EFFICIENT ADSORPTION OF Ce (III) ONTO POROUS CELLULOSE/GRAPHENE OXIDE COMPOSITE MICROSPHERES PREPARED IN IONIC LIQUID

A novel adsorbent made of porous cellulose/graphene oxide composite microspheres (PCGCM) was synthesized in [Bmim]Cl ionic liquid. The as-prepared PCGCM was evaluated for the removal of Ce (III) via static adsorption experiments. The results showed that the adsorption equilibrium of Ce (III) onto PCGCM was achieved within 50 min and the adsorption was highly pH dependent. An excellent adsorption capacity as high as 415.1 mg•g-1 was obtained at a pH of 4.9, which was much higher than most adsorbents reported in the literature. The pseudo-second order kinetic model and Langmuir isotherm model were found to fit the adsorption behavior of PCGCM well. The XPS analysis confirmed that the adsorption was based on the ion exchange mechanism. Meanwhile, PCGCM could be regenerated with 1 mol•L-1 HCl for repetitious adsorption of Ce (III). This work provides an attractive approach for the removal of rare earth ions as pollutants.

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Kinetics and adsorption equilibrium of some radionuclides on polyaniline/SiO2 composite

Radiochimica Acta ◽

10.1515/ract-2020-0014 ◽

2021 ◽

Vol 109 (2) ◽

pp. 85-97

Author(s):

Abeer E. Kasem ◽

Ezzat A. Abdel-Galil ◽

Nabil Belacy ◽

Nagwa A. Badawy

Keyword(s):

Adsorption Equilibrium ◽

Sorption Process ◽

Sorption Kinetics ◽

Sorption Behavior ◽

Order Kinetic ◽

Maximum Sorption Capacity ◽

Maximum Sorption ◽

Order Kinetic Model ◽

Langmuir Isotherm Model ◽

Pseudo Second Order

Abstract The sorption kinetics and equilibrium isotherms of zirconium, uranium, and molybdenum ions onto synthetic polyaniline/SiO2 composite (PAn/SiO2) have been studied using batch-sorption techniques. This study was carried out to examine the sorption behavior of the PAn/SiO2 for the removal of Zr(IV), U(VI), and Mo(VI) ions from an aqueous solution. The influence of some parameters on the sorption process was also studied. The maximum sorption for Zr(IV), U(VI), and Mo(VI) ions was achieved at 60 min shaking time. Langmuir isotherm model is the most representative for discussing the sorption process with a maximum sorption capacity of 24.26, 21.82, and 13.01 mg/g for Zr(IV), U(VI), and Mo(VI) ions, respectively. Kinetic modeling revealed that the sorption of all ions follows the pseudo-second-order kinetic model. The results demonstrated that both the external and intra-particular diffusion are taken into account in determining the sorption rate. Thermodynamic parameters like ΔG°, ΔH°, and ΔS° for the sorption process were evaluated. The synthetic composite has been successfully applied for the removal and recovery of U(VI) ions from real solution (monazite leachate) using a chromatographic column packed with PAn/SiO2 composite with a breakthrough capacity equal to 239.70 mg/g.

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Adsorption of enrofloxacin from aqueous solution by bentonite

Clay Minerals ◽

10.1180/claymin.2013.048.4.16 ◽

2013 ◽

Vol 48 (4) ◽

pp. 627-637 ◽

Cited By ~ 3

Author(s):

J. X. Zhang ◽

Q. X. Zhou ◽

W. Li

Keyword(s):

Aqueous Solution ◽

Contact Time ◽

Adsorption Equilibrium ◽

Order Kinetic ◽

Batch Experiments ◽

Freundlich Model ◽

Order Kinetic Model ◽

Langmuir Isotherm Model ◽

Pseudo Second Order ◽

Better Than

AbstractThe removal of enrofloxacin, a fluoroquinolone antibiotic, from aqueous solution by adsorption onto bentonite was investigated in this study. The effects of initial concentrations, contact time and temperature on the adsorption of enrofloxacin were studied via batch experiments. The adsorption equilibrium was achieved within 60 min for all studied concentrations. The adsorption capacity increased with the increase of initial concentration within a concentration range. Higher temperatures were favourable for the adsorption. The change of Gibbs free energy (ΔG°), change of enthalpy (ΔH°) and change of entropy (ΔS°) were evaluated and the results indicate that the adsorption should be an endothermic and spontaneous process. The Langmuir isotherm model fitted to the experimental data better than the Freundlich model. The adsorption follows the pseudo-second order kinetic model.

