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[Adsorption Performance of Walnut Green Husk Biochar for Heavy Metals]
Xiao-Li Zhu1, Yan-Ping Cheng1, Ye-Hua Shen2
1College of Urban and Environmental Science, Northwest University, Xi'an 710127, China.
Huan Jing Ke Xue= Huanjing Kexue
|October 12, 2023
Summary
Walnut green husk biochar, particularly WP500, effectively removes heavy metals like lead (Pb2+), copper (Cu2+), and cadmium (Cd2+) from water. Optimal removal occurs at pH 8, showcasing biochar
Area of Science:
- Environmental Chemistry
- Materials Science
- Waste Management
Context:
- Heavy metal contamination in aqueous solutions poses significant environmental and health risks.
- Developing sustainable adsorbents from waste materials is crucial for effective remediation.
- Walnut green husk is an abundant agricultural waste with potential for valorization.
Purpose:
- To synthesize and characterize biochars from walnut green husk for heavy metal removal.
- To evaluate the adsorption performance of different biochars (WP300, WP500, WP700) for Pb2+, Cu2+, and Cd2+.
- To determine optimal adsorption conditions, including pH and biochar dosage, and elucidate removal mechanisms.
Summary:
- Biochar WP500, produced at 500°C, demonstrated superior adsorption of Pb2+, Cu2+, and Cd2+ from aqueous solutions.
- Highest removal efficiencies (Pb2+: 97.87%, Cu2+: 99.78%, Cd2+: 71.15%) were achieved at pH 8.
- Adsorption mechanisms involve pore-filling, electrostatic attraction, ion-exchange, mineral precipitation, complexation, and π-π interactions, indicating chemical adsorption.
Impact:
- This study highlights the potential of waste walnut green husk biochar as an effective and sustainable adsorbent for heavy metal remediation.
- Provides insights into optimizing biochar production and application for wastewater treatment.
- Offers a novel approach for the resource utilization of agricultural waste.
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