Preparation and adsorption-photocatalytic performance of ZnAl@layered double oxides
The precursor-calcination approach was employed to fabricate ZnAl@layered double oxides(LDOs)with dual functionality with adsorption and photocatalysis.The effect of bimetallic ratios and calcination temperatures on the adsorption-photocatalytic degradation of tetracycline(TC)was systematically investigated by X-ray powder dif-fraction(XRD),infrared spectroscopy(FTIR),ultraviolet-visible diffuse reflection spectroscopy(UV-Vis DRS),and scanning electron microscope(SEM).The results indicated that a molar ratio of 2∶1 for Zn to Al and a calcination temperature of 400 CC resulted in Zn2Al1@LDO400 with outstanding adsorption-photocatalytic activity.Moreover,adsorption studies revealed that Zn2Al1@LDO400 displayed the chemisorption-limited heterogeneous monolayer adsorption for TC,with higher temperatures promoting the adsorption process.Simultaneously,the collaborative deg-radation of TC by photogenerated holes(h+),hydroxyl radicals(·OH),and superoxide radicals(·O2-)was confirmed through free radical quenching experiments and electron paramagnetic resonance(EPR)tests.
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维普
