Importance of estimation of optimum isotherm model parameters for adsorption of methylene blue onto biomass derived activated carbons: Comparison between linear and non-linear methods

Paluri, Paidinaidu; Ahmad, Khwaja Alamgir; Durbha, Krishna Sandilya

doi:10.1007/s13399-020-00867-y

Cited by 31 publications

(18 citation statements)

References 35 publications

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“…coli were best fitted to Freundlich linear and nonlinear models shown in Figure a–f, which corresponded to the higher R 2 values of the Freundlich model than the Langmuir model shown in Table . Literature review shows that other studies also found the same results as this study, that is, the results of the adsorption linear model agreed to those of the nonlinear model, and the equilibrium isotherm parameters of both linear and nonlinear models had close values. − As a result, both linear and nonlinear adsorption models are necessary to plot and calculate all isotherm parameters for confirming which adsorption model is the best-fit model to the actual experiment values to avoid errors. , …”

Section: Resultssupporting

confidence: 80%

“…74−78 As a result, both linear and nonlinear adsorption models are necessary to plot and calculate all isotherm parameters for confirming which adsorption model is the best-fit model to the actual experiment values to avoid errors. 79,80 Finally, since the R 2 value is generally used to decide which adsorption isotherm model well explains an adsorption pattern of adsorbent, a higher R 2 close to 1 is suitably chosen. Therefore, the adsorption isotherm of CFB on S. aureus and E. coli corresponded to the Freundlich model in both linear model (R 2 = 0.92 and 0.93) and nonlinear model (R 2 = 0.97 and 0.98), which indicated that the adsorption pattern could be explained by a physiochemical adsorption process with multilayer or heterogeneous adsorption.…”

Section: Resultsmentioning

confidence: 99%

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Modified Alginate Beads with Ethanol Extraction of Cratoxylum formosum and Polygonum odoratum for Antibacterial Activities

Ngamsurach

Praipipat

2021

ACS Omega

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Bacteria contaminations in water are concerned as environmental effects including human health, so water treatment is required before use. Although using extracted plant is interesting because of their good chemical compounds for bacterial inhibitions, no study has applied the extracted plant in bead materials for disinfection in wastewater. The current research attempted to extract Cratoxylum formosum and Polygonum odoratum for the synthesis of C. formosum beads (CFB) and P. odoratum beads (POB), and their antibacterial efficiencies were investigated by agar diffusion tests, antibacterial batch tests, adsorption isotherm and kinetics, and material reusability. C. formosum and P. odoratum leaves were ethanol-extracted, and their bead materials (CFB and POB) were synthesized. Furthermore, their characterizations of surface area, chemical compositions, and chemical functional groups were investigated. For field emission scanning electron microscopy and focused ion beam (FESEM-FIB) analysis, CFB and POB had spherical shapes with coarse surfaces. Energy-dispersive X-ray spectrometry (EDX) analysis of CFB and POB illustrated five main chemical compositions, which were carbon (C), oxygen (O), calcium (Ca), chlorine (Cl), and sodium (Na), whereas Fourier transform infrared (FTIR) spectroscopy analysis identified seven main chemical functional groups, which were O−H, C−H, CO, CC, N−H, C−O, and C−Cl. Agar diffusion tests confirmed the abilities of CFB and POB to inhibit both Staphylococcus aureus and Escherichia coli, and batch experiments examined high antibacterial efficiencies of CFB of almost 100% on both bacterial types. The adsorption isotherm of CFB corresponded to the Freundlich model, which is related to the physiochemical adsorption process with multilayer or heterogeneous adsorption, and the adsorption kinetics of CFB was correlated to the pseudo-second-order kinetic model, which involved chemisorption relating to physiochemical interaction. Moreover, the desorption experiment confirmed the reusability of CFB. Therefore, CFB is a potential material to possibly apply for disinfection of wastewater.

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Modified Alginate Beads with Ethanol Extraction of Cratoxylum formosum and Polygonum odoratum for Antibacterial Activities

Ngamsurach

Praipipat

2021

ACS Omega

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“…The Marquardt’s percentage standard deviation (MPSD) (eq ) was applied to evaluate the applicability of isotherm models, and it is defined in the following equation where q e,exp (mg/g) and q e,cal (mg/g) are the experimental and calculated adsorption capacities at equilibrium, respectively.…”

Section: Experimental Sectionmentioning

confidence: 99%

Production and Dry Mechanochemical Activation of Biochars Derived from Moroccan Red Macroalgae Residue and Olive Pomace Biomass for Treating Wastewater: Thermodynamic, Isotherm, and Kinetic Studies

Tayibi

Monlau²,

Fayoud

et al. 2020

ACS Omega

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This study aimed to produce activated biochars (BCs) from Moroccan algae residue (AG) and olive pomace (OP) using mechanochemical activation with NaOH and ball milling (BM) for treating artificial textile wastewater containing methylene blue (MeB). The produced OP-activated BC by BM showed the highest absolute value of ζ-potential (−59.7 mV) and high removal efficiency of MeB compared to other activated BCs. The nonlinear pseudo-first-order kinetic model was the most suitable model to describe the kinetics of adsorption of MeB onto biochars produced from AG and the NaOH-activated BC from OP, whereas the nonlinear pseudo-second-order kinetic model suits the OP raw biochar and BM-activated BC. The nonlinear Langmuir isotherm model was the most suitable model for describing MeB adsorption onto BCs, compared to the nonlinear Freundlich isotherm model. The maximum adsorption capacities of AG-activated BCs with NaOH and BM were 13.1 and 9.1 mg/g, respectively, while those of OP-activated BCs were 2.6 and 31.8 mg/g, respectively. The thermodynamic study indicates the spontaneous and endothermic nature of the adsorption process of most activated BCs. In addition, ΔS° values indicate the increase of randomness at the solid–liquid interface during MeB sorption onto BC.

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“…Since the plotting of non-linear kinetic models helped to confirm the result of linear plotting to protect the processing data, 81 many previous studies have reported both linear and non-linear kinetic models to confirm their results. 76,77,82,83 Similarly, this study reported and compared the results of linear and non-linear of both the kinetic models, and their results agreed closely with the kinetic parameter values.…”

Section: Resultsmentioning

confidence: 90%

Antibacterial activities against Staphylococcus aureus and Escherichia coli of extracted Piper betle leaf materials by disc diffusion assay and batch experiments

Ngamsurach

Praipipat

2022

RSC Adv.

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Importance of estimation of optimum isotherm model parameters for adsorption of methylene blue onto biomass derived activated carbons: Comparison between linear and non-linear methods

Cited by 31 publications

References 35 publications

Modified Alginate Beads with Ethanol Extraction of Cratoxylum formosum and Polygonum odoratum for Antibacterial Activities

Modified Alginate Beads with Ethanol Extraction of Cratoxylum formosum and Polygonum odoratum for Antibacterial Activities

Production and Dry Mechanochemical Activation of Biochars Derived from Moroccan Red Macroalgae Residue and Olive Pomace Biomass for Treating Wastewater: Thermodynamic, Isotherm, and Kinetic Studies

Antibacterial activities against Staphylococcus aureus and Escherichia coli of extracted Piper betle leaf materials by disc diffusion assay and batch experiments

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