The Effect and Mechanism of Carbon Nanotube on the Phase Transformation of Ferrihydrite

doi:10.19657/j.geoscience.1000-8527.2024.116

Abstract

Abstract:

Nano materials inevitably enter the soil and water environment in the process of usage and treatment, and then affect the composition, physicochemical properties, and the relative content of minerals in the near surface environment. However, the mechanism and process of mineral phase transformation in soil and soil by nanomaterial are still unclear. In this work, carbon nanotube (CNT), a typical nano material, was used to explore its effect on the phase transformation of ferrihydrite (Fh), a widely distributed nano mineral, by means of X-ray diffraction, scanning electron microscope, zeta potential, Fourier transform infrared spectroscopy and ammonium oxalate extraction experiment. The obtained results show that the main transformed product of Fh is hematite. The oppositely charged CNT interacts with Fh through electrostatic attraction and the formation of Fe-O-C bonds, which inhibit the transformation process of Fh without changing the type of the product. In addition, the coexisting CNT reduces the average particle size of hematite in the product. This work provides an example to understand the mechanism of mineral phase transformation in soil and explore the impact of artificial substances on soil.

Key words: ferrihydrite, carbon nanotube, mineral transformation, hematite

CLC Number:

YAN Lixia, REN Zihe. The Effect and Mechanism of Carbon Nanotube on the Phase Transformation of Ferrihydrite[J]. Geoscience, 2025, 39(03): 628-636.

Figures/Tables 8

Fig.1 Oxidation methods (a) and results (b) of CNT

Table 1 Instruments used in the test

仪器名称	型号	生产厂家
X射线衍射仪	D8 Advance	Bruker
傅里叶变换红外光谱仪	VERTEX 70v	Bruker
扫描电子显微镜	Supra 55	ZEISS
Zeta电位仪	Zetasizer Nano ZS90	Malvern

Fig.2 Characterization of samples before and after oxidation treatment XRD(a);FTIR(b);XPS(c);TEM((d)—(e))

Fig.3 Characterization of Fh and Fh-CNTs mixture

Fig.4 Phase transformation process of Fh

Fig.5 Transformation kinetics of the systems of Fh and 5%CNT

Fig.6 TEM images of the transformed products

Fig.7 Schematic drawing of the transformation process of Fh

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