Flower-Like α-Fe2O3 for Removal of Heavy Metals from Wastewater

2020 ◽  
Vol 20 (11) ◽  
pp. 6753-6759
Author(s):  
Bulgan Tsedenbal ◽  
Ji Eun Lee ◽  
Min Soo Kim ◽  
Seok Hwan Huh ◽  
Bon Heun Koo
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
High Efficiency ◽  
Adsorption Equilibrium ◽  
Freundlich Isotherm ◽  
Average Particle ◽  
Equilibrium Study ◽  
Removal Of Heavy Metals ◽  
Equilibrium Data

In the present work flower-like, α-Fe2O3 were synthesized by ethylene-glycol mediated polyol method. The synthesized flower-like, α-Fe2O3 were separated cadmium (Cd2+) chromium (Cr6+) and lead ions (Pb2+) from wastewater. XRD pattern and FESEM images show the obtained sample is pure hematite and flower-like nanostructures average particle sizes 4.0 μm. The BET specific surface area was 47.55 m2g−1. Adsorption experiments were investigated the adsorbent dose, influence pH of the metal ions, sorption times and initial concentrations of heavy metal ions. High efficiency of Cd2+, Cr6+ and Pb2+ removal occurred at pH 7.0, 3.0 and 5.5, respectively. The adsorption equilibrium study showed that the heavy metal ions adsorption of flowers like α-Fe2O3 followed a Langmuir and Freundlich isotherm model. The heavy metal ions adsorption equilibrium data were followed to the Langmuir model. The maximum adsorption capacities were 16.95, 22.22 and 25.64 mg g−1 for Cd2+, Cr6+ and Pb2+ ions respectively. This work determines that the synthesized flower-like α-Fe2O3 is proposed as an efficient nano-adsorbent for wastewater treatment.

Removal of Lead Contaminants with γ-Fe2O3 Nanocrystals

2020 ◽  
Vol 12 (3) ◽  
pp. 422-426 ◽  
Author(s):  
Bulgan Tsedenbal ◽  
Imad Hussain ◽  
Ji Eun Lee ◽  
Bon Heun Koo
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Adsorption Equilibrium ◽  
Average Particle Size ◽  
Freundlich Isotherm ◽  
Precipitation Method ◽  
Maximum Adsorption Capacity ◽  
Average Particle ◽  
Nano Adsorbent

γ-Fe2O3 (maghemite) nanocrystals were synthesized by co-precipitation method at room temperature have been used to remove Pb+2 from aqueous solutions. The prepared of this sample was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and vibrating sample magnetometer (VSM). XRD patterns indicated the maghemite structure of average particle size of ∼12 nm, which was further confirmed by the FESEM images of the γ-Fe2O3 nanosrystals. Magnetic saturation of synthesized maghemite was found to be 68.4 emu g–1. Adsorption experiments were tested for pH of the solutions, contact time and initial concentration of metal ions. The kinetic data of adsorption of heavy metal ions on the surface of the synthesized nano-adsorbent was described by a pseudo-second order equation. The adsorption equilibrium study exhibited that the heavy metal ions adsorption of maghemite nanocrystals followed a Langmuir and Freundlich isotherm model. Pb2+ adsorption equilibrium data were best fitted to Langmuir equation and maximum adsorption capacity of 25 mg g–1 was obtained. This work demonstrates that the synthesized γ-Fe2O3 nanocrystals can be considered as prospective nano-adsorbent.

In situ growth of monodispersed Fe3O4 nanoparticles on graphene for the removal of heavy metals and aromatic compounds

2013 ◽  
Vol 68 (11) ◽  
pp. 2351-2358 ◽  
Author(s):  
Hai-Xia Wu ◽  
Jia-Wei Wu ◽  
Zhi-Gang Niu ◽  
Xiu-Li Shang ◽  
Jun Jin
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Aromatic Compounds ◽  
Heavy Metal Ions ◽  
High Efficiency ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Removal Of Heavy Metals

