Adsorption of copper ion on magnetite-immobilised chitin

The adsorption of Cu2 + from aqueous solution by magnetite-immobilised chitin (MC) was studied in batch mode. Two conventional adsorbents, cation exchange resin (CER) and activated carbon (AC) were used for the comparison. The physicochemical parameters including pH, concentration of adsorbent, temperature and initial Cu2 + concentration were optimised. Under the optimised conditions, the removal efficiencies of Cu2 + for MC, CER and AC were 91.67, 93.36 and 89.16%, respectively. In addition, the removal capacities of Cu2 + for MC, CER and AC were 56.71, 74.84 and 6.55 mg/g, respectively. The adsorption isotherm studies indicated that the adsorptive behaviour of Cu2 + on three adsorbents could be well described by the Langmuir model. The maximum adsorption capacities (qmax) for MC, CER and AC were 53.19, 89.29 and 5.82 mg/g, respectively. The applicability of the kinetic model has been investigated for MC. Experimental results indicated that a pseudo-second-order reaction model provided the best description of the data with a correlation coefficient 0.999 for different initial Cu2 + concentrations. The rate constants were also determined. Various thermodynamic parameters such as standard free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) were calculated for predicting the adsorption nature of MC. The results indicated that this system was a spontaneous and endothermic process.

Download Full-text

Adsorption of As(V) and As(III) from aqueous solution by lepidocrocite (γ-FeOOH) nanoparticle

Science and Technology Development Journal ◽

10.32508/stdj.v19i4.598 ◽

2016 ◽

Vol 19 (4) ◽

pp. 270-281

Author(s):

Trung Dinh Nguyen ◽

Phuong Dong Truong

Keyword(s):

Adsorption Equilibrium ◽

Reaction Model ◽

Precipitation Method ◽

Second Order Reaction ◽

High Adsorption ◽

Freundlich Isotherms ◽

Adsorption Capacities ◽

Adsorption Data ◽

Pseudo Second Order ◽

Co Precipitation

γ-FeOOH nanorods an adsorbent for As(V) and As(III) removal was prepared by a chemical co-precipitation method. The maximum adsorption capacities at pH6 for As(V) and As(III) were 63.75 and 88.99 mg/g, respectively, higher than those of Fe2O3, Fe3O4... The adsorption data accorded with Freundlich isotherms. At the study pH, for arsen, the adsorption equilibrium was gained after 90 min. Kinetic data fitted well to the pseudo-second-order reaction model. The adsorption of γ-FeOOH for As (V) and As(III) could be competed by some other ion such as sulfate, ammonium and chloride. The high adsorption capability and good performance on other aspects make the γ-FeOOH nanorod a promissing adsorbent for the removal of As (V) and As(III) from the groundwater.

Download Full-text

Adsorptive Removal of Cd, Cu, Ni and Mn from Environmental Samples Using Fe3O4-Zro2@APS Nanocomposite: Kinetic and Equilibrium Isotherm Studies

Molecules ◽

10.3390/molecules26113209 ◽

2021 ◽

Vol 26 (11) ◽

pp. 3209

Author(s):

Aphiwe Siyasanga Gugushe ◽

Anele Mpupa ◽

Tshimangadzo Saddam Munonde ◽

Luthando Nyaba ◽

Philiswa Nosizo Nomngongo

Keyword(s):

Electron Microscopy ◽

Magnetic Nanomaterials ◽

Batch Mode ◽

X Ray ◽

Freundlich Isotherms ◽

Adsorption Capacities ◽

Transmission Electron ◽

Equilibrium Data ◽

Pseudo Second Order ◽

Wastewater Samples

In this study, Fe3O4-ZrO2 functionalized with 3-aminopropyltriethoxysilane (Fe3O4-ZrO2@APS) nanocomposite was investigated as a nanoadsorbent for the removal of Cd(II), Cu(II), Mn (II) and Ni(II) ions from aqueous solution and real samples in batch mode systems. The prepared magnetic nanomaterials were characterized using X-ray powder diffraction (XRD), scanning electron microscopy/energy dispersion x-ray (SEM/EDX) Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). Factors (such as adsorbent dose and sample pH) affecting the adsorption behavior of the removal process were studied using the response surface methodology. Under optimized condition, equilibrium data obtained were fitted into the Langmuir and Freundlich isotherms and the data fitted well with Langmuir isotherms. Langmuir adsorption capacities (mg/g) were found to be 113, 111, 128, and 123 mg/g for Cd, Cu, Ni and Mn, respectively. In addition, the adsorption kinetics was analyzed using five kinetic models, pseudo-first order, pseudo-second order, intraparticle diffusion and Boyd models. The adsorbent was successfully applied for removal of Cd(II), Cu(II), Mn (II) and Ni(II) ions in wastewater samples.

Download Full-text

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.

