scholarly journals Synthesis of Fe3O4/graphene oxide nanocomposite for the treatment of heavy metals in the contaminated wastewater

2015 ◽  
Vol 18 (4) ◽  
pp. 212-220
Author(s):  
Hieu Huu Nguyen ◽  
Kieu Thi Minh Dang ◽  
Diem Thi Hoai Phan
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Magnetic Behavior ◽  
Xrd Analysis ◽  
Maximum Adsorption Capacity ◽  
Bet Specific Surface Area ◽  
Langmuir Isotherm Model ◽  
Diffraction Peaks ◽  
Average Size ◽  
Modified Hummers Method

In this research, Fe3O4/graphene oxide nanocomposite was synthesized as an adsorbent for removal of Pb2+ from contaminated wastewater. According to this route, graphene oxide (GO) was synthesized from graphite via a modified Hummers method and for the preparation of Fe3O4/GO nanocomposite by impregnation. The result of XRD analysis showed that Fe3O4/GO nanocomposite has characteristic diffraction peaks corresponding to Fe3O4 and GO. Analysis of FTIR spectra indicated that the specific functional groups of Fe3O4 and GO in the nanocomposite. SEM and TEM images presented Fe3O4 nanoparticles in the average size of 10 nm are distributed on the surface of GO sheets. The BET specific surface area of the nanocomposite is about 72.9 m2/g. The TGA analysis demonstrated the thermal property of Fe3O4/GO nanocomposite. This material showed excellent magnetic behavior and therefore after adsorbing it can be recovered by applying an external magnetic field. The adsorption capacity of this nanocomposite was investigated and the concentration of residual Pb2+ ions in the solution was measured using ICP-OES. Equilibrium adsorption data were fitted by Langmuir isotherm model and the predicted maximum adsorption capacity was 54.64 mg/g.

scholarly journals Fabrication, characterization, and adsorption capacity of Fe3O4/graphene oxide nanocomposites for nickel removal

2016 ◽  
Vol 19 (3) ◽  
pp. 60-68
Author(s):  
Hieu Huu Nguyen ◽  
Nam Minh Hoang ◽  
Diem Thi Hoai Phan
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Ph Effect ◽  
Maximum Adsorption Capacity ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Langmuir Isotherm Model ◽  
Modified Hummers Method

In this research, graphene oxide (GO) was synthesized via modified Hummers’ method and for the preparation of Fe3O4/GO nanocomposites by impregnation method. Characterization of the nanocomposites was performed by X–ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscope, specific surface area, and vibrating sample magnetometer. The concentration of Ni (II) ion in solutions was determined using UV-Visible spectrophoto-meter. The adsorption capacity for Ni (II) removal was examined with respect to pH effect, kinetic data and equilibrium isotherms in batch experiments. The maximum adsorption capacity of the Fe3O4/GO estimated with the Langmuir-isotherm model for Ni (II) was 27.62 mg/g at room temperature.

Adsorption kinetics and thermodynamics of acid Bordeaux B from aqueous solution by graphene oxide/PAMAMs

2015 ◽  
Vol 72 (7) ◽  
pp. 1217-1225 ◽  
Author(s):  
Fan Zhang ◽  
Shengfu He ◽  
Chen Zhang ◽  
Zhiyuan Peng
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Maximum Adsorption Capacity ◽  
Freundlich Model ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Effects Of Media ◽  
Better Than

Graphene oxide/polyamidoamines dendrimers (GO/PAMAMs) composites were synthesized via modifying GO with 2.0 G PAMAM. The adsorption behavior of the GO/PAMAMs for acid Bordeaux B (ABB) was studied and the effects of media pH, adsorption time and initial ABB concentration on adsorption capacity of the adsorbent were investigated. The optimum pH value of the adsorption of ABB onto GO/PAMAMs was 2.5. The maximum adsorption capacity increased from 325.78 to 520.83 mg/g with the increase in temperature from 298 to 328 K. The equilibrium data followed the Langmuir isotherm model better than the Freundlich model. The kinetic study illustrated that the adsorption of ABB onto GO/PAMAMs fit the pseudo-second-order model. The thermodynamic parameters indicated that the adsorption process was physisorption, and also an endothermic and spontaneous process.

scholarly journals Fabrication of Carboxymethylcellulose/Metal-Organic Framework Beads for Removal of Pb(II) from Aqueous Solution

