Granular Mesoporous Silica Adsorbent for Water Treatment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional water treatment systems using granular activated carbon are ineffective in removing new pollutants like heavy metals and endocrine disrupting chemicals, and powdered mesoporous silica adsorbents face issues with long-term efficiency and recovery due to small grain size and binder-induced pore occlusion.
Innovation Solution
A method for preparing granular mesoporous silica involves forming mesopores in powdered silica using a structure derivative, combining it with an inorganic or organic binder, and then calcinating to create a molded article with maintained pore characteristics, allowing for efficient pollutant removal and improved recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If powdered mesoporous silica is used as adsorbent, then adsorption property is improved, but treatment efficiency is lowered due to long-time exposure and difficulty in recovery
Solution Approach 1:
The invention divides the powdered silica into granular form by aggregating multiple fine particles into larger granules. This segmentation approach maintains the adsorption properties of individual particles while improving flow characteristics and reducing exposure time in treatment systems, thereby increasing overall treatment efficiency and facilitating easier recovery.
2Shape
If binder is used to granulize mesoporous silica, then granular form is achieved, but pores are occluded and porous characteristic is degraded
Solution Approach 1:
The invention extracts and removes the binder from the final granular product through calcination or other decomposition methods. This allows the granular shape to be formed during processing while eliminating the harmful binder that would otherwise occlude pores and degrade the mesoporous characteristics of the silica.
Solution Approach 2:
The binder is used temporarily during the granulation process to hold particles together, forming the desired granular shape. The binder serves its purpose during manufacturing and is then removed in a subsequent step, preventing pore occlusion in the final product while still enabling granular formation.
3Reliability
If powdered adsorbent is used, then adsorption capability is maintained, but adsorbent is lost during treatment process and recovery is difficult
Solution Approach 1:
By aggregating fine powdered particles into larger granules, the invention reduces the surface area available for loss during handling and treatment processes while maintaining the total adsorption capability. The granular form is less prone to being carried away with effluent or lost during filtration, significantly reducing adsorbent loss and facilitating easier recovery.
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 granular mesoporous silica maintains superior adsorption properties, prevents secondary pollution, and can be stably recovered, enhancing treatment efficiency and economic efficiency in water and air pollutant treatment processes.
Implementation Method 1
reacting the structure derivative to form the mesopores with the silica precursor in an acidic aqueous solution
Implementation Method 2
removing the structure derivative by calcinating the granular molded article
Implementation Method 3
the mesoporous silica has the regular porous structure, the large specific surface area, and the wide pore size... so the mesoporous silica is generally known as to be readily reproduced
Data Source
AI summary
Disclosed are granular mesoporous silica and a preparation method thereof. The preparation method includes preparing powdered silica containing a structure derivative to form mesopores; preparing a molded precursor including the powdered silica and an inorganic binder or an organic binder; preparing a granular molded article having a predetermined shape by extruding or injection-molding the molded precursor; and removing the structure derivative by calcinating the granular molded article. The granular mesoporous silica represents superior pore characteristics and is used as an adsorbent capable of effectively removing pollutants in water treatment and air pollution treatment.