Modified Aluminosilicate Mesoporous Material for Water Pollutant Adsorption
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Solution Overview
Problem
Natural aluminosilicate materials face limitations such as high impurity content, narrow pore channels, small specific surface area, and complex modification processes, which hinder effective adsorption of macromolecular pollutants like ammonia nitrogen and phosphorus, and are difficult to scale up for large-scale water treatment.
Innovation Solution
A method involving crushing and screening aluminosilicate particles, soaking in a nitrate solution followed by calcination, and then treating with an alkaline chitosan solution to create a modified aluminosilicate inorganic mesoporous material with controlled pore channels and increased specific surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural aluminosilicate is used directly, then the material is cheap and readily available, but the adsorption efficiency is reduced due to high impurity content and narrow pore channels
Solution Approach 1:
The patent applies parameter changes by treating aluminosilicate with nitrate solution followed by calcination at 400-500°C for 1-2 hours. This thermal treatment modifies the material's pore structure and surface properties, expanding pore channels and removing impurities, thereby significantly improving adsorption efficiency for ammonia nitrogen and phosphorus while maintaining cost-effectiveness
Solution Approach 2:
The patent creates a composite material by combining aluminosilicate with chitosan coating. The chitosan layer is applied after calcination treatment, forming a composite structure that enhances adsorption capacity for macromolecular pollutants while the underlying aluminosilicate provides structural stability and porosity
2Reliability
If the pore channel size of natural aluminosilicate is narrow, then the material structure is simple, but the adsorption capacity for macromolecular pollutants is limited
Solution Approach 1:
The calcination process at 400-500°C causes structural reorganization of the aluminosilicate framework, expanding the pore channels from narrow natural dimensions to larger mesoporous structures. This parameter change in pore size enables effective diffusion and adsorption of macromolecular pollutants like ammonia nitrogen and phosphorus
3Reliability
If the specific surface area of aluminosilicate is small, then the material is compact, but the number of adsorption sites is limited
Solution Approach 1:
The thermal calcination treatment induces formation of a mesoporous structure with significantly increased specific surface area. The controlled heating process creates numerous pores and surface defects that serve as additional adsorption sites, transforming the compact natural structure into a high-surface-area porous material capable of treating large-scale water bodies
4Reliability
If complex modification methods are used to improve adsorption performance, then the adsorption efficiency increases, but the process complexity and production cost increase
Solution Approach 1:
The patent employs a straightforward two-step modification process: (1) soaking in nitrate solution followed by calcination at 400-500°C, and (2) coating with chitosan solution. These parameter-based treatments achieve efficient adsorption enhancement without requiring complex equipment or multi-stage processes, making the method suitable for large-scale production and promotion
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 modified material achieves high adsorption efficiency for ammonia nitrogen and phosphorus, with removal rates exceeding 90% across various concentrations, and avoids secondary pollution by omitting water washing steps.
Implementation Method 1
performing calcination at 400° C. to 500° C. for 1 h to 2 h
Implementation Method 2
enhancing the adsorption capacity of aluminosilicate for ammonia nitrogen and phosphorus
Data Source
AI summary
The disclosure relates to a modified aluminosilicate inorganic mesoporous material and a preparation method therefor. Through calcination modification of nitrate and modification of alkaline chitosan, and through the regulation of parameters such as a particle size and a specific surface area of the aluminosilicate, a concentration of a nitrate solution, a solid-to-liquid ratio of aluminosilicate particles to the nitrate solution, a calcination time, a calcination temperature, and a pH value, a mass fraction and a temperature of the chitosan solution, the modified aluminosilicate inorganic mesoporous material with a stable specific surface area ranging from 30 m2/g to 40 m2/g can be stably prepared. Moreover, the size of a pore channel inside the mesoporous material can be as small as sub-nanometer scale.