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 942 ◽  
Author(s):  
Huo-Xi Jin ◽  
Hong Xu ◽  
Nan Wang ◽  
Li-Ye Yang ◽  
Yang-Guang Wang ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Photoelectron Spectroscopy ◽  
Langmuir Isotherm ◽  
Adsorption Equilibrium ◽  
Isotherm Model ◽  
Maximum Adsorption Capacity ◽  
X Ray ◽  
Metal Organic ◽  
Langmuir Isotherm Model

The ability to remove toxic heavy metals, such as Pb(II), from the environment is an important objective from both human-health and ecological perspectives. Herein, we describe the fabrication of a novel carboxymethylcellulose-coated metal organic material (MOF-5–CMC) adsorbent that removed lead ions from aqueous solutions. The adsorption material was characterized by Fourier-transform infrared spectroscopy, X-ray diffractometry, scanning electron microscopy, and X-ray photoelectron spectroscopy. We studied the functions of the contact time, pH, the original concentration of the Pb(II) solution, and adsorption temperature on adsorption capacity. MOF-5–CMC beads exhibit good adsorption performance; the maximum adsorption capacity obtained from the Langmuir isotherm-model is 322.58 mg/g, and the adsorption equilibrium was reached in 120 min at a concentration of 300 mg/L. The adsorption kinetics is well described by pseudo-second-order kinetics, and the adsorption equilibrium data are well fitted to the Langmuir isotherm model (R2 = 0.988). Thermodynamics experiments indicate that the adsorption process is both spontaneous and endothermic. In addition, the adsorbent is reusable. We conclude that MOF-5–CMC is a good adsorbent that can be used to remove Pb(II) from aqueous solutions.

Preparation of Graphene Oxide Modified Rice Husk for Cr(VI) Removal

2019 ◽  
Vol 19 (11) ◽  
pp. 7035-7043 ◽  
Author(s):  
Tong Ouyang ◽  
Jidan Tang ◽  
Fang Liu ◽  
Chang-Tang Chang
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Rice Husk ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Adsorption Sites ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Alkaline Conditions ◽  
Rice Husk Biochar

The objective of this paper is to study the removal of Cr(VI) in aqueous solution by using a new graphene oxide-coated rice husk biochar composite (GO-RHB). GO-RHB is a synthetic material having a porous structure with lots of oxygen-containing functional groups and a large surface area that provide effective adsorption sites. Experiments showed that GO-RHB had higher adsorption capacity under acidic than under alkaline conditions. At pH of 2, GO-RHB has the maximum adsorption capacity(48.8 mg g−1). Equilibrium data obtained by fitting with the Langmuir and Freundlich models indicate that the reaction process was monolayer adsorption. The adsorption of Cr(VI) followed the pseudo-second-order kinetic model that illustrates chemical adsorption. Intraparticlediffusion studies further revealed that film diffusion was taking place. Moreover, the results of thermodynamics showed that the adsorption process was endothermic and spontaneous in nature. The removal mechanism of Cr(VI) was also explained in detail. The prepared adsorbent is highly efficient and might be useful than many other conventional adsorbent used for the removal of Cr(VI) from wastewater.

scholarly journals Electrochemical Evaluation of Selenium (IV) Removal from Its Aqueous Solutions by Unmodified and Modified Graphene Oxide

Molecules ◽  
2019 ◽  
Vol 24 (6) ◽  
pp. 1063
Author(s):  
Zuzana Koudelkova ◽  
Zuzana Bytesnikova ◽  
Kledi Xhaxhiu ◽  
Monika Kremplova ◽  
David Hynek ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Iron Oxide ◽  
Adsorption Capacity ◽  
Selenium Concentration ◽  
Stripping Voltammetry ◽  
World Health ◽  
Maximum Adsorption Capacity ◽  
Adsorption Model ◽  
Graphene Oxides ◽  
Modified Graphene Oxide

The removal of selenium from superficial and waste water is a worldwide problem. The maximum limit according to the World Health Organization (WHO) for the selenium in the water is set at a concentration of 10 μg/L. Carbon based adsorbents have attracted much attention and recently demonstrated promising performance in removal of selenium. In this work, several materials (iron oxide based microparticles and graphene oxides materials) and their composites were prepared to remove Se(IV) from water. The graphene oxides were prepared according to the simplified Hummer’s method. In addition, the effect of pH, contact time and initial Se(IV) concentration was tested. An electrochemical method such as the differential pulse cathodic stripping voltammetry was used to determine the residual selenium concentration. From the experimental data, Langmuir adsorption model was used to calculate the maximum adsorption capacity. Graphene oxide particles modified by iron oxide based microparticles was the most promising material for the removal of Se(IV) from its aqueous solution at pH 2.0. Its adsorption efficiency reached more than 90% for a solution with given Se(IV) concentration, meanwhile its maximal recorded adsorption capacity was 18.69 mg/g.

