Composite materials based on biochar from coffee husk origin and nano zero-valent type Fe/Cu: Potential for treatment of water sources contaminated with As(V) Scientific paper

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Published: Feb 12, 2026
Updated: 12.02.2026
DOI: https://doi.org/10.2298/JSC250205033V
Keywords:
bimetallic nanoparticles water contaminated

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Ngoc Toan Vu
Institute of New Technology, 17, Hoang Sam, Nghia Do, Cau Giay, Hanoi, Vietnam
Anh Phu Nguyen
Military Technical Academy, 236, Hoang Quoc Viet, Bac Tu Liem, Hanoi, Vietnam
https://orcid.org/0009-0005-2636-3197
Hong Son Nguyen
The Institute of New Technology, 17 Hoang Sam, Nghia Do, Cau Giay, Ha Noi, Vietnam
https://orcid.org/0009-0002-3882-7161
Viet Anh Pham
Institute of New Technology, 17, Hoang Sam, Nghia Do, Cau Giay, Hanoi, Vietnam
https://orcid.org/0009-0000-8730-9809
Dinh Thao Vu
Military Technical Academy, 236, Hoang Quoc Viet, Bac Tu Liem, Hanoi, Vietnam
https://orcid.org/0000-0002-8952-2897
Quang Minh Le
Hanoi–Amsterdam High School for the Gifted, 1, Hoang Minh Giam, Trung Hoa, Cau Giay, Hanoi, Vietnam
https://orcid.org/0009-0001-3940-9984

Abstract

In this study, a composite material, Gr–Fe/Cu@BC (CPS), was syn­thesized using biochar derived from coffee husks and Fe/Cu bimetallic zero-val­ent nanoparticles for the treatment of water contaminated with As(V). The Fe/Cu bimetallic zero-valent nanoparticles were synthesized via a green chemical method employing concentrated Camellia sinensis extract as a reducing agent for metal salts. A Box–Behnken experimental design identified optimal con­ditions for As(V) removal, including a pH range of 5–7, metal/C ratio of approx.­imately 12–13 %, CPS/As mass ratio from 1000 to 1250 and reaction time of around 180 min. The maximum As(V) removal efficiency reached 91.64 % with a maximum adsorption capacity (qmax) of 2.86 mg g-1. The adsorption kinetics of As(V) on CPS followed a pseudo-second-order model, with a rate constant (K2) of 5.96 g mg-1 h-1. Furthermore, the structural and surface properties of CPS were characterized using advanced analytical techniques such as SEM, TEM, BET, XRD and EDS, confirming the successful integration of Fe/Cu nanopar­ticles onto the biochar matrix via complexation bonds. These findings highlight the potential of CPS as an environmentally friendly, cost-effective material for the treatment of As(V)-contaminated water and other heavy metal pollutants.

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[1]
N. T. Vu, A. P. Nguyen, H. S. Nguyen, V. A. Pham, D. T. Vu, and Q. M. Le, “Composite materials based on biochar from coffee husk origin and nano zero-valent type Fe/Cu: Potential for treatment of water sources contaminated with As(V): Scientific paper”, J. Serb. Chem. Soc., vol. 91, no. 2, pp. 195–212, Feb. 2026.
Issue
Vol. 91 No. 2 (2026)
Section
Environmental Chemistry
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