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Study on the adsorption of methylene blue from aqueous solution using hydrogel glucomannan/graphene oxide

Vietnam Journal of Catalysis and Adsorption ◽

10.51316/jca.2021.010 ◽

2021 ◽

Vol 10 (1) ◽

pp. 59-66

Author(s):

Son Le Lam ◽

Phu Nguyen Vinh ◽

Hieu Le Trung ◽

Tan Le Thua ◽

Nhan Dang Thi Thanh ◽

...

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Graphene Oxide ◽

Adsorption Capacity ◽

Organic Dyes ◽

Dye Adsorption ◽

Order Kinetic ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Pseudo Second Order

Glucomannan/graphene oxide (GM/GO) hydrogel was synthesized by using calcium hydroxide as the crosslinker. The synthesized material was characterized by using IR, XRD, SEM, EDX and RAMAN technology. The composite hydrogel was used for removal of organic dyes from aqueous solution. The results showed that the GM/GO hydrogel had a porous structure and a high adsorption capacity toward methylene blue (MB). The pseudo-second-order kinetic model could fit the rate equation of MB adsorption onto the GM/GO hydrogel. The adsorption of MB onto GM/GO hydrogel was a spontaneous process. In addition, the equilibrium adsorption isotherm data indicated that equilibrium data were fitted to the Langmuir isotherm and the maximum dye adsorption capacity was 198,69 mg.g-1. Moreover, the hydrogel was stable and easily recovered and adsorption capacity was around 97% of the initial saturation adsorption capacity after being used five times.

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Construction of Novel Polymerizable Ionic Liquid Microemulsions and the In Situ Synthesis of Poly(Ionic Liquid) Adsorbents

Nanomaterials ◽

10.3390/nano9030454 ◽

2019 ◽

Vol 9 (3) ◽

pp. 454 ◽

Cited By ~ 2

Author(s):

Aili Wang ◽

Shuhui Li ◽

Hou Chen ◽

Ying Liu ◽

Xiong Peng

Keyword(s):

Ionic Liquid ◽

Adsorption Process ◽

Freundlich Isotherm ◽

In Situ Synthesis ◽

Scattering Data ◽

Order Kinetic ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Poly Ionic Liquid

This paper reports the successful construction of novel polymerizable ionic liquid microemulsions and the in situ synthesis of poly(ionic liquid) adsorbents for the removal of Zn2+ from aqueous solution. Dynamic light-scattering data were used to confirm the polymerization media and to illustrate the effect of the crosslinker dosage on the droplet size of the microemulsion. FTIR and thermal analysis were employed to confirm the successful preparation of the designed polymers and characterize their thermostability and glass transition-temperature value. The optimization of the adsorption process indicates that the initial concentration of Zn2+, pH, adsorbent dosage and contact time affected the adsorption performance of poly(ionic liquid)s toward Zn2+. Furthermore, our research revealed that the adsorption process can be effectively described by the pseudo second-order kinetic model and the Freundlich isotherm model.

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Fast Removal of Pb2+ from Aqueous Solution by Water Insoluble Konjac Glucomannan

Materials Science Forum ◽

10.4028/www.scientific.net/msf.610-613.65 ◽

2009 ◽

Vol 610-613 ◽

pp. 65-68 ◽

Cited By ~ 3

Author(s):

Xue Gang Luo ◽

Feng Liu ◽

Xiao Yan Lin

Keyword(s):

Aqueous Solution ◽

Correlation Coefficients ◽

Konjac Glucomannan ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Order Kinetic Model ◽

Langmuir Isotherm Model ◽

Pseudo Second Order ◽

Equilibrium Process ◽

Fast Removal

Konjac glucomannan (KGM) was converted into water insoluble konjac glucomannan (WIKGM) by treating with NaOH through completely deacetylated reaction. Adsorption study was carried out for the adsorption of Pb2+ from aqueous solution using water insoluble konjac glucomannan. The influences of pH, contact time, temperature and initial Pb2+ concentration on the absorbent were studied. Results of kinetic data showed that the Pb2+ adsorption rate was fast and good correlation coefficients were obtained for the pseudo second-order kinetic model. The equilibrium process was described well by the Langmuir isotherm model with maximum adsorption capacity of 9.18 mg/g on WIKGM at 25°C.

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Alkaline deoxygenated graphene oxide as adsorbent for cadmium ions removal from aqueous solutions

Water Science & Technology ◽

10.2166/wst.2015.124 ◽

2015 ◽

Vol 71 (11) ◽

pp. 1611-1619 ◽

Cited By ~ 4

Author(s):

Jun Liu ◽

Hongyan Du ◽

Shaowei Yuan ◽

Wanxia He ◽

Pengju Yan ◽

...