scholarly journals Selenate Adsorption from Water Using the Hydrous Iron Oxide-Impregnated Hybrid Polymer

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1630
Author(s):  
Vesna Marjanovic ◽  
Aleksandra Peric-Grujic ◽  
Mirjana Ristic ◽  
Aleksandar Marinkovic ◽  
Radmila Markovic ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Xrd Analysis ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Adsorbent Regeneration ◽  
Desorption Efficiency ◽  
Hydrous Iron Oxide ◽  
The Cross

Hybrid adsorbent, based on the cross-linked copolymer impregnated with hydrous iron oxide, was applied for the first time for Se(VI) adsorption from water. The influence of the initial solution pH, selenate concentration and contact time to adsorption capacity was investigated. Adsorbent regeneration was explored using a full factorial experimental design in order to optimize the volume, initial pH value and concentration of the applied NaCl solution as a reagent. Equilibrium state was described using the Langmuir model, while kinetics fitted the pseudo-first order. The maximum adsorption capacity was found to be 28.8 mg/g. Desorption efficiency increased up to 70%, and became statistically significant with the reagent concentration and pH increase, while the applied solution volume was found to be insignificant in the investigated range. Based on the results obtained, pH influence to the adsorption capacity, desorption efficiency, Fourier transform infrared (FTIR) and X-ray diffraction (XRD) analysis of loaded adsorbent, it was concluded that the outer- and inner-sphere complexation are mechanisms responsible for Se(VI) separation from water. In addition to the experiments with synthetic solutions, the adsorbent performances in drinking water samples were explored, showing the purification efficiency up to 25%, depending on the initial Se(VI) concentration and water pH. Determined sorption capacity of the cross-linked copolymer impregnated with hydrous iron oxide and its ability for regeneration, candidate this material for further research, as a promising anionic species sorbent.

scholarly journals Mechanosynthesis of MFe2O4 (M = Co, Ni, and Zn) Magnetic Nanoparticles for Pb Removal from Aqueous Solution

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
America R. Vazquez-Olmos ◽  
Mohamed Abatal ◽  
Roberto Y. Sato-Berru ◽  
G. K. Pedraza-Basulto ◽  
Valentin Garcia-Vazquez ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Xrd Analysis ◽  
Maximum Adsorption Capacity ◽  
Sorption Behavior ◽  
Order Kinetic ◽  
X Ray ◽  
Isotherm Adsorption ◽  
Crystallite Sizes ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

Adsorption of Pb(II) from aqueous solution using MFe2O4 nanoferrites (M = Co, Ni, and Zn) was studied. Nanoferrite samples were prepared via the mechanochemical method and were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), micro-Raman, and vibrating sample magnetometry (VSM). XRD analysis confirms the formation of pure single phases of cubic ferrites with average crystallite sizes of 23.8, 19.4, and 19.2 nm for CoFe2O4, NiFe2O4, and ZnFe2O4, respectively. Only NiFe2O4 and ZnFe2O4 samples show superparamagnetic behavior at room temperature, whereas CoFe2O4 is ferromagnetic. Kinetics and isotherm adsorption studies for adsorption of Pb(II) were carried out. A pseudo-second-order kinetic describes the sorption behavior. The experimental data of the isotherms were well fitted to the Langmuir isotherm model. The maximum adsorption capacity of Pb(II) on the nanoferrites was found to be 20.58, 17.76, and 9.34 mg·g−1 for M = Co, Ni, and Zn, respectively.

