| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1056944 | Journal of Environmental Management | 2012 | 9 Pages |
Two adsorbents, magnesia-loaded fly ash cenospheres (MGLC) and manganese-loaded fly ash cenospheres (MNLC), were prepared by wet impregnation of fly ash cenospheres with MgCl2 solution or a mixed solution of MnCl2 and KMnO4, respectively. Their physicochemical properties were characterized by scanning electron microscopy, X-ray diffractometry, X-ray fluorescence spectrometry, and Fourier transform infrared spectrometry. Sorption experiments were conducted to examine the effects of adsorbent dosage, pH, time, temperature, ionic strength and competing anions on As(V) removal by MGLC and MNLC. Both MGLC and MNLC had greater pH buffering capacity and were less affected by changes in ionic strength. Competing anions (carbonate and dihydric phosphate) had a larger impact on As(V) removal by MNLC than by MGLC. Adsorption on MNLC reached equilibrium at 60 min, while adsorption on MGLC reached equilibrium at 120 min. The Langmuir adsorption isotherm was a good fit for the experimental data of As(V) adsorption on MGLC and MNLC, and the adsorption kinetics for both followed the pseudo-second-order rate equation. MGLC and MNLC had a larger removal capacity for As(V) than the cenospheres. Compared with MNLC, MGLC is a better absorbent.
► Two adsorbents, MGLC and MNLC were prepared for As(V) removal. ► Both MGLC and MNLC were less affected by changes in pH value and ionic strength. ► Competing anions (CO32− and HCO3−) had a larger impact on As(V) removal by MNLC than by MGLC. ► The Langmuir adsorption isotherm was a good fit for As(V) adsorption on MGLC and MNLC. ► The adsorption kinetics for both MGLC and MNLC followed the pseudo-second-order rate equation.
