Dimercaptosuccinic acid modified lignin rich biochar-hydroxyapatite composite for selective and efficient mercury adsorption: Mechanistic and RSM modeling approach
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View abstract on PubMed
Summary
This summary is machine-generated.This study developed a novel biochar composite from industrial hemp for effective mercury removal from water. The HAPs@HS-HHB-SH composite demonstrated high efficiency and stability for wastewater treatment.
Area Of Science
- Materials Science
- Environmental Chemistry
- Chemical Engineering
Background
- Industrial hemp stalks (Cannabis sativa) are an underutilized agricultural residue.
- Lignin-rich hemp hurd biochar (HHB) offers potential for functionalization.
- Mercury (Hg(II)) contamination poses significant environmental and health risks.
Purpose Of The Study
- To synthesize and characterize a novel dithiol-modified biochar composite for mercury ion adsorption.
- To investigate the adsorption performance and mechanism of the composite for Hg(II) removal.
- To evaluate the stability and reusability of the adsorbent for practical wastewater treatment.
Main Methods
- Hemp hurd biochar (HHB) was functionalized with dimercaptosuccinic acid (DMSA) to create dithiol-modified biochar (HS-HHB-SH).
- Hydroxyapatite (HAPs) was grown on HS-HHB-SH to form the HAPs@HS-HHB-SH composite.
- Characterization was performed using FTIR, XRD, FESEM, BET, and TGA.
- Adsorption experiments were optimized using Box-Behnken Response Surface Methodology (RSM-BBD).
Main Results
- The HAPs@HS-HHB-SH composite exhibited an outstanding distribution coefficient (KD) of 2 × 10<sup>6</sup> mg L<sup>-1</sup> for Hg(II) ions.
- Optimized conditions achieved 99.8% Hg(II) removal within 9 minutes.
- Adsorption followed pseudo-second-order kinetics and Langmuir isotherm model with a maximum capacity of 769.23 mg g<sup>-1</sup>.
- The adsorbent retained 84% efficiency after seven reuse cycles.
Conclusions
- The synthesized HAPs@HS-HHB-SH composite is a highly effective and stable adsorbent for mercury removal.
- The material shows significant potential for practical applications in wastewater treatment.
- The study highlights the value of agricultural residues in developing advanced materials for environmental remediation.
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