10.57647/ijrowa-y6fq-m572

Enhanced removal of Pb2+ from aqueous solutions by iron/manganese binary oxide loaded on Eichhornia crassipes stem biochar

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  • Nguyen Xuan Loc1,
  • Tran Tan Bao2,
  • Phan Thi Thanh Tuyen1,
  • Lang Hiep Phong2,
  • Do Thi My Phuong*2,
  1. Department of Environmental Science, College of the Environment and Natural Resources, Can Tho University, Can Tho 900000, Vietnam
  2. Department of Environmental Engineering, College of the Environment and Natural Resources, Can Tho University, Can Tho 900000, Vietnam
Enhanced removal of Pb2+ from aqueous solutions by iron/manganese binary oxide loaded on Eichhornia crassipes stem biochar

Received: 2024-01-30

Revised: 2024-04-05

Accepted: 2024-05-22

Published in Issue 2024-06-14

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

Loc, N. X., Bao, T. T., Tuyen, P. T. T., Phong, L. H., & Phuong, D. T. M. (2024). Enhanced removal of Pb2+ from aqueous solutions by iron/manganese binary oxide loaded on Eichhornia crassipes stem biochar. International Journal of Recycling of Organic Waste in Agriculture, 13(5). https://doi.org/10.57647/ijrowa-y6fq-m572
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Abstract

Purpose: Biochar modified with metal oxides has proved high capacities in removing heavy metals in wastewater. There is a limited number of studies exploring the potential of Fe-Mn binary oxides-biochar adsorbents for several heavy metals removal from contaminated water; however, the adsorption behavior and mechanism for Pb2+ ions adsorbed on Fe-Mn binary oxide/ Eichhornia crassipes stem biochar composite remains unclear.

Method: In this study, Eichhornia crassipes stem biochar (BC) was synthesized and loaded with iron/manganese binary oxide (Fe-Mn@BC) using iron sulfate and potassium permanganate.

Results: The successful coating of Fe-Mn oxide particles on the BC surface was confirmed through EDX and FT-IR spectra. Fe-Mn@BC exhibited a specific surface area 4.34 times higher than that of BC (SFe-Mn@BC = 69.636 m2/g; SBC = 16.03 m²/g), resulting in a maximum adsorption capacity for Pb2+ of 1164.95 mg/g, surpassing BC's capacity of 828.84 mg/g. The optimal conditions for Pb2+ removal by Fe-Mn@BC were an initial Pb2+ concentration of 50âmg/L, an adsorbent amount of 0.01âg, an adsorption time of 60âminutes, and an adsorption temperature of 313âK. The adsorption behavior of Pb2+ on Fe-Mn@BC was well-described by the pseudo second-order kinetic and Freundlich models. This process involved a heterogeneous multilayer mechanism that was both spontaneous and endothermic. The adsorption mechanism comprised intra-particle diffusion and chemisorption interactions, including co-precipitation, complexation, ion exchange, and hydrogen bonding.

Conclusion: Eichhornia crassipes stem biochar enhanced with iron/manganese binary oxide can efficiently remove Pb2+ from wastewater.

Research Highlights

  • The combination of Eichhornia crassipes stem biochar with iron/manganese binary oxide has been proposed as a viable solution, capitalizing on the respective strengths of both materials.
  • The specific surface area of Fe-Mn@BC increased by 4.34 folds.
  • The maximum adsorption capacity of Fe-Mn@BC for Pb2+ was 1164.95 mg/g, surpassing BC's capacity of 828.84 mg/g
  • The adsorption of Pb2+ on Fe-Mn@BC followed a heterogeneous multilayer process, characterized by spontaneity and endothermicity.
  • The iron/manganese binary oxide loaded on Eichhornia crassipes stem biochar demonstrated a higher Pb2+ adsorption capacity compared to its pristine biochar.

Keywords

  • Adsorption,
  • Biochar,
  • Eichhornia crassipes,
  • Fe/Mn binary oxide,
  • Pb2+
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