Synthesis and characterization of silver loaded alumina and evaluation of its photo catalytic activity on photo degradation of methylene blue dye

Saeed, Muhammad; Muneer, Majid; Akram, Nadia; Haq, Atta ul; Afzal, Noshin; Hamayun, Muhammad

doi:10.1016/j.cherd.2019.06.020

Cited by 41 publications

(12 citation statements)

References 65 publications

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“…Activation energy (Ea) was determined as 20.6 kJ/mol using the Arrhenius plot ( Figure 5 c). The data obtained were consistent with the results of previous studies where the Ea was reported as 27.1 and 25.7 kJ/mol for 0.1 g Ag-TiO 2 [ 59 ] and 0.1 g of 3% Ag/Al 2 O 3 [ 61 ] composites, respectively. As an advantage, the results in our study indicated a lower activation energy.…”

Section: Resultssupporting

confidence: 92%

Application of Silver-Loaded Composite Track-Etched Membranes for Photocatalytic Decomposition of Methylene Blue under Visible Light

et al. 2021

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In this study, the use of composite track-etched membranes (TeMs) based on polyethylene terephthalate (PET) and electrolessly deposited silver microtubes (MTs) for the decomposition of toxic phenothiazine cationic dye, methylene blue (MB), under visible light was investigated. The structure and composition of the composite membranes were elucidated by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction technique. Under visible light irradiation, composite membrane with embedded silver MTs (Ag/PET) displayed high photocatalytic efficiency. The effects of various parameters such as initial dye concentration, temperature, and sample exposure time on the photocatalytic degradation process were studied. The decomposition reaction of MB was found to follow the Langmuir–Hinshelwood mechanism and a pseudo-first-order kinetic model. The degradation kinetics of MB accelerated with increasing temperature and activation energy, Ea, was calculated to be 20.6 kJ/mol. The reusability of the catalyst was also investigated for 11 consecutive runs without any activation and regeneration procedures. The Ag/PET composite performed at high degradation efficiency of over 68% after 11 consecutive uses.

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Section: Resultssupporting

confidence: 92%

Application of Silver-Loaded Composite Track-Etched Membranes for Photocatalytic Decomposition of Methylene Blue under Visible Light

et al. 2021

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“…Based on the literature, the mechanism for this process is assumed as Eley–Rideal mechanism. [ 43,44 ] Considering a pseudo‐first‐order kinetic, [ 45 ] the reduction of each dye was performed at four different reaction temperatures (298, 303, 308, and 313 K). According to the literature, [ 45 ] k app can be assessed from Equation .…”

Section: Resultsmentioning

confidence: 99%

Pd on magnetic hybrid of halloysite and POSS‐containing copolymer: An efficient catalyst for dye reduction

Sadjadi

Koohestani

Atai

2020

Applied Organom Chemis

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A novel catalytic nanocomposite, MNPs/Hal‐POSS‐HEMA‐Pd, composed of halloysite nanoclay and polyhedral oligomeric silsesquioxane is reported. To synthesize the catalyst, magnetic halloysite was vinyl functionalized and then polymerized with 2‐hydroxyethyl methacrylate and methacrylate polyhedral oligomeric silsesquioxane. Afterwards, the latter was palladated to furnish a heterogeneous catalyst with use for catalyzing the reductive degradation of organic dyes, Rhodamine B, and methyl orange with NaBH4. The kinetic and thermodynamic parameters of both reactions were estimated. The results asserted that low content of the catalyst could catalyze the dye reduction reactions to furnish hydrogenated product in quantitative conversion in a very short reaction times (1 min). It is assumed that both halloysite and polyhedral oligomeric silsesquioxane can contribute to the anchoring of Pd nanoparticles. On the other hand, the polymeric network around halloysite can furnish a microenvironment for bringing dyes in the vicinity of active sites. Moreover, unique tubular morphology of halloysite can effectively improve dye adsorption and consequently enhance dye reduction. Additionally, the study of the recyclability of the catalyst approved that it could be magnetically recovered and reused for ten successive reaction runs with trivial leach of Pd (2 wt.%) and decrement of the catalytic activity.

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“…The kinetics of heterogeneous catalytic reactions can be described in terms of two commonly used mechanisms. [28][29][30][31] 1. The Langmuir-Hinshelwood mechanism 2.…”

Section: Kinetic Modelingmentioning

confidence: 99%

“…This adduct species is an unstable reactive intermediate, which may either decompose to degradation products or may recombine with a photoexcited electron. 31 ZnO − rGO + MB 1 → MB ads ,…”

Section: Kinetic Modelingmentioning

confidence: 99%

Kinetic modeling of ZnO‐rGO catalyzed degradation of methylene blue

Nisar

Saeed

Usman

et al. 2020

Int J of Chemical Kinetics

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Photodegradation of organic pollutants strongly depends on design of metal oxide semiconductor photocatalysts. Graphene, if composited with ZnO, can effectively enhance its photocatalytic performance for the eradication of pollutants from aqueous medium. Here in, ZnO‐rGO is reported as highly active catalyst for degradation of methylene blue. A 200‐mg/L solution of methylene blue dye was completely degraded within 1 h in comparison to 74% and 56% degradation over ZnO and rGO, respectively. The commonly used mechanisms of heterogeneous catalytic reactions, the Langmuir‐Hinshelwood mechanism, and the Eley‐Rideal mechanisms, were used to describe the reaction kinetics. The Langmuir‐Hinshelwood mechanism was found as more favorable in this study. Apparent activation energy, Eap, true activation energy, ET, entropy, ΔS, and enthalpy, ΔH were calculated as 36.2 kJ/mol, 13.1 kJ/mol, 197.5 J/mol, and 23.1 kJ/mol, respectively.

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Synthesis and characterization of silver loaded alumina and evaluation of its photo catalytic activity on photo degradation of methylene blue dye

Cited by 41 publications

References 65 publications

Application of Silver-Loaded Composite Track-Etched Membranes for Photocatalytic Decomposition of Methylene Blue under Visible Light

Application of Silver-Loaded Composite Track-Etched Membranes for Photocatalytic Decomposition of Methylene Blue under Visible Light

Pd on magnetic hybrid of halloysite and POSS‐containing copolymer: An efficient catalyst for dye reduction

Kinetic modeling of ZnO‐rGO catalyzed degradation of methylene blue

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