Showing papers on "Langmuir published in 2008"
TL;DR: In this paper, the adsorption behavior of C.I. Reactive Blue 2, reactive red 4, and reactive yellow 2 from aqueous solution onto activated carbon was investigated under various experimental conditions.
1,097 citations
TL;DR: Coconut husk-based activated carbon was shown to be a promising adsorbent for removal of methylene blue from aqueous solutions and was found to follow closely the pseudo-second-order kinetic model.
995 citations
TL;DR: The ability of coconut bunch waste, an agricultural waste available in large quantity in Malaysia, to remove basic dye from aqueous solution by adsorption was studied and fitted very well the pseudo-second-order kinetic model.
578 citations
557 citations
TL;DR: The results proved that the prepared activated carbon was an effective adsorbent for removal of phenol from aqueous solution.
535 citations
TL;DR: Locally available adsorbents were found to be low-cost and promising for the removal of Cu (II) from aqueous solution and the kinetics and the factors controlling the adsorption process were studied.
523 citations
TL;DR: In this article, the effective removal of heavy metals from aqueous wastes is among the most important issues for many industrialized countries, and the results indicate that the second-order model best describes adsorption kinetic data.
493 citations
TL;DR: In this article, the effects of contact time, initial pH and initial dye concentration on the malachite green adsorption by the bentonite have been studied, and it was shown that the removal was seen to increase with increasing contact time.
493 citations
TL;DR: In this paper, the use of chitosan beads, CHA 1:1, 2:1 ratio beads, and CHA alginate beads for the removal of Cu(II) ions from aqueous solution at different initial pH, agitation periods, adsorbent dosage, and initial concentrations has been investigated.
489 citations
TL;DR: In this article, the effect of surface properties on phenol adsorption in aqueous phase onto activated carbons (ACs) having different textural and surface properties has been considered.
484 citations
TL;DR: Evaluation of experimental data showed that the biosorption of Cd(II) C. virgatum was feasible, spontaneous and exothermic at 293-323 K, and followed well pseudo-second-order kinetics.
TL;DR: Results indicated that no arsenic was found in the effluent solution up to about 40 and 120 bed volumes of As(III) and As(V), respectively, and Sodium hydroxide solution (0.1M) was found to be capable of regenerating the column bed.
TL;DR: In this paper, activated carbon was prepared from hazelnut husks with zinc chloride activation at 973 K in nitrogen atmosphere and the activation surface area was found 1092 m2g−1.
TL;DR: In this article, bagasse pith has been used as a raw material for the preparation of different activated carbons for the removal of reactive orange (RO) dye from aqueous solutions and batch adsorption experiments were performed as a function of initial dye concentration, contact time, adsorbent dose and pH.
TL;DR: This technique for syntheses of the crosslinked chitosans with epichlorohydrin via the homogeneous reaction in aqueous acetic acid solution showed that the adsorptions of three metal ions in aQueous solution were followed the monolayer coverage of the adsorbents through physical adsorption phenomena.
TL;DR: The correlation results suggested that the pseudo-second-order model was the best choice among all the kinetic models to describe the adsorption behavior of Au(III), Pt(IV) and Pd(II) onto GMCCR.
TL;DR: In this article, the feasibility of activated carbon prepared from oil palm shell to remove methylene blue from aqueous solutions was investigated through batch and column studies, and the equilibrium data were best represented by the Langmuir isotherm model, with maximum monolayer adsorption capacity of 243.90 mg/g at 30°C.
TL;DR: The error analysis showed that the Langmuir model described best the dye adsorption data, compared with other models, and both linear regression method and non-linear error functions provided the best-fit to experimental data.
TL;DR: In this article, the effects of contact time and initial dye concentration on the removal of basic dyes from aqueous solutions using a cyclodextrin polymer were analyzed using pseudo-second order kinetics, mass transfer, and intraparticle diffusion models.
TL;DR: X-ray powder diffraction data indicates that 1d possesses a substantially different structure, but converts back to 1 upon exposure to DEF, consistent with the presence of a flexible framework, and variable-temperature kinetics measurements have allowed the first study of H2 diffusion within a metal-organic framework.
Abstract: Reaction of Co(CF3SO3)2 with the new molecule 1,4-benzenedi(4′-pyrazolyl) (H2BDP) in N,N′-diethylformamide (DEF) at 130 °C generates the metal−organic framework Co(BDP)·2DEF·H2O (1). X-ray analysis reveals the structure of 1 to contain chains of tetrahedrally ligated Co2+ ions linked through BDP2− ligands to generate a three-dimensional framework with 10 × 10 A2 channels. Thermogravimetric data shows the framework to have a high thermal stability, and complete desolvation occurs upon heating at 170 °C under dynamic vacuum for two days to afford 1d. X-ray powder diffraction data indicates that 1d possesses a substantially different structure, but converts back to 1 upon exposure to DEF, consistent with the presence of a flexible framework. Nitrogen adsorption isotherms measured for 1d at 77 and 87 K reveal an unprecedented five-step adsorption process and a Langmuir surface area of 2670 m2/g. In addition, high-pressure H2 adsorption data reveal hysteretic uptake and release, with hysteresis loops of width ...
TL;DR: The results show that the produced activated carbon from olive stone is an alternative low-cost adsorbent for removing Cd(II) ions from aqueous solutions by adsorption.
TL;DR: The yellow passion fruit, a powdered solid waste, was tested as biosorbent for the removal of a cationic dye, methylene blue (MB), from aqueous solutions and adsorption of MB was favorable.
TL;DR: The results have established good potentiality for kaolinite and montmorillonite to remove heavy metals like Pb(II), Cd(II) and Ni( II) from aqueous medium through adsorption-mediated immobilization.
TL;DR: In this article, the authors compared the adsorption capacity of different types of activated carbons produced by steam activation in small laboratory scale and large industrial scale processes and found that activated carbon has the highest adsorptive capacity towards MB dye (588 ǫmg/g), followed by F400 (476 milligrams/g) and PAC1 (380 milligram/g).
TL;DR: It was shown that the adsorbent mass/treated effluent volume ratios using the Langmuir isotherm could be described by the pseudo second-order equation.
TL;DR: The results indicate that chitosan is suitable as adsorbent material for adsorption of reactive dye form aqueous solutions, and demonstrates that intraparticle diffusion plays a significant role in the adsorptive mechanism.
TL;DR: The effects of pH, contact time and temperature on adsorption of Cr(VI) were investigated in this paper, where the pore properties including the BET surface area, pore volume and pore size distribution and average pore diameter were characterized.
TL;DR: Experimental data suggest that the adsorption of direct dyes onto CNTs involved intraparticle diffusion, but that was not the only rate-controlling step, and the values of DeltaH(0), DeltaG(0) and E all indicate that the adhesion of Direct Yellow 86 and DR224 was a physisorption process.
TL;DR: In this paper, the adsorption of Cu(II) ions from aqueous solution by rubber (Hevea brasiliensis ) leaf powder (RHBL) was studied in a batch adaption system.
TL;DR: In this paper, the effect of adsorption of Ni (II) ions on aqueous solutions through removal of nickel (II), on to biopolymer sorbents, such as calcium alginate (CA), CCCA and chitosan coated silica (CCS), was studied using equilibrium batch and column flow techniques.