Development of standardized method for the quantification of azo dyes by UV-Vis in binary mixtures

García-González, Alcione; Zavala-Arce, Rosa Elvira; Ávila-Pérez, Pedro; Jiménez‐Núñez, M. L.; García-Gaitán, B.; García-Rivas, José Luis

doi:10.1016/j.ab.2020.113897

Cited by 5 publications

(5 citation statements)

References 19 publications

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“…These results indicate that it is possible for azo dyes to be further purified using the column chromatography method thus emerge the potential for using the textile dye extract as the sensitizers in DSSCs. The absorption spectra for azo dyes Yellow 5 (Y5), Blue 1 (B1), and Red 2 (R2) with concentration of 10 mg/L are shown in Figure 1, where the absorbance peaks are 426, 629, and 520 nm, respectively (García-González et al, 2020). These values show that these types of dye have the potential to be used as sensitizers in DSSCs; see also the research by Abdou et al (2013), which showed that coumarin dye with an absorbance peak of 417 nm can be used as a dye in a DSSC.…”

Section: Dssc Fabricationmentioning

confidence: 99%

“…The present narrative review paper reveals the potency of textile-dye extract as a sensitizer in DSSCs. Most of the data used in this review paper are from the paper by Abdou et al (2013), with others from that by García-González et al (2020). The absorbance of textile dyes and the performance of a DSSC using a textile dye reveal the potency of textile-dye extract as a sensitizer in DSSCs.…”

Section: Introductionmentioning

confidence: 99%

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Potential of textile-dye extract as the sensitizer in dye-sensitized solar cells

Perdana¹,

Anugratama

Saputro

et al. 2022

J. Phys.: Theor. Appl.

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<div><p>A dye-sensitized solar cell (DSSC) is a device for converting photons from sunlight into electrical energy. In a DSSC, an important role is played by the dye sensitizer, which absorbs light and injects excitation electrons into the conduction band of a semiconductor oxide. As the sensitizer, complex ruthenium-based dyes provide high conversion efficiency but are expensive and scarce. As alternatives to Ru-based dyes, natural ones extracted from plants are environmentally friendly, inexpensive, and abundant. However, in DSSCs natural dyes are yet to offer higher conversion efficiency than that of complex Ru-based dyes, given low absorption in the visible range and low stability. High-purity textile dyes have been investigated as sensitizers in DSSCs, and dispersive azo dyes for textiles have been purified successfully by column chromatography, with a minimum purity of 97.3%. As such, textile-dye extract could be used as a dye in a DSSC by purifying the former using column chromatography. This article describes research on (i) DSSC fabrication and characterization, (ii) column chromatography for purifying dispersive azo dyes, (iii) the absorbance of several types of textile dye, (iv) the characteristics of the textile dye Remazol Red RB-133, and (v) the performance of a DSSC based on that dye.</p></div>

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Section: Dssc Fabricationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Potential of textile-dye extract as the sensitizer in dye-sensitized solar cells

Perdana¹,

Anugratama

Saputro

et al. 2022

J. Phys.: Theor. Appl.

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“…The dye CI 19140 (Yellow No. 5, tetrazine), which belongs to the azo chromophore group [113,114], has been limited in the European Union in products for children, because it causes them to be hyperactive, and in hair dye products [21,116]. Tetrazine can also lead to dermatitis, anaphylaxis, and itching of the lips and tongue [117].…”