We report on the efficient removal of heavy metal ions and aromatic compounds from simulated wastewater with a nanocomposite. The nanocomposite was obtained via thermal decomposition of the precursor Fe(acac)3 onto the surface of graphene, modified by diethylenetriamine pentaacetic anhydride through dopamine. It was found that the maximum adsorption capacity of the nanocomposite toward Cu2+ and naphthalene was 207.9 and 72.2 mg g−1 respectively, displaying a high efficiency for the removal of heavy metal ions as well as aromatic compounds at pH 7.0 and 293 K. The Langmuir for naphthalene and the Freundlich for the Cu2+ adsorption isotherms were applicable for describing the removal processes. Furthermore, the nanocomposite was carefully examined by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, Raman spectra, and UV-vis spectroscopy. This work provides a very efficient, fast and convenient approach to exploring a promising nanocomposite for water treatment.

scholarly journals A systematic study for removal of heavy metals from aqueous media using Sorghum bicolor: an efficient biosorbent

2018 ◽  
Vol 77 (10) ◽  
pp. 2355-2368 ◽  
Author(s):  
Khalida Naseem ◽  
Zahoor H. Farooqi ◽  
Muhammad Z. Ur Rehman ◽  
Muhammad A. Ur Rehman ◽  
Robina Begum ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Aqueous Media ◽  
Review Article ◽  
Isotherm Models ◽  
Adsorption Efficiency ◽  
Adsorption Isotherm Models ◽  
Removal Of Heavy Metals

Abstract This review is based on the adsorption characteristics of sorghum (Sorghum bicolor) for removal of heavy metals from aqueous media. Different parameters like pH, temperature of the medium, sorghum concentration, sorghum particle size, contact time, stirring speed and heavy metal concentration control the adsorption efficiency of sorghum biomass for heavy metal ions. Sorghum biomass showed maximum efficiency for removal of heavy metal ions in the pH range of 5 to 6. It is an agricultural waste and is regarded as the cheapest biosorbent, having high adsorption capacity for heavy metals as compared to other reported adsorbents, for the treatment of heavy metal polluted wastewater. Adsorption of heavy metal ions onto sorghum biomass follows pseudo second order kinetics. Best fitted adsorption isotherm models for removal of heavy metal ions on sorghum biomass are Langmuir and Freundlich adsorption isotherm models. Thermodynamic aspects of heavy metal ions adsorption onto sorghum biomass have also been elaborated in this review article. How adsorption efficiency of sorghum biomass can be improved by different physical and chemical treatments in future has also been elaborated. This review article will be highly useful for researchers working in the field of water treatment via biosorption processing. The quantitative demonstrated efficiency of sorghum biomass for various heavy metal ions has also been highlighted in different sections of this review article.

Imprinted polymers for the removal of heavy metal ions from water

2011 ◽  
Vol 64 (6) ◽  
pp. 1325-1332 ◽  
Author(s):  
Syed Ashraf ◽  
Angela Cluley ◽  
Ckarlos Mercado ◽  
Anja Mueller
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
High Capacity ◽  
Random Copolymer ◽  
Complete Removal ◽  
Ion Exchange Resins ◽  
Effective Removal ◽  
Removal Of Heavy Metals ◽  
Exchange Resins

In wastewater treatment, the removal of heavy metals is difficult due to the limited affinity of heavy metal ions to ion exchange resins. Here imprinting polymerization is used to develop resins with high capacity and selectivity for heavy metal ions for water treatment. A random copolymer of methacrylate and methacrylamide was found to be most effective for the removal of hydrophilic metal complexes, like CdCl2, ZnCl2, and the metalloid NaH2AsO4, particularly when the porosity of these resins is increased. For hydrophobic complexes imprinting emulsion polymerization was developed and data for the effective removal of mercury dithizonate will be described. Complete removal for up to 80 ppm of cadmium and mercury with only 200 mg of imprinted resin was obtained; competition and co-imprinting experiments are described as well.

scholarly journals 1,2,3,4-Tetrahydropyrimidine Derivative for Selective and Fast Uptake of Cadmium Ions from Aqueous Solution

Environments ◽  
2019 ◽  
Vol 6 (6) ◽  
pp. 68
Author(s):  
Mohamed Ould M’hamed ◽  
Lotfi Khezami
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Kinetics ◽  
Heavy Metal Ions ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Solution Interface ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Thermodynamic Variables

