Characteristics and mechanisms of arsenic(V) adsorption
onto manganese oxide-doped aluminum oxide
Ting Liua,c, Kun Wub,*, Wen Xuea, Chao Maa
a College of resources and environment, Northwest A&F University, Yangling,
Shaanxi, 712100, China
b School of Environmental and Municipal Engineering, Xi’an University of
Architecture and Technology, Xi’an, Shaanxi, 710055, China
c Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China,
Ministry of Agriculture, Yangling, Shaanxi 712100, China
Corresponding author: Kun Wu
Email address: tomlikeit@gmail.com
Fig. S1 Surface charge density as a function of pH. (Experimental conditions:
adsorbent dosage = 0.5 g/L, ion strength = 0.01 M NaNO3, T = 293±0.5 K)
Fig. S2 (a) Effects of contact time on the As(V) uptake onto AlOOH, and (b) the fit of
kinetic data by using the intra-particle diffusion model. (Experimental
conditions: initial As(V) = 10 mg/L, pH = 7.0±0.1, ion strength = 0.01 M
NaNO3, adsorbent dosage = 0.3 g/L, reaction time = 24 h, T = 298±0.1 K)
Fig. S3 (a) Effects of equilibrium concentration on the As(V) amounts adsorbed onto
AlOOH, and (b) the fit of the isotherm data using Langmuir model.
(Experimental conditions: adsorbent dosage = 0.3 g/L, pH = 7.0±0.1, ion
strength = 0.01 M NaNO3, reaction time = 24 h, T = 298±0.1 K)
Fig. S4 Distribution of arsenate in aqueous solution as a function of pH.
Fig. S5 The residual concentrations of Al and Mn ions at various pH conditions after
As(V) adsorption by MODAO (Experimental conditions: initial As(V) = 30
mg/L, adsorbent dosage = 0.3 g/L, ionic strength = 0.01 M NaNO3,
equilibrium time = 24 h)
Fig. S6 XPS spectra of As3d of MODAO loaded with As(V). (Experimental
conditions: As(V) = 10 mg/L, pH = 6.0±0.1, ion strength = 0.01 M NaNO3,
adsorbent dosage = 0.3 g/L, reaction time = 24 h, T = 298±0.1 K)
Fig. S7 XPS spectra of (a) Al3p before and after the reaction with As(V); (b) Mn2p of
fresh MODAO; and (c) Mn2p of MODAO loaded with As(V). (Experimental
conditions: As(V) = 10 mg/L, pH = 6.0±0.1, ion strength = 0.01 M NaNO3,
adsorbent dosage = 0.3 g/L, reaction time = 24 h, T = 298±0.1 K)