Functionalized fibrous materials for the removal of dyes

Abstract

Wastewater effluents from textile industry mainly contain dyes used in the dyeing or printing of textiles yarns or fabrics. A lot of technologies can be adopted for dye removal from wastewaters, including biological treatments based on activated sludge, adsorption on activated carbon, or membrane processes. Nevertheless, none of these methods is performing toward all classes of dyes; treatment plants of great dimensions and difficult handling can be required, while cost can be prohibitive. In the present study, dye adsorption was performed on lowcost fibrous cellulose materials, submitted to a cationization process using a quaternary ammonium reagent. These materials were characterized by FTIR-ATR spectroscopy, while the treatment efficiency was investigated through exhaustion and kinetic adsorption tests toward anionic dyes, such as acid, direct, reactive, and a cationic dye. Comparisons were carried out between treated and untreated samples, and with activated carbon. Best results were obtained with cationized cotton, both in linters or ''tulle'' fabric form, showing good performance toward all the investigated dyes. Tests in continuous flow confirmed the good behavior of these materials, but tulle fabric was better as filtration medium for a lower pressure drop. Finally, regeneration tests by bleaching were carried out finding that regenerated material maintained good adsorption power.

Removal of Acid Orange 7 Dye from Wastewater: Review

“…Synthetic dyes are extensively used in many industrial fields, such as dyestuffs, textile, paper and plastics. It is estimated that there are around 100,000 commercially available dyes with over 7×105 tons of dyestuff are produced annually [1][2][3][4]. Synthetic dyes exhibit considerable structural diversity, and, on an industrial scale, they can be classified into azo, anthraquinone, sulfur, indigo, triphenylmethyl (trityl), and phthalocyanine derivatives [5,6].…”

Removal of Direct dyes with Alginic acid

“…Different strategies have been used to remove direct dyes from aqueous solution, among them, advanced oxidation processes [6][7][8][9][10][11][12][13], coagulation/flocculation [14], electrochemical processes [15,16], extraction [17], inclusion in polymeric materials such as β-cyclodextrin-based polymers, and calixa(n)renes derivatives [18][19][20][21][22][23], bacterial biodegradation [24][25][26], decolorization with fungi and their purified enzymes [27][28][29][30], and adsorption [31][32][33]. However, each method has its own limitations and drawbacks such as high cost of the material used in dye removal, cost of confinement of residual products, and the high energy demand of the processes, among others.…”

Preparation of Bamboo Chars and Bamboo Activated Carbons to Remove Color and COD from Ink Wastewater

“…To remove the hazardous dyes from wastewater, various treatments such as coagulation (Patel and Vashi, 2012), membrane separation (Ciardelli et al, 2000), and adsorption (Ferrero and Periolatto, 2011;Yavuz and Aydin, 2006) have been extensively studied. The adsorption by activated carbon is one of the major options to remove organic compounds including dyes from aqueous solution.…”