Removal of Pb(II) from aqueous solutions by graphene oxide aerogels

2016 ◽  
Vol 74 (1) ◽  
pp. 256-265 ◽  
Author(s):  
N. S. Tabrizi ◽  
S. Zamani
Keyword(s):  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Adsorption Process ◽  
Diffusion Mechanism ◽  
Colloidal Suspensions ◽  
Influential Factors ◽  
High Porosity ◽  
Solution Ph ◽  
Equilibrium Data ◽  
Almost All

This paper reports the application of graphene oxide aerogels (GOAs) for adsorption of lead(II) ions from aqueous solutions. The aerogels were fabricated from graphene oxide (GO) colloidal suspensions by unidirectional freeze drying method. The synthesized GO powders, as well as the aerogels, were thoroughly characterized by various techniques. The experimental data showed that the kinetic of adsorption followed a pseudo-second-order model with sharp lead(II) ions uptake within the first 90 min. Kinetic data analysis revealed that the adsorption process was controlled by film diffusion mechanism. The equilibrium data were best fitted to Langmuir model and the qmax was calculated to be as high as 158 mg/g. Thermodynamic analysis demonstrated that the adsorption process was spontaneous and endothermic with increased randomness at the solid–liquid interface. Experiments showed that almost all the adsorbed ions could desorb into the solution only by decreasing the solution pH below the isoelectric point of the adsorbent. In addition to abundant oxygen containing functional groups existing on the surface of GO sheets, high porosity and surface area of the aerogel are believed to be influential factors in the adsorption process.

scholarly journals Biosorption of Zinc on Immobilized Green Algae: Equilibrium and Dynamics Studies

2008 ◽  
Vol 5 (1) ◽  
pp. 20 ◽  
Author(s):  
D. Sheikha ◽  
I. Ashour ◽  
F.A. Abu Al-Rub
Keyword(s):  
Aqueous Solutions ◽  
Diffusion Mechanism ◽  
Sorption Process ◽  
Zinc Ion ◽  
Alginate Beads ◽  
Zinc Uptake ◽  
Zinc Ions ◽  
Solution Ph ◽  
Equilibrium Data ◽  
Isotherm Equations

The efficacy of using blank alginate beads and immobilized dead algal cells for the removal of zinc ions from aqueous solutions was investigated. It was found that the sorption capacities were significantly affected by solution pH; with higher pH favoring higher zinc ion uptake. Dynamics and isotherm experiments were carried out at the optimal pH 5.0. Zinc uptake on either sorbent was found to be rapid where approximately 90% of the maximum zinc uptake occurred within the first 30 min in both cases of blank alginate and immobilized algal cells. The equilibrium data for the biosorption of zinc ions onto both sorbents were fitted to the Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm equations. The presence of copper and nickel in aqueous solutions was found to suppress the sorption process. The results of the dynamics studies revealed that the biosorption of zinc on immobilized dead algal cells followed pseudo-second order kinetics with little intraparticle diffusion mechanism contribution. 

scholarly journals Study on Adsorption of Cu and Ba from Aqueous Solutions Using Nanoparticles of Origanum (OR) and Lavandula (LV)

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Ghadah M. Al-Senani ◽  
Foziah F. Al-Fawzan
Keyword(s):  
Heavy Metals ◽  
Particle Size ◽  
Free Energy ◽  
Aqueous Solutions ◽  
Thermodynamic Parameters ◽  
Solution Ph ◽  
Environment Friendly ◽  
Removal Of Heavy Metals ◽  
Equilibrium Data ◽  
Langmuir And Freundlich Models

Wild herbs (Origanum (OR) and Lavandula (LV)) were used as environment-friendly adsorbents in this study. The adsorbents were used for adsorption of Cu and Ba from water. The adsorption of heavy metals onto OR and LV was dependent on particle size, dose, and solution pH. The diameter of adsorbent particles was less than 282.8 nm. The adsorption follows second-order kinetics. Langmuir and Freundlich models have been applied to describe the equilibrium data, and the thermodynamic parameters, the Gibbs free energy, ∆G°, enthalpy, ∆H°, and entropy, ∆S°, have been determined. The positive value of ∆H° suggests that the adsorption of heavy metals by the wild herbs is endothermic. The negative values of ∆G° at all the studied temperatures indicate that the adsorption is a spontaneous process. It can be concluded that OR and LV are promising adsorbents for the removal of heavy metals from aqueous solutions over a range of concentrations.

