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Study on hydrothermal synthesis of MnO2 and its decolorization performance on dyes
Received date: 2021-01-08
Online published: 2021-11-15
MnO2 was synthesized by hydrothermal method using sodium dodecyl benzene sulfonate as templates.The effect of hydrothermal temperature on the structure of MnO2 and decolorization properties of dyes and the effect of product dosage and pH of dye solution on decolorization performance of dyes by MnO2 were studied.The results showed that when the hydro-thermal temperature was 110 ℃,2~8 μm spherical γ-MnO2 were obtained,which had the best decolorization rate on methylene blue（MB） and Rhodamine B（RhB）.When the adding amount of MnO2 was 6 g/L,the decolorization rates of 50 mg/L MB and RhB reached 86.95% and 76.07%,respectively.The addition of strong acid and strong alkali had a significant increase in the decolorization rate of MB.The adsorption process of MnO2 on MB was conformed to the Langmuir and Freundlich isothermal model.The addition of strong acid had a significant increase in the decolorization rate of RhB.The adsorption pro-cess of MnO2 on RhB conformed to the Freundlich isothermal model.The product was recyclable,and the adsorption amount of MB and RhB only decreased with 1.08 mg/g and 2.66 mg/g after three cyclic adsorption,respectively.
Key words： hydrothermal method; manganese dioxide; decolorization; methylene blue; rhodamine B
Danchen ZHU , Mingjie LI , Zhangxu CHEN , Qian LIN . Study on hydrothermal synthesis of MnO2 and its decolorization performance on dyes[J]. Inorganic Chemicals Industry, 2021 , 53(11) : 60 -65 . DOI: 10.19964/j.issn.1006-4990.2021-0019
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