Synthesis of MoO3 nanoparticles for azo dye degradation by catalytic ozonation

Manivel, Arumugam; Lee, Gang-Juan; Chen, Chin-Yi; Chen, Jing-Heng; Ma, Shih‐Hsin; Horng, Tzzy-Leng; Wu, Jerry J.

doi:10.1016/j.materresbull.2014.11.016

Cited by 122 publications

(45 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[4,8,22] There have been few reports on the study of photocatalytic performance of MoO 3 for degrading organic dye. [23] Moreover, the systematically comparative study of MoO 3 photocatalytic property (including h-MoO 3 and a-MoO 3 ) and their mechanism investigation are also seldom reported.…”

Section: Introductionmentioning

confidence: 99%

Metastableh-MoO₃and stableα-MoO₃microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

Deng

et al. 2015

Journal of Experimental Nanoscience

141

View full text Add to dashboard Cite

Metastable h-MoO 3 hexagonal prisms have been fabricated through a simple green ultrasonic-assisted chemical route. After calcination at 440 C for 2 h, the thermodynamically stable a-MoO 3 nanoplate-based rods have been achieved through a process of in situ phase transformation. The as-synthesised products have been characterised by powder X-ray diffraction, field emission scanning electron microscopy, Fourier transform infrared spectrum, UVÀvis diffuse reflection spectroscopy and photoluminescence spectroscopy. The phase transformation from metastable h-MoO 3 to stable a-MoO 3 is observed at 419 C according to the differential scanning calorimetry results. The possible growth mechanism of MoO 3 crystals has been proposed based on the experimental results. The prepared two kinds of MoO 3 samples both display higher photocatalytic performance for degrading rhodamine B compared to that of commercial MoO 3 . In the present system, a-MoO 3 nanoplate-based rods exhibit slightly higher degradation activity than h-MoO 3 hexagonal prisms, which is possibly due to its smaller band gap energy, smaller scale of nanoplate, better adsorption capacity and lower recombination of photogenerated electrons and holes.

show abstract

Section: Introductionmentioning

confidence: 99%

Metastableh-MoO₃and stableα-MoO₃microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

Deng

et al. 2015

Journal of Experimental Nanoscience

141

View full text Add to dashboard Cite

show abstract

“…The decomposition temperature of the complexes was defined by TGA/DTA using a Simultaneous Thermal Analyzer, Model: STA503 thermogeravimetric analyzer. The crystallite size of the nanocatalysts was estimated from the Debye-Sherrer equation [15]. The iodometric method was used to determine the concentration of gaseous and aqueous ozone [11].…”

Section: Methodsmentioning

confidence: 99%

“…Many metal oxides such as TiO 2 [6], Fe 2 O 3 /Al 2 O 3 [7], and nanomaterials such as Pt/carbon nanotube [8] have been studied in heterocatalyst/ozonation processes for the removal of oxalic acid. In addition, other catalysts have been used for the removal of different organic materials in catalytic ozonation: alumina for treating 2-chlorophenol [9]; biochar for phenol removal [10]; nano size Co 3 O 4 /CeO 2 for phenol treatment [11]; Au-Bi 2 O 3 nanocatalyst for treating acid orange 10 [12]; NiO-CuO for removal of dichloroacetic acid [13]; zeolite ZSM-5 for removal of ibuprofen [14]; MoO 3 nanocatalyst for decomposition of orange II dye [15]; and MgO nanocrystal for the degradation of reactive red 198 [3]. In recent years, some catalysts have been successfully exploited for the catalytic ozonation of RB5 dye in aqueous solution, including mesoporous carbon aerogel (MCA) supported copper oxide [1] and CuS [16].…”

Section: Introductionmentioning

confidence: 99%

A new nano-ZnO/perlite as an efficient catalyst for catalytic ozonation of azo dye

