4.7 Article

Biodegradable hollow zein nanoparticles for removal of reactive dyes from wastewater

Journal

JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 125, Issue -, Pages 33-40

Publisher

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2013.03.050

Keywords

Adsorption; Hollow zein nanoparticles; Reactive Blue 19; Simulated dyeing effluent; Langmuir isotherm

Funding

  1. Nebraska Corn Board, Agricultural Research Division at the University of Nebraska-Lincoln, USDA Hatch Act [S-1054 (NEB 37-037)]
  2. AATCC
  3. John and Louise Skala Fellowship

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In this study, biodegradable hollow zein nanoparticles with diameters less than 100 nm were developed to remove reactive dyes from simulated post-dyeing wastewater with remarkably high efficiency. Reactive dyes are widely used to color cellulosic materials, such as cotton and rayon. Wastewater from reactive dyeing process contains up to 50% dye and electrolytes with concentrations up to 100 g L-1. Current methods to remove reactive dyes from wastewater are suffering from low adsorption capacities or low biodegradability of the sorbents. In this research, biodegradable zein nanoparticles showed high adsorption capacities for dyes. Hollow zein nanoparticles showed higher adsorption for Reactive Blue 19 than solid structures, and the adsorption amount increased as temperature decreased, pH decreased or initial dye concentration increased. At pH 6.5 and pH 9.0, increasing electrolyte concentration could improve dye adsorption significantly. Under simulated post-dyeing condition with 50.0 g L-1 salt and pH 9.0, maximum adsorption of 1016.0 mg dye per gram zein nanoparticles could be obtained. The adsorption capacity was much higher than that of various biodegradable adsorbents developed to remove reactive dye. It is suggested that the hollow zein nanoparticles are good candidates to remove reactive dye immediately after dyeing process. (C) 2013 Elsevier Ltd. All rights reserved.

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