81,284 research outputs found

    OPTIMIZATION OF ADSORPTION PROCESS FOR REMOVAL OF SULPHONATED DI AZO TEXTILE DYE

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    Treatment of textile waste water has emerged as a great matter of concern amongst scientific community because of essentiality and scarcity of this valuable natural resource. Various techniques have been employed for waste water treatment, amongst which use of natural materials have made a significant contribution in the area of sustainable environment.This paper focuses on the use of the seeds of Argemone Mexicana, a weed for removal of a textile dye from its synthetic solution. Optimisation of several parameters has been carried out for elimination of dye from water resource at neutral conditions. Variation in different parameters affecting decolorization of the dye from aqueous solution, have been studied at length. Maximum decolorization (About 60%) has been observed after four hours with 0.1 g of the elected natural adsorbent obtained after passing through sieve size of 300 µm.

    Removal of Dye in Wastewater via Adsorption Using Agricultural Waste (Natural Sorbent)

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    Dye isa coloring agent that iswidely used by some ofthe industries. The color removal from the effluent waterhas beenone of the concerns during the wastewater treatment process. This is to overcome any adverse effect caused from the releasing of the dye to the inland waters. Various separation techniques have been proposed to remove the dye and it is revealed that adsorption is one of the most effective techniques. Anyway, researches have been made to identify potential adsorbent that is low in cost to be the adsorbent for the separation process undertaken. This is done in orderto replace the activated carbon used as the adsorbent, dueto itshigh cost. The objective of this study is to investigate the potential of natural sorbent from agricultural waste in removing dye inwastewater. Two agricultural wastes are proposed to be the adsorbent which are oil palm leaves and corn husks. These adsorbents are easily available and not bulky to be handled. Furthermore, the recycling opportunities of this waste can be developed. Parameters such as adsorbent particle size, mass of adsorbent and initial dye concentration that will affect the dye removal via adsorption will be studied. The adsorbate used in this study is Methylene Blue. Different methods for different type of experiment are explained further in this report. From the study, it is found that smaller particle size, higher adsorbent mass and higher dye initial concentration will enhance the adsorption process. In conclusion, the proposed adsorbents which are the oil palm leaves and corn husk proven to have the potential in removing dye from wastewater. Recommendations of further work are also mention for continuity of this type of research

    Biopigment Tracing of Mangrove Rhizophora mucronate Leaf an Bark Waste and Its Application for Batik Dyeing by Multiple Fixations

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    The purpose of this research is to determine the pigments in the bark and leaves of mangrove (Rhizophora mucronata), to analyze rate of color fastness in batik, level of consumer interest, and most effective pricing for the resulting batik products. The research was conducted between June 2015 and February 2016, and took place in Mangunharjo village, Tugu district, Semarang city, Indonesia. The pigment identification tests were performed in Laboratorium Terpadu Universitas Diponegoro, Indonesia. This research focused on the leaves and barks of mangrove plants. The leaves and barks were extracted to be used as dyeing agents, after which the batik fabrics were fixated using alum, limestone and lotus. This descriptive research employed UV-Vis spectrophotometry to identify pigment and Adobe Photoshop computer program to perform color fastness analysis. The result showed that chlorophyll is a pigment which contributes to the color green in leaves. Photochemical test results also show that the pigment associated to the blackish-green hue was tannin, andthat which was associated with red was flavonoid and quinone. The various colors were applied in batik dyeing process, which resulted in a range of color from yellow to dark brown. Color fastness test of batik dyed with mangrove-derived pigments on wash air dry, wash press dry, and wash sun dry using calico as fabric showed that alum and limestone fixated fabric had the least color fastness, while conversely, lotus-fixated fabric displayed good color retention. Levels of consumer interest naturally-dyed batik fabric by alum fixation was 20%. Of all the respondents, 46.67% showed interest in limestone-fixated batik, whereas 40% responded well with the lotus-fixated batik. Consumer acceptance levels for the mangrove-dyed batik fixated by alum, limestone, and lotus were 6.67%, 16.66% and 13.33% respectively. High consumer interest in fabric fixated by limestone and lotus was attributed to darker and stronger hues. The most effective price point suggested per 2.1 x 1 m of fabric was between IDR 200,000 to IDR 350,000

