Adsorption of Brilliant Blue on XAD4 Amberlite/Agaricus Campestris Composite Material; Optimization of Medium conditions using Response Surface Methodology

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Van Yüzüncü Yıl Üniversitesi, Mühendislik Fakültesi, Kimya Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2021

Tezin Dili: İngilizce

Öğrenci: Ahmed Abdulkareerim Ahmed

Danışman: Vahap Yönten

Özet:

The main objective of this thesis is optimizing the optimum conditions for the maximum adsorption of Brilliant Blue (BBG) from aqueous solution by a XAD4 Amberlite/Agaricus Campestris as a bio composite adsorbent by applying a multi-step experimental design of Response Surface Methodology (RSM). In first step, the effect of factors (initial dye concentration, temperature, contact time, pH, shaking speed, sample volume and adsorbent dosage) was obtained using PBD. Then Steepest Ascent Method (SAM) used to predict the optimum region of effective factors in the second step. CCD was utilized to evaluate the optimum medium conditions of effective parameters for the removal of dye on last step. RSM indicated that optimum conditions of initial dye concentration, sample volume, contact time and adsorbent dosage for maximum removal of BBG (96.72%) were achieved as 107.13 mg/L, 28.6 ml, 60.78 min and 0.38 g respectively. The characterization of adsorption process was confirmed by (SEM) and EDX Data. Adsorption isotherm was used to describe the adsorption equilibrium studies at different temperatures. Temkin isotherm shows better fit than Langmuir, Freundlich and Harkins–Jura isotherms. Thermodynamic parameters like the enthalpy -22.81 kJ/mol (ΔH^o), entropy 97.96 J/mol.K (ΔS^o) and Gibbs free energy -6.53 kJ/mol (ΔG^o) were evaluated. The negative value of ΔG^o and ΔH^o was indicating that the adsorption process was spontaneous and exothermic in nature. The results show that a multi-step statistical optimization designs is successfully applied to experiments and XAD4/A. Campestris is an appropriate bio composite adsorbent and has a specific affinity for removal of BBG from aqueous solution under optimal conditions.

Keywords: BBG, RSM, Optimization, Composite Material, XAD4, A. Campestris.