Research Unit of Applied Chemistry and Environment

Monastir, Tunisia

Research Unit of Applied Chemistry and Environment

Monastir, Tunisia
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Ben Ticha M.,Research Unit of Applied Chemistry and Environment | Meksi N.,Research Unit of Applied Chemistry and Environment | Meksi N.,Higher Institute of Fashion of Monastir | Kechida M.,Textile Industrial Company SITEX | Mhenni M.F.,Research Unit of Applied Chemistry and Environment
International Journal of Environmental Research | Year: 2013

Textile Industries use different chemicals in indigo dyeing processes. Interest in eco-friendly processing in the textile industry has recently increased because of a larger awareness of environmental issues. For the case of indigo dyeing process, the reducing agent conventionally used is the - environmentally unfavourable - sodium dithionite, which will be replaced in this study with an ecological reducing agent called acetol that is also known as hydroxyacetone. In this paper, measurements of the redox potential at various experimental conditions were carried out in a dyeing bath, where acetol is the reducing agent of indigo. Moreover, an unconventional but eco-friendly indigo dyeing process of cotton was investigated. The effects of: reduction duration, dyeing duration, reduction temperature, alkalinity and the amount of indigo on the performances of this dyeing process were studied, and the dyeing results were evaluated by measuring the colour yield parameter (K/S) of the dyed samples at 660 nm. Finally, a factorial design was employed for the experimental plan; mathematical model equation and statistical analysis were derived by computer simulation applying the least squares method using Minitab 15.


Meksi N.,Research Unit of Applied Chemistry and Environment | Meksi N.,Higher Institute of Fashion of Monastir | Ben Ticha M.,Research Unit of Applied Chemistry and Environment | Kechida M.,Societe Industrielle des Textiles SITEX | Mhenni M.F.,Research Unit of Applied Chemistry and Environment
Journal of Cleaner Production | Year: 2012

Nowadays, in most indigo dyeing processes the reduction step is performed chemically by sodium dithionite. This is considered environmentally unfavourable because of the resultant contaminated wastewaters. So, there has been interest to find new possibilities which would be ecologically more attractive to reduce indigo. In this paper, a comparison between sodium dithionite and some ecofriendly α-hydroxycarbonyls was effectuated. The examples of glucose (such as an α-hydroxyaldehyde), acetol and acetoin (such as an α-hydroxycetone) were treated. This comparison was based on redox potential measurements taken in absence and in presence of indigo under several conditions of temperatures, molar concentrations of studied reducing agents and sodium hydroxide. A thermodynamic study was also released in order to evaluate more precisely the reducing properties of each reductant by calculating the equilibrium constant of reduction reaction "Kr". The dyeing performances resulted from the reduction of indigo by each one of the studied reducing agents were appreciated by measuring the colour yield (K/S). The obtained results showed that α-hydroxycarbonyls could offer an environmentally safe alternative to sodium dithionite as a reducing agent in indigo dyeing processes. © 2011 Elsevier Ltd. All rights reserved.


Ben Ticha M.,Research Unit of Applied Chemistry and Environment | Meksi N.,Research Unit of Applied Chemistry and Environment | Meksi N.,Higher Institute of Fashion of Monastir | Drira N.,Research Unit of Applied Chemistry and Environment | And 2 more authors.
Industrial Crops and Products | Year: 2013

The present paper investigates a non conventional but eco-friendly exhaust dyeing process of cotton with indigo. During this process, indigo was converted to its water-soluble leuco form by a green reducing agent: the glucose, in presence of alkali and at high temperature. To improve the exhaust dyeing process, the dyeing step was carried out on modified cotton by several cationizing agents. Modified cotton fibres were characterized by Fourier transform infrared (FTIR) spectra and an X-ray diffraction analysis. The performances of the dyeing process were evaluated by measuring the bath exhaustion E (%), the colour yield (K/. S), the brightness index BI (%) and the dyeing fastnesses of the coloured cotton. It was found that the colour yield and the brightness obtained from the exhaustion dyeing were improved when using cationized cotton giving fastness properties better than those obtained with untreated cotton dyed by the conventional process. The effect of the main operating conditions (cationizing agent nature and concentration, reducing temperature, dyeing duration, dyeing temperature) on the quality of this dyeing process were also studied. A surface design was employed for experimental design and optimization of results. Mathematical model equation and statistical analysis were derived by computer simulation programming applying the least squares method using Minitab 15. © 2013 Elsevier B.V.


