水热法合成二氧化锰及其对染料的脱色性能研究

doi:10.19964/j.issn.1006-4990.2021-0019

摘要/Abstract

摘要：

采用水热法以十二烷基苯磺酸钠为模板合成二氧化锰,并研究水热温度对二氧化锰的结构和染料脱色性能的影响,以及样品投加量和染料溶液的pH对二氧化锰染料脱色性能的影响。结果表明:当水热温度为110 ℃时,得到2~8 μm球状γ-二氧化锰,对亚甲基蓝（MB）和罗丹明B（RhB）的脱色效果最好。当其投加量为6 g/L时,分别对50 mg/L的MB和RhB脱色率达到86.95%和76.07%。强酸和强碱条件下其对MB的脱色率有明显的提升,二氧化锰对MB的吸附过程符合Langmuir和Freundlich等温模型;强酸条件下其对RhB的脱色率有明显的提升,对RhB的吸附过程符合Freundlich等温模型。二氧化锰样品可循环使用,循环吸附3次后对MB和RhB的吸附量分别减少1.08 mg/g和2.66 mg/g。

关键词: 水热法, 二氧化锰, 脱色, 亚甲基蓝, 罗丹明B

Abstract:

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

中图分类号:

TQ137.12

朱丹琛,李名洁,陈彰旭,林倩. 水热法合成二氧化锰及其对染料的脱色性能研究[J]. 无机盐工业, 2021, 53(11): 60-65.

ZHU Danchen,LI Mingjie,CHEN Zhangxu,LIN Qian. Study on hydrothermal synthesis of MnO₂ and its decolorization performance on dyes[J]. Inorganic Chemicals Industry, 2021, 53(11): 60-65.

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温度/ ℃	Langmuir等温模型			Freundlich等温模型
温度/ ℃	K_L/ （L·mg^-1）	Q_m/ （mg·g^-1）	R²	K_F	1/n	R²
25	0.039 2	63.572 8	0.998 3	5.004 0	0.454 5	0.908 1
35	0.022 3	79.302 1	0.989 3	4.054 3	0.513 01	0.965 0
45	0.012 3	116.009 3	0.957 9	3.707 7	0.565 51	0.986 8

温度/ ℃	Langmuir等温模型			Freundlich等温模型
温度/ ℃	K_L/ （L·mg^-1）	Q_m/ （mg·g^-1）	R²	K_F	1/n	R²
25	0.050 4	32.894 7	0.822 2	2.500 7	0.605 2	0.943 9
35	0.072 4	24.330 9	0.959 2	2.566 6	0.541 7	0.964 7
45	0.022 5	51.020 4	0.722 5	1.510 9	0.767 8	0.972 3

循环次数	MB吸附量/（mg·g^-1）	RhB吸附量/（mg·g^-1）
0	17.16	15.58
1	16.38	15.13
2	16.31	13.77
3	16.08	12.92

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