TiO2 Surface Modification via Titanate Transformation
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Solution Overview
Problem
Existing methods for surface modification of titanium dioxide and ceramic particles fail to effectively modulate photocatalytic activity and other surface characteristics, particularly for nano-sized particles, leading to undesirable decomposition of organic substrates or supports.
Innovation Solution
A process involving the use of a strong base to transform a titanium phosphate layer into a water-insoluble titanate, followed by acidification to form a gelatinous hydrate, and subsequent calcination to create a high surface area titanium oxide, which can be further treated with dopants to enhance specific properties such as photocatalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surface modification layer is applied to TiO2 particles to modulate photocatalytic activity, then the photocatalytic activity can be controlled to prevent decomposition of organic substrates, but the existing methods fail to effectively modulate the activity and maintain stability
Solution Approach 1:
The patent applies parameter changes by systematically varying the pH of the treatment solution (using strong base like KOH or strong acid like HCl) to control the surface modification process. By adjusting pH parameters, the process transforms the titanium phosphate layer into different forms (titanate, gelatinous hydrate) to achieve desired photocatalytic activity modulation while preventing harmful decomposition effects.
Solution Approach 2:
The patent uses an intermediary substance (strong base or strong acid) to mediate the transformation of the titanium phosphate surface layer. This intermediary facilitates the conversion into water-insoluble titanate or gelatinous hydrate, enabling effective photocatalytic activity modulation without direct harmful interactions with organic substrates.
2Ease of manufacture
If phosphate is added as an additive during calcination to create a titanium phosphate layer, then surface modification is achieved, but the photocatalytic activity cannot be effectively modulated and stability is compromised
Solution Approach 1:
The patent applies preliminary action by first forming a titanium phosphate layer on the TiO2 surface during calcination, then subsequently treating this layer with strong base or strong acid to transform it into the desired modification (titanate or gelatinous hydrate). This two-step preliminary action sequence enables effective photocatalytic activity control while maintaining manufacturing feasibility.
Solution Approach 2:
The patent uses parameter changes by introducing strong base (KOH) or strong acid (HCl) treatment steps that fundamentally alter the chemical composition and properties of the surface layer. These parameter changes enable precise control over photocatalytic activity while maintaining the ease of manufacture through straightforward chemical treatment processes.
3Productivity
If the TiO2 particles are made nano-sized to enhance surface area effects, then photocatalytic performance is improved, but the control over surface characteristics and stability becomes more difficult
Solution Approach 1:
The patent applies parameter changes by using strong base or strong acid treatments that universally affect nano-sized particles regardless of their specific size distribution. This approach maintains the enhanced photocatalytic performance of nano-particles while providing reliable control over surface characteristics through controlled chemical transformation of the surface layer.
Solution Approach 2:
The patent uses strong base or strong acid as intermediary substances that can effectively modify the surface of nano-sized TiO2 particles. These intermediaries provide reliable control over surface characteristics by transforming the titanium phosphate layer into titanate or gelatinous hydrate, thereby maintaining both high photocatalytic performance and surface characteristic control in nano-sized particles.
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 process results in titanium dioxide particles with adjustable photocatalytic activity and improved stability, effectively decomposing organic pollutants while protecting the support, as demonstrated by enhanced photocatalytic performance and electrochemical responses.
Implementation Method 1
The strong base reacts with the titanium phosphate surface layer and transforms it into a structure composed of a water insoluble titanate
Implementation Method 2
The product at this stage of the process may be dried and used as a titanium oxide with a high surface area. Alternatively, the dried product may be further calcined to make crystalline TiO2 in the anatase form
Implementation Method 3
The product at this stage of the process may be dried and used as a titanium oxide with a high surface area. Alternatively, the dried product may be further calcined to make crystalline TiO2 in the anatase form
Implementation Method 4
The method describes the use of additives to adjust the properties of the resulting TiO2 particles. These additives may appear as a surface modification on the TiO2 particles
Implementation Method 5
Anatase TiO2 is strongly photocatalytic. This photocatalytic effect may be desirable, for example, for the removal of organic pollutants
Data Source
AI summary
A method of preparing a surface modified ceramic material.