Clean-Up of Wastes from the Textile Industry Using Anionic Clays
Toxic dyes must be removed from waste water coming from the textile and paint industries. Adsorption is one possible method of removing dyes under ‘soft’ conditions, without the generation of secondary hazardous materials. The present study used the carbonate-containing layered double hydroxides (LDH), Mg-Al and Mg-Zn-Al (with a M2+/M3+ ratio of 3), as adsorbents to remove two industrial colorants, Astrazon Remazol Brilliant Blue and Direct Red, present in low concentrations in aqueous solutions. The physicochemical properties of adsorbents at the surfaces of LDH, as well as the properties of the solutions containing the dyes control how the colorants are removed. Both fresh and calcined LDH were effective in the removal experiments, with effectiveness ranging from 50 to 100%. Analysis of kinetic data demonstrated that the adsorption process fitted the pseudo-second-order model better than the pseudo-first order model, information which is useful for system design in the treatment of wastes from the textile industry. Parameters such as pH of solutions and concentration of dye in solution influenced mainly the initial adsorption rate.
Key WordsAdsorption Colorant Dyes Hydrotalcite Layered Double Hydroxides Remediation Textile Industry Wastes
Unable to display preview. Download preview PDF.
- Choudhury, A.K. (2006) Textile Preparation and Dyeing. Science Publishers, New Hampshire, USA.Google Scholar
- Jones, F. (1967) The color and constitution of organic molecules. Pp. 26–34 in: Pigments: An Introduction to their Physical Chemistry, (D. Patterson, editor). Elsevier, London.Google Scholar
- Lagergren, S. and Svenska, B.K. (1898) Zur theorie der sogenannten adsorption geloesterstoffe. Vetenskapsakademien Handligar, 24, 1.Google Scholar
- Morris, W.J. and Morris, J.C., (1963) Kinetics of adsorption on carbon from solution. Journal of the Sanitary Engineering Division of the American Society for Civil Engineers, 89, 31–60.Google Scholar
- Rives, V. (2002) Layered Double Hydroxides, Present and Future. Nova Science, New York.Google Scholar
- Veloso, C.O., Noda Pérez, C., de Souza, B.M., Lima Ev., C., Dias, A.G., Monteiro, J.L.F., and Henriques, C.A. (2008) Condensation of glyceraldehyde acetonide with ethyl acetoacetate over Mg, Al-mixed oxides derived from hydrotalcites. Microporous and Mesoporous Materials, 107, 23–30.CrossRefGoogle Scholar
- Vigo, T.L. (1994) Textile Processing and Properties: Preparation, Dyeing, Finishing and Performance. Elsevier, New York.Google Scholar