Fabrication, characterization of β-MnO2 microrod catalysts and their performance in rapid degradation of dyes of high concentration

Yu, Changlin; Gao, Li; Wei, Longfu; Fan, Qizhe; Shu, Qing; Yu, Jimmy C.

doi:10.1016/j.cattod.2013.11.029

Cited by 107 publications

(54 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The main species at a binding energy of 529.7 eV was assigned to the lattice oxygen (O 2− ) (denoted as O latt ), [37][38][39] and the signal at a binding energy of 531. 30,41,42 and the results of the Mn 2p spectra. In view of the system shift by 0.4 eV on the spectra of β-MnO 2 , the binding energy locations of both O ads and O latt in the β-sample are also disposed with a shift of about 0.4 eV when the deconvolution is carried out.…”

Section: 37mentioning

confidence: 99%

Catalytic oxidation of formaldehyde over manganese oxides with different crystal structures

Zhang

Wang

et al. 2015

Catal. Sci. Technol.

494

254

View full text Add to dashboard Cite

, β-, γ-and δ-MnO 2 catalysts were prepared by a hydrothermal method and tested for the catalytic oxidation of formaldehyde (HCHO) at low temperature. Dramatic differences in activities among the MnO 2 catalysts with different crystal structures were observed. The δ-MnO 2 catalyst exhibited the best activity among the four catalysts and achieved nearly complete HCHO conversion at 80°C, while the α-, β-and γ-type MnO 2 obtained 100% HCHO conversion at 125°C, 200°C, 150°C, respectively. The catalysts were next characterized by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), Field-Emission Scanning Electron Microscopy (FE-SEM), temperature-programmed reduction by H 2 (H 2 -TPR), X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption of HCHO (HCHO-TPD) methods to investigate the factors influencing the catalytic activity. Based on the characterization results, it is supposed that the tunnel structure and active lattice oxygen species are the main factors that contribute to the excellent performance of δ-MnO 2 . According to the high catalytic performance and facile preparation process, δ-MnO 2 may potentially be used as a support in applications of supported catalysts.

show abstract

Section: 37mentioning

confidence: 99%

Catalytic oxidation of formaldehyde over manganese oxides with different crystal structures

Zhang

Wang

et al. 2015

Catal. Sci. Technol.

494

254

View full text Add to dashboard Cite

show abstract

“…In practical dye waste water treatment, the photocatalytic technique still confronts with some problems, such as the low degradation efficiency, high operating cost, and difficulty in recycling catalysts. At the same time, high-concentration dye solutions always show a thick color, which further decreases the photocatalytic efficiency due to poor light transmittance (34,35). Therefore, how to promote the photocatalytic efficiency is one of the main tasks to meet the urgent needs.…”

Section: Design Of Heterojunction To Enhance Photocatalytic Performancementioning

confidence: 98%

Some Strategies in Designing Highly Efficient Photocatalysts for Degradation of Organic Pollutants in Water

Zhou

Gao

et al. 2014

ACS Symposium Series

Self Cite

View full text Add to dashboard Cite

R.J.)Over the past decades, with the fast development of chemical industry, organic pollutants in water have become a major source of environmental pollution in waste fields. Photocatalysis, as a "green chemistry" technology, has attracted much attention in pollutants degradation due to its efficient degradation rate, high mineralization efficiency and low toxigenicity, ideally producing CO 2 and H 2 O as the end-products. Photocatalytic degradation of organic pollutants includes fabrication of photocatalytic materials, research of reaction kinetics and working mechanism. This Chapter presents some new strategies in the design of highly efficient photocatalysts for degradation of organic pollutants, such as the design and fabrication of hetero-structured or microspherical photocatalysts, and sonochemical synthesis of photocatalysts with novel nano-structures. The formation of well-defined junctions between two semiconductors with matchied electronic band structure can effectively facilitate charge transfer and suppress the recombination of photo-generated electrons and holes, leading to extremely high activity and stability. Once the photocatalysis is applied on a large scale, operating costs should be emphasized, and recycling of photocatalysts becomes important in order to cut down the operating costs to an affordable level. Compared to the conventional nano-powder

show abstract

“…In Fig. 5 shows the UV-vis absorption spectra of RB and IC as a function of the catalytic reaction time [11]. Both RB and IC solutions turns colorless after 30 min, which indicates complete degradation of the dye molecules by MnO 2 .…”

Section: Photocatalytic Activity Of Mnomentioning

confidence: 99%

Electro chemical and photo catalytic studies of MnO2 nanoparticle from waste dry cell batteries

Mylarappa¹,

Venkata²,

Vishnu³

et al. 2016

Nanosystems: Phys. Chem. Math.

View full text Add to dashboard Cite

The objective of the existing research was essentially focused on recovery of MnO 2 nanoparticles from consumed dry cells by employing adapted hydrometallurgical process. Experimental tests for the recovery of MnO 2 present in the dry cell batteries have been carried out by an acidic reductive leachant, namely oxalic acid. The elemental compositions of the recovered metals from dry cells were confirmed by Energy Dispersive X-ray analysis (EDAX). Surface morphology of the recovered metals was examined using Scanning Electron Microscopy (SEM). Phase composition of the recovered metals from dry cell batteries were confirmed from X-ray Diffract meter (XRD). Cyclic Voltammetry (CV) studies were carried out to clarify the reversibility of the reactions. The obtained MnO 2 catalyst was applied for the degradation of different non-volatile dye compounds such as Indigo carmine (IC) and Rhodamine B (RB). The performance of MnO 2 shows fast degradation of dyes of high concentration.

show abstract

Fabrication, characterization of β-MnO2 microrod catalysts and their performance in rapid degradation of dyes of high concentration

Cited by 107 publications

References 41 publications

Catalytic oxidation of formaldehyde over manganese oxides with different crystal structures

Catalytic oxidation of formaldehyde over manganese oxides with different crystal structures

Some Strategies in Designing Highly Efficient Photocatalysts for Degradation of Organic Pollutants in Water

Electro chemical and photo catalytic studies of MnO2 nanoparticle from waste dry cell batteries

Contact Info

Product

Resources

About