scholarly journals Green Miles in Dyeing Technology Metal-Rich Pumpkin Extracts in Aid of Natural Dyes

2021 ◽  
Author(s):  
Mozhgan Hosseinnezhad ◽  
Kamaladin Gharanjig ◽  
Narjes Razani ◽  
Razieh Jafari ◽  
Mohammad Reza Saeb
Keyword(s):  
Environmental Pollution ◽  
First Generation ◽  
Natural Fibers ◽  
Natural Dye ◽  
Natural Dyes ◽  
Natural Source ◽  
Complex Structures ◽  
Wool Fibers ◽  
The Common ◽  
Natural Mordant

Abstract To reduce environmental pollution, it is essential to use green processes in dyeing and meet its requirements. One of the common methods to get better results in dyeing is to use mordant. To get a green dyeing, using natural mordant (bio-mordant) is very effective, but the search for an alternative having a higher stability and absorption interval, along with an absolute affinity towards natural fibers of various kinds was central to the focus of studies in the meanwhile. Pumpkin extract as a natural source metal-rich can be used as a bio-mordant in green dyeing of natural fibers such as wool fibers. Two natural dyes native to Iran; Reseda luteolaare and Madder were employed in this study. The effectiveness of bio-mordant presence on fibers was evaluated by FTIR-ATR test from mordanted and mordanted-dyed wool samples. Fastness performance of wool dyes with pumpkin alternated from good to excellent depending on natural dye type and concentration, due to the formation of complex structures that compensated for the lack of affinity-characteristic of tannin-based first-generation biomordants, at best with good fastness.

scholarly journals NATURAL DYES EXTRACTED FROM WASTE LEAVES OF TERMINALIA CATAPPA LOCALLY KNOWN AS TROPICAL ALMOND AND ITS APPLICATION ON SILK FABRICS PRETREATED WITH ECO FRIENDLY AND NONECO-FRIENDLY MORDANTS

2017 ◽  
Vol 5 (5) ◽  
pp. 125-137 ◽  
Author(s):  
Yogesh Vadwala ◽  
Namrita Kola
Keyword(s):  
Natural Resources ◽  
Environmental Pollution ◽  
Waste Product ◽  
Natural Dye ◽  
Natural Dyes ◽  
Synthetic Dyes ◽  
Fastness Properties ◽  
Terminalia Catappa ◽  
Silk Fabrics ◽  
Dyes And Pigments

The use of non-toxic and eco-friendly natural dyes on textiles has become a matter of significant importance because of the increased environmental awareness in order to avoid some synthetic dyes. Synthetic dyes are hazardous and carcinogenic and also release vast amount of pollutant in the environment during their manufacture and application, thus revival of natural dyeing techniques as one of the alternative is being emphasized for this purpose. Most effective ways for reducing environmental pollution is the replacement of polluting materials and chemicals by eco-friendly natural materials. Many natural resources which are being wasted indiscriminately or thrown away as a waste product contain useful dyes and pigments. In the present study, natural dye extracted from the waste leaves of Terminalia Catappa (tropical almond) and its application on silk fabrics pretreated with eco-friendly and non-eco-friendly mordants have been carried out successfully. Different shades with excellent to good fastness properties have been obtained.

Studies on the Effect of Sinapic Acid on Silk Fabric Printing with Sorghum Red

2013 ◽  
Vol 796 ◽  
pp. 395-399 ◽  
Author(s):  
Xi Chun Dai ◽  
Zhi Wei Hang ◽  
Xiang Rong Wang
Keyword(s):  
Guar Gum ◽  
Sinapic Acid ◽  
Natural Dye ◽  
Natural Dyes ◽  
Saturated Steam ◽  
Silk Fabric ◽  
Light Fastness ◽  
Wash Fastness

In order to improve fastness of printing silk fabric with natural dyes, the influence of sinapic acid on printing of silk fabric with sorghum red was investigated in this work. The silk fabric was printed using guar gum as paste, sorghum red as natural dye, sinapic acid as auxiliaries. The appropriate steaming condition was the temperature 100°C, time 15min and saturated steam. The results showed that the light fastness and the wash fastness of the printed fabric were improved by the addition of sinapic acid. It is proposed that sinapic acid can be applied as effective fastness improver of natural dyes.

