Soybean Sprout Biochar Persulfate Activation for Pollutant Degradation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing biochar materials used for activating persulfate in water treatment exhibit poor catalytic activity, require excessive modifiers leading to secondary pollution, and are susceptible to interference from halogen ions and natural organic matters.
Innovation Solution
A method involving the preparation of nutrient-enhanced soybean sprout-based biochar through sprouting, pyrolytic charring, and acid treatment to enhance catalytic activity, which activates persulfate for oxidative degradation of organic pollutants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If original biochar materials are used to activate persulfate, then the process is simple, but the catalytic activity is poor
Solution Approach 1:
The patent applies parameter changes by controlling the pyrolysis temperature (700-900°C) and duration (1-3 hours) to optimize the biochar's catalytic activity. The nutrient solution composition (Fe2+, Zn2+, I-) concentrations are also adjusted to achieve optimal catalytic performance, transforming the raw biochar into an enhanced catalyst with improved persulfate activation capability.
Solution Approach 2:
The patent creates a composite material by impregnating biochar with a nutrient solution containing multiple metal ions (Fe2+, Zn2+, I-). This composite structure combines the porous framework of biochar with catalytically active metal species, resulting in a material that exhibits both the structural advantages of biochar and the catalytic activity of metal-containing compounds for persulfate activation.
2Reliability
If biochar is modified by a large amount of modifiers to improve activity, then catalytic activity increases, but secondary pollution occurs
Solution Approach 1:
The patent uses inexpensive, naturally occurring substances (soybean sprouts, common salt, vinegar, water) as modifiers instead of expensive or hazardous chemical agents. These biodegradable modifiers enhance catalytic activity without introducing persistent pollutants, aligning with the principle of using cheap, environmentally benign materials that can be easily disposed of or degraded.
Solution Approach 2:
The patent optimizes the concentration of modifiers (NaCl: 5-15%, CH3COOH: 5-15%) to achieve the desired catalytic activity while minimizing the amount added. By carefully controlling these parameters, the patent enhances performance without excessive modification that would lead to secondary pollution.
3Ease of manufacture
If traditional treatment methods are used, then the technology is well-established, but the treatment efficiency is low and incomplete
Solution Approach 1:
The patent employs persulfate (S2O8 2-) as a strong oxidant that, when activated by the modified biochar, generates sulfate radicals with extremely high oxidizing power (E0 = 2.5-3.1 V). This accelerated oxidation capability enables complete degradation of recalcitrant organic pollutants that traditional methods cannot effectively treat, significantly improving treatment efficiency while maintaining operational simplicity.
Solution Approach 2:
The modified biochar acts as an intermediary catalyst that facilitates the activation of persulfate. It mediates between the persulfate and organic pollutants, generating reactive sulfate radicals that drive the oxidation process. This intermediary approach allows the system to achieve high efficiency without requiring complex equipment or additional energy input.
4Reliability
If metal-based activating agents are used, then persulfate activation is effective, but metal ion release causes secondary pollution
Solution Approach 1:
The modified biochar serves as an intermediary catalyst that enables persulfate activation without direct metal ion release into the water. The metal ions (Fe2+, Zn2+, I-) are bound within the biochar structure, where they facilitate electron transfer to activate persulfate, while the biochar matrix prevents their leaching into the treated water, thus eliminating metal pollution while maintaining activation effectiveness.
Solution Approach 2:
The biochar structure creates a protected environment for the metal ions, isolating them from direct contact with the water being treated. This inert matrix prevents metal ion release while still allowing the metal species to perform their catalytic function internally, effectively decoupling activation effectiveness from metal pollution.
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 method achieves high degradation efficiency of organic pollutants with cost-effectiveness and resistance to environmental interferences, utilizing non-radical pathways for oxidative degradation.
Implementation Method 1
Carbon-based materials have characteristics such as high specific surface area, excellent electron transport capacity, surface-regulatory functionalized functional groups, and sp2 hybridized carbon structure that can effectively participate in redox reactions
Implementation Method 2
Carbon-based materials have characteristics such as high specific surface area, excellent electron transport capacity
Implementation Method 3
At present, common treatment methods include adsorption, the Fenton method, the membrane separation method, the biodegradation method, etc.
Data Source
AI summary
A method for removing organic pollutants from water bodies by activating persulfate with nutrient-enhanced soybean sprout-based biochar involves a method for removing organic pollutants from water bodies by activating persulfate with biochar. The invention is intended to solve the technical problems that existing biochar materials show poor catalytic activity when used for activating persulfate and requires the addition of a large amount of modifiers, which easily leads to secondary pollution to the environment, and the existing biochar materials are susceptible to interference from halogen ions, oxoanions, and natural organic matters in a persulfate system. The raw material of a catalyst used in the invention is soybean, and has an activation process mainly based on non-radical activation, exhibiting high reaction rate and saving persulfate. With the addition of 0.2 g/L catalyst and 0.5 mM potassium persulfate, the degradation efficiency against 10 mg/L phenol can reach 100% within 10 min.