Linear and Nonlinear Regression Analysis for the Adsorption of Remazol Dye by Romanian Brewery Waste By-Product, Saccharomyces cerevisiae

Abstract

Earth’s water balance and economy are becoming increasingly fragile due to overpopulation, global warming, severe environmental pollution and both surface and groundwater pollution. Therefore, it is essential to find solutions to the problems of water scarcity and water pollution. In this research, an experiment was designed to optimize the technique for the adsorption of Remazol Red F3B (RR) dye by lyophilized brewery yeast waste from the fermentation process. Moreover, we proved that brewery yeast is a great adsorbent. Batch adsorption experiments were carried out for optimization of different initial parameters, such as initial dye concentration (5–1000 mg/L), amount of yeast (0.5–2.5 g), pH (3–11) and temperature (20 to 40 °C). Furthermore, the structure and elemental composition of the adsorbent were analyzed with SEM, EDS and FTIR before and after biosorption. The best fits for the mathematical isotherm models in the case of the linear form were the Langmuir I and Freundlich models (R2 = 0.923 and R2 = 0.921) and, for the nonlinear form, the Khan model (R2 = 0.9996) was the best fit. The pseudo-second-order kinetic model showed the best fit for both linear (plotting t/qt vs. t) and nonlinear forms, are the calculated qe values were similar to the experimental data.

Adsorption of cationic/anionic dyes and endocrine disruptors by yeast/cyclodextrin polymer composites

“… 31 The peaks at 1643, 1538, and 1241 cm −1 were observed as amide I, II, and III bands, respectively, which are the characteristic N–H vibrational peaks of yeast cell proteins. 32 The absorption peaks at 1064 cm −1 and 1391 cm −1 correspond to P O in –OPO 3 2− (phosphoryl) on the IBY surface and C O stretching of the protein carboxyl group, respectively. 33 The adsorption band of IBY-PA-CDP at –OH (3400 cm −1 ) was reduced compared to those of β-CD and IBY, suggesting that the –OH group of IBY or β-CD reacts with PA. 31 The adsorption band of IBY-PA-CDP at 1632 cm −1 was the overlapping peak of the hydroxyl group bending vibration of β-CD and the amide I band of IBY.…”

Magnetic Luffa-Leaf-Derived Hierarchical Porous Biochar for Efficient Removal of Rhodamine B and Tetracycline Hydrochloride

“…Although the theoretical adsorption capacities ( Q e.cat ) calculated from the model (904.1, 1356.3, and 1571.5 mg/g of LLB-MB for RhB; 988.3, 1415.9, and 1670.0 mg/g of LLB-MB@Fe 3 O 4 for RhB; 798.3, 1237.1, and 1570.1 mg/g of LLB-MB for TH; and 874.8, 1413.7, and 1680.4 mg/g of LLB-MB@Fe 3 O 4 for TH) were slightly lower than the experimental Q e (941.6, 1386.6, and 1606.5 mg/g of LLB-MB for RhB; 998.1, 1502.2, and 1698.2 mg/g of LLB-MB@Fe 3 O 4 for RhB; 831.4, 1298.0, and 1602.4 mg/g of LLB-MB for TH; and 896.1, 1453.5, and 1749.9 mg/g of LLB-MB@Fe 3 O 4 for TH), they still indicated that the PFK model may be applicable to the adsorption process in some aspects. At the same time, it also showed that the adsorption capacity will increase with the initial concentration increasing to some extent [ 42 , 43 ]. While Ho-McKay’s PSK model was used to fit the data, the correlation coefficients ( R 2 ) of LLB-MB and LLB-MB@Fe 3 O 4 ranged from 0.9987 to 0.9998 and from 0.9964 to 0.9998 for RhB and ranged from 0.9989 to 0.9998 and from 0.9983 to 0.9994 for TH, which showed the applicability of PSK in the adsorption process.…”

“…While Ho-McKay’s PSK model was used to fit the data, the correlation coefficients ( R 2 ) of LLB-MB and LLB-MB@Fe 3 O 4 ranged from 0.9987 to 0.9998 and from 0.9964 to 0.9998 for RhB and ranged from 0.9989 to 0.9998 and from 0.9983 to 0.9994 for TH, which showed the applicability of PSK in the adsorption process. In addition, the adsorption processes of LLB-MB and LLB-MB@Fe 3 O 4 for RhB and TH may be chemical reactions, and the adsorption behaviors of chemisorption bonds formed by transfer, exchange, or sharing can control the adsorption rate and affect the adsorption process of the adsorbents [ 28 , 42 , 43 ].…”

Cinnamyl-Modified Polyglycidol/Poly(ε-Caprolactone) Block Copolymer Nanocarriers for Enhanced Encapsulation and Prolonged Release of Cannabidiol

“…In order to elucidate the release mechanism of CBD from the micelles, the release profiles were fitted by linear regression to several kinetic models: order Higuchi and Korsmeyer-Peppas (Figures S6 and S7). Data are present For a more accurate interpretation of the data from the dissolution test, we conducted a non-linear regression analysis [73,74] whereby the drug-relea fitted to the Korsmeyer-Peppas model using DDSolver-a freely available software [75]. The results are summarized in Table S3.…”