Utilization of Old Coconut (Cocos nucifera) Husk Waste as Potential Source of Natural Dye and its Dyeing Properties on Cotton Cloth

2021 ◽  
Vol 882 ◽  
pp. 280-286
Author(s):  
Aris Sugih Arto Kholil ◽  
Husniyyah Ulfah Adani ◽  
Annisa’ Mufsihah ◽  
Achmad Chafidz
Keyword(s):  
Cocos Nucifera ◽  
Natural Dye ◽  
Natural Dyes ◽  
Cotton Cloth ◽  
Color Fastness ◽  
Fastness Properties ◽  
Binding Agent ◽  
Binding Agents ◽  
Colored Cotton ◽  
Brown Color

Coconut husk is considered waste and its fibers can be used as a source of natural dyes for textiles. The objective of this research is to obtain natural dyes from old coconut (Cocos nucifera) husk waste fibers through the extraction process. Brown color was produced in the liquid-liquid extraction method. The brown color natural dyes were then used to dye cotton cloth. Three different binding agents were used during the fixation process, i.e. tunjung, naphtol salt, and alum. The coloring results of the natural dye on the cotton cloth were as follow: with alum binding agent the resulting color was light brown (cream), whereas tunjung binding agent produced a greenish brown color, and using napthol salt binding agent produced yellow color. The colored cotton cloths were tested for their color fastness properties against rubbing, soap washing, and sunlight exposure. The measurement scale used was grey scales, which was used to evaluate the color change (color fading) and color staining (color transfer) during color fastness testing. In general, based on the results, the colored cotton cloth using alum as binding agent showed better color fastness properties against rubbing, soap washing, and sunlight exposure compared to the ones using tunjung and naphtol salt binding agents.

scholarly journals Natural Dyes: From Cotton Fabrics to Solar Cells

2021 ◽  
Author(s):  
Indriana Kartini ◽  
Adhi Dwi Hatmanto
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Cotton Fabrics ◽  
Natural Dye ◽  
Natural Dyes ◽  
Oxide Surface ◽  
Solar Cell Efficiency ◽  
Cell Efficiency ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

This article will discuss natural dyes’ role, from colouring the cotton fabrics with some functionality to harvesting sunlight in the dye-sensitized solar cells. Natural dye colourants are identical to the low light- and wash-fastness. Therefore, an approach to improving the colourant’s physical properties is necessary. Colouring steps employing silica nanosol and chitosan will be presented. The first part will be these multifunctional natural dye coatings on cotton fabrics. Then, functionality such as hydrophobic surfaces natural dyed cotton fabrics will be discussed. Natural dyes are also potential for electronic application, such as solar cells. So, the second part will present natural dyes as the photosensitizers for solar cells. The dyes are adsorbed on a semiconductor oxide surface, such as TiO2 as the photoanode. Electrochemical study to explore natural dyes’ potential as sensitizer will be discussed, for example, natural dyes for Batik. Ideas in improving solar cell efficiency will be discussed by altering the photoanode’s morphology. The ideas to couple the natural dyes with an organic–inorganic hybrid of perovskite and carbon dots are then envisaged.

scholarly journals Ekstraksi dan Uji Stabilitas Zat Warna Alami dari Bayam Merah (Alternanthera amoena Voss)

KOVALEN ◽  
2020 ◽  
Vol 6 (3) ◽  
pp. 212-217
Author(s):  
Khairuddin ◽  
Joy Noldy Baciang ◽  
Indriani ◽  
Nov Irmawati Inda
Keyword(s):  
Sun Exposure ◽  
Natural Dye ◽  
Natural Dyes ◽  
Stability Test ◽  
Stability Testing ◽  
Effect Of Ph ◽  
Color Degradation ◽  
The Stability ◽  
Better Than

Research on the extraction and stability test of natural dye from red spinach (Alternanthera amoena Voss) has been carried out. This study aims to determine the effect of pH and length of sun exposure on the stability of the dye from red spinach. Extraction using the maceration method with ethanol solvent and measurement using a UV-Vis spectrophotometer. Stability testing is carried out at pH 2-5 and sun exposure for 1-4 hours using a dark and light container. The results obtained, at pH 2 and pH 3, anthocyanins were more stable, compared to pH 4 and 5 which had greater color degradation. In exposure to sunlight, dark containers with a degradation percentage of 31.70% were better than clear containers with a percentage of 48.78%. Keywords: Anthocyanin, red spinach, natural dyes stability.

Ecological Chemistry Through Popular Scientific Articles

2020 ◽  
pp. 531-542
Author(s):  
Ketevan Kupatadze
Keyword(s):  
Environmental Pollution ◽  
Student Motivation ◽  
Online Journal ◽  
Ecological Chemistry ◽  
The Common

Popularization of ecological chemistry is the aim of scientific-popular articles, which are published in the online journal for teachers. The articles of this type ecological chemistry are linked with literature and history. Due to this linkage, this module turns into an easily comprehensible one and it becomes fun. In all articles, there is also included very useful and interesting information pertaining to ecological chemistry. The titles of such articles must be underlined because they should not only show the common meaning of article, but they should also attract readers. The utmost interest is generated by the historical papers where chemical issues are connected with history. The period of alchemy is more popular and that's why the alchemical stories are described in the articles. The outcome of the pedagogical experiment has made it clear that such a method of teaching of ecological chemistry with scientific popular articles affects positively school student motivation and changes their attitude towards environmental pollution.

