A new linear form analysis of Redlich–Peterson isotherm equation for the adsorptions of dyes

The need to design low-cost adsorbents for the detoxification of industrial effluents has been a growing concern for most environmental researchers. So modelling of experimental data from adsorption processes is a very important means of predicting the mechanisms of various adsorption systems. Therefore, this paper presents an overall review of the applications of adsorption isotherms, the use of linear regression analysis, nonlinear regression analysis, and error functions for optimum adsorption data analysis.

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“…A plot of ln( / ) versus ln enables the determination of Redlich-Peterson constants, where is slope and is intercept [30,[42][43][44][45].…”

Section: Redlich-petersonmentioning

confidence: 99%

Modelling and Interpretation of Adsorption Isotherms

Ayawei

Ebelegi

Wankasi

2017

Journal of Chemistry

1,925

885

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“…When g = 1, this isotherm is the same as Langmuir isotherm, and when g = 0, the model is the same as Henry's equation. The linear form of Redlich-Peterson may be written as (Wu et al 2010):…”

Section: Redlich-peterson Isothermmentioning

confidence: 99%

Impregnation of polyurethane foam with activated carbon for enhancing oil removal from water

Keshavarz

Zilouei

Abdolmaleki

et al. 2015

Int. J. Environ. Sci. Technol.

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To enhance the oil sorption capacity of polyurethane foam, different amounts of activated carbon (0.5, 1, 2 and 3 wt%) were grafted onto the surface of polyurethane foam. The modified polyurethane foam was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis and tensile elongation test. Grafting of activated carbon improved the polyurethane foam toughness and thermal resistance as revealed by tensile elongation and thermogravimetric tests, respectively. Experimental results showed the enhancement of oil sorption capacity and reduction in the water sorption in all cases. The optimal amount of activated carbon on the surface was 1 wt% which enhanced the oil sorption capacity up to 33.2 %. Reusability feature of the optimum sorbent was examined through four cycles of chemical regeneration, and about 85 % of the initial sorption capacity of the modified polyurethane foam was remained at the end. Equilibrium isotherms were analyzed using Langmuir, Freundlich and Redlich-Peterson isotherms using linear and nonlinear regression methods. The Marquardt's percent standard deviation and hybrid fractional error functions were minimized and normalized to investigate the effect of error criteria to determine the parameters of isotherms. The nonlinear method was found to be more accurate to determine the isotherm parameters, and the Langmuir isotherm was the best-fitting model.

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“…Known as the R-P isotherm, it is expressed by three parameters, q mon , a, and b RP , as shown in Eq. 8 (Wu et al 2010):…”

Section: Adsorption Equilibriummentioning

confidence: 99%

Influence of chlorine substitution on adsorption of gaseous chlorinated phenolics on multi-walled carbon nanotubes embedded in SiO2

Tulaphol

Bunsan²,

Kanchanatip

et al. 2016

Int. J. Environ. Sci. Technol.

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Multi-walled carbon nanotubes (MWCNTs) embedded in SiO 2 particles were prepared through the floating-catalyst chemical vapor deposition method. The parameters reaction time and flow rate of the carbon source (CH 4 ) were studied to obtain optimum conditions for MWCNT synthesis. The obtained MWCNTs were characterized by transmission electron microscopy, scanning electron microscopy, Raman spectroscopy, and Fourier transform infrared spectroscopy to confirm their morphology and crystallinity. The optimum conditions were a CH 4 flow rate of 100 ml/min in a H 2 -Ar mixture at a flow rate of 500 ml/min and a reaction time of 20 min. Under these conditions, MWCNTs with average outer and inner diameters of around 50 and 10 nm, respectively, were obtained. SiO 2 particles with embedded MWCNTs were studied for their adsorption of gaseous chlorinated phenolic compounds (CPCs), with emphasis on the effect of number of chlorine substituents. The CPC compounds of 2-chlorophenol (CP) and 2,4-dichlorophenol (DCP) were compared against phenol (P). Adsorption of P and CPCs on the particles fit well the Langmuir isotherm. The adsorption capacities of P, CP, and DCP on SiO 2 particles with embedded MWCNTs were found to be 3.12, 13.83, and 44.25 mg/g, respectively. Desorption activation energy was determined by thermogravimetric analysis. Chlorine substitution on P changed the adsorption process from physical to chemical adsorption. The particles showed high potential for use as a pre-concentration unit for solid-phase microextraction.

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A new linear form analysis of Redlich–Peterson isotherm equation for the adsorptions of dyes

Cited by 239 publications

References 100 publications

Modelling and Interpretation of Adsorption Isotherms

Modelling and Interpretation of Adsorption Isotherms

Impregnation of polyurethane foam with activated carbon for enhancing oil removal from water

Influence of chlorine substitution on adsorption of gaseous chlorinated phenolics on multi-walled carbon nanotubes embedded in SiO2

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