Significant Enhancement in Removal of Methyl Orange from Aqueous Solution in the Presence of Rhodamine B Using Ag3PO4 Photocatalyst

AbstractBismuth oxybromide (BiOBr) has attracted a resurgence of interest due to the outstanding visible light driven photocatalytic performance, which has been widely reported. However, its photosensitization degradation performance of methyl orange (MO) is limited possibly caused by low negative LUMO (lowest unoccupied molecular orbitals) level of MO molecules. The work presented here deals with the improved photodegradation behavior of methyl orange molecules onto BiOBr in the presence of Rhodamine B (RhB, as photosensitizer) through a semiconductor-mediated process. It was found that MO could be photodecomposed much effectively under the assistance of RhB molecules from aqueous solution. The photosensitization process which occurred between RhB and BiOBr is of photochemical origin and responsible for the boosted photodegradation behavior towards MO, which strongly depends on the irradiation time, BiOBr dosage and concentration of model contaminant (MO) and photosensitizer (RhB).

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Green Synthesis of Palladium/Titanium Dioxide Nanoparticles and their Application for the Reduction of Methyl Orange, Congo Red and Rhodamine B in Aqueous Medium

Combinatorial Chemistry & High Throughput Screening ◽

10.2174/1386207320666171023154523 ◽

2018 ◽

Vol 20 (9) ◽

pp. 787-795 ◽

Cited By ~ 4

Author(s):

Mehdi Maham ◽

Mahmoud Nasrollahzadeh ◽

Mojtaba Bagherzadeh ◽

Reza Akbari

Keyword(s):

Titanium Dioxide ◽

Methyl Orange ◽

Green Synthesis ◽

Aqueous Medium ◽

Rhodamine B ◽

Congo Red ◽

Titanium Dioxide Nanoparticles

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Self-Assembled Nanomaterials Based on Complementary Sn(IV) and Zn(II)-Porphyrins, and Their Photocatalytic Degradation for Rhodamine B Dye

Molecules ◽

10.3390/molecules26123598 ◽

2021 ◽

Vol 26 (12) ◽

pp. 3598

Author(s):

Nirmal K. Shee ◽

Hee-Joon Kim

Keyword(s):

Aqueous Solution ◽

Visible Light Irradiation ◽

Rhodamine B ◽

Self Assembly ◽

The Self ◽

Assembly Process ◽

Absorption Bands ◽

Ligand Coordination ◽

Rhodamine B Dye ◽

Metal Ligand

A series of porphyrin triads (1–6), based on the reaction of trans-dihydroxo-[5,15-bis(3-pyridyl)-10,20-bis(phenyl)porphyrinato]tin(IV) (SnP) with six different phenoxy Zn(II)-porphyrins (ZnLn), was synthesized. The cooperative metal–ligand coordination of 3-pyridyl nitrogens in the SnP with the phenoxy Zn(II)-porphyrins, followed by the self-assembly process, leads to the formation of nanostructures. The red-shifts and remarkable broadening of the absorption bands in the UV–vis spectra for the triads in CHCl3 indicate that nanoaggregates may be produced in the self-assembly process of these triads. The emission intensities of the triads were also significantly reduced due to the aggregation. Microscopic analyses of the nanostructures of the triads reveal differences due to the different substituents on the axial Zn(II)-porphyrin moieties. All these nanomaterials exhibited efficient photocatalytic performances in the degradation of rhodamine B (RhB) dye under visible light irradiation, and the degradation efficiencies of RhB in aqueous solution were observed to be 72~95% within 4 h. In addition, the efficiency of the catalyst was not impaired, showing excellent recyclability even after being applied for the degradation of RhB in up to five cycles.

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Sulfobetaine Cryogels for Preferential Adsorption of Methyl Orange from Mixed Dye Solutions

Polymers ◽

10.3390/polym13020208 ◽

2021 ◽

Vol 13 (2) ◽

pp. 208

Author(s):

Ramona B. J. Ihlenburg ◽

Anne-Catherine Lehnen ◽

Joachim Koetz ◽

Andreas Taubert

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Methyl Orange ◽

Dye Removal ◽

Selective Adsorption ◽

Water Soluble ◽

Organic Substances ◽

Preferential Adsorption ◽

Dimethyl Ammonium ◽

Dye Solutions

New cryogels for selective dye removal from aqueous solution were prepared by free radical polymerization from the highly water-soluble crosslinker N,N,N’,N’-tetramethyl-N,N’-bis(2-ethylmethacrylate)-propyl-1,3-diammonium dibromide and the sulfobetaine monomer 2-(N-3-sulfopropyl-N,N-dimethyl ammonium)ethyl methacrylate. The resulting white and opaque cryogels have micrometer sized pores with a smaller substructure. They adsorb methyl orange (MO) but not methylene blue (MB) from aqueous solution. Mixtures of MO and MB can be separated through selective adsorption of the MO to the cryogels while the MB remains in solution. The resulting cryogels are thus candidates for the removal of hazardous organic substances, as exemplified by MO and MB, from water. Clearly, it is possible that the cryogels are also potentially interesting for removal of other compounds such as pharmaceuticals or pesticides, but this must be investigated further.

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