Modified Cyclodextrin Mesoporous Silica Adsorbent for Heavy Metal Removal
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Solution Overview
Problem
Traditional adsorbent materials for heavy metal ion removal from industrial wastewater face challenges such as long adsorption times, low adsorption rates, poor selectivity, complex preparation processes, and high costs, which hinder effective pollution control.
Innovation Solution
A modified cyclodextrin/mesoporous silica adsorbent material is developed through a simple and controllable preparation method involving chloroacetic acid modification, enabling rapid and selective adsorption of Pb and Cd ions, with a high adsorption efficiency and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional adsorbent materials are used for heavy metal ion removal, then the adsorption process can be performed, but the adsorption time is long and the adsorption rate is low
Solution Approach 1:
The patent employs mesoporous silica with controlled pore structures to increase the surface area and porosity of the adsorbent material. This porous structure provides more active sites for heavy metal ion adsorption and facilitates faster mass transfer, thereby significantly improving the adsorption rate and reducing the time required to reach adsorption equilibrium.
Solution Approach 2:
The patent creates a composite material by grafting modified cyclodextrin onto mesoporous silica. This composite structure combines the high surface area and porosity of mesoporous silica with the selective binding capability of cyclodextrin, achieving both rapid adsorption kinetics and high removal efficiency for heavy metal ions.
2Reliability
If traditional adsorbent materials are used, then adsorption can occur, but the adsorption effect and selectivity are poor
Solution Approach 1:
The patent introduces specific functional groups (carboxymethyl groups from chloroacetic acid modification and hydroxyl groups from cyclodextrin) at specific locations on the silica surface. These localized functional groups provide specific binding sites that enhance the adsorption effect and selectivity for heavy metal ions through coordinated interactions.
Solution Approach 2:
The patent modifies the chemical parameters of the adsorbent surface by controlling the pH during chloroacetic acid grafting and adjusting the composition ratios of reactants. These parameter changes optimize the surface charge, functional group density, and binding affinity, thereby improving both the overall adsorption effect and the selectivity for Pb and Cd ions.
3Ease of manufacture
If traditional modified cyclodextrins are prepared, then the material can be obtained, but the preparation process is complicated and the cost is high
Solution Approach 1:
The patent divides the preparation process into distinct sequential steps: first preparing mesoporous silica, then grafting chloroacetic acid, and finally modifying with cyclodextrin. This segmentation of the synthesis process makes each step more manageable, simplifies the overall preparation procedure, and improves reproducibility while reducing complexity.
Solution Approach 2:
The patent uses chloroacetic acid as an intermediary compound in the grafting process. The chloroacetic acid first reacts with the silica surface to form a stable intermediate structure, which then serves as the attachment point for cyclodextrin. This intermediary approach simplifies the overall modification process compared to direct grafting methods.
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 cyclodextrin/mesoporous silica adsorbent achieves a maximum removal rate of 97.8% for Pb and 81.29% for Cd, offering a cost-effective and scalable solution for heavy metal ion pollution in wastewater treatment.
Implementation Method 1
The modified cyclodextrin/mesoporous silica prepared by the disclosure is simple and accessible, can realize rapid adsorption in a short time, has good selectivity for Pb and Cd
Data Source
AI summary
The disclosure provides a modified cyclodextrin/mesoporous silica for adsorbing Pb and Cd and application thereof, belonging to the technical field of adsorbent materials. By using surface modification, chloroacetic acid is used as anions, and a modified cyclodextrin is grafted onto a surface of a cyclodextrin/mesoporous silica by nucleophilic substitution to prepare the modified cyclodextrin/mesoporous silica adsorbent material. The modified cyclodextrin/mesoporous silica adsorbent material prepared in the disclosure has the advantages of simple preparation method, strong adsorbability, easy separation, good biocompatibility and the like. When the material is used as an adsorbent to adsorb heavy metal ions Pb2+ and Cd2+, maximum removal rates can reach 97.8% and 81.29% respectively. Therefore, the material has wide application prospects in removal of heavy metals in sewage and the like, thereby improving the water environment that people depend on for survival.