δ-MnO2吸附氧化去除亚甲基蓝的机理

IF 2.8 4区 工程技术 Q2 CHEMISTRY, APPLIED
G. Yan, P. Wang, Yuqian Li, Zhangjie Qin, Shuai Lan, Yupeng Yan, Qin Zhang, Xiaodi Cheng
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引用次数: 9

摘要

材料δ-MnO2在去除亚甲基蓝(MB)方面表现出优异的性能,但该过程受到pH的显著影响,其影响机制尚不清楚。在本研究中,通过区分δ-MnO2在黑暗中对MB的吸附和氧化,研究了pH对合成的δ-MnO_2去除MB机理的影响。结果表明,随着pH值的增加,δ-MnO2对MB的总去除效率显著降低。δ-MnO_2可以通过吸附和氧化机制去除MB,并且在不同pH条件下,吸附去除和氧化去除的比例不同。随着初始pH从2.00增加到8.05,δ-MnO2的氧化还原电位降低,其去除MB的氧化能力也逐渐降低。相反,δ-MnO2的表面负电荷随着pH的增加而增加,对带正电荷MB的吸附能力也逐渐增强。这表明pH对δ-MnO2去除MB的影响主要是由其对δ-MnO2氧化能力的影响决定的。此外,进一步证明了pH值对MB在δ-MnO2上的氧化和吸附有显著影响。此外,通过观察反应过程中中间产物的Mn2+和UV-Vis光谱的变化,以及反应后δ-MnO2的FTIR和XPS表征的变化,进一步证明了pH对δ-MnO_2氧化MB的显著影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Adsorption-Oxidation Mechanism of δ-MnO2 to Remove Methylene Blue
The material, δ-MnO2, has exhibited superior performance on the removal of methylene blue (MB), but the process is significantly impacted by pH, and the impacting mechanism is still unclear. In this study, the effects of pH on the removal mechanism of MB using synthesized δ-MnO2 were investigated by distinguishing the adsorption and oxidation of MB by δ-MnO2 during the removal process in the dark. The results show that the total removal efficiency of MB by δ-MnO2 decreased significantly with an increase in the pH. MB could be removed by δ-MnO2 via an adsorption mechanism and oxidation mechanism, and the proportion of adsorptive removal and oxidative removal was different under different pH conditions. With an increase in the initial pH from 2.00 to 8.05, the redox potential of δ-MnO2 decreased, and its oxidation ability for the removal of MB also gradually decreased. In contrast, the surface negative charges of δ-MnO2 increased with an increase in the pH, and the adsorption ability towards positively charged MB also gradually increased. This indicates that the effects of pH on the removal of MB by δ-MnO2 are primarily dominated by its influence on the oxidation ability of δ-MnO2. In addition, it is further proved that the pH value has a significant effect on the oxidation and adsorption of MB on δ-MnO2. Moreover, the significant effects of pH on the oxidation of MB by δ-MnO2 are further demonstrated by observing the changes in Mn2+ and the UV-Vis spectra of intermediate products during the reaction, as well as the changes in the FTIR and XPS characterizations of δ-MnO2 after the reaction.
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来源期刊
Adsorption Science & Technology
Adsorption Science & Technology 工程技术-工程:化工
CiteScore
5.00
自引率
10.30%
发文量
181
审稿时长
4.5 months
期刊介绍: Adsorption Science & Technology is a peer-reviewed, open access journal devoted to studies of adsorption and desorption phenomena, which publishes original research papers and critical review articles, with occasional special issues relating to particular topics and symposia.
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