scholarly journals Organized Framework of Main Possible Applications of Sheep Wool Fibers in Building Components

2020 ◽  
Vol 12 (3) ◽  
pp. 761 ◽  
Author(s):  
Monica C.M. Parlato ◽  
Simona M.C. Porto
Keyword(s):  
Bacterial Load ◽  
Natural Fibers ◽  
Green Building ◽  
Production Costs ◽  
Acoustic Properties ◽  
Wool Fibers ◽  
Rural Buildings ◽  
Building Components ◽  
High Bacterial Load ◽  
Sheep Wool

Greasy sheep wool is currently considered a special waste for its high bacterial load, with expensive disposal costs for sheep breeders. For this reason, wool is often burned or buried, with serious consequences for the environment. On the other hand, sheep wool is well regarded as one of the most performative insulating natural fibers due to its thermo-hygrometric and acoustic properties. In the building sector, sheep wool meets the requirements of green building components because it is an eco-friendly material, there is a surplus of it, it is annually renewable, and totally recyclable. If used instead of common insulation materials (e.g., fiberglass, rock wool, polyurethane foam, polystyrene), sheep wool offers significant benefits for sustainability such as a reduction in the production costs for new insulating materials and in environmental pollution. Mechanical and physical properties of sheep wool investigated in previous studies were assessed and discussed with the aim of providing an organized framework of possible applications of wool fibers in building components. This paper highlights in detail aspects that have not yet been investigated enough to detect new potential uses of sheep wool fibers in rural buildings and the reuse of traditional ones.

scholarly journals Does Over-the-Counter Purchase of Antihistamines by Residents of Dhaka City, Bangladesh Align with the Prescribing Choices of the Physicians Practicing in That City?

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Somaia H. Chadni ◽  
Md. H. A. Banna ◽  
Nafisa N. Mollick ◽  
Md. R. I. Rupam ◽  
Sharmin Sultana ◽  
...  
Keyword(s):  
Work Performance ◽  
First Generation ◽  
Second Generation ◽  
Rank Correlation ◽  
Dhaka City ◽  
Over The Counter ◽  
Exact Test ◽  
Correlation Test ◽  
Significant Difference ◽  
The Common

Most current guidelines recommend prescribing second-generation antihistamines (SGAs) over first-generation antihistamines because SGAs are less likely to cause sedation and impairment of heavy work performance. However, common residents who use these antihistamines as over-the-counter (OTC) medicines are less likely to know that. So, this study was designed to compare the over-the-counter use of antihistamines by common residents with the prescribing preferences of physicians residing at Dhaka City, Bangladesh. Between June and August of 2017, a total of 100 Physicians from some of the top medical institutions of the city and 350 randomly selected common residents were directly interviewed with two separate semistructured questionnaires specifically designed for each population. Data was statistically analyzed using Fischer’s exact test, Spearman’s rank correlation test and Kendall’s tau rank correlation test. The data shows that physicians prefer second-generation antihistamines with fexofenadine (48.09% of the total responses), desloratadine (16.03%), and rupatadine (13.74%) taking the top spots. Cetirizine (29.46% of total responses), desloratadine (14.73%), and chlorpheniramine (14.52%) were the most used OTC antihistamines by the common residents. Statistical analysis with Fischer’s exact test revealed that the difference in preference of first-generation antihistamines between physicians and common residents were extremely significant (p<0.0001). Furthermore, cetirizine (which is known to have some degree of sedating activity) and chlorpheniramine are more preferred among common residents than among physicians (extremely significant difference, p<0.0001 in both cases). The study concludes that physicians of Dhaka City are complying with practice guidelines, but sedating antihistamines still retain some popularity among the common residents. Hence, a more engaging community pharmacy is needed to minimize adverse effects that can arise from OTC use of sedating antihistamines.

Investigation of the photoinduced electron injection processes for natural dye-sensitized solar cells: the impact of anchoring groups

RSC Advances ◽  
2016 ◽  
Vol 6 (88) ◽  
pp. 85125-85134 ◽  
Author(s):  
S. Akın ◽  
S. Açıkgöz ◽  
M. Gülen ◽  
C. Akyürek ◽  
S. Sönmezoğlu
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Electron Injection ◽  
Natural Dye ◽  
Natural Dyes ◽  
Dye Sensitized ◽  
Photovoltaic Parameters ◽  
Anchoring Groups ◽  
The Impact ◽  
Sensitized Solar Cells

In this study, nine different natural dyes having various anchoring groups were extracted from various plants and used as photo-sensitizers in DSSC applications. The photovoltaic parameters were investigated as a function of these anchoring groups.

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