The aim of this work was to evaluate the performance of a 1,2,3,4-tetrahydropyrimidine derivative as a powerful heterocyclic compound for the elimination of Cd(II) ions from aqueous solutions. The tetrahydropyrimidine derivative was prepared during 30 min of milling by planetary ball mill with a ball-to-powder mass ratio of 8:1 and a rotation speed of 750 rpm. Nuclear magnetic resonance (NMR) and infrared (IR) were used to identify the obtained tetrahydropyrimidine derivatives. Furthermore, batches of experiments were carried out to establish the adsorption equilibrium, kinetics, and thermodynamic variables of the tetrahydropyrimidine derivatives for toxic heavy Cd(II) ions. The adsorption data were simulated by applying the Langmuir manner, the Freundlich equation, the pseudo-first-order and pseudo-second-order equations. The adsorption procedure was discovered to be very influenced by PH. The removal of heavy metal ions reached a maximum value quickly within 6 min and the adsorption data better adjusted the Langmuir isotherm than that of the Freundlich isotherm. The maximum Cd(II) ions adsorption capacity was approximated to be 151.16 mg g−1 at 328 K and a pH of 6 to 7. It was found that the adsorption kinetics of Cd(II) ions obeyed pseudo-second-order adsorption kinetics. The examination of the thermodynamic variables of tetrahydropyrimidine derivative showed a spontaneous endothermic adsorption procedure. Otherwise, positive entropy values put forward a rise in the randomness at the solid-solution interface when heavy metal ions are adsorbed.

scholarly journals Novel Mixed Matrix Membranes Based on Polymer of Intrinsic Microporosity PIM-1 Modified with Metal-Organic Frameworks for Removal of Heavy Metal Ions and Food Dyes by Nanofiltration

Membranes ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 14
Author(s):  
Anna Kuzminova ◽  
Mariia Dmitrenko ◽  
Andrey Zolotarev ◽  
Aleksandra Korniak ◽  
Daria Poloneeva ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
High Efficiency ◽  
Metal Organic Frameworks ◽  
Mixed Matrix Membranes ◽  
Polymer Of Intrinsic Microporosity ◽  
Food Dyes ◽  
Metal Organic ◽  
Intrinsic Microporosity

Nowadays, nanofiltration is widely used for water treatment due to its advantages, such as energy-saving, sustainability, high efficiency, and compact equipment. In the present work, novel nanofiltration membranes based on the polymer of intrinsic microporosity PIM-1 modified by metal-organic frameworks (MOFs)—MIL-140A and MIL-125—were developed to increase nanofiltration efficiency for the removal of heavy metal ions and dyes. The structural and physicochemical properties of the developed PIM-1 and PIM-1/MOFs membranes were studied by the spectroscopic technique (FTIR), microscopic methods (SEM and AFM), and contact angle measurement. Transport properties of the developed PIM-1 and PIM-1/MOFs membranes were evaluated in the nanofiltration of the model and real mixtures containing food dyes and heavy metal ions. It was found that the introduction of MOFs (MIL-140A and MIL-125) led to an increase in membrane permeability. It was demonstrated that the membranes could be used to remove and concentrate the food dyes and heavy metal ions from model and real mixtures.

scholarly journals Removal of Heavy Metals from Water and Wastewater Using Moringa oleifera

2021 ◽  
Author(s):  
Eman Noori Ali
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Moringa Oleifera ◽  
Press Cake ◽  
Removal Of Heavy Metals ◽  
Moringa Oleifera Leaves ◽  
Heavy Metal Ions Removal ◽  
Metal Ions Removal

One of the contaminants in wastewater is the heavy metals. Treatment of heavy metals is of great importance because they can be harmful and dangerous for human being health. Conventional removal methods used include: ultrafiltration, reverse osmosis, ion exchange, solvent extraction, sedimentation, and chemical precipitation, and each method has some disadvantages besides high costs. In this chapter, Moringa oleifera cake residue, Moringa oleifera press cake, and Moringa oleifera leaves are introduced as a proposed alternative to replace conventional methods for heavy metal ions’ removal. The results of using Moringa oleifera cake residue showed that iron (Fe) was fully removed; copper (Cu) and cadmium (Cd) were successfully removed up to 98% and reduction of lead (Pb) of 82.17%. The heavy metals were successfully reduced using Moringa oleifera press cake. