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of Methylene Blue Using UV Radiation in Study of the Effective Parameters on Decolorizationof Methylene Blue Using UV Radiation in the Presence of Immobilized Catalyst
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Z Noori Motlagh   , R Darvishi , Gh Shams khoram abadi * 1, H Godini , M Foroughi |
| 1- , shams_lums@yahoo.com |
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Abstract: (21535 Views) |
| Introduction: Synthetic dyes are used in various industries such as cosmetics and he-alth products, leather, food, leather, plastic, paper and textile industries. Methylene blue is an important chemical aromatic dye wh-ich commonly used in textile industries. Due to being aromatic, it is often toxic, car-cinogenic, mutagenic and resistant to bio-degradation. In this study, the efficiency of UV/ZnO system was assessed through the immobilization of nanoparticles on glass as one of the advanced oxidation processes (AOP) for the decolorization of methylene blue.
Materials & Methods: This study was con-ducted as a batch process in a laboratory sc-ale. The nanoparticle powders were imm-obilized on glass plate with thermal meth-od. The nanoparticles were characterized by X-ray diffraction (XRD), transmission ele-ctron microscopy (TEM) and scanning elec-tron microscopy (SEM). Also, UV/vis spec-trophotometric was used to assess dye dec-olorization and the effects of important parameters such as the effect of UV, dye concentration, pH and different intensities of light on the efficiency of process were investigated.
Findings: This study showed that the UV agent in the absence of zinc oxide catalyst cannot remove the methylene blue dye, because it cannot individually generate en-ough decomposing agents (hydroxyl radical). Also, the results showed that the best pH value and radiation intensity were 7 and 3950μW/cm2 in 120 minutes, resp-ectively. The dye decolorization was enh-anced with decreasing initial dye conc-entration.
Discussion & Conclusion: The results sho-wed that in this process, the methylene blue dye can be decolorized using immobilized zinc oxide nanoparticles in the presence of UV-C radiation. Due to catalyst immobi-lization, the recycling and separation of nanoparticles are not necessary in this met-hod. Therefore, by optimization of desired effective parameters it may lead to the com-plete decolorization of methylene blue in a pilot scale. |
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| Keywords: methylene blue, UV radiation, advanced oxidation, catalyst immobilize-ation. |
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Full-Text [PDF 423 kb]
(8963 Downloads)
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Type of Study: Research |
Subject:
Environmental health
Received: 2013/05/19 | Accepted: 2013/09/1 | Published: 2013/09/1
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