Equilibrium, kinetic and thermodynamic studies on the sorption of 4-hydroxyphenol on Cr-bentonite

Sorption isotherm and kinetic modeling of aniline on Cr-bentonite

“…Cr-bentonite was prepared using following method [14][15][16][17]: a complete mixing of 500 mL of 1 g/L Cr(NO 3 ) 3 solution and 5 g of Na-bentonite sample was performed in a 1000 mL plug-contained conical flask, and then the bottle was shaken in HZS-H water bath and constant temperature oscillator for 12 h at a speed of 150 rpm and a temperature of 25 ± 0.2 • C. Excessive Cr(NO 3 ) 3 was removed by deionized water washings until the supernatant was free of chromium ion, as tested by 1 mol/L NaOH solution. The Cr-bentonite prepared was dried at 70 • C and sieved using 200-mesh (75 m) sieve.…”

“…Cr-bentonite was found to be an effective and potential adsorbent for phenolic compounds and aniline [14][15][16][17]. The objective of this work was to investigate the sorption isotherm and kinetic modeling of aniline on Cr-bentonite and reveal the sorption characteristics of aniline on Cr-bentonite.…”

Heat of adsorption of surfactants and its role on nanoparticle stabilization

“…where K F1 and K F2 are Freundlich isotherm constants for the first and the second layer respectively, and n F is heterogeneity factor [52]. The adsorption process is considered favourable (i.e.…”

Green synthesis, characterization of biomaterial-supported zero-valent iron nanoparticles for contaminated water treatment

“…The separation factor R L (dimensionless quantity) provides basic information about essential features of Langmuir adsorption isotherm. If 0 < R L < 1, it is considered as favorable adsorption; if R L > 1, it is considered as unfavorable adsorption; if R L = 0, it is considered as irreversible adsorption; if R L = 1, it is considered as linear adsorption (Zheng et al 2008). The equation for R L is:…”

“…The experiments of adsorption kinetics of MB and aniline on the surface of sorbent (1:1:2) were carried out at room temperature and the data well fitted to the pseudo-second order kinetic model (Zheng et al 2008;Simin et al 2013) which can be expressed as:…”