Photocatalytic treatment of wastewater containing Rhodamine B dye via Nb2O5 nanoparticles: effect of operational key parameters

Hashemzadeh, Fatemeh; Rahimi, Rahmatollah; Gaffarinejad, Ali; Jalalat, Vahideh; Safapour, Siyamak

doi:10.1080/19443994.2014.936516

Cited by 10 publications

(7 citation statements)

References 46 publications

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“…and MO, the adsorbed percentages and subsequent photoreaction's rates at low pH were larger than those at high pH. As it is known and has been mentioned in our previous publications [9,10,17,35], the point of zero charge (PZC) pH (pH pzc ) is the pH value at which the net electric charge of a molecule is zero and this pH value greatly influences the adsorption of pollutant substrates and intermediates on the surface of a photocatalyst during a photoreaction. Therefore, in order to find out optimal pH for the simultaneous photoreduction of Cr(VI) and decolorization of MO, the pH pzc of NiNb0.4 catalyst was measured by the so-called zeta-potential method [58].…”

Section: Photocatalytic Reactions Of Ninb04 As the Most Active Photomentioning

confidence: 95%

“…The simultaneous photocatalytic reduction of Cr(VI) and decolorization of MO under visible light irradiation were carried out in a reactor used in our previous studies [9,10,17].…”

Section: Photocatalytic Experimentsmentioning

confidence: 99%

“…Various methods have been developed to reduce Cr(VI) or remove the organic dye pollutants from industrial waste waters, e.g., filtration, coagulation-flocculation, reverse osmosis, biological treatment, active carbon adsorption, distillation and photocatalysis etc. [11][12][13][14][15][16][17]. All the above techniques have their advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 96%

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Porous p-NiO/n-Nb2O5 nanocomposites prepared by an EISA route with enhanced photocatalytic activity in simultaneous Cr(VI) reduction and methyl orange decolorization under visible light irradiation

Hashemzadeh

Gaffarinejad

Rahimi

2015

Journal of Hazardous Materials

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Section: Photocatalytic Reactions Of Ninb04 As the Most Active Photomentioning

confidence: 95%

“…The simultaneous photocatalytic reduction of Cr(VI) and decolorization of MO under visible light irradiation were carried out in a reactor used in our previous studies [9,10,17].…”

Section: Photocatalytic Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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Porous p-NiO/n-Nb2O5 nanocomposites prepared by an EISA route with enhanced photocatalytic activity in simultaneous Cr(VI) reduction and methyl orange decolorization under visible light irradiation

Hashemzadeh

Gaffarinejad

Rahimi

2015

Journal of Hazardous Materials

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“…This metal oxide is also a promising catalyst for oxidation processes with the use of hydrogen peroxide as oxidant because it activates H 2 O 2 to form ROS such as hydroxyl radicals (•OH), superoxide radical anions (O 2 •−) and peroxo species (O 2 2− ), which are highly active in the oxidation of organic compounds [ 53 , 54 , 55 , 56 ]. The high activity of niobia in both photocatalytic and Fenton-like processes makes it possible to use niobium in hybrid water treatment technologies [ 50 , 57 ]. A combination of photocatalytic and Fenton-like processes over Nb 2 O 5 allowed much higher efficiency of rhodamine discoloration than that observed for the less complex processes with the use of light or hydrogen peroxide only.…”

Section: Introductionmentioning

confidence: 99%

Niobium: The Focus on Catalytic Application in the Conversion of Biomass and Biomass Derivatives

et al. 2023

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The world scenario regarding consumption and demand for products based on fossil fuels has demonstrated the imperative need to develop new technologies capable of using renewable resources. In this context, the use of biomass to obtain chemical intermediates and fuels has emerged as an important area of research in recent years, since it is a renewable source of carbon in great abundance. It has the benefit of not contributing to the additional emission of greenhouse gases since the CO2 released during the energy conversion process is consumed by it through photosynthesis. In the presented review, the authors provide an update of the literature in the field of biomass transformation with the use of niobium-containing catalysts, emphasizing the versatility of niobium compounds for the conversion of different types of biomass.

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“…Consequently, there is a growing tendency to use natural dyes in textile dyeing because of their sustainability, green chemistry, and improved ecological balance . It is evident that natural dyes are more environmentally friendly than synthetic dyes, have better biodegradability, and are more compatible with the environment .…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and kinetic studies of the adsorption behaviour of the natural dye cochineal on polyamide 66

Sadeghi‐Kiakhani

Safapour

Mirnezhad

2018

Coloration Technology

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The adsorption behaviour of the natural dye cochineal on polyamide 66 was studied at different pH values. The thermodynamic and kinetic parameters such as standard affinity (−Δμ˚), changes in enthalpy (ΔH˚) and entropy (ΔS˚), diffusion coefficient and activation energy of the diffusion, were determined for pH values of 3 and 6. Results indicated that the experimental data fitted appropriately with the Nernst isotherm. Furthermore, the partitioning ratio and −Δμ˚ decreased significantly with increasing temperature, and it was revealed that the adsorption of cochineal onto polyamide was an exothermic process. The −Δμ˚ value of polyamide dyed at pH 3 was higher than that dyed at pH 6. This is related to higher numbers of electrostatic and non‐electrostatic interactions between cochineal and polyamide at pH 3, whereas at pH 6 non‐electrostatic hydrophobic interactions between cochineal and polyamide are dominant. At pH 6 comparatively higher negative values for ΔH˚ and ΔS˚ were obtained. The diffusion coefficient increased with rises in temperature. The polyamide dyed at pH 3 had a higher diffusion coefficient at every temperature than the polyamide dyed at pH 6. The dyeing rate for polyamide at pH 3 was higher than at pH 6 and reached equilibrium in a shorter time. Furthermore, a lower activation energy of diffusion was obtained at pH 3 compared to pH 6.

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Photocatalytic treatment of wastewater containing Rhodamine B dye via Nb2O5 nanoparticles: effect of operational key parameters

Cited by 10 publications

References 46 publications

Porous p-NiO/n-Nb2O5 nanocomposites prepared by an EISA route with enhanced photocatalytic activity in simultaneous Cr(VI) reduction and methyl orange decolorization under visible light irradiation

Porous p-NiO/n-Nb2O5 nanocomposites prepared by an EISA route with enhanced photocatalytic activity in simultaneous Cr(VI) reduction and methyl orange decolorization under visible light irradiation

Niobium: The Focus on Catalytic Application in the Conversion of Biomass and Biomass Derivatives

Thermodynamic and kinetic studies of the adsorption behaviour of the natural dye cochineal on polyamide 66

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