Photocatalyst Decolorization of C. I. Sulphur Red 14 From Aqueous Solution by UV Irradiation in the Presence of ZnO Nanopowder

Kamani, Hossein; Bazrafshan, Edris; Ghozikali, Mohammad Ghanbari; Askari, Majid; Ameri, Reza

doi:10.17795/jhealthscope-22248

Cited by 10 publications

(5 citation statements)

References 21 publications

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“…While, at high amount of catalyst (above the limiting value), the rate of reaction depresses the penetration of light with increase of the turbidity for a solution due to screening effect [28][29][30]. In Fig.…”

Section: Effect Of Commercial Zno Dosementioning

confidence: 99%

Photo-Decolourization Kinetics of Acid Red 87 Dye in ZnO Suspension Under Different Types of UV-A Light

Ahmed¹

2018

Asian J. Chem.

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Section: Effect Of Commercial Zno Dosementioning

confidence: 99%

Photo-Decolourization Kinetics of Acid Red 87 Dye in ZnO Suspension Under Different Types of UV-A Light

Ahmed¹

2018

Asian J. Chem.

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“…First, they have significantly wider surface areas than other particles. Furthermore, they can be combined with different chemical groups to increase their tendency to remove the target compounds (9,10).…”

Section: Introductionmentioning

confidence: 99%

Application of Different Isotherm Models for Humic Acid Adsorption on to Bentonite and Montmorillonite Nanoparticles

2016

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Background: Adsorption isotherms describe the relationship between the equilibrium concentration of the adsorbed matter in the solution and the amount of adsorbed matter on the surface of the adsorbent. Objectives:The main objective of the present research was to investigate different adsorption isotherms for describing adsorption of humic acid by nanoclay. Methods:In this study, Langmuir, Freundlich, BET, Temkin and Dubinin Radushkevich isotherms, for describing the behavior of humic acid adsorption by bentonite and montmorillonite nanoparticles, were examined. Results:The results showed that due to the regression coefficient (R 2 ), humic acid adsorption on bentonite and montmorillonite nanoparticles has greater compliance with Dubinin Radushkevich isotherms. The value of E or average energy of adsorption for humic acid by bentonite and montmorillonite nanoparticles was 0.17 and 0.15 kJ mol -1 , respectively, which specifies that the type of adsorption of humic acid on both nanoparticles was physisorption. The qmax value obtained from the Dubinin-Radushkevich isotherms, for bentonite and montmorillonite nanoparticles were 27.78 and 28.70 mg/g, respectively.Conclusions: According to the results of this study, bentonite and montmorillonite nanoparticles have a great potential for the removal of humic acid from aqueous solutions.

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“…In this regard, most recent studies presented heterogeneous catalytic ozonation using nano-MgO for toluene removal (29) and UV/nano-CuO for textile wastewater treatment (30). In another study, Kamani et al reported photocatalyst decolorization of C. I. Sulphur Red 14 from solutions by UV/nano-ZnO (31). However, in most of such studies, the assessment of byproduct toxicity was not performed.…”

Section: Resultsmentioning

confidence: 99%

Toxicity of Malathion and Diazinon Byproducts Generated Through the UV/Nano-Zn Process

Khaghani

Zare

2019

Health Scope

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The potential toxicity of diazinon and malathion byproducts had been poorly studied. This study aimed to determine the toxicity of malathion, diazinon, and their byproducts generated through the UV/nano-Zn process. Diazinon and malathion samples were prepared at 1, 5, and 10 mg/L concentrations. In this study, the UV/nano-ZnO process was used for the degradation of these insecticides. The contact times in reactors were 0.5, 1, and 2 h and pH was set at 6, 7, 8, and 9. The dehydrogenase enzyme assay using Nitrobacter and Nitrosomonas bacteria was used for malathion, diazinon, and their byproducts. All tests were prepared in triplicate. The probit analysis in SPSS Ver. 16.0 software was used for the calculation of EC50 (50% effective concentrations). According to the results, byproduct analysis and toxicity assessment were performed in the following situation in the UV/nano-ZnO process: pH 8, contact time of 2 h, initial concentration of 5 mg/L, removal efficiency of diazinon and malathion of 95.4% and 97.5%, respectively. The EC50 values using Nitrobacter and Nitrosomonas were 0.35 and 4.26 mg/L for diazinon and 173.3 and 279.82 mg/L for malathion, respectively. The EC50 values using Nitrobacter and Nitrosomonas were 2.24 and 2.82 mg/L for diazinon byproducts and 28.10 and 197.92 mg/L for malathion byproducts, respectively. This study showed that in some cases the byproducts of diazinon and malathion produced through the UV/nano-ZnO process are more toxic than diazinon and malathion (primary forms). Therefore, it can be suggested that their removal in photo-catalyst processes should be under special caution.

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Photocatalyst Decolorization of C. I. Sulphur Red 14 From Aqueous Solution by UV Irradiation in the Presence of ZnO Nanopowder

Cited by 10 publications

References 21 publications

Photo-Decolourization Kinetics of Acid Red 87 Dye in ZnO Suspension Under Different Types of UV-A Light

Photo-Decolourization Kinetics of Acid Red 87 Dye in ZnO Suspension Under Different Types of UV-A Light

Application of Different Isotherm Models for Humic Acid Adsorption on to Bentonite and Montmorillonite Nanoparticles

Toxicity of Malathion and Diazinon Byproducts Generated Through the UV/Nano-Zn Process

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