Meksi N.,Research Unit of Applied Chemistry and Environment | Meksi N.,Higher Institute of Fashion of Monastir | Ben Ticha M.,Research Unit of Applied Chemistry and Environment | Kechida M.,Societe Industrielle des Textiles SITEX | Mhenni M.F.,Research Unit of Applied Chemistry and Environment
Industrial and Engineering Chemistry Research | Year: 2010

In the borohydride dyeing process, indigo cannot be reduced by sodium borohydride to its reduced form without the addition of catalyst. This catalyst, which is a metallic salt, is used to activate the reduction procedure of the reducing agent. So, the reduction reaction of indigo depends significantly on the nature of this catalyst. In this paper, the effect of 12 different metallic salts on the performances of the indigo reduction reaction has been discussed. These performances were evaluated by measuring the indigo reduction yield as well as the color yield (K/S) of the dyed samples of cotton. In these studies, it was found that the copper-based catalysts were the best and offered maximum performance. © 2010 American Chemical Society.


Bouatay F.,Research Unit of Applied Chemistry and Environment | Meksi N.,Research Unit of Applied Chemistry and Environment | Meksi N.,Higher Institute of Fashion of Monastir | Adeel S.,Government College University at Faisalabad | And 2 more authors.
Journal of Natural Fibers | Year: 2016

The aim of this study is to improve the dyeing behavior of cotton and jute fibers using natural product as surface modifying agents to the cationic dyes. Surface modifications have been performed on both cellulosic and jute used in this work by different types of chemical and natural products. Present study has been concerned with the evaluation of dyeing quality by controlling the percentage of dye bath exhaustion, the color yield (k/s) and the color fastness to light, washing and rubbing. In addition, optimization dyeing process was performed using a surface design with the help of Minitab 15 Software. © 2016 Taylor & Francis.


Haddar W.,Research Unit of Applied Chemistry and Environment | Haddar W.,Higher Institute of Technological Studies | Baaka N.,Research Unit of Applied Chemistry and Environment | Meksi N.,Research Unit of Applied Chemistry and Environment | And 5 more authors.
Fibers and Polymers | Year: 2015

The present study reports the valorization of the olive vegetable water in natural dyeing. HPLC analysis of the phenolic extract obtained from the used olive vegetable water showed that the predominant flavonoid compounds were luteolin and apigenin. Hydroxytyrosol and various phenolic acids were also identified. This abundant waste was used as a possible dye bath for dyeing polyamide fabrics in conventional and ultrasonic techniques. It was found that these synthetic fibers possess high affinity to the olive vegetable water giving brownish shades with generally good fastness properties. Factors affecting the dyeing performances such as pH, temperature, and duration of the dyeing time were studied. Ultrasonic dyeing showed marked improvement in the dye uptake compared to the conventional heating. The results also showed that the use of this method enhanced some fastness properties compared to the conventional method. Moreover, it was found that using ultrasonic technique can reduce the concentration of polyphenols so that it reduced the chemical oxygen demand COD and biological oxygen demand BOD5 better than conventional heating method. © 2015, The Korean Fiber Society and Springer Science+Business Media Dordrecht.


Haddar W.,Research Unit of Applied Chemistry and Environment | Baaka N.,Research Unit of Applied Chemistry and Environment | Meksi N.,Research Unit of Applied Chemistry and Environment | Meksi N.,Higher Institute of Fashion of Monastir | And 2 more authors.
Journal of Cleaner Production | Year: 2014

The olive oil industry releases considerable amounts of wastewater which contains huge reserves of natural dyes. Such wastewater could successfully be used for the dyeing of acrylic fibers. The influence of the main dyeing conditions (material/liquor ratio, dye bath pH, dyeing duration, dyeing temperature) on the performances of this dyeing process were studied. The dyeing performances of this process were appreciated by measuring the color yield (K/S) and the fastness properties of the dyed samples. A 24 full factorial design method was employed in order to study the interactions between the selected dyeing process parameters and to evaluate the optimal dyeing conditions. The optimization of these dyeing process factors to obtain maximum color yield was carried out by incorporating effect plots, normal probability plots, interaction plots, analysis of variance (ANOVA) and Pareto charts. A regression model was formulated using Minitab software and fitted the experimental data very well. In addition, it was found that dyeing of acrylic enables to reduce the concentration of polyphenols so that it reduced the Chemical oxygen demand COD. Furthermore, the biodegradability ratio (COD/BOD5) decreases but it was always superior to 3 which means that this aqueous waste still not biodegradable. It was also found that reusing the residual bath allowed to obtain a depth of shade very similar to the first dyeing and reduced considerably the environmental parameters (the concentration of polyphénols and COD). © 2013 Elsevier Ltd. All rights reserved.