Download Full-text

Study on the Oxidative Leaching of Uranium from the Lignite in the CO32-/HCO3- System

Geofluids ◽

10.1155/2017/7130971 ◽

2017 ◽

Vol 2017 ◽

pp. 1-8

Author(s):

Y. Ning ◽

Y. Li ◽

Y. Zhang ◽

P. Tang

Keyword(s):

Yunnan Province ◽

Reaction Model ◽

Second Order Reaction ◽

Liquid Ratio ◽

Uranium Leaching ◽

Pseudo Second Order ◽

Oxidative Leaching ◽

Solid Liquid ◽

Leaching Efficiency ◽

Alcoholic Hydroxyl

Na2CO3/NaHCO3 mixtures with different oxidants were used to leach uranium in the lignite which was obtained from Lincang, Yunnan province. The experimental results showed that the optimal solid/liquid ratio and CO32-/HCO3- ratio for uranium leaching were 1 : 20 (g/mL) and 2 : 1, respectively. With the increase of carbon concentration from 0.1 mol/L to 1.1 mol/L, the leaching efficiency of uranium increased from 14.64% to 42.39% after 6 h leaching. The oxidants could significantly enhance the uranium leaching efficiency, which was up to 72.23% by injecting O2 at 1.5 L/min after 12 h leaching. The oxidative leaching process of uranium from the lignite was better fitted to the pseudo-second-order reaction model. The sequential extraction results illustrated that the oxidants could effectively enhance the leaching of organic matter bound uranium in the lignite, which was decreased from 76.86 mg/kg to 9.00 mg/kg by injecting O2. The infrared spectrum analysis demonstrated that the corresponding transmittance at about 3197 cm−1 was prominently reduced after the oxidative leaching, which intimated that the phenolic and alcoholic hydroxyl might be the main functional groups combined with uranium in the lignite.

Download Full-text

Comparative Studies of the Adsorption of Direct Dye on Activated Carbon and Conducting Polymer Composite

E-Journal of Chemistry ◽

10.1155/2012/603196 ◽

2012 ◽

Vol 9 (3) ◽

pp. 1122-1134 ◽

Cited By ~ 6

Author(s):

J. Raffiea Baseri ◽

P. N. Palanisamy ◽

P. Sivakumar

Keyword(s):

Activated Carbon ◽

Polymer Composite ◽

Order Kinetic ◽

Batch Mode ◽

Adsorption Capacities ◽

Direct Blue ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Direct Dye ◽

Adsorptive Properties

This study analyses the feasibility of removing Direct Blue 71 from aqueous solution by different adsorbents such as activated carbon (TPAC) and Poly pyrrole polymer composite (PPC) prepared fromThevetia Peruviana. Batch mode adsorption was performed to investigate the adsorption capacities of these adsorbents by varying initial dye concentration, temperature, agitation time and pH. The performance of TPAC was compared with PPC. Among the adsorbents, PPC had more adsorption capacity (88.24%) than TPAC (58.82%) at an initial concentration of 50 mg/L and at 30°C. The experimental data best fitted with pseudo second order kinetic model. The adsorption data fitted well for Langmuir adsorption isotherm. Thermodynamic parameters for the adsorbents were also evaluated. The carbon embedded in conducting polymers matrix show better adsorptive properties than activated carbon.

Download Full-text

Modified Mangosteen shell carbon in the removal of Pb (II) and Hg (II) from aqueous solution-Isotherm and Kinetic studies

Global NEST Journal ◽

10.30955/gnj.003188 ◽

2021 ◽

Keyword(s):

Aqueous Solution ◽

Wastewater Treatment ◽

Adsorption Mechanism ◽

Kinetic Studies ◽

Synthetic Wastewater ◽

Batch Mode ◽

Adsorption Capacities ◽

Freundlich Adsorption Isotherm ◽

Pseudo Second Order ◽

Ft Ir

<p>An adsorbent was prepared from Mangosteen shell using sulphuric acid and sodium bicarbonate as modifiers. Bicarbonate treated mangosteen shell (BTMC) was characterized using FT- IR, SEM, EDAX and XRD data. The Freundlich adsorption isotherm model gives a good fit. The maximum adsorption capacities of BTMC were found to be 58.48 mg g-1 and 49.75 mg g-1 for Pb (II) and. Hg (II). Adsorption of Pb (II) and Hg (II) followed pseudo-second-order kinetics. The adsorption mechanism was explained using the Weber and Morris's intra-particular diffusion process. Batch mode studies with synthetic wastewater suggest that BTMC can be efficiently used in wastewater treatment.</p>

Download Full-text

Removal of Phenol ando-Cresol by Adsorption onto Activated Carbon

E-Journal of Chemistry ◽

10.1155/2008/261637 ◽

2008 ◽

Vol 5 (2) ◽

pp. 224-232 ◽

Cited By ~ 13

Author(s):

A. Edwin Vasu

Keyword(s):