Section: Dyesmentioning

confidence: 99%

Health Effects of Dyes, Minerals, and Vitamins Used in Cosmetics

Wargala

Sławska

Zalewska

et al. 2021

Women

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The average woman uses 12 different cosmetic products every day, but they can have a negative effect on human health. Therefore, in recent years, consumer preferences have changed towards buying natural or ecological cosmetics free from preservatives or unnecessary dyes. The aim of this work is to discuss the use of dyes, minerals, and vitamins in cosmetics in terms of their safety and impact on human health. These substances are very important in the cosmetics industry. Most of them are of natural origin. Some minerals used in the production of face masks or creams are recommended to work against inflammations such as ulcers and acne. Clay minerals have exceptional qualities, among others, low or no toxicity and high bio-compatibility. However, some of them may be harmful. For example, the safety of using talc has been widely debated in recent years. Cosmetic-grade talc cannot contain detectable fibrous asbestos minerals. Moreover, talc should not be applied to the skin when the epidermal barrier is missing or significantly disrupted. The use of talc in cosmetic products in the European Union is restricted. Vitamins are one of the most commonly used, biologically active, and easily accessible components in cosmetics. For example, provitamin B5 (D-panthenol) is a bioactive substance. In cosmetic preparations, it has a softening, repairing, and anti-inflammatory effect and is responsible for regulating sebum secretion. However, some vitamins may be harmful to human health. For example, the use of skin-whitening cosmetics containing vitamin C causes allergic contact dermatitis, whereas the most common adverse effect of topical use of vitamin A is skin irritation, erythema, and peeling. Dyes, which are used to color cosmetics, do not improve the condition of the skin, hair, or nails. Some of them may be harmful to human health. For example, the dye CI 60730 (Acid Violet 43) is prohibited for use in eye products and cosmetics that have contact with mucous membranes. In conclusion, some of the popular cosmetic ingredients discussed in this paper may exert a negative influence on human health, and many of these harmful effects have been discovered recently. Therefore, there is a need for further studies on the possible negative effects of dyes, minerals, and vitamins used in cosmetic products.

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“…Spectrophotometric analysis (spectrophotometry) has various applications and is an effective technique for routine analysis since it is affordable, simple to run, and usable in all laboratories (Ebraheem et al, 2011;Danchana et al, 2019;Ayman et al, 2020). Spectrophotometry is based on the measurement of the absorption of light by the sample under investigation in the visible and near-ultraviolet range (García-González et al, 2020). These analyses rely on the measurement of the absorbance of solutions and are comparative practices based on calibration curves and are practical tools in chemical analysis (Zayed et al, 2017;Marczenko and Balcerzak, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…The most used spectrophotometers are ultraviolet (UV), ultraviolet-visible (UV-VIS), fluorescence, solid-phase, Fourier-transform infrared spectroscopy (FTIR), Raman, and surface-enhanced Raman spectroscopy (SERS) (Dumancas et al, 2017). Among them, UV-VIS spectrophotometer is one of the most common techniques used to determine the concentration of dyes (color) in solutions, as it can measure the intensity of light in the visible spectrum as well as the ultraviolet spectrum (Bunnag et al, 2020;García-González et al, 2020). Visible spectroscopy is a precise and accurate approach in measuring the colors or color mixtures that our eyes detect (Eyring, 2003).…”

Section: Introductionmentioning

confidence: 99%

Object Detection and Regression Based Visible Spectrophotometric Analysis: A Demonstration Using Methylene Blue Solution

Aytaç

2023

ADCAIJ

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This study investigates the estimation of the concentration of methylene blue solutions to understand if visible spectrophotometry could be performed using a smartphone and machine learning. The presented procedure consists of taking photos, detecting test tubes and sampling region of interest (ROI) with YOLOv5, finding the hue, saturation, value (HSV) code of the dominant color in the ROI, and regression. 257 photos were taken for the procedure. The YOLOv5 object detection architecture was trained on 928 images and the highest mAP@05 values were detected as 0.915 in 300 epochs. For automatic ROI sampling, the YOLOv5 detect.py file was edited. The trained YOLOv5 detected 254 out of 257 test tubes and extracted ROIs. The HSV code of the dominant color in the exported ROI images was determined and stored in a csv file together with the concentration values. Subsequently, 25 different regression algorithms were applied to the generated data set. The extra trees regressor was the most generalizing model with 99.5% training and 99.4% validation R2 values. A hyperparameter tuning process was performed on the extra trees regressor and a mixed model was created using the best 3 regression algorithms to improve the R2 value. Finally, all three models were tested on unseen data and the lowest MSE value was found in the untuned extra trees regressor and blended model with values of 0.10564 and 0.16586, respectively. These results prove that visible spectrophotometric analysis can be performed using the presented procedure and that a mobile application can be developed for this purpose.

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Development of standardized method for the quantification of azo dyes by UV-Vis in binary mixtures

Cited by 5 publications

References 19 publications

Potential of textile-dye extract as the sensitizer in dye-sensitized solar cells

Potential of textile-dye extract as the sensitizer in dye-sensitized solar cells

Health Effects of Dyes, Minerals, and Vitamins Used in Cosmetics

Object Detection and Regression Based Visible Spectrophotometric Analysis: A Demonstration Using Methylene Blue Solution

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