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

2015 ◽  
Vol 71 (11) ◽  
pp. 1611-1619 ◽  
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.

scholarly journals Removal of phenol from aqueous solution by adsorption onto seashells: equilibrium, kinetic and thermodynamic studies

2013 ◽  
Vol 3 (2) ◽  
pp. 119-127 ◽  
Author(s):  
Papita Das Saha ◽  
Jaya Srivastava ◽  
Shamik Chowdhury
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Phenol Concentration ◽  
Phenol Removal ◽  
Solution Ph ◽  
Initial Ph ◽  
Equilibrium Data ◽  
Initial Phenol Concentration ◽  
Adsorption Equilibrium Data ◽  
Adsorbent Dose

The efficacy of seashells as a new adsorbent for removal of phenol from aqueous solutions was studied by performing batch equilibrium tests under different operating parameters such as solution pH, adsorbent dose, initial phenol concentration, and temperature. The phenol removal efficiency remained unaffected when the initial pH of the phenol solution was in the range of 3–8. The amount of phenol adsorbed increased with increasing initial phenol concentration while it decreased with increasing temperature. The adsorption equilibrium data showed excellent fit to the Langmuir isotherm model with maximum monolayer adsorption capacity of 175.27 mg g−1 at pH 4.0, initial phenol concentration = 50 mg L−1, adsorbent dose = 2 g and temperature = 293 K. Analysis of kinetic data showed that the adsorption process followed pseudo-second-order kinetics. Activation energy of the adsorption process, calculated using the Arrhenius equation, was found to be 51.38 kJ mol−1, suggesting that adsorption of phenol onto seashells involved chemical ion-exchange. The numerical value of the thermodynamic parameters (ΔG0, ΔH0 and ΔS0) indicated that adsorption of phenol onto seashells was feasible, spontaneous and endothermic under the examined conditions. The study shows that seashells can be used as an economic adsorbent for removal of phenol from aqueous solution.

Reusable colloidal graphene oxide suspensions combined with dialysis bags for recovery of trace Y(iii) from aqueous solutions

RSC Advances ◽  
2014 ◽  
Vol 4 (102) ◽  
pp. 58778-58787 ◽  
Author(s):  
Weifan Chen ◽  
Linlin Wang ◽  
Mingpeng Zhuo ◽  
Yiping Wang ◽  
Sulei Fu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Colloidal Suspensions ◽  
Schematic Diagram ◽  
Graphene Oxide Nanosheets ◽  
Adsorption And Desorption ◽  
Dialysis Bag

Schematic diagram of Y(iii) adsorption and desorption on graphene oxide nanosheets in colloidal suspensions loaded in a dialysis bag.

scholarly journals Removal of anthracene from aqueous solutions using modified magnetic Fe3O4 nanoparticles by dendrimer polymer chains and 4-aminophenol Ligandide

2020 ◽  
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Process ◽  
Polymer Chains ◽  
Isotherm Models ◽  
Operational Parameters ◽  
X Ray Diffraction ◽  
Residual Concentration ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
The Fourier Transform