Keyword(s):

Graphene Oxide ◽

Aqueous Solutions ◽

Batch Adsorption ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Transmission Electron ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Ft Ir

Alkaline deoxygenated graphene oxide (aGO) was prepared through alkaline hydrothermal treatment and used as adsorbent to remove Cd(II) ions from aqueous solutions for the first time. The characterization results of transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and Fourier transform infrared (FT-IR) spectra indicate that aGO was successfully synthesized. The batch adsorption experiments showed that the adsorption kinetics could be described by the pseudo-second-order kinetic model, and the isotherms equilibrium data were well fitted with the Langmuir model. The maximum adsorption capacity of Cd(II) on aGO was 156 mg/g at pH 5 and T = 293 K. The adsorption thermodynamic parameters indicated that the adsorption process was a spontaneous and endothermic reaction. The mainly adsorption mechanism speculated from FT-IR results may be attributed to the electrostatic attraction between Cd2+ and negatively charged groups (–CO−) of aGO and cation-π interaction between Cd2+ and the graphene planes. The findings of this study demonstrate the potential utility of the nanomaterial aGO as an effective adsorbent for Cd(II) removal from aqueous solutions.

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Adsorption of tricresyl phosphate onto graphene nanomaterials from aqueous solution

Water Science & Technology ◽

10.2166/wst.2017.317 ◽

2017 ◽

Vol 76 (6) ◽

pp. 1565-1573 ◽

Cited By ~ 1

Author(s):

Jun Liu ◽

Siying Xia ◽

Xiaomeng Lü ◽

Hongxiang Shen

Keyword(s):

Experimental Data ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Tricresyl Phosphate ◽

Batch Mode ◽

Order Kinetic Model ◽

Endothermic Process ◽

Langmuir Isotherm Model ◽

Pseudo Second Order ◽

Increasing Temperature

Phosphorus flame retardant tricresyl phosphate (TCP) adsorption on graphene nanomaterials from aqueous solutions was explored using batch and column modes. Comparative studies were performed regarding the kinetics and equilibrium of TCP adsorption on graphene oxide (GO) and graphene (G) in batch mode. The adsorption kinetics exhibited a rapid TCP uptake, and experimental data were well described by the pseudo-second-order kinetic model. Adsorption isotherm data of TCP on the two adsorbents displayed an improved TCP removal performance with increasing temperature at pH 5, while experimental data were well described by the Langmuir isotherm model with a maximum adsorption capacity of 87.7 mg·g−1 for G, and 30.7 mg·g−1 for GO) at 303 K. The thermodynamic parameters show that the adsorption reaction is a spontaneous and endothermic process. In addition, dynamic adsorption of TCP in a fixed G column confirmed a faster approach to breakthrough at high flow rate, high influent TCP concentration, and low filling height of adsorbent. Breakthrough data were successfully described by the Thomas and Yoon-Nelson models.

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Adsorption mechanism of As(V) and As(III) on Fe–Mn binary oxides in synthetic and real water matrices

Water Science & Technology Water Supply ◽

10.2166/ws.2016.015 ◽

2016 ◽

Vol 16 (4) ◽

pp. 992-1001 ◽

Cited By ~ 4

Author(s):

Jasmina Nikić ◽

Jasmina Agbaba ◽

Malcolm Watson ◽

Snežana Maletić ◽

Jelena Molnar Jazić ◽

...

Keyword(s):

Adsorption Mechanism ◽

Adsorption Equilibrium ◽

Order Kinetic ◽

Freundlich Isotherms ◽

Binary Oxides ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Adsorption Equilibrium Data ◽

The Eu

A series of Fe–Mn binary oxides with different Fe:Mn ratios (1:1, 3:1, 6:1, 9:1) were synthesized to investigate the optimal Fe:Mn ratio for the removal of As(III) and As(V). Batch experiments were performed to determine the rate of adsorption and equilibrium isotherms. Adsorption kinetics were well described by the pseudo-second-order kinetic model for both As(III) and As(V). The adsorption equilibrium data fitted well to Langmuir and Freundlich isotherms. The maximum As(V) sorption capacity was observed at an Fe:Mn ratio of 6:1 (65.0 mg/g), whereas maximum As(III) uptake was at Fe:Mn ratio 3:1 (46.9 mg/g). Arsenic levels in real water samples were reduced from 37 μg/l to below the EU Water Framework Directive limit (10 μg/L) after treatment with Fe–Mn adsorbents.

