Optimization of thermal conditions of sol-gel method for synthesis of TiO2 using RSM and its influence on photodegradation of tartrazine yellow dye

Souza, Isis P.A.F.; Crespo, Lucas H.S.; Spessato, Lucas; Melo, Sandra A.R.; Martins, Alessandro F.; Cazetta, André L.; Almeida, Vitor C.

doi:10.1016/j.jece.2020.104753

Cited by 20 publications

(7 citation statements)

References 38 publications

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“…The PAC was functioned with 10% HCl pretreatment for 30 min to remove the ash, then ultrasound for 2 h and soaked for 48 h. The PAC was filtered immediately, washed using deionized water, and then dried at 80 ℃ oven for 12 h. PAC was sieved out using 300-400 mesh sieves, and stored in a desiccator for use. TiO2/PAC were synthesized by a sol-gel method [24]. In brief, at room temperature, 10 mL of Ti(OBu)4 was dissolved in 40 mL of absolute ethanol, and 6.6 mL of glacial acetic acid was added slowly to the slurry.…”

Section: Synthesis Of Tio2/pacmentioning

confidence: 99%

TiO2-Powdered Activated Carbon (TiO2/PAC) for Removal and Photocatalytic Properties of 2-Methylisoborneol (2-MIB) in Water

Xia-zhen

Zang

et al. 2021

Water

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2-methylisoborneol (2-MIB) is a common taste and odor compound caused by off-flavor secondary metabolites, which represents one of the greatest challenges for drinking water utilities worldwide. A TiO2-coated activated carbon (TiO2/PAC) has been synthesized using the sol-gel method. A new TiO2/PAC photocatalyst has been successfully employed in photodegradation of 2-MIB under UV light irradiation. In addition, the combined results of XRD, SEM-EDX, FTIR and UV-Vis suggested that the nano-TiO2 had been successfully loaded on the surface of PAC. Experimental results of 2-MIB removal indicated that the adsorption capacities of PAC for 2-MIB were higher than that of TiO2/PAC. However, in the natural organic matter (NOM) bearing water, the removal efficiency of 2-MIB by TiO2/PAC and PAC were 97.8% and 65.4%, respectively, under UV light irradiation. Moreover, it was shown that the presence of NOMs had a distinct effect on the removal of MIB by TiO2/PAC and PAC. In addition, a simplified equivalent background compound (SEBC) model could not only be used to describe the competitive adsorption of MIB and NOM, but also represent the photocatalytic process. In comparison to other related studies, there are a few novel composite photocatalysts that could efficiently and rapidly remove MIB by the combination of adsorption and photocatalysis.

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Section: Synthesis Of Tio2/pacmentioning

confidence: 99%

TiO2-Powdered Activated Carbon (TiO2/PAC) for Removal and Photocatalytic Properties of 2-Methylisoborneol (2-MIB) in Water

Xia-zhen

Zang

et al. 2021

Water

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“…According to the literature, this effect is associated with the presence of protons in the medium, which can be a scavenger of OH radicals under highly acidic conditions, thus inhibiting the degradation process of the contaminant [31][32][33]. With the increase of pH to 6 and free pH, the TY degradation process was obviously inhibited, as at higher pH the H 2 O 2 quickly decomposes into molecular oxygen and H 2 O, but does not transform into hydroxyl radicals, losing its oxidizing capacity (Xia et al 2011).…”

Section: In Uence Of the Solution Initial Phmentioning

confidence: 99%

“…The e ciency of the heterogeneous oxidation process was evaluated by examining the in uence of some of the main operating parameters, such as pH, H 2 O 2 , and catalyst reuse. The chosen contaminant was the TY dye, an azo dye used by the food industry to promote the yellow color in products, and it has a complex aromatic structure and stability, which characterizes it as a dangerous compound for the environment and conventional biological treatment methods are ineffective for its degradation (Souza et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Photo-Fenton Oxidative System for Removing Tartrazine Yellow Dye in Aqueous Medium Using Y-fe Zeolite As Catalyst