Background: Anthracene is an organic compound and environmentally resistant pollutant that causes severe damage to human health due to toxic and carcinogenic properties. The present study aimed to investigate the efficiency of magnetic dendrimer nano-adsorbent for the removal of anthracene from aqueous solutions. Methods: In this study, the synthesized iron oxide nanoparticles were modified by dendrimer polymer chains and 4-aminophenol ligand. The Fourier-transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy were conducted to examine the nano-absorbent properties. Different operational parameters in the adsorption process in batch and laboratory conditions were also studied, and the adsorbent reusability was correspondingly examined in this study. The residual concentration of anthracene in aqueous solution was determined and reported by a spectrophotometer. Findings: Optimization results showed that the maximum adsorbent capacity under optimum conditions (pH=7, 20 mg/L anthracene concentration, 0.5 g/L adsorbent dosage, and 30 min contact time) was equal to 83 mg/g. The experimental data fitted with different isotherm models showed that the equilibrium data were well described by the Langmuir model. In this study, the adsorption process overlapped more with the pseudo-second-order kinetics model. Conclusion: The obtained results indicated that the synthesized nanostructured adsorbent has a high adsorption capacity with high recovery and is efficient enough to remove anthracene from aqueous solutions.

scholarly journals (3-Aminopropyl) Triethoxysilane (APTES) Functionalized Magnetic Nanosilica Graphene Oxide (MGO) Nanocomposite for the Comparative Adsorption of the Heavy Metal (Pb(II), Cd(II) and Ni(II)) ions from Aqueous Solution

2021 ◽  
Author(s):  
C Donga ◽  
S Mishra ◽  
A Aziz ◽  
L Ndlovu ◽  
A Kuvarega ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Metal Ion ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
Solution Ph ◽  
Magnetic Graphene Oxide ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Adsorption Equilibrium Data

Abstract (3-aminopropyl) triethoxysilane (APTES) modified magnetic graphene oxide was synthesized and applied in the adsorption of three heavy metals, Pb(II), Cd(II) and Ni(II) from aqueous solution. An approach to prepare magnetic GO was adopted by using (3-aminopropyl) triethoxysilane (APTES) as a functionalizing agent on magnetic nanosilica coupled with GO to form the Fe3O4@SiO2-NH2/GO nanocomposite. FT-IR, XRD, BET, UV, VSM, SAXS, SEM and TEM were used to characterize the synthesized nanoadsorbents. Batch adsorption studies were conducted to investigate the effect of solution pH, initial metal ion concentration, adsorbent dosage and contact time. The maximum equilibrium time was found to be 30 min for Pb(II), Cd(II) and 60 min for Ni(II). The kinetics studies showed that the adsorption of Pb(II), Cd(II) and Ni(II) onto Fe3O4@SiO2-NH2/GO followed the pseudo-second-order kinetics. All the adsorption equilibrium data were well fitted to Langmuir isotherm model and maximum monolayer adsorption capacity for Pb(II), Cd(II) and Ni(II) were 13.46, 18.58 and 13.52 mgg-1, respectively. The Fe3O4@SiO2-NH2/GO adsorbents were reused for at least 7 cycles without the leaching of mineral core, showing the enhanced stability and potential application of Fe3O4@SiO2-NH2/GO adsorbents in water/wastewater treatment.

scholarly journals Treatment of effluent from fertilizer industry by adsorption on willow sawdust-removal of Ni(II) and Cd(II) from the effluent

2021 ◽  
pp. 1-12
Author(s):  
Raafia Najam ◽  
Syed Muzaffar Ali Andrabi
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Low Cost ◽  
Second Order ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
The World ◽  
Pseudo Second Order ◽  
Almost All ◽  
Willow Tree

