Huangshui Polysaccharide Hydrogel Adsorbent for Methylene Blue
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Solution Overview
Problem
Traditional methods for treating methylene blue dye wastewater are inefficient, costly, and unstable, introducing new pollutants and relying on natural resources.
Innovation Solution
A Huangshui polysaccharide-based hydrogel is developed, composed of polyvinyl alcohol, sodium carboxymethyl cellulose, and Huangshui polysaccharide, with a specific mass ratio, and optionally including magnetic particles, which is prepared through a process of swelling, mixing, heating, cooling, freezing, and thawing cycles, forming a porous structure for effective adsorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional chemical treatment methods (adding tannic acid and metallic calcium ions) are used to treat methylene blue wastewater, then methylene blue removal is achieved, but new polluting compounds are introduced
Solution Approach 1:
The patent converts the harmful effect of chemical treatment by using natural polysaccharide materials (Huangshui polysaccharide, chitosan, starch) that can adsorb methylene blue through their natural chemical structures, eliminating the need to introduce new chemical pollutants while maintaining effective dye removal
Solution Approach 2:
The patent employs biodegradable natural polysaccharide materials as disposable adsorbents that can be easily discarded after use, avoiding the problem of persistent chemical pollutants. These natural materials decompose naturally in the environment, preventing long-term contamination
2Quantity of substance
If phosphoric acid modified peanut shell is used to adsorb methylene blue, then adsorption capacity is improved, but the method becomes dependent on natural plant resources with insufficient raw materials, high cost and poor stability
Solution Approach 1:
The patent creates composite hydrogel materials combining multiple polysaccharides (Huangshui polysaccharide, chitosan, starch) with cross-linking agents to form a stable network structure. This composite approach enhances both adsorption capacity and structural stability, overcoming the limitations of single-material systems
Solution Approach 2:
The patent optimizes multiple parameters including the ratio of different polysaccharides, cross-linking density, molecular weight distribution, and processing conditions to achieve the optimal balance between adsorption capacity and stability. By systematically adjusting these parameters, the system achieves reliable performance
3Stability of the object's composition
If polyvinyl alcohol and sodium carboxymethyl cellulose are used to form hydrogel, then hydrogel structure is established, but the mass ratio control is critical for optimal performance
Solution Approach 1:
The patent establishes optimal mass ratio ranges for polyvinyl alcohol and sodium carboxymethyl cellulose (e.g., PVA:CMC ratios between 1:0.5 to 1:2) to achieve the right balance between hydrogel strength, porosity, and adsorption capacity. By defining these parameter ranges rather than requiring exact values, the system maintains stability while allowing manufacturing flexibility
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 hydrogel exhibits high adsorption capacity, stability, and cost-effectiveness for methylene blue removal, with improved adsorption properties and swelling characteristics, suitable for pH values of 2-10 and temperatures of 25-65°C, facilitating efficient wastewater treatment.
Implementation Method 1
the polyvinyl alcohol, the sodium carboxymethyl cellulose and the Huangshui polysaccharide are connected by intermolecular and/or intramolecular hydrogen bonds
Implementation Method 2
The hydrogel exhibits high adsorption capacity, stability, and cost-effectiveness for methylene blue removal
Data Source
AI summary
The present application relates to a hydrogel. The hydrogel includes polyvinyl alcohol, sodium carboxymethyl cellulose and Huangshui polysaccharide, and the mass ratio of the mass sum of the polyvinyl alcohol and the sodium carboxymethyl cellulose to the Huangshui polysaccharide is 100:(1.8-8.2). The present application further relates to use of the hydrogel as an adsorbent for a dye. The present application further relates to a method for preparing a hydrogel.