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Decolorization of RhB dye by manganese oxides: effect of crystal type and solution pH

Overview of attention for article published in Geochemical Transactions, July 2015
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Title
Decolorization of RhB dye by manganese oxides: effect of crystal type and solution pH
Published in
Geochemical Transactions, July 2015
DOI 10.1186/s12932-015-0024-2
Pubmed ID
Authors

Hao-Jie Cui, Hai-Zheng Huang, Baoling Yuan, Ming-Lai Fu

Abstract

Organic dye pollution in water has become a major source of environmental pollution. Mn(III/IV) oxides have attracted a great deal of attention to remove organic dye pollutants due to their unique structures and physicochemical properties. Numerous studies have reported the removal of dye by various Mn(III/IV) oxides through catalytic degradation and adsorption. The crystalline structures of manganese oxides and solution pH may exert substantial impact on the removal of dyes. However, few studies have focused on the oxidative degradation of RhB dye using Mn(III/IV) oxides with different crystal structures during a spontaneous reaction. In the present study, three manganese oxides with different crystal type (α-MnO2, β-MnO2, and δ-MnO2) were prepared by refluxing process to decolorize RhB dye in various pH solutions. The results showed that the decolorization efficiencies of RhB for the three manganese oxides all increase with decrease solution pH. α-MnO2 exhibited highest activity and could efficiently degrade RhB at pH 2-6. The degradation of RhB by β-MnO2 and δ-MnO2 could be observed at pH 2-3, and only little adsorption RhB on manganese oxides could be found at pH 4-6. The UPLC/MS analysis suggests that the decolorization of RhB by manganese oxides consists of three main stages: (1) cleavage of the ethyl groups from RhB molecular to form Rh; (2) further destruction of -COOH and -CNH2 from Rh to form the small molecular substances; (3) mineralization of the small molecular substances into CO2, H2O, NO3 (-) and NH4 (+). Overall, these results indicate that α-MnO2 may be envisaged as efficient oxidants for the treatment of organic dye-containing wastewater under acid conditions.

Twitter Demographics

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Mendeley readers

The data shown below were compiled from readership statistics for 35 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 35 100%

Demographic breakdown

Readers by professional status Count As %
Student > Master 9 26%
Student > Ph. D. Student 9 26%
Student > Bachelor 5 14%
Researcher 3 9%
Student > Doctoral Student 2 6%
Other 7 20%
Readers by discipline Count As %
Chemistry 16 46%
Unspecified 5 14%
Engineering 3 9%
Materials Science 3 9%
Environmental Science 3 9%
Other 5 14%

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 27 August 2015.
All research outputs
#10,020,779
of 12,523,022 outputs
Outputs from Geochemical Transactions
#46
of 64 outputs
Outputs of similar age
#164,085
of 238,776 outputs
Outputs of similar age from Geochemical Transactions
#1
of 1 outputs
Altmetric has tracked 12,523,022 research outputs across all sources so far. This one is in the 11th percentile – i.e., 11% of other outputs scored the same or lower than it.
So far Altmetric has tracked 64 research outputs from this source. They receive a mean Attention Score of 3.3. This one is in the 1st percentile – i.e., 1% of its peers scored the same or lower than it.
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