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Transforming tire-derived char into powerful arsenic adsorbents by mild modification
Yunnen Chen1, Jiali Xu2, Yuting Li2
1Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Jiangxi University of Science and Technology, No. 156 Kejia Ave, Ganzhou, 341000, Jiangxi, People's Republic of China. cyn70yellow@126.com.
This study developed a novel adsorbent from modified tire-derived char (TC) for effective arsenic (As(V)) removal from industrial wastewater. The new Fe(OH)3-TCNaOH adsorbent efficiently removes arsenic under various conditions, offering a sustainable solution.
Area of Science:
- Environmental Science
- Materials Science
- Chemistry
Background:
- Industrial wastewater from non-ferrous metal industries contains significant amounts of arsenic, posing environmental risks.
- Tire-derived char (TC) is a potential adsorbent but requires surface modification for effective arsenic removal due to tar/ash adhesion.
- Existing TC modification methods often involve high-temperature activation, necessitating alternative approaches.
Purpose of the Study:
- To develop and characterize a modified TC adsorbent for efficient removal of pentavalent arsenic (As(V)) from wastewater.
- To investigate the adsorption performance and mechanism of the modified adsorbent under various conditions.
- To evaluate the impact of coexisting ions on arsenic removal efficiency.
Main Methods:
- Modification of tire-derived char (TC) using NaOH and iron(III) hydroxide (Fe(OH)3) at room temperature and in an air atmosphere.
- Characterization of the Fe(OH)3-TCNaOH adsorbent, focusing on particle size (61-75 μm) and surface properties.
- Batch adsorption experiments to determine As(V) removal rates, optimal pH range, and the effect of coexisting phosphate ions (PO43-).
Main Results:
- The Fe(OH)3-TCNaOH adsorbent achieved over 90% As(V) removal within 30 minutes at an initial concentration of 5 mg/L and a wide pH range (3-9).
- Phosphate ions significantly impacted As(V) adsorption, reducing the removal rate by approximately 20%.
- Adsorption mechanism involves an increase in mesoporous pores (3-5 nm) and the formation of hydrogen bonds, enhancing As(V) uptake and Fe-As complex stability.
Conclusions:
- Fe(OH)3-TCNaOH is an effective adsorbent for removing As(V) from wastewater, offering good performance under ambient conditions.
- The room-temperature modification method provides a potentially more accessible and energy-efficient route for producing effective arsenic adsorbents.
- Understanding the influence of coexisting ions and adsorption mechanisms is crucial for optimizing real-world applications.
