Inorganic Chemicals Industry >
Study on preparation of γ-Al2O3 by microreaction and its properties for methyl orange adsorption
Received date: 2023-03-29
Online published: 2023-09-19
Using aluminum sulfate as aluminum source and ammonium bicarbonate as precipitator，pseudo-boehmite was prepared in a multi-channel impinging-flow microreactor.The pseudo-boehmite was calcined at 600 ℃ for 4 h to obtain γ-Al2O3.The γ-Al2O3 were characterized by fourier infrared spectroscopy，X-ray diffractometry，thermogravimetric differential thermal analyzer，field emission scanning electron microscopy，transmission electron microscopy，specific surface area and porosity analysis，ultraviolet spectrophotometer and Zeta potential analyzer.The adsorption properties of γ-Al2O3 prepared by different methods on methyl orange were studied.The results showed that the adsorption properties of γ-Al2O3 prepared by microreaction method was higher than conventional titration method.The adsorption process of methyl orange was consistent with Langmuir monomolecular layer model，and the adsorption kinetics was consistent with quasi-second-order kinetics.The optimum application conditions of γ-Al2O3 adsorbent were studied.Under optimal application conditions，the adsorption ratio of γ-Al2O3 to methyl orange was 58.8% within 5 min and 89.7% within 10 min and reached the highest 98.9% at adsorbed equilibrium.Cyclic experiments showed that γ-Al2O3 had excellent stability and maintained high decolorization ratio of methyl orange（95.6%） after four thermal regeneration cycles.
Key words： microchannel; alumina; adsorbent; methyl orange
WANG Mengdi , LUO Jin , WU Wei , ZHOU Jinghui , WANG Jing , SUN Yanmin , YU Haibin . Study on preparation of γ-Al2O3 by microreaction and its properties for methyl orange adsorption[J]. Inorganic Chemicals Industry, 2023 , 55(9) : 66 -74 . DOI: 10.19964/j.issn.1006-4990.2023-0176
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