Activated Carbon ◽

Kinetic Studies ◽

Batch Mode ◽

Phenol Solution ◽

Adsorption Capacities ◽

Monolayer Adsorption ◽

Adsorption Data ◽

Pseudo Second Order ◽

Dilute Aqueous Solutions ◽

Isotherm Equations

A commercial activated carbon was utilized for the adsorptive removal of phenol and o-cresol from dilute aqueous solutions. Batch mode adsorption studies were performed by varying parameters such as concentration of phenol solution, time, pH and temperature. The well known Freundlich, Langmuir and Redlich-Peterson isotherm equations were applied for the equilibrium adsorption data and the various isotherm parameters were evaluated. The Langmuir monolayer adsorption capacities were found to be 0.7877 and 0.5936 mmole/g, respectively, for phenol and o-cresol. Kinetic studies performed indicate that the sorption processes can be better represented by the pseudo-second order kinetics. The processes were found to be endothermic and the thermodynamic parameters were evaluated. Desorption studies performed indicate that the sorbed phenol molecules can be desorbed with dil. HCl.

Download Full-text

The Physiochemical Properties and Adsorption Characteristics of Processed Pomelo Peel as a Carrier for Epigallocatechin-3-Gallate

Molecules ◽

10.3390/molecules25184249 ◽

2020 ◽

Vol 25 (18) ◽

pp. 4249

Author(s):

Liangyu Wu ◽

Guoying Zhang ◽

Jinke Lin

Keyword(s):

Adsorption Capacity ◽

Batch Adsorption ◽

Maximum Adsorption Capacity ◽

Isothermal Adsorption ◽

Physiochemical Properties ◽

Pomelo Peel ◽

Adsorption Capacities ◽

Endothermic Process ◽

Pseudo Second Order ◽

Enhanced Adsorption

The NaOH-HCl- and ethanol-pretreated pomelo peel samples were prepared to apply to the batch adsorption for epigallocatechin-3-gallate (EGCG). The characteristics of peel samples were determined by Fourier transform infrared spectroscopy, scanning electron microscopy and a laser particle analyzer. The results of the physiochemical properties of the peel samples demonstrate that these peel samples have a promising adsorption capacity for EGCG, because of the increased potential binding sites on the surface compared with those of untreated peel samples. These two peel samples showed enhanced adsorption capacities of EGCG compared with that of unmodified peel in terms of the isothermal adsorption process, which could be described by both Langmuir and Freundlich models, with the theoretical maximum adsorption capacity of 77.52 and 94.34 mg g−1 for the NaOH-HCl and ethanol-treated peel samples, respectively. The adsorption kinetics demonstrated an excellent fitness to pseudo-second-order, showing that chemisorption was the rate-limiting step. The thermodynamics analysis revealed that the adsorption reaction was a spontaneous and endothermic process. This work highlights that the processed pomelo peels have outstanding adsorption capacities for EGCG, which could be promising candidates for EGCG delivering in functional food application.

Download Full-text

Sorption Behaviors of Light Lanthanides(III) (La(III), Ce(III), Pr(III), Nd(III)) and Cr(III) Using Nitrolite

Materials ◽

10.3390/ma13102256 ◽

2020 ◽

Vol 13 (10) ◽

pp. 2256 ◽

Cited By ~ 2

Author(s):

Grzegorz Wójcik

Keyword(s):

Sorption Kinetics ◽

Second Order ◽

Adsorption Capacities ◽

Initial Ph ◽

Intra Particle Diffusion ◽

Endothermic Process ◽

Pseudo Second Order ◽

Light Lanthanides ◽

Kinetics Of ◽

Better Than

The sorption of light lanthanides(III) (La(III), Ce(III), Pr(III), Nd(III)) and chromium(III) ions from acidic solutions on Nitrolite was studied at varying ions concentrations, pH, contact time and temperatures. The sorption capacity of lanthanides(III) and chromium(III) ions were examined in the ranges 2–9 and 2–5, respectively. The adsorption capacities of all metals are increase with the increasing pH (up to initial pH 9), despite the potential precipitation of metals at higher pH values. Therefore, an initial pH 9 of lanthanides gives the highest adsorption capacities. The kinetics of sorption chromium(III) and light lanthanides(III) were investigated. The experimental data were analyzed using the pseudo-first-order, pseudo-second-order forms, Elovich, and intra-particle diffusion models. The sorption kinetics of investigated ions was described by pseudo-second-order model the best. The results indicate the endothermic process of Cr(III), La(III), Ce(III), Pr(III) and Nd(III) ions sorption. The sorption capacities of La(III) 4.77 mg/g, Ce(III) 4.45 mg/g, Pr(III) 4.30 mg/g, Nd(III) 4.13 mg/g and Cr(III) 2.39 mg/g were calculated from the Langmiur model, which describes adsorption better than Freundlich and Dubinin–Radushkevich.

Download Full-text