Sawdust of willow has been investigated as an adsorbent for the removal of Ni(II), and Cd(II) ions from aqueous solution. Since willow tree is widely grown in almost all parts of Kashmir, it can be a common most easily available, sustainable, low cost adsorbent for the treatment of wastewaters in this part of the world where growing industrialization is affecting water quality like elsewhere in the world. Therefore, it is worthwhile to investigate the potential of sawdust of willow tree as an adsorbent for the removal of Ni(II) and Cd(II) ions from aqueous solution as a first step. Batch experiments were conducted to study the effect of some parameters such as contact time, initial concentration of metal ions, solution pH and temperature. Langmuir and Freundlich models were employed for the mechanistic analysis of experimental data obtained. Results reveal that in our system adsorption follows the Langmuir isotherm. The maximum adsorption capacity of Ni(II) and Cd(II) were found to be 7.98 and 7.11 mg/g respectively at optimum conditions. The pseudo-first-order and pseudo-second-order models were employed for kinetic analysis of adsorption process. The adsorption process follows pseudo-second-order kinetics. The efficacy of the adsorbent in the treatment of effluent from fertilizer factory has been investigated and the results have been found encouraging.

scholarly journals SYNTHESIS AND APPLICATION OF CHITOSAN/GRAPHENE OXIDE/MAGNETITE NANOSTRUCTURED COMPOSITE FOR Fe(III) REMOVAL FROM AQUEOUS SOLUTION

2018 ◽  
Vol 56 (2) ◽  
pp. 158
Author(s):  
Truong Dang Le ◽  
Hoang Vinh Tran ◽  
Le Dieu Thu ◽  
Tran Ngoc Quang ◽  
Nguyen Thi Minh Hang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Adsorption Equilibrium ◽  
Efficient Removal ◽  
Nanostructured Composite ◽  
Equilibrium Data ◽  
Adsorption Equilibrium Data ◽  
Efficient Adsorbent

In this research, the potential of chitosan/Fe3O4/graphene oxide (CS/Fe3O4/GO) nanocomposite for efficient removal of Fe(III) a cationic metal ion from aqueous solutions was investigated. The synthesized CS/Fe3O4/GO was characterized by XRD, VSM and SEM techniques. Also, the various parameters affecting Fe3+ removal were investigated. Fe(III) adsorption equilibrium data were fitted well to the Langmuir isotherm and the maximum monolayer capacity (qmax), was calculated from the Langmuir as 6.5 mg.g-1. The results show that, CS/Fe3O4/GO nanocomposite, can be used as a cheap and efficient adsorbent for removal of heavy metal ions from aqueous solutions.

scholarly journals The Adsorption of Methylene Blue by an Amphiphilic Block Co-Poly(Arylene Ether Nitrile) Microsphere-Based Adsorbent: Kinetic, Isotherm, Thermodynamic and Mechanistic Studies

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1356 ◽  
Author(s):  
Xuefei Zhou ◽  
Mingzhen Xu ◽  
Lingling Wang ◽  
Xiaobo Liu
Keyword(s):  
Methylene Blue ◽  
Adsorption Process ◽  
Selective Adsorption ◽  
Modern Society ◽  
Influential Factors ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Cationic Dye ◽  
Solution Ph ◽  
Arylene Ether

Dye pollution is a serious problem in modern society. We desired to develop an efficient adsorbent for the decontamination of discharged dyes. In this work, the polymeric microspheres derived from a kind of amphiphilic block of co-poly(arylene ether nitrile) (B-b-S-P) were prepared on the basis of “oil-in-water” (O/W) microemulsion method. The B-b-S-P microspheres were found competent to remove the cationic dye, methylene blue (MB); and various influential factors, such as contact time, initial concentration, solution pH and temperature were investigated. Results indicated that the maximum adsorption capacity of B-b-S-P microspheres for MB was 119.84 mg/g at 25 °C in neutral conditions. Adsorption kinetics and isotherm dates were well fitted to a pseudo-second-order kinetic model and the Langmuir isotherm model, and thermodynamic parameters implied that the adsorption process was endothermic. The B-b-S-P microspheres also exhibited a highly selective adsorption for cationic dye MB, even in the presence of anionic dye methyl orange (MO). In addition, the possible adsorption mechanism was studied, suggesting that the electrostatic interaction and π–π interaction could be the main force in the adsorption process.

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