Adsorption of Crystal Violet oNto Nitrogen-Doped Mesoporous Carbon

2017 ◽  
Vol 42 (3) ◽  
pp. 269-281
Author(s):  
Lvling Zhong ◽  
Liang Zhang ◽  
Hongliang Shi
Keyword(s):  
Adsorption Capacity ◽  
Crystal Violet ◽  
Photoelectron Spectroscopy ◽  
Control Process ◽  
Maximum Adsorption Capacity ◽  
Nitrogen Doped ◽  
First Order Kinetics ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Adsorption Desorption

A series of nitrogen-doped mesoporous carbons (NDMCs) was prepared using p-phenylenediamine and glyoxal as a carbon source and mesoporous silica as a hard template. N2 adsorption–desorption isotherms indicated that mesopores with a wider distribution exist in NDMCs. Elemental analysis showed that the N content on the surface of NDMC-800 was 9.9at.%, with a result close to 8.4at.% from X-ray photoelectron spectroscopy. The adsorption capacity of NDMCs for crystal violet (CV) in aqueous solution was investigated. Static equilibrium data were well described by the Langmuir isotherm model, with a maximum adsorption capacity of 243.9 mg g−1. Adsorption kinetics data suggested that the adsorption control process follows the pseudo first-order kinetics model. The results showed that this carbon material has the potential for application in adsorption of CV.

scholarly journals Graphene Oxide Adsorption Enhanced by Attapulgite to Remove Pb (II) from Aqueous Solution

2019 ◽  
Vol 9 (7) ◽  
pp. 1390 ◽  
Author(s):  
Bigui Wei ◽  
Xiabing Cheng ◽  
Gang Wang ◽  
Hua Li ◽  
Xiaosan Song ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
High Efficiency ◽  
Separation Efficiency ◽  
Hydrothermal Reaction ◽  
Adsorption Properties ◽  
Maximum Adsorption Capacity

To improve the adsorption and separation efficiency of lead-containing wastewater by graphene oxide (GO), attapulgite (ATP) was used through a simple hydrothermal reaction. The prepared GO was characterized by SEM, TEM, FTIR, and XPS. The adsorption properties of the prepared GO were investigated. The maximum adsorption capacity of Pb2+ on as-prepared GO at pH 5 and 25 °C was 450.9 mg/g. It is concluded that the as-prepared GO can be used as a high-efficiency adsorbent for lead-containing wastewater.

Carboxylated carbon nanotubes-graphene oxide aerogels as ultralight and renewable high performance adsorbents for efficient adsorption of glyphosate

2020 ◽  
Vol 17 (1) ◽  
pp. 6 ◽  
Author(s):  
Hao Liu ◽  
Xueying Wang ◽  
Chaofan Ding ◽  
Yuxue Dai ◽  
Yuanling Sun ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Langmuir Isotherm ◽  
Adsorption Process ◽  
Organophosphorus Pesticide ◽  
Isotherm Model ◽  
Langmuir Isotherm Model ◽  
Graphene Oxide Aerogel ◽  
Carboxylated Carbon Nanotubes

Environmental contextGlyphosate is a highly effective and widely used organophosphorus pesticide, but its residues can harm the environment and human health. We report a carboxylated carbon nanotubes-graphene oxide aerogel that can efficiently remove glyphosate from water. This technology has great application prospects in dealing with water contaminated with glyphosate. AbstractGlyphosate, an organophosphorus pesticide, has received considerable attention in recent years owing to its carcinogenic potency. The technologies that remove glyphosate in the environment, especially in water, are important. In this work, we prepare a carboxylated carbon nanotubes-graphene oxide aerogel (cCNTs-GA) by the freeze-drying method for the adsorption of glyphosate. The prepared aerogel exhibits an ultra-low density (7.30mgcm−3), good morphology and strong mechanical strength. Meanwhile, a NaOH solution (0.5molL−1) is selected as an eluent and the adsorption parameters for the adsorption of glyphosate are optimised. The properties of the adsorbents after multiple repetitions and the adsorption mechanism of the cCNTs-GA are also studied. The results show that the adsorbent can be recycled more than 20 times and maintains a good adsorption performance. The maximum adsorption capacity of glyphosate at pH 3 is calculated from the Langmuir isotherm model (546mgg−1 at the temperature of 298K), and the cCNTs-GA exhibits a high adsorption affinity and adsorption capacity for glyphosate, as determined by the partition coefficient (PC). The pseudo-second-order kinetic model fits well to the dynamic behaviour. The equilibrium adsorption process follows the Langmuir isotherm model and the adsorption process is mainly controlled by the intraparticle diffusion model. Furthermore, thermodynamic analysis indicates that the adsorption of glyphosate on the cCNTs-GA is exothermic and spontaneous. The adsorbent is used to remove glyphosate from waste water and the adsorption capacity of the cCNTs-GA for glyphosate is higher than other adsorbents, which indicates that the developed adsorbent has a great potential application in environmental pollution treatment.

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