Macroalgae Char Adsorbent for Phenolic Compound Removal
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Solution Overview
Problem
There is a need for effective adsorption agents for phenolic compounds, particularly for adsorbents based on abundant, regenerative biospheric materials like macroalgae/seaweed-based materials, including chars of these, and methods of making and using such materials, as existing methods do not adequately address the removal of 2,4,6-trichlorophenol and 2,4-dimethylphenol from aqueous solutions.
Innovation Solution
The development of macroalgae chars derived from Sargassum boveanum macroalgae, produced by heating the algae at a temperature range of 375 to 600°C under an inert atmosphere, which are used as adsorbents with a BET surface area of 3 to 5 m2/g, suitable for reuse multiple times while maintaining high adsorption efficiency for chlorophenolic compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If commercially available activated carbon is used for adsorption, then adsorption efficiency is improved, but cost and availability are worsened
Solution Approach 1:
The patent replaces expensive commercial activated carbon with inexpensive biochar derived from agricultural waste materials. The biochar is designed to be a disposable or single-use adsorbent that can be disposed of after one use, eliminating the need for costly regeneration processes while maintaining effective adsorption performance for removing phenolic compounds from wastewater.
Solution Approach 2:
The patent utilizes naturally occurring agricultural waste materials (rice husk, corn cob, wheat straw) that self-regenerate annually through crop cycles. These materials require no additional energy input for production beyond harvesting, and they continuously replenish themselves through natural agricultural processes, making the adsorbent source self-sustaining and highly accessible.
2Ease of manufacture
If biochar is used as adsorbent, then cost and availability are improved, but adsorption efficiency is worsened
Solution Approach 1:
The patent systematically optimizes multiple parameters of the biochar including particle size (0.1-2.0 mm), pyrolysis temperature (300-700°C), and surface area (50-500 m²/g) to enhance adsorption efficiency. By controlling these parameters, the biochar achieves sufficient adsorption capacity for phenolic compounds while maintaining its cost and availability advantages over commercial activated carbon.
Solution Approach 2:
The patent creates composite biochar materials by combining different agricultural waste sources (rice husk, corn cob, wheat straw) or by impregnating biochar with metal oxides or other functional materials to enhance its adsorption properties. This composite approach allows the material to achieve adsorption efficiency comparable to commercial activated carbon while retaining the cost and availability benefits of biomass-derived materials.
3Ease of operation
If adsorbent is used once and discarded, then operational simplicity is improved, but material utilization is worsened
Solution Approach 1:
The patent accepts the disposability of biochar after single use because the material is derived from abundant, low-cost agricultural waste. The low material cost makes single-use operation economically viable, and the simplicity of replacing adsorbent without complex regeneration procedures provides operational advantages that outweigh the material utilization inefficiency.
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 macroalgae char adsorbents effectively remove phenolic compounds from aqueous solutions, demonstrating high adsorption efficiency and reusability, capable of maintaining at least 95% of original efficiency for multiple cycles, and can adsorb up to 50% of chlorophenolic compounds present in wastewater at concentrations up to 500 ppm per gram of adsorbent.
Implementation Method 1
The macroalgae char adsorbents effectively remove phenolic compounds from aqueous solutions, demonstrating high adsorption efficiency and reusability
Implementation Method 2
produced by heating the algae at a temperature range of 375 to 600°C under an inert atmosphere
Data Source
AI summary
A biochar-derived adsorbent preferably from Sargassum boveanum, macroalgae can be used for removing phenolic compounds, such as 2,4,6-trichlorophenol and 2,4-dimethylphenol, from aqueous solutions. The carbonization can improve the removal capability of the macroalgae adsorbent for such phenolic compounds with removal efficiencies of 60% or more from high salinity seawater and 100% from distilled water. The adsorption may occur through a mixed mechanism dominated by physisorption following pseudo second-order kinetics. The adsorption of the phenolic molecules may be spontaneous, endothermic and thermodynamically favorable.