Ag@MnxOy: an effective catalyst for photo-degradation of rhodamine B dye

Saeed, Muhammad; Ahmad, Aziz; Boddula, Rajender; Inamuddin, .; Azhar, Aisha

doi:10.1007/s10311-017-0661-z

Cited by 61 publications

(26 citation statements)

References 42 publications

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“…Higher pH favors the production of OH radicals; therefore, the photo catalytic activities of photo catalysts increase with pH. Figure 3 shows the effect of pH on photo catalytic activities of Agdoped manganese oxide [28]. Similarly, Ansari et al [29] have reported that TiO 2 and Agdoped TiO 2 catalyzed photo degradation of methyl orange and methylene blue dyes.…”

Section: Mechanism Of Photo Catalytic Degradationmentioning

confidence: 88%

“…These metal nanoparticles doped on semiconductor photo catalysts prevent the recombination of the electron-hole pair by the well-known Schottky barrier effect which results in an increase in quantum efficiency of the photo catalysts [26,27]. It has been reported, for example, that doping of Ag greatly enhanced the photo catalytic activities of the manganese oxide photo catalyst for degradation of rhodamine B dye in aqueous medium as shown in Figure 2 [28]. It was observed that 11% (in 15 min of reaction) and 45% (in 120 min of reaction) of 40 mL (200 ppm) solution of rhodamine B degraded when using manganese oxide as the photo catalyst at 40 C. In the presence of Ag-doped manganese oxide, 28% (in 15 min) and 91% (in 120 min) degradation of rhodamine B dye were achieved under similar reaction conditions.…”

Section: Mechanism Of Photo Catalytic Degradationmentioning

confidence: 99%

“…In the first step, the gaseous reactant, oxygen, gets adsorbed at the surface of the catalyst followed by a reaction Figure 2. Effect of doping of Ag on photo catalytic activities of manganese oxide for photo degradation of rhodamine B dye in aqueous medium [28].…”

Section: Kinetics Of Photo Catalytic Degradationmentioning

confidence: 99%

“…(3) to experimental data gave the best straight lines as given in Figure 4. The apparent rate constants determined from the slopes of straight line were 0.0136, 0.0151 and 0.0216 per minute at 303, 313 and 323 K, respectively [28]. Similarly, we studied the ZnO-catalyzed photo degradation of methyl orange in aqueous medium [30].…”

Section: Kinetics Of Photo Catalytic Degradationmentioning

confidence: 99%

“…Effect of pH on photo catalytic activities of Ag-doped manganese oxide for photo degradation of rhodamine B dye in aqueous medium[28].…”

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confidence: 99%

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Catalytic Degradation of Organic Dyes in Aqueous Medium

Saeed¹,

Usman²

2018

Photochemistry and Photophysics - Fundamentals to Applications

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Water pollution by the textile industry is an emerging issue. Textile industry is the major industrial sector which contributes to water pollution. Textile industry releases a huge amount of unfixed dyes in wastewater effluents. About 20% of the dye production all over the world is discharged as waste in industrial effluents by textile industry. These dyes are highly stable and colored substances which disturb the aqueous ecosystem significantly. Therefore, there is a need for methods to remove organic dyes from textile industrial effluents. Photo catalysis and catalytic wet oxidation are best practices for degradation of dyes in wastewater. In photo catalysis, the dye molecules can be completely degraded into inorganic non-toxic compounds by irradiation of the dye solution under visible or ultraviolet light in the presence of semiconductor metal-oxide photo catalysts. In catalytic wet oxidation, various metal-based catalysts in supported or unsupported form can be used as heterogeneous catalysts for degradation of dyes in the presence of oxygen or hydrogen peroxide. These processes have several preferences like easy separation of the catalyst from reaction mixture and recycling of the catalyst.

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Section: Mechanism Of Photo Catalytic Degradationmentioning

confidence: 88%

Section: Mechanism Of Photo Catalytic Degradationmentioning

confidence: 99%

Section: Kinetics Of Photo Catalytic Degradationmentioning

confidence: 99%

Section: Kinetics Of Photo Catalytic Degradationmentioning

confidence: 99%

“…Effect of pH on photo catalytic activities of Ag-doped manganese oxide for photo degradation of rhodamine B dye in aqueous medium[28].…”

mentioning

confidence: 99%

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Catalytic Degradation of Organic Dyes in Aqueous Medium

Saeed¹,

Usman²

2018

Photochemistry and Photophysics - Fundamentals to Applications

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Calotropis gigantea leaves assisted biosynthesis of ZnO and Ag@ZnO catalysts for degradation of rhodamine B dye in aqueous medium

Saeed

Siddique

Ibrahim

et al. 2020

Env Prog and Sustain Energy

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The semiconductor metal oxides based photocatalysis is one of the efficient techniques used for eradication of pollutants from wastewater. The plants mediated biosynthesis of metal oxides have got much interest due to environmentally friendly and cost‐effective nature. This article reports the Calotropis gigantea mediated biosynthesis of ZnO and Ag@ZnO as effective catalysts for degradation of rhodamine B (RhB) dye. After characterization with advanced techniques, the biosynthesized ZnO and Ag@ZnO were tested as photocatalysts on degradation of RhB dye under irradiation. The catalytic activity of ZnO and Ag@ZnO was estimated in terms of decolorization, COD, and TOC removal. Results showed that 50.4 and 90.2% decolorization, 41.3 and 74.8% removal of COD, and 45.3 and 83.5% removal of TOC were measured over ZnO and Ag@ZnO as photocatalysts in 120 min, respectively. The biosynthesized Ag@ZnO was a stable and reusable catalyst in degradation experiments.

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