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

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

[Display omitted] •Green synthesis of Ag-Al2O3.•Characterization of Ag-Al2O3 by advanced techniques.•Evaluation of catalytic activity of Ag-Al2O3 towards photo degradation of methylene blue.•Investigation of kinetics of Ag-Al2O3 catalyzed degradation of methylene blue. Visible light induced photo ca...

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Bibliographic Details
Published in:Chemical engineering research & design Vol. 148; pp. 218 - 226
Main Authors: Saeed, Muhammad, Muneer, Majid, Akram, Nadia, ul Haq, Atta, Afzal, Noshin, Hamayun, Muhammad
Format: Journal Article
Language:English
Published: Rugby Elsevier B.V 01-08-2019
Elsevier Science Ltd
Subjects:
Al2O3
Alumina
Aluminum oxide
Azadirachta indica
Catalysis
Catalysts
Catalytic activity
Dyes
Eley–Rideal
Langmuir–Hinshelwood
Mathematical analysis
Methylene blue
Nanoparticles
Performance degradation
Photocatalysis
Photodegradation
Rate constants
Reaction kinetics
Silver
Wastewater treatment
Eley–Rideal
Al2O3
Langmuir–Hinshelwood
Methylene blue
Azadirachta indica
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Summary:[Display omitted] •Green synthesis of Ag-Al2O3.•Characterization of Ag-Al2O3 by advanced techniques.•Evaluation of catalytic activity of Ag-Al2O3 towards photo degradation of methylene blue.•Investigation of kinetics of Ag-Al2O3 catalyzed degradation of methylene blue. Visible light induced photo catalytic degradation of dyes is an inviting approach in wastewater treatment techniques. In this study, silver loaded alumina was synthesized by immobilization of Ag nanoparticles on Al2O3 by facile green method with Azadirachta indica leaves extract and characterized by different advanced techniques. The prepared Ag-Al2O3 particles were tested as photo catalyst on degradation of methylene blue under visible irradiation. Ag-Al2O3 showed improved photo catalytic performance on photo degradation of methylene blue. The deposition of Ag enhanced the photo catalytic activity of Al2O3 from 35 to 95% degradation of methylene blue. Effect of various parameters on catalytic activity were investigated. Curve Expert computer program was used for kinetics analyses of the data according to Langmuir–Hinshelwood and Eley–Rideal mechanism. A 100mgL−1 solution (50mL) completely degraded in 120min of reaction duration at 50°C over 0.1g of 3% Ag-Al2O3 as catalyst. 0.01, 0.06 and 0.08min−1 were calculated as average rate constants at 30, 40 and 50°C respectively. 25.7kJmol−1 was calculated as average activation energy.
ISSN:0263-8762
1744-3563
DOI:10.1016/j.cherd.2019.06.020