Haddar W.,Research Unit of Applied Chemistry and Environment | Elksibi I.,Research Unit of Applied Chemistry and Environment | Meksi N.,Research Unit of Applied Chemistry and Environment | Meksi N.,Higher Institute of Fashion of Monastir | Mhenni M.F.,Research Unit of Applied Chemistry and Environment
Industrial Crops and Products | Year: 2014

Dyes obtained from different natural sources have emerged as an important alternative to synthetic dyes due to their negative ecotoxicological effects on the environment. In this study, natural colourant from the leaves of fennel (Foeniculum vulgare) was valorized in the dyeing of cationized cotton fabrics. The influence of the main dyeing conditions (dye bath pH, dyeing temperature, and dyeing duration) on the performances of this dyeing process was studied. The dyeing performances of this process were appreciated by measuring the colour yield (K/S) and the fastness properties of the dyed samples. A surface design with the help of Minitab 15 software was used for optimization of the dyeing process and evaluation of interaction effects of different operating parameters. The optimum conditions for dyeing process were found to be pH of 8.22, dyeing temperature of 99.83°C and dyeing duration of 59.38min. In addition, it was found that the dye bath of cationized cotton with Croscolor DRT absorbed polyphenols compounds and reduced the Biological Oxygen Demand COD and BOD5 of the dyeing bath. © 2013 Elsevier B.V.


Ksibi I.E.,Research Unit of Applied Chemistry and Environment | Slama R.B.,University of Monastir | Faidi K.,Research Unit of Applied Chemistry and Environment | Ticha M.B.,Research Unit of Applied Chemistry and Environment | M'henni M.F.,Research Unit of Applied Chemistry and Environment
Industrial Crops and Products | Year: 2015

The aim of this study was to investigate whether complexly constituted phenolics extracts from pepper waste may be utilized for the recovery of natural colored preparations.At first, different solvents mixture were compared to determine the best solvent for extraction of phenolic compounds from pepper by-product. The three solvents ethanol, acetone and water were used. The total phenolic content (TPC), the total flavonoid content (TFC) and the relative color strength (. K/. S) were studied using a simplex-centroid design. Acetone-water (68-32%) with 224. mg/L for total phenolic content and acetone-water (61-38%) with 0.446. mg/L for total flavonoid content were the best solvent mixtures for the extraction.The colored extract of pepper by-products was applied on woolen fabrics to investigate the dyeing characteristics and antimicrobial efficacy against common human pathogens such as Pseudomonas aeruginosa and Staphylococcus aureus. The results indicate that extract can be applied on woolen fabrics to produce colored clothing and textiles with acceptable antimicrobial properties. © 2015 Elsevier B.V.


Elksibi I.,Research Unit of Applied Chemistry and Environment | Haddar W.,Research Unit of Applied Chemistry and Environment | Ben Ticha M.,Research Unit of Applied Chemistry and Environment | Gharbi R.,Research Unit of Applied Chemistry and Environment | Mhenni M.F.,Research Unit of Applied Chemistry and Environment
Food Chemistry | Year: 2014

Dyes obtained from different natural sources have emerged as an important alternative to synthetic dyes. In this study, optimisation of natural colorant non-conventional extraction technique from olive waste was investigated using response surface methodology. The combined effects of extraction conditions on total phenolic content (TPC) and relative color strength (K/S) were studied using a three-level three-factor Box-Behnken design. The optimum conditions for dye extraction were found to be 0.14 mol/L, 62.11 min, 71.23 °C and 4.5 g for sodium hydroxide concentration, extraction time, temperature, and mass of the waste, respectively. The efficiency of extraction under these optimum conditions was found to be 1133.86 mg/L of phenolics and relative colour strength (K/S) equal to 23.22. Further, Fourier Transform Infrared Spectroscopy was used to identify the major chemical groups in the extracted dye. © 2014 Elsevier Ltd. All rights reserved.

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