CNT-grafted copolymer sorbent for phenol removal
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Solution Overview
Problem
Current methods for removing phenol from industrial wastewater are costly, inefficient, and often generate secondary pollutants and toxic sludge, highlighting the need for a cost-effective and environmentally friendly solution.
Innovation Solution
A nanocomposite sorbent is developed by grafting carbon nanotubes onto an acrylic acid/acrylamide copolymer, which is synthesized through a process involving mixing carbon nanotubes with acrylic acid and acrylamide, adding a polymerization initiator, and heating the mixture to form a dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional adsorption materials like activated carbon are used, then the process is simple and cost-effective, but the adsorption capacity is limited by surface area
Solution Approach 1:
The patent creates a composite material by grafting carbon nanotubes onto acrylic acid/acrylamide copolymer chains, combining the high surface area and adsorption capacity of CNTs with the functional groups of the copolymer. This composite structure achieves both high adsorption capacity and cost-effectiveness, resolving the contradiction between simple manufacturing and high performance.
Solution Approach 2:
The patent introduces functional groups (carboxyl from acrylic acid and amide from acrylamide) at specific locations along the polymer chains, creating localized high-affinity sites for phenol adsorption. This local functional enhancement allows the material to achieve high adsorption capacity without requiring extensive surface area modification throughout the entire structure.
2Quantity of substance
If high adsorption capacity is achieved through material design, then phenol removal effectiveness improves, but the complexity of material synthesis increases
Solution Approach 1:
The patent performs preliminary functionalization of carbon nanotubes by grafting them with acrylic acid and acrylamide monomers before final assembly into the adsorbent structure. This preliminary action creates pre-functionalized nanotubes that require simpler subsequent processing steps, reducing overall synthesis complexity while maintaining high adsorption capacity.
Solution Approach 2:
The acrylic acid/acrylamide copolymer acts as an intermediary that facilitates the integration of carbon nanotubes into the adsorbent structure. The copolymer chains serve as a bridging medium that connects individual CNTs, creating a stable composite material with enhanced adsorption capacity without requiring complex cross-linking or assembly procedures.
3Quantity of substance
If single-use adsorbents are employed to ensure high adsorption performance, then phenol removal efficiency is maximized, but the cost and waste generation increase
Solution Approach 1:
The patent designs the nanocomposite sorbent to be recoverable and reusable after adsorption cycles. The functional groups on the copolymer chains maintain their binding affinity for phenol even after multiple uses, allowing the material to be regenerated and reused without significant loss of adsorption capacity, thereby reducing waste generation and operational costs.
Solution Approach 2:
The nanocomposite sorbent exhibits self-regenerating properties where the functional groups (carboxyl and amide) can be regenerated through simple washing or elution processes without requiring complex regeneration equipment or chemicals. This self-service capability allows the material to maintain high adsorption efficiency across multiple cycles while minimizing waste and cost.
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 nanocomposite sorbent demonstrates enhanced phenol adsorption capacity, with reversible adsorption capabilities of 5 to 2500 μg of phenol per mg of sorbent, and retains 90 to 100% of its adsorption capacity after six cycles of adsorption-elution, making it a reusable and efficient solution for phenol removal.
Implementation Method 1
a method of removing an organic pollutant from water by adsorption using the nanocomposite sorbent
Implementation Method 2
adding a polymerization initiator to form a reaction mixture, heating the reaction mixture to a temperature of 25 to 100° C.
Data Source
AI summary
A method for producing a nanocomposite sorbent comprising carbon nanotube-grafted acrylic acid/acrylamide copolymer which involves copolymerization of acrylic acid and acrylamide in the presence of an aqueous dispersion of carbon nanotubes. The method yields a nanocomposite sorbent material having a reversible adsorption capacity phenol of 5 to 2500 μg of phenol per mg of nanocomposite sorbent. Also disclosed is a method for removing organic pollutants from water using the nanocomposite sorbent.