Nippes

Macruz

Molina

et al. 2021

Preprint

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The synthesis and application of heterogeneous solid catalysts in Fenton-type processes have been shown to be a promising alternative for the removal of hazardous pollutants. In this context, the aim of this study was to prepare and characterize a heterogeneous solid iron catalyst supported on zeolite Y for the degradation of yellow food coloring tartrazine (TY). The catalyst was produced through humid ion exchange and characterized by the physisorption of N2, XRD, SEM, TEM and EDX. The efficiency of the catalyst was evaluated through the degradation of tartrazine yellow dye in a batch regime, and the influence of some of the main operational parameters was also evaluated. The characterizations confirmed the presence of iron on the surface of zeolite Y and the increase in the specific area and pore volume after ion exchange. The catalyst used in the photo-Fenton system was extremely efficient, with a removal of approximately 98% in 120 min in the experimental conditions: [TY]0 = 10 mg/L, [H2O2]0 =200 g/L, Y-Fe dosage=1.5 g/L and pH= 3.0. It was possible to recover the catalyst and use it in five reuse cycles, showing its stability and potential application of this catalyst in heterogeneous photo-Fenton systems.

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“…RSM is considered a mathematical model that can accurately reveal study the relationship between various factors and response values [24][25][26]. It can quickly and effectively determine the best conditions for a multi-factor system [27][28][29]. A five-level, three-factor CCD technique was employed to optimize the independent process variables.…”

Section: Design Of Experimental Condition Using Rsmmentioning

confidence: 99%

“…Analysis of the data through ANOVA shows the analysis of variance, the significance of variance test, and the first-order coefficient significance test regression equation. The reliability of the model is tested [28][29][30][31].…”

Section: Design Of Experimental Condition Using Rsmmentioning

confidence: 99%

Wax Separated Effectively from Fischer-Tropsch Wax Residue by Solvent Desorption: Thermodynamic and Kinetic Analysis

Zheng

et al. 2021

Applied Sciences

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The separation and recycling of effective resources in Fischer-Tropsch wax residue (FTWR) are urgent because of the environmental hazards and energy waste they bring. In this study, organic solvents are used to separate recyclable resources from FTWR efficiently, achieving the goals of “Energy Recycle” and “Fisher-Tropsch Wax Residue Treatment”. The response surface methodology (RSM) response surface analysis model accurately evaluates the relationship among temperature, residence time, liquid–solid ratio, and desorption rate and obtains the best process parameters. The results show that the product yield can reach 82.28% under the conditions of 80 °C, 4 h, and the liquid–solid ratio of 24.4 mL/g. Through the kinetic analysis of the desorption process of FTWR, the results show that the desorption process conforms to the pseudo second-order kinetic model and the internal diffusion model. The thermodynamic function results showed that there were not only van der Waals forces in the desorption process, but other strong interaction forces such as hydrogen bonds. In addition, Langmuir, Freundlich, and BET equations are used to describe the desorption equilibrium. Scanning electron microscopy (SEM) were used to analyze the pore structure of FTWR during desorption. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and Gas chromatography-mass spectrometer (GC-MS) analysis confirmed that the desorption product’s main component was hydrocarbons (50.38 wt%). Furthermore, naphthenic (22.95 wt%), primary alcohol (11.62 wt%), esters (8.7 wt%), and aromatic hydrocarbons (6.35 wt%) compounds were found and can be further purified and applied to other industrial fields. This study shows that using petroleum ether to separate and recover clean resources from Fischer-Tropsch wax residue is feasible and efficient and has potential industrial application prospects.

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Optimization of thermal conditions of sol-gel method for synthesis of TiO2 using RSM and its influence on photodegradation of tartrazine yellow dye

Cited by 20 publications

References 38 publications

TiO2-Powdered Activated Carbon (TiO2/PAC) for Removal and Photocatalytic Properties of 2-Methylisoborneol (2-MIB) in Water

TiO2-Powdered Activated Carbon (TiO2/PAC) for Removal and Photocatalytic Properties of 2-Methylisoborneol (2-MIB) in Water

Photo-Fenton Oxidative System for Removing Tartrazine Yellow Dye in Aqueous Medium Using Y-fe Zeolite As Catalyst

Wax Separated Effectively from Fischer-Tropsch Wax Residue by Solvent Desorption: Thermodynamic and Kinetic Analysis

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