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. 2023 Nov 28;13(1):20937.
doi: 10.1038/s41598-023-46815-4.

Preparation and adsorption properties of magnetic chitosan/sludge biochar composites for removal of Cu2+ ions

Meng Zhang  1 , Yunqing Liu  2 , Zhizhen Yin  3 , Dan Feng  1 , Hui Lv  1
Affiliations

Preparation and adsorption properties of magnetic chitosan/sludge biochar composites for removal of Cu2+ ions

Meng Zhang et al. Sci Rep. .

Abstract

The magnetic chitosan/sludge biochar composite adsorbent was prepared using chitosan, Fe3O4, and sludge biochar as raw materials. The composite adsorbent was able to achieve rapid solid-liquid separation under an applied magnetic field. The morphology and microstructure of the composite adsorbent were characterized by FTIR, XRD, SEM, VSM, and BET analysis. The adsorption performance of the composite adsorbent on Cu2+ was investigated through static adsorption experiments, and the effects of adsorbent dosage, initial concentration of Cu2+, initial pH of the solution, and adsorption temperature on the adsorption efficiency of Cu2+ were discussed. The results showed that chitosan and Fe3O4 were successfully loaded on sludge biochar. When the initial concentration of Cu2+ was 30 mg/L, the dosage of the magnetic chitosan/sludge biochar composite material was 0.05 g, the adsorption time was 180 min, pH was 5, and the temperature was room temperature, the maximum removal rate of Cu2+ reached 99.77%, and the maximum adsorption capacity was 55.16 mg/g. The adsorption kinetics and adsorption isotherm data fitted well with the pseudo-second-order kinetic model and Langmuir adsorption isotherm model, indicating that the adsorption process was chemisorption with monolayer coverage.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
X-ray diffraction pattern of adsorbent.
Figure 2
Figure 2
Infrared spectrogram of adsorbent.
Figure 3
Figure 3
(a) SEM with 10,000 times SBC amplification, (b) SEM with 20,000 times SBC amplification.
Figure 4
Figure 4
(a) Fe3O4@CTS/SBC SEM with 10,000 times magnification, (b) Fe3O4@CTS/SBC SEM with 20,000 times magnification.
Figure 5
Figure 5
Adsorption isotherm type.
Figure 6
Figure 6
Adsorption and desorption isotherms of SBC and Fe3O4@CTS/SBC.
Figure 7
Figure 7
Aperture distribution of SBC and Fe3O4@CTS/SBC.
Figure 8
Figure 8
(a) Hysteresis loop of Fe3O4@CTS/SBC composite (b) coercivity curve of Fe3O4@CTS/SBC composite.
Figure 9
Figure 9
Influence of dosage on adsorption effect.
Figure 10
Figure 10
Effect of initial concentration of Cu2+ on adsorption effect.
Figure 11
Figure 11
Effect of solution pH on adsorption of Cu2+.
Figure 12
Figure 12
Effect of temperature on adsorption of Cu2+.
Figure 13
Figure 13
(a) Pseudo-first-order adsorption kinetic model (b) pseudo-second-order adsorption kinetic model, (c) Intraparticle diffusion model of Cu2+ adsorption (d) Boyd model of Cu2+ adsorption.
Figure 14
Figure 14
Fe3O4@CTS/SBC (a) Langmuir (b) Freundlich (c) Temkin isotherm model for Cu2+.
See this image and copyright information in PMC

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