Photonic crystals in biology - NanoTR-VI

PPPPoster Session, Thursday, June 17Theme F686 - N1123The Use of Organoclay in Textile Waste Water Treatment112UE. Perrin Akçakoca KumbasarUP P*, Seniha ElemenP Pand Saadet YaparPPDepartment of Textile Engineering, Ege University, Izmir, TurkeyPDepartment of Chemical Engineering, Ege University, Izmir, Turkey21Abstract- In this study organoclay was used as sorbent for textile dyes. The results obtained from the batch adsorption experiments showed thatorganoclay has very strong sorption ability for textile dyes.Textile wet processing involves the use of a variety ofchemicals including various classes of dyes and auxiliaries.These components have negative environmental impact suchas the exceptionable coloring on the surface waters. Thereforethe methods for decoloration become important issue in recentyears [1].In principle, decoloration is possible with one or more of thefollowing methods: adsorption, precipitation, chemicaldegradation, photo degradation and biodegradation.Adsorption appears to be a good method for the treatment oftextile industry effluents [2]. The process of adsorption isbeing increasingly used for ecofriendly and economicdecoloration process of textile dye effluents. There are manyworks on the adsorption systems; however dye adsorption is acomplicated process because of the nature of dye and theirbehavior in aqueous solutions [1].for 24h. The supernatants were analyzed by using a UVspectrophotometer and adsorbed amounts were determinedfrom the difference between initial and final concentrations.The change in % decoloration with dye concentration wasgiven in Figure 1.Figure 2. (A), (B) and (C) Decoloration of reactive, dispers anddirect dyes with SAMPLE I; (D), (E) and (F) Decoloration ofreactive, dispers and direct dyes with SAMPLE II, respectively.Figure 1. Structure of the clayThere are many sorbents for decoloration. In this work weexplored organoclay as sorbent for textile dyes. Clay mineralshaving layered structure and a high surface area have beeneasily modified to obtain in predescribed properties for aspecial application [3,4]. For instance, they are modifiedthrough the replacement of inorganic exchange cations withquaternary alkylammonium derivatives to have anorganophilic material.In this work, two different types of organoclay synthesizedby using Hexadecyltrimethylammonium (HDTMA) cations inan amount equivalent to 100 % of cation exchange capacity ofclay (CEC) in a research laboratory in the ChemicalEngineering Department [5]. The synthesis conditions werethe same for both of the samples except the last step, drying.At this step, the samples were dried by using a freeze dryerand/or an oven. For the preceeding parts of the work, the claysdried using oven and freeze dryer will be defined as SAMPLEI and SAMPLE II, respectively.The adsorption behavior of reactive, dispers and direct dyeswere studied by conducting batch adsorption experiments at30 °C. The dispersions containing dye and clay were shakenAs shown in the Figure, Sample I and II have decolorationefficiencies about %90 and %70, respectively. The increase in% decoloration with increasing dye concentration indicatesthat the oven dried clay will also be successful in highconcentration.It was observed that the organoclay has potentiality in theremoval of textile dyes through adsorption. Also two types oforganoclay were compared by their sorption isotherms and itwas found that the clay dried using freeze dryer moresuccessful than the oven dried clay.HT*Corresponding author: perrin.akcakoca@ege.edu.trTH[1] Noroozi, B., Sorial, G.A., Haghi, A.K., 2008. Achievements inTextile Dyes Removal Using Adsorption, Polymers ResearchJournal, 2 (1), 29-58.[2] Ceyhan, Ö., Baybas, D., 2001. Adsorption of Some Textile Dyesby Hexadecyltrimethylammonium Bentonite, Turk J Chem 25 , 193 -200.[3] Bergaya, F., Lagaly, G., 2001. Surface modifictaion of clayminerals, Applied Clay Science, 19, 1–3.[4]Yılmaz, N., Yapar, S., 2004. Adsorption properties of tetradecylandhexadecyl trimethylammonium bentonites, Applied ClayScience, 27, 223-228.[5]Yapar, S., 2009. Physicochemical study of microwave-synthesizedorganoclays, Colloids and Surfaces A; Physicocherm, EngineeringAspects,345, 75-81.6th Nanoscience and Nanotechnology Conference, zmir, 2010 790