Abstract
Silver tungstate (a-Ag2WO4), sieve molecular mesoporous (SBA-15), and a-Ag2WO4/SBA-15 x% (x is mass ratio of 5, 10, and 20% of a-Ag2WO4 to SBA-15) were synthetized by sonochemical, hydrothermal, and post-synthesis methods, respectively. The materials were characterized by powder X-ray diffractometry (XRD), field emission electron microscopy (SEM), N2 adsorption/desorption, X-ray photoelectron spectroscopy (XPS), and zeta potential. The characterizations verify that silver tungstate (a-Ag2WO4) and nanocomposite a-Ag2WO4/SBA-15 x% were obtained. The performance of a-Ag2WO4/SBA-15 x% in adsorption of RhB depended on percentage of a-Ag2WO4. The RhB adsorption behavior onto adsorbents was well fitted to pseudo-second order kinetics and Langmuir isotherm model. The removal efficiency of a-Ag2WO4/SBA-15 20% (1.050 g L-1) was 100% for RhB 50 ppm at 30 min. Moreover, 80% of RhB was recuperated from adsorbents at neutral pH.
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