Shokrollahzadeh

Abassi

Ranjbar

2018

Environmental Engineering Research

View full text Add to dashboard Cite

In this investigation, nano ZnO was sonochemically synthesized by a novel method using a methionine precursor. A narrow size distribution (41-50 nm) of nano ZnO was achieved that was immobilized on perlite and applied as a catalyst in catalytic ozonation. The catalyst was characterized by fourier transform infrared spectroscopy, BET surface area, and field emission scanning electron microscope. The ozonation of recalcitrant Remazol black 5 (RB5) di-azo dye solution by means of the synthesized catalyst was investigated in a bubble column slurry reactor. The influence of pH values (7, 9, 11), catalyst dosage (8, 12, 15, 20 g L −1) and reaction time (10, 20, 30, 60 min) was investigated. Although the dye color was completely removed by single ozonation at a higher reaction time, the applied nanocatalyst improved the dye declorination kinetics. Also, the degradation of the hazardous aromatic fraction of the dye was enhanced five-times by catalytic ozonation at a low reaction time (10 min) and a neutral pH. The second-order kinetics was best fitted in terms of both RB5 color and its aromatic fraction removal. The total organic carbon analysis indicated a significant improvement in the mineralization of RB5 by catalytic ozonation using the nano-ZnO/perlite catalyst.

show abstract

“…MoO 3 finds application as a cathode material in the development of high-energy density solid state microbatteries (Rao et al, 2013;Cheng et al, 2006). Molybdenum oxide films and nano-crystals also find applications in catalysis (Manivel et al, 2015;Chen et al, 2010), ethonal and gas sensing (Bai et al, 2015;Khojier et al, 2014;Touihri et al, 2017) and in lubricants (Prasad et al, 2003;Hosono et al, 2005;Wang et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Thermo Optical Properties and Related Electronic Polarizabilities of MoO₃ Thin Films Using Ellipsometry

Hussain¹

2019

American Journal of Engineering and Applied Sciences

View full text Add to dashboard Cite

Thermo optical properties are reported for thermally evaporated MoO 3 thin films using ellipsometry. The values of TOCs: dn/dT and dk/dT relating to MoO 3 thin films are found to be negative and positive, respectively over the temperature range 295-460 K and also are found to have the same trend over the range 120-300 K, and have values of the order of 10 −4 K −1 and 10 −5 K −1 , respectively in the visible part of spectral range. The values of electronic polarizability were determined to be in the range from 8.2 to 8.21×10 −24 cm 3 in the temperature range 120-460 K and over the same part of spectral range. Vacuum-heating and annealing in an oxygen plasma environment certainly assists in reducing a large amount of porosity in the films, but these series of actions yield irreversible changes in the morphology of the films. Once the films during oxidative-annealing turned into black in colour and new reduced chemical states were produced, then after that, original states of the films were very hard to restore. Ellipsometric data of MoO thin films at or above the room temperature in the range 295-460 K seems to be controlled by first-order kinetics and could be interpreted in terms of polaronic excitations and hoppings. During the in-situ cooling runs, the changes in the ellipsometric data are interpreted in terms of bipolaronic excitations, but the possibility of simultaneous presence of polaronic and bipolaronic states cannot be ignored over the investigated temperature range.

show abstract

Synthesis of MoO3 nanoparticles for azo dye degradation by catalytic ozonation

Cited by 122 publications

References 40 publications

Metastableh-MoO₃and stableα-MoO₃microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

Metastableh-MoO₃and stableα-MoO₃microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

A new nano-ZnO/perlite as an efficient catalyst for catalytic ozonation of azo dye

Thermo Optical Properties and Related Electronic Polarizabilities of MoO₃ Thin Films Using Ellipsometry

Contact Info

Product

Resources

About

Synthesis of MoO3 nanoparticles for azo dye degradation by catalytic ozonation

Cited by 122 publications

References 40 publications

Metastableh-MoO3and stableα-MoO3microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

Metastableh-MoO3and stableα-MoO3microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

A new nano-ZnO/perlite as an efficient catalyst for catalytic ozonation of azo dye

Thermo Optical Properties and Related Electronic Polarizabilities of MoO3 Thin Films Using Ellipsometry

Contact Info

Product

Resources

About

Metastableh-MoO₃and stableα-MoO₃microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

Metastableh-MoO₃and stableα-MoO₃microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

Thermo Optical Properties and Related Electronic Polarizabilities of MoO₃ Thin Films Using Ellipsometry