Polyoxometalate Intercalated MgAl-Layered Double Hydroxide for Degradation of Malachite Green

Abstract

Improving the selectivity of photocatalysis of LDH pristine (MgAl-LDH) and LDH composite (MgAl-SiW12 O40 ] and MgAl-[PW12 O40 ]) was synthesized and used for degraded malachite green (MG). The effects of the amount of catalyst, pH value, and reaction times on degradation performance were discussed. MG degraded better composites than LDH pristine. The results indicated that MgAl-LDH was successfully synthesized by showing the peak dif-fractions at angles 10.39°(003), 20.17°(006), and 34.8°(009). Both kinds of attained MgAl-[SiW12 O40 ] and MgAl-[PW12 O40 ] had the typical structure of LDH that proved by appeared diffraction at 2θ angles 7.73°, 28.6°, 35.6° for MgAl-[PW12 O40 ] and at 2θ angles 8.61°, 24.27°, 34.96° and 66.34° for MgAl-[SiW12 O40 ]. The FTIR result indicates materials used for fifth regeneration, which confirmed the LDH composite structure. The fotodegradation activity of MG for pristine MgAl LDH (56.1%), composites MgAl-Pw (84.6%) and MgAl-Si (87.8%), respectively. The successful ability of photodegradation process by the percentage of degradation on material LDH-polyoxometalate composite showed the increasing of photodegradation catalytic and the regeneration ability of LDH pristine.