Abstract
Arsenic has become a global concern in water environment, and it is essential to develop efficient remediation methods. In this study, a novel adsorbent by loading cerium and manganese oxide onto wheat straw-modified biochar (MBC) was manufactured successfully aiming to remove arsenic from polluted water. Through scanning electron microscopy and energy-dispersive spectroscopy (SEM-EDS), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectrometer (FT-IR), and other techniques, it was found the loading of cerium and manganese oxide on MBC played a significant role in As(V) adsorption. The results of the batch test showed that the adsorption of MBC followed the pseudo-second order kinetics and Langmuir equation. The adsorption capacity of MBC was 108.88 mg As(V)/g at pH = 5.0 (C0 = 100 mg/L, dosage = 0.5 g/L, T = 298 K) with considerable improvement compared to the original biochar. Moreover, MBC exhibited excellent performance over a wide pH range (2.0~11.0). Thermodynamics of the sorption reaction showed that the entropy (ΔS), changes of enthalpy (ΔH) and Gibbs free energy (ΔG), respectively, were 85.88 J/(moL·K), 22.54 kJ/mol and −1.33 to −5.20 kJ/mol at T = 278~323 K. During the adsorption, the formation of multiple complexes under the influence of its abundant surface M-OH (M represents the Ce/Mn) groups involving multiple mechanisms that included electrostatic interaction forces, surface adsorption, redox reaction, and surface complexation. This study indicated that MBC is a promising adsorbent to remove As(V) from polluted water and has great potential in remediating of arsenic contaminated environment.
Highlights
Arsenic (As) is a carcinogenic trace metal that has long been identified as a major human health hazard and is a global concern [1,2]
Scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) measurements were used to observe the structural morphology of modified biochar (MBC) using a JSM-7401 instrument (JEOL, Tokyo, Japan)
The morphology and structural properties of BC and MBC were characterized by scanning electron microscopy and energy-dispersive spectroscopy (SEM-EDS), and the BC modified with Ce-Mn produced particles with uneven surfaces compared with unmodified
Summary
Arsenic (As) is a carcinogenic trace metal that has long been identified as a major human health hazard and is a global concern [1,2]. Both natural and anthropogenic activities are sources of As pollution and include mining, fossil fuel combustion and pesticides. Arsenic contamination is a global environmental problem and polluted groundwater is posing an increasing degree of health risk [3]. In the 1990s, large-scale groundwater poisoning by As in Bangladesh was considered to be the largest poisoning event in human history
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