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Effect of MgCl2 Loading on the Yield and Performance of Cabbage-Based Biochar
Cui Zhu1,2, Kuncheng Huang1,3, Mengyuan Xue4
1School of Mechanical Engineering, Hefei University of Technology, Hefei 230009, China.
Bioengineering (Basel, Switzerland)
|July 29, 2023
Summary
Adding magnesium (Mg) to biomass-activated carbon enhances its properties. This process boosts biochar yield and fixed carbon production, improving carbon capture and pollutant adsorption.
Area of Science:
- Biomass conversion and carbon materials science.
- Catalytic pyrolysis and nanomaterial applications.
- Environmental remediation and carbon sequestration.
Background:
- Converting photosynthetically absorbed carbon dioxide (CO2) into biomass-activated carbon is a key strategy for reducing carbon emissions.
- Nanoparticle-loaded activated carbon offers potential for enhanced material properties and catalytic activity.
- Understanding the impact of dopant loading on pyrolysis and material characteristics is crucial for optimizing activated carbon production.
Purpose of the Study:
- To investigate the effect of magnesium (Mg) loading on the catalytic pyrolysis of biomass for activated carbon production.
- To assess the influence of Mg loading on biochar yield, fixed carbon content, and material properties.
- To evaluate the performance of Mg-loaded activated carbon in adsorbing various pollutants.
Main Methods:
- One-step preparation of biomass-activated carbon loaded with magnesium oxide (MgO) nanoparticles.
- Analysis of chemical structure changes (e.g., C=O, C-H signals) and reaction inhibition (dehydroxylation, substituent breakage) using spectroscopic techniques.
- Characterization of morphological features, porosity (mesoporosity), biochar yield, and fixed carbon yield.
- Assessment of activated carbon adsorption capacity for potassium dichromate, acid magenta, methylene blue, and tetracycline.
Main Results:
- 1% Mg loading altered chemical bonds, inhibited dehydroxylation, and strengthened C-H signals, while MgO formation hindered weaker bond breakage.
- Magnesium addition modified the biochar's morphology and chemical composition.
- Activated carbon mesoporosity increased by 3.94%, biochar yield by 5.55%, and fixed carbon yield by 12.14%.
- The adsorption capacity for potassium dichromate, acid magenta, methylene blue, and tetracycline increased by 8.71, 37.15, 117.68, and 3.53 mg, respectively.
Conclusions:
- Magnesium chloride (MgCl2) significantly promotes biomass thermal degradation during catalytic pyrolysis.
- Mg loading enhances the solid yield and fixed carbon content of the resulting activated carbon.
- The prepared Mg-loaded activated carbon exhibits improved adsorption performance for diverse effluents, indicating its potential for environmental applications.
