Adsorption of As(V) by the Novel and Efficient Adsorbent Cerium-Manganese Modified Biochar

摘要: Arsenic has become a global concern in water environment, and it is essential to develop efficient remediation methods. In this study, novel adsorbent by loading cerium manganese oxide onto wheat straw-modified biochar (MBC) was manufactured successfully aiming remove arsenic from polluted water. Through scanning electron microscopy energy-dispersive spectroscopy (SEM-EDS), X-ray diffractometer (XRD), photoelectron (XPS), Fourier transform infrared spectrometer (FT-IR), other techniques, found the of on MBC played significant role As(V) adsorption. The results batch test showed that adsorption followed pseudo-second order kinetics Langmuir equation. capacity 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 original biochar. Moreover, exhibited excellent performance over wide range (2.0~11.0). Thermodynamics sorption reaction entropy (ΔS), changes enthalpy (ΔH) Gibbs free energy (ΔG), respectively, were 85.88 J/(moL·K), 22.54 kJ/mol −1.33 −5.20 278~323 K. During adsorption, formation multiple complexes under influence its abundant surface M-OH (M represents Ce/Mn) groups involving mechanisms included electrostatic interaction forces, redox reaction, complexation. This study indicated promising great potential remediating contaminated environment.