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Comparison of Adsorptive Removal of Total Nitrogen (T-N) and Total Phosphorous (T-P) in Aqueous Solution using Granular Activated Charcoal (GAC)

JOURNAL OF ADVANCES IN CHEMISTRY ◽

10.24297/jac.v9i1.2306 ◽

2013 ◽

Vol 9 (1) ◽

pp. 1822-1836

Author(s):

Keon Sang Ryoo ◽

Jong-Ha Choi ◽

Yong Pyo Hong

Keyword(s):

Aqueous Solution ◽

Kinetic Model ◽

Adsorption Capacity ◽

Total Nitrogen ◽

Activated Charcoal ◽

Adsorption Equilibrium ◽

Order Kinetic ◽

Total Phosphorous ◽

Order Kinetic Model ◽

Pseudo Second Order

The present study is to explore the possibility of utilizing granular activated charcoal (GAC) for the removal of total phosphorous (T-P) and total nitrogen (T-N) in aqueous solution. Batch adsorption studies were carried out to determine the influences of various factors like initial concentration, contact time and temperature. The adsorption data showed that GAC has a similar adsorption capacity for both T-N and T-P. The adsorption degree of T-N and T-P on GAC was highly concentration dependent. It was found that the adsorption capacity of GAC is quite favorable at a low concentration. At concentrations of 1.0 mg L-1 of T-P and 2.0 mg L-1 of T-N, approximately 97 % of adsorption was achieved by GAC. The equilibrium data were fitted well to the Langmuir isotherm model. The pseudo-second-order kinetic model appeared to be the better-fitting model because it has higher R2 compared with the pseudo-first-order and intra-particle kinetic model. The theoretical adsorption equilibrium qe,cal from pseudo-second-order kinetic model were relatively similar to the experimental adsorption equilibrium qe,exp. To evaluate the effect of thermodynamic parameters at different temperatures, the change in free energy ΔG, the enthalpy ΔH and the entropy ΔS were estimated. Except for adsorption of T-P at 278 K, the ΔG values obtained were all negative at the investigated temperatures. It indicates that the present adsorption system occurs spontaneously. The adsorption process of T-N by GAC was exothermic in nature, whereas T-P showed endothermic behavior. In addition, the positive values of ΔS imply that there was the increase in the randomness of adsorption of T-N and T-P at GAC-solution interface.

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Synthesis of Reusable Cyclodextrin Polymers for Removal of Naphthol and Naphthylamine from Water

10.21203/rs.3.rs-561607/v1 ◽

2021 ◽

Author(s):

Weifeng Xu ◽

Xiang Liu ◽

Jianzhe Cai ◽

Tiemeng Xue ◽

Kewen Tang

Keyword(s):

Adsorption Equilibrium ◽

Order Kinetic ◽

Naphthalene Derivatives ◽

Initial Concentration ◽

Low Concentration ◽

Adsorption Temperature ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Cyclodextrin Polymers ◽

The Impact

Abstract As one group of important naphthalene derivatives, naphthol and naphthylamine, are diffusely employed as dye intermediates. The presence of naphthol and naphthylamine in water systems may pose risks to the environment and public health due to their carcinogenicity. In this study, four mesoporous polymers prepared by β-cyclodextrin derivatives and tetrafluoroterephthalonitrile were obtained, and applied to deal with 1-naphthylamine, 2-naphthylamine, 1-naphthol, and 2-naphthol from water. The impact of adsorption time, initial concentration of naphthol and naphthylamine, and temperature on the adsorption efficiency of the four polymers were explored separately. The four polymers present fast adsorption kinetics towards naphthol and naphthylamine, attaining 93%~100% of adsorption equilibrium uptake for 1-naphthol, 1-naphthylamine, 2-naphthylamine in 15 min, and 87%~90% of equilibrium uptake for 2-naphthol in 15 min. The kinetics could be depicted well by the pseudo-second-order kinetic model. The adsorption isotherms of the four polymers towards naphthol and naphthylamine accord with Redlich-Peterson or Sips model. The adsorption ratio increases fast with reducing the initial concentration of naphthol and naphthylamine, which suggest that these polymers are applicable to removing low concentration of naphthol and naphthylamine from water. The adsorption ratio of naphthol and naphthylamine in 5 mg/L, can achieve over 95% in 25 oC. In addition, the four polymers can be effortlessly recovered by a gentle and simple washing procedure with little reduction in performance. The adsorption performance of the four polymers towards the four naphthalene derivatives can be improved by increasing the adsorption temperature. In conclusion, the prepared β-cyclodextrin polymers exhibit rapid water treatment in removing the four low-concentration naphthalene derivatives with convenient regeneration and good reusability.

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