    Adsorption of Acid Dyes on Anionic Clays

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    The presence of colour in many industrial effluent streams especially from the textile industry is aesthetically undesirable. Traditionally both biological and chemical methods have been employed for dye removal from waste streams, but these techniques have not been successful due to its highly structured polymers which are very difficult to decompose. Many physical and chemical treatment methods including coagulation, precipitation, filtration, membrane separation and oxidation have been used for the treatment of dye-containing effluents. Over the last few decades, sorption (as adsorption, biosorption and ion exchange) has gained importance as an effective purification and separation technique used in wastewater treatment. Activated carbon has been the most widely used adsorbent because of its high capacity for the adsorption of organic species. However due to the difficulty, high cost and expensive regenerationof the activated carbon, clays are being considered as alternative low cost adsorbents. A potential candidate is the hydrotalcite, a type of layered double hydroxide (LDH), occurs as natural clay like mineral and can be readily synthesized by co-precipitation method

    Colors from Ceylon: A Design Exhibit of Sustainable Textiles Dyed with Coconut Husk Waste.

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    Master of ScienceDepartment of Apparel, Textiles, and Interior DesignSherry J HaarInheriting tradition is an aspect of slow design that explores ways to sustain lost art and tradition. Even though natural dyeing was heavily practiced in Sri Lanka, most of the country’s textile and craft industry has diverted to using synthetic dyes that are bad for the environment. Many domestically used coconut husks in Sri Lanka are thrown away as waste which can be used as a source of natural dyes for textiles. The purpose of this study was to explore the dyeing potential and surface design possibilities of coconut (Cocos nucifera) husk fiber, a traditional dye source of Sri Lanka. A practice-based design approach was utilized for the project with weekly analysis and reflection on the collected data to move the design process forward. The research was conducted in four stages: dye experimentation, print design exploration, textile art, and exposition. Coconut husks were boiled in water to extract the dyes. Four pre-treatment methods such as aluminum acetate, gallnut, pomegranate, and henna were used for cellulose and potassium aluminum sulfate was used for silk fabrics to enhance the bond between fiber and dye. To increase the color range, iron and citric acid were used as post-treatments. The leftover dye bath was recycled to separate the pigment from the water to create a thickened dye paste that could be used to create surface prints. All the fabrics dyed in pink beige color with slight hue variations except for the fabrics that were pretreated with henna which turned out to have a yellow cast or nude color. During post-treatment iron-treated swatches had a greyish tone and citric acid treatment turned the swatches to a pale orange shade. The thickened dye paste consistency worked best with screen-printing leaving clear lines around the edges of the prints. Based on the findings, a collection of artifacts was developed in the form of textile art. The process and outcomes of the study were displayed in a gallery exhibit to create awareness of the craft of natural dyeing and promote using coconut husk waste as a sustainable dye option. All the selected fabrics performed well in the evenness of dye uptake and saturation between all the pre and post-treatment methods and surface printing quality. There was no color loss after hand washing indicating appropriate dye concentration and good dye to fiber bond. Therefore, coconut husk waste can be considered a good source of natural dye. The exposition served its purpose in promoting public recognition and developing public knowledge in the use of coconut husks to produce natural dyes

    Nanoclay as Adsorbent: Evaluation for Removing Dyes Used in the Textile Industry

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    The dyes commonly used in the textile industry have structural resonant valence distribution, within a complex molecule, which determines the color of the dyes. The coloring is produced by chromospheres holding radiation in UV-visible range. Besides coloring, these compounds can be found in waste water and cause serious problems in living organisms, because their biodegradation products may be a source of toxic substances such as amines, which are generated from the characteristic azo chromospheres groups in most of the dyes. Current treatments for color removal from hazardous waste from these materials are complex and costly, for this reason some industries do not treat the wastes generated during the staining step. The aim of this study is to evaluate the use of nanoclay as adsorbents for dye used in the textile industry. The dyes used in this work are commercially known as: Orange GR, Black GN an African Brown. Nanoclay was obtained by bentonite treated with organic cation. The retention of the dye was evaluated by measurements in the UV-visible spectrum by using a HP-8354 equipment.Fil: Martínez Stagnaro, Susana Yamila. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Comahue. Facultad de Ingeniería. Asentamiento Universidad Zapala; ArgentinaFil: Volzone, Cristina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; ArgentinaFil: Huck, Lucas Ruben. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; Argentin

    Penggunaan Teknologi Adsorpsi Untuk Menurunkan Konsentrasi Procion Red Mx-5b Pada Limbah Industri Tekstil Menggunakan Media Adsorben Abu Vulkanik Kelud Dan Pasir Vulkanik Merapi

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    Many pollutants contained in waste textile industry, one of which is color. Liquid waste dye can cause acute or chronic effects on living things depend on the duration of exposure and concentration of the dye. Adsorption is one form of wastewater treatment technologies. Adsorption is the process of adsorption of the substance / certain compounds on the solid surface (adsorbent). Kelud ash and Merapi sand is a natural mineral that has not been maintained and reused to the maximum. This study aimed to compare the effectiveness of Kelud ash and sand Merapi sand as adsorbent media to reduce the concentration of the dye Procion Red MX-5B contained in textile industry wastewater using a continuous method with vertical and horizontal reactor models. Adsorbent media Merapi sand and Kelud ash are separated and then activated chemically by using a solution of concentrated HCl to be clean from impurities and can be reuse as adsorbent. The variables of this study is color, reducing the concentration of the dye using a height comparison adsorbent media composition (100%: 0%, 75%: 25%, 50%: 50%, 25%: 75%, 0%: 100%) with debit flow of 50ml/min with a contact time (4, 8, 12, 16, 20 minutes). The results obtained showed that the greatest efficiency is obtained from vertical reactor with the adsorbent height ratio AVK 25%: 75% PVM with efficiency by 98.40% with color removal as much 16mg/l PtCo for color parameters. While on a horizontal reactor with the height ratio of adsorbent 100% AVK: 0% PVM with efficiency by 54.70% with a color removal as much 453mg / l PtCo

    Optimization of extraction and dyeing parameters for dyeing of khadi cotton fabric using waste/used marigold flower petals (Tagetes erecta)

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    The aim of the present study is to standardize a protocol for optimization of pre-treatment, mordanting and dyeing of cotton khadi fabric with waste marigold flower petals. The effects of different single and combined double mordanting on dye-ability and colour fastness properties have been studied after optimization of aqueous extraction of marigold flower as natural dye. Mordants used are potash alum, aluminium sulphate, stannous chloride as metallic salt mordant and harda (myrabolan) from natural source as mordant assistant. After finalizing the mordants, dyeing process variables are standardized for dyeing cotton khadi fabric with waste marigold flower extract as selective natural dye applied on 3% H2O2 (30%) bleached cotton khadi fabric. Dyeing process variables studied are dyeing time, temperature, MLR, pH, mordant concentration, dye concentration and salt concentration for dyeing with prefixed mordant. Colour fastness to washing, rubbing, light and perspiration against use of different mordants and also against different dyeing process variables are also investigated. The results indicate that, this particular natural dye renders better appreciation of colour yield by pre mordanting with 15% aluminium sulphate and harda (50:50) as compared to other single mordants (potash alum and stannous chloride) and double mordants used. Use of double mordant in 15 % application level, shows maximum K/S value with overall good colour fastness than others.

    Microwave-enhanced synthesis of biodegradable multifunctional chitosan hydrogels for wastewater treatment

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    Chitosan, a derivative of chitin, is a biodegradable polymer known of its favorable properties, applicable in medicine and industry. Commonly obtained chitosan hydrogels are of various swelling capacity, and may bind only anions losing their susceptibility to biodegradation. Hydrogels are mostly obtained using toxic crosslinkers, which pollute environment due to waste generation during their synthesis. In the present article a novel, waste-free method for obtaining chitosan hydrogels under microwave irradiation, is described. Their chemical and morphological structure, swelling properties, sorption capability of a model dye and cadmium ions are described, and kinetic studies, were carried out. Biodegradability of the obtained hydrogels was investigated with the Sturm Test method. As a result, multifunctional chitosan hydrogels with both negative and positive surface charges and increased ability of anions and cations binding, were obtained. Materials were fully biodegradable, capable to absorb high amounts of water, as well as to remove various water contaminants.Web of Science111081980
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