Equilibrium, thermodynamics and process design to minimize adsorbent amount for the adsorption of acid dyes onto cationic polymer-loaded bentonite

Li, Qian; Yue, Qinyan; Su, Yuan; Sun, Hongjian

doi:10.1016/j.cej.2010.01.033

Cited by 176 publications

(50 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…With their large charge/mass ratio, the cationic polymers can easily saturate the bentonite's CEC and change the interlayer environment of the bentonite. As a result, the resulting sorbents could effectively remove anionic dyes from water [29,30]. This enlightens us that cationic polymers might be used to adjust the packing density of the organic cations, and thus improve the sorption capacity of the resulting organobentonites.…”

Section: Introductionmentioning

confidence: 97%

Structural and sorptive characteristics of the cetyltrimethylammonium and polyacrylamide modified bentonite

Wang

Zhu

et al. 2010

Chemical Engineering Journal

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 97%

Structural and sorptive characteristics of the cetyltrimethylammonium and polyacrylamide modified bentonite

Wang

Zhu

et al. 2010

Chemical Engineering Journal

View full text Add to dashboard Cite

“…where n and K F are Fruendlich constants related to adsorption intensity of the adsorbent and adsorption capacity, respectively (Li et al 2010). The correlation coefficient (R 2 ) values demonstrate that the adsorption isotherm for the present system is explained better by Fruendlich model (R 2 = 0.8312) ( Table 1).…”

Section: Fruendlich Isothermmentioning

confidence: 85%

“…For this reason, researches have focused on the usage of low-cost, locally available, reusable, biodegradable adsorbents made from natural sources like rice hull shell (Wang et al 2010), wood apple shell (Jain and Jayaram 2010), fly ash ) and powdered peanut hull (Gong et al 2005). Natural and modified clays like sepiolite (Eren et al 2010), zeolite (Mustafaa et al 2010), perlite (Dogan et al 2004) and bentonite (Li et al 2010) are being considered as alternative low-cost adsorbents (Rafatullah et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of C.I. Acid Red 97 dye from aqueous solution onto walnut shell: kinetics, thermodynamics parameters, isotherms

Mokri

Modirshahla

Behnajady

et al. 2014

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

This study aims to investigate the adsorption of C.I. Acid Red 97 (AR97) onto walnut shell (WS) in order to find out the desired conditions. The effect of operational parameters including adsorbent dosage, agitation speed, contact time, pH and temperature was studied in a batch mode. The results revealed that 73.33 % of AR97 (50 mg/ L) was decolorized at 60 min of contact time, agitation rate of 140 rpm and 12 g/L of adsorbent at 291 K. The rate of adsorption follows pseudo-second-order kinetics with the high correlation coefficient, which was more than 0.99. Specific surface area of WS was calculated as 1.28 m 2 /g by BET method. It was observed from the values of thermodynamics parameters such as Gibbs free energy (DG°), enthalpy (DH°) and entropy (DS°) that the nature of adsorption process is spontaneous, exothermic and mainly physical. Langmuir, Fruendlich and Redlich-Peterson isotherms were applied for mathematical description of equilibrium data and findings indicated that it is in good agreement with Fruendlich model.

show abstract

“…Gibbs free energy values from À20 to À40 kJ/mol show that both physisorption and chemisorption occur. [43,44] Negative values of Gibbs free energy, as seen in Table 3, show that the Hg 0 adsorption process on the KI clays is thermodynamically achievable, spontaneous, and corresponds to a process involving both physisorption and chemisorption mechanisms. Moreover, the decrease in DG values with increases in temperature indicates that higher adsorption was obtained at higher temperatures.…”

Section: Determination Of Thermodynamic Parametersmentioning

confidence: 95%

Kinetics study on the capture of elemental mercury in flue gas by KI‐impregnated clays

Shen

Chen

et al. 2015

Can J Chem Eng

View full text Add to dashboard Cite

To understand the capture of elemental mercury (Hg 0 ) on potassium iodide-impregnated clays, a variety of kinetic models including pseudo-firstorder, pseudo-second-order, Elovich, and intraparticle diffusion models were used to analyze the experimental data and discuss the mechanism. A strong correlation was observed between the pseudo-second-order kinetic model and the experimental data for a range of parameters (KI loading, adsorption temperatures, and O 2 concentrations). This suggests that chemisorption may be a rate-limiting mechanism during the adsorption process on KI clays. Further, the results of the pseudo-first-order model and the intraparticle diffusion model both indicate that mass transfer limitations should not be ignored during the initial stage of adsorption. Thermodynamic investigation shows that the adsorption reaction of Hg 0 on the KI clays is inherently spontaneous and endothermic, corresponding to a process involving both physisorption and chemisorption, and the chemisorption is the dominant adsorption.

show abstract

Equilibrium, thermodynamics and process design to minimize adsorbent amount for the adsorption of acid dyes onto cationic polymer-loaded bentonite

Cited by 176 publications

References 48 publications

Structural and sorptive characteristics of the cetyltrimethylammonium and polyacrylamide modified bentonite

Structural and sorptive characteristics of the cetyltrimethylammonium and polyacrylamide modified bentonite

Adsorption of C.I. Acid Red 97 dye from aqueous solution onto walnut shell: kinetics, thermodynamics parameters, isotherms

Kinetics study on the capture of elemental mercury in flue gas by KI‐impregnated clays

Contact Info

Product

Resources

About