Removal of Anthraquinone Dye via Struvite: Equilibria, Kinetics, Thermodynamics, Fuzzy Logic Modeling
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RESEARCH PAPER
Removal of Anthraquinone Dye via Struvite: Equilibria, Kinetics, Thermodynamics, Fuzzy Logic Modeling Kaan Yetilmezsoy1 · Didem Özçimen2 · Anıl Tevfik Koçer2 · Majid Bahramian1 · Emel Kıyan1 · Havva Melda Akbin1 · Bülent İlhan Goncaloğlu1 Received: 14 April 2020 / Revised: 25 July 2020 / Accepted: 31 July 2020 © University of Tehran 2020
Abstract Adsorption potential of the struvite (recovered from the high-strength ammonium-rich synthetic wastewater) was explored for the first time for the removal of an anthraquinone dye (Remazol Brilliant Blue R, RBBR) from aqueous phases. According to the experimental findings obtained from the RBBR-struvite adsorption system, the maximum dye removal efficiency (≈ 79%) was achieved at pH of 2.0, adsorbent dose of 40 g/L, initial dye concentration of 80 mg/L, contact time of 60 min, and temperature of 60 °C. Adsorption isotherms showed that both Langmuir and Freundlich isotherm models fitted very well to the experimental data (R2 > 0.990), and adsorption kinetics were satisfactorily described by the Ho and McKay’s PSO kinetic model (R2 ≈ 0.990). Based on the Langmuir isotherm model, the maximum adsorption capacity of the struvite for the RBBR dye was determined as 21.73 mg/g. The sample exhibited a mesoporous structure and had a BET surface area of 16.35 m2/g. Thermodynamic parameters (ΔG°, ΔH°, and ΔS°) confirmed that the adsorption of the RBBR dye onto the struvite was spontaneous and endothermic in nature and reflected the enhanced degree of disorderliness at the solid/liquid interface, respectively. A MIMO (multiple inputs and single output) Mamdani-type fuzzy inference system was developed for the first time in modeling of the RBBR-struvite adsorption system. The proposed fuzzy logic model showed a superior prediction performance (R2 ≈ 0.980) when compared to the conventional multiple regression methodology. Overall experimental and statistical results confirmed that struvite could be used as a promising adsorbent material for anthraquinone dye removal from aqueous solutions. Keywords Adsorption · Remazol brilliant blue R · Struvite · Dye removal · Modeling · Fuzzy logic
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s41742-020-00275-0) contains supplementary material, which is available to authorized users.
Dye is a substance for transmitting color to textiles in a such way that the coloring is not readily changed by washing, heating, lightening, or any consecutive phase to which the cloth may be exposed. As it is commonly used in the textile industry due to this versatility, the environmental effects of
* Kaan Yetilmezsoy [email protected]; [email protected]
Havva Melda Akbin [email protected]
Didem Özçimen [email protected]
Bülent İlhan Goncaloğlu [email protected]
Anıl Tevfik Koçer [email protected]
1
Department of Environmental Engineering, Faculty of Civil Engineering, Yildiz Technical University, Davutpasa Campus, 34220 Esenler, Istanbul, Turk
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