ÖzAdsorption is one of the most widely used methods for dye removal from water. At the end of the adsorption process, the dyed adsorbents emerging as a second-order waste which is the main disadvantage of this process. In this study, the removal of a synthetic dye Crystal Violet (CV) from the synthetic wastewater by using Centaurea solstitialis (CS) and Verbascum Thapsus (VT) plants was studied by adsorption. At the end of the adsorption process, the reusing potential of the dyed plant was explored by measuring the dyed plant calorific values. Experimental design and modeling were performed using the surface response method (RSM). The regression coefficients for developed models were 0.86 for the CS plant and 0.95 for the VT plant. Adsorption process for CS and VT plants were fitted by Dubinin-Radushkevich isotherm, and Temkin isotherm, respectively. The two plants were pseudo-second-order, endothermic, and found to be chemically. CS plant had a capacity of 84.03 mg.g -1 with a contact time of 85 min. The capacity of the VT plant reached 109.89 mg.g -1 at a contact time of 55 min. The calorific values results show increases in the calorific values for the two plants after the adsorption process. The CS plant increased from 4003.774 to 4458.059 Kcal.Kg -1 . Whereas the VT plant increased from 3206.028 to 4120.330 Kcal.Kg -1 . These values indicate the using possibility of the two plants as solid fuel by burning the dyed plants in emission controlled industrial facilities by applying the zero-waste concept. Adsorpsiyon, sudan boya gideriminde kullanılan en yaygın yöntemlerden biridir. Adsorpsiyon yönteminin en önemli dezavantajı, işlem sonunda ikinci bir atık olarak boyalı adsorban maddelerin oluşmasıdır. Bu çalışmada, adsorban olarak Senturea solstitialis (CS) ve Verbascum thapsus (VT) bitkileri kullanılarak sulu çözeltiden Crystal Violet'in (CV) uzaklaştırılması incelenmiştir. İşlem sonunda elde edilen boyalı adsorbanların kalorifik değerleri belirlenerek farklı amaçlar için kullanılabilirliği araştırılmıştır. Deneysel tasarım ve modelleme, yüzey tepki yöntemi (RSM) kullanılarak gerçekleştirilmiştir. Geliştirilen modeller için regresyon katsayıları CS bitkisi için 0.86 ve VT bitkisi için 0.95 olarak bulunmuştur. Adsorpsiyon işleminde CS ve VT bitkilerinin sırasıyla Dubinin-Radushkevich ve Temkin izotermine uyduğu tespit edilmiştir. Her iki bitki için de adsorpsiyon, sahte ikinci derece kinetik, endotermik ve kimyasal reaksiyon olarak gerçekleşmiştir. CS bitkisi için maksimum adsorpsiyon kapasitesi 84.03 mg.g -1 ve temas süresi 85 dk.'dır. VT bitkisi için ise maksimum adsorpsiyon kapasitesi olan 109.89 mg.g -1 'e, 55 dk.'da ulaşılmıştır. Her iki bitkinin de adsorpsiyon öncesinde ve sonrasında kalorifik değerleri ölçülmüş ve adsorpsiyon işlemi sonrasında elde edilen boyalı adsorbanların kalorifik değerlerinin arttığı tespit edilmiştir. CS bitkisinde kalorifik değer 4003.774'ten 4458.059 Kcal.Kg -1 'e yükselirken VT bitkisinde 3206.028'den 4120.330 Kcal.Kg -1 'e yükselmiştir. Bu değerler, adsorpsiyon işlemi sonrasın...
Invasive plants reduce the yield by inhibiting the development of agricultural products. In this study, invasive (CS) plant which is agricultural waste was used as adsorbent for removal of Malachite Green (MG) from aqueous solution. The adsorbent-adsorbate relationship was examined by the spectrophotometric method and Fourier transform infrared (FTIR). The surface morphology was determined by scanning electron microscope (SEM). CS surface area was measured by Brunauer, the Emmett and Teller (BET) analysis. The experiments were designed and modeled by RSM. The correlation factor of the developed model was 0.984. The capacity of 90.816 mg.g-1 was achieved when MG solution with concentration of 312.5 mg.L-1 was adsorbed onto 0.325 g CS for 75 min at a pH of 7.5. In this work the shaking velocity and the adsorbent size were 150 rpm and 30 mesh respectively. Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich (D-R) isotherms were studied. Temkin isotherm had the highest R 2 of 0.997. The kinetics models of the adsorption process were investigated and fitted with pseudo-second-order kinetic (R 2 = 0.9982). The intraparticle diffusion model reflected the involved two steps; the first comprehended the boundary diffusion layer, while the second introduced the intraparticle diffusion effects. The adsorption was found to be endothermic with a Gibbs free energy of-4.47 KJ.mol-1. It was noted that the adsorption process was irreversible with a max percentage of desorption process of 2.16%. Column experiments were conducted to realize the adsorption process. The efficiency of the column reached 99.5% after 40 min and stilled constant. As a result, CS has shown a potential for MG removal from aqueous solution.
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