioxide powder with sodium polyacrylate and a methyldiethanolamine (MDEA) aqueous solution to obtain a second mixture, and subjecting the second mixture to amination to obtain a solution A; mixing water with ethanol to obtain a solution B; and mixing the solution A and the solution B with a catalyst to obtain a mixed solution, and subjecting the mixed solution to solation to obtain the titanium sol carbon sequestration additive.