title: Biosorption of malachite green by eggshells: mechanism identification and process optimization.
abstract: In the present work, eggshells were used to remove a dye (malachite green) from wastewater. The study was focused on identification and describing the binding mechanism of the dye by eggshells in a biosorption process optimized by Response Surface Methodology based on the Box-Behnken Design. The mechanism of biosorption was determined by characterization of the biosorbent before and after biosorption using scanning electron microscopy, X-ray diffraction analysis, the Brunauer-Emmett-Teller isotherm method, Fourier transform infrared spectroscopy. The second-order polynomial equation and 3D response surface plots were used to quantitatively determine the relationships between dependent and independent variables. The obtained results suggested the mechanism of wastewater treatment that included physical adsorption, alkaline fading phenomenon and microprecipitation. The results of the present study showed that waste eggshells have the potential to be used as an inexpensive but effective biosorbent useful in wastewater treatment.
authors: Wroclaw University of Technology, Department of Chemistry, Wroclaw, Poland.
authors: Daria
authors: D
authors: Podstawczyk
authors: Wroclaw University of Technology, Department of Chemistry, Wroclaw, Poland.
authors: Anna
authors: A
authors: Witek-Krowiak
authors: Institute of Inorganic Technology and Mineral Fertilizers, Department of Chemistry, Wrocław University of Technology, Smoluchowskiego 25, 50-372 Wrocław, Poland. Electronic address: katarzyna.chojnacka@pwr.wroc.pl.
authors: Katarzyna
authors: K
authors: Chojnacka
authors: Wroclaw University of Technology, Department of Chemistry, Wroclaw, Poland.
authors: Zygmunt
authors: Z
authors: Sadowski
mesh_terms: D000327:Adsorption; D000704:Analysis of Variance; D000818:Animals; D001673:Biodegradation, Environmental; D018533:Biomass; D004528:Egg Shell / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D012394:Rosaniline Dyes / Q000302:isolation & purification*
chemical_list: D012394:Rosaniline Dyes; C005095:malachite green
keywords: Alkaline fading; Biosorption; Eggshells; Malachite green; Response Surface Methodology