Removal of phosphate anions using the modified chitosan beads: Adsorption kinetic, isotherm and mechanism studies

Liu, Xin; Zhang, Lingfan

doi:10.1016/j.powtec.2015.02.055

Cited by 309 publications

(106 citation statements)

References 38 publications

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“…The results demonstrated that the adsorption process of NOR on biochars was rapid at the start, then the adsorption increased slowly until the plateau of adsorption equilibrium was achieved. The fast adsorption rate at the initial stage could be attributed to the increase of driving force caused by the concentration gradient of NOR in aqueous solutions and the existence of large available active sites on the surface of biochars (Liu and Zhang 2015). Equilibrium was attained at about 8 h for all samples except for BC550, which took about 24 h, which was slower than other adsorbents (Sui et al 2012).…”

Section: Biochar Propertiesmentioning

confidence: 95%

Adsorption Characteristics of Norfloxacin by Biochar Prepared by Cassava Dreg: Kinetics, Isotherms, and Thermodynamic Analysis

Feng¹,

Yu²,

Deng³

et al. 2015

BioResources

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Biochars (BC) generated from biomass residues have been recognized as effective sorbents for organic compounds. In this study, biochars as adsorbents for the removal of norfloxacin (NOR) from aqueous solutions were evaluated. Biochars were prepared from cassava dregs at 350 °C, 450 °C, 550 °C, 650 °C, and 750 °C, respectively (labeled as BC350, BC450, BC550, BC650, and BC750). The results showed that the kinetic data were best fitted to the pseudo second-order model, indicating that the sorption was governed by the availability of sorption sites on the biochar surfaces rather than the NOR concentration in the solution. Sorption isotherms of NOR were well described by the Freundlich model, and the Freundlich coefficients (lgkF) increased with the pyrolysis temperature of biochars. Thermodynamic analysis indicated the feasibility and spontaneity of the NOR adsorption process. The NOR adsorption on BC450, BC550, BC650, and BC750 was an endothermic process, while an exothermic process occurred for BC350. FTIR studies further suggested that the adsorption mechanism was possibly attributable to H-bond and π-π interactions between NOR and biochars. Overall, this work constitutes a basis for further research considering the bioavailability and toxicity of antibiotics in the presence of biochar.

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Section: Biochar Propertiesmentioning

confidence: 95%

Adsorption Characteristics of Norfloxacin by Biochar Prepared by Cassava Dreg: Kinetics, Isotherms, and Thermodynamic Analysis

Feng¹,

Yu²,

Deng³

et al. 2015

BioResources

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“…The fast adsorption rate at the incipient stage could be attributed to the increase of driving force provided by the concentration gradient of MB in aqueous solutions and the existence of the great number of available active sites on the surface of porous biochar (Olgun et al 2013). These results suggested that both physical and chemical adsorption might be involved in the adsorption process (Liu and Zhang 2015). …”

Section: Adsorption Kineticsmentioning

confidence: 95%

Removal of Methylene Blue from Aqueous Solution using Porous Biochar Obtained by KOH Activation of Peanut Shell Biochar

Han¹,

Chu²,

Liu³

et al. 2015

BioResources

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aBiochar from peanut shell was used as the precursor for the preparation of porous biochar by KOH activation. The pore structures of porous biochar also were characterized by scanning electron microscopy (SEM) and N2 adsorption/desorption. The adsorption performance for the removal of methylene blue (MB) was deeply investigated. The effects of impregnation ratio (KOH/biochar: w/w), activation temperature, and activation time on the removal of methylene blue by porous biochar were evaluated. In addition, the effects of initial MB concentration and pH value on the adsorption process were also studied. The optimum conditions for preparing porous biochar were obtained with 1.5:1 of impregnation ratio, 800 °C of activation temperature, and 90 min of the holding time in activation. Results indicated that the adsorption capacity was high even at higher initial MB concentrations. The adsorption process followed pseudosecond-order kinetics. The experimental adsorption isotherm was found to be best fitted with the Langmuir model, which implying that the adsorption of MB by porous biochar proceeded as a monolayer adsorption, and the maximum monolayer adsorption capacity of MB was 208 mg•g -1 .

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“…In order to understand the characteristics of the adsorption process, three kinetic models detailed in the supplementary data, including pseudo-first-order [33], pseudo-second-order [34], and Weber-Morris kinetic models [35] were applied to fit the experimental data obtained from the single adsorption system (Fig. 2(d) and Fig.…”

Section: Effect Of Contact Timementioning

confidence: 99%

Investigation on the efficiency and mechanism of Cd(II) and Pb(II) removal from aqueous solutions using MgO nanoparticles

Xiong

Wang

Tan

et al. 2015

Journal of Hazardous Materials

231

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Removal of phosphate anions using the modified chitosan beads: Adsorption kinetic, isotherm and mechanism studies

Cited by 309 publications

References 38 publications

Adsorption Characteristics of Norfloxacin by Biochar Prepared by Cassava Dreg: Kinetics, Isotherms, and Thermodynamic Analysis

Adsorption Characteristics of Norfloxacin by Biochar Prepared by Cassava Dreg: Kinetics, Isotherms, and Thermodynamic Analysis

Removal of Methylene Blue from Aqueous Solution using Porous Biochar Obtained by KOH Activation of Peanut Shell Biochar

Investigation on the efficiency and mechanism of Cd(II) and Pb(II) removal from aqueous solutions using MgO nanoparticles

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