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Modification of polyamide 6.6 dyeing properties by grafting with poly(acrylic a...
Miranda, Teresa; Santos, Jorge Gomes; Soares, Graça M. B.978-972-8063-67-2 ; The wet chemical surface modification continues to be a growing area of research interest. This study describes preparation and characterization of poly (acrylic acid)-grafted polyamide 6.6 fabric. Poly(acrylic acid) has been grafted onto polyamide backbone using benzoyl peroxide (BPO) as catalyst in aqueous medium. The benzoyl peroxide initiator optimum concentration was 0.03 M. The best c...
Preparation of silk fibroin–poly(ethylene glycol) conjugate films through click...
Sampaio, Sandra; Miranda, Teresa; Santos, Jorge Gomes; Soares, Graça M. B.Azide silk fibroin (azido SF) and alkyne terminal poly(ethylene glycol) (PEG) 2000 (acetylene-terminal PEG 2000) were synthesized. Azido SF was reacted with acetylene-terminal PEG 2000 to produce films via a copper-mediated 1,3-cycloaddition (‘click’ chemistry) generating a triazole linkage as the networking forming reaction. Through click chemistry, novel silk-based films with various weight ratios were prepar...
Studies on cotton modification with dodecenyl succinic anhydride (DDSA)
Miranda, Teresa; Le Goff, Amélie; Pereira, Anabela; Soares, Graça M. B.DDSA cotton materials were prepared by esterification reaction in aqueous suspension medium using an environmental friendly method. The main factors affecting the reaction, including temperature and pH of the system, were investigated and 40ºC and pH 8.5 were defined as the best reaction conditions to obtain DDSA cotton. The chemical structural characteristics of the samples were investigated by FTIR- ATR metho...
Photodegradation studies on C. I. reactive red 158
Miranda, Teresa; Hrdina, Radim; Oldrich, Machalicky; Campos, Ana M. F. OliveiraDye-containing wastewater generated from textile industries is a major source of environmental pollution. Azo dyes, which are the largest group of coloring agents, are widely used in industry. Advanced Oxidative Processes are very promising for effluent treatment mainly due to their high efficiency and simplicity of operation. Our group became interested on photocatalytic methods (included in the AOP’s), using ...
Current situation and future perspectives for textile effluent decolourisation
Soares, Graça M. B.; Miranda, Teresa; Campos, Ana M. F. Oliveira; Hrdina, Radim; Ferreira, M. Costa; Amorim, M. T. Pessoa deTextile dyes are an important class of synthetic organic compounds and are therefore common industrial pollutants. They are produced in large scale and may enter the environment during production or later on during fibre dyeing. Due to the stability of modern dyes, conventional biological (activated sludge) treatment methods for industrial wastewater are ineffective, resulting in an intensively coloured dischar...
Photocatalytic decolourisation of textile azo dyes
Miranda, Teresa; Soares, Graça M. B.; Campos, Ana M. F. Oliveira; Kaja, Martin; Hrdina, Radim; Machalicky, OldrichFour model dyes were synthesised using classical preparative techniques. They represent the molecular structures frequently used in the production of industrial textile mordant dyes. Dyes decolourisation was developed in a lab-scale thin film photoreactor equipped with a white lamp and quartz tube, in the presence of different semiconductors, such as TiO2, ZnO and Fe2O3. The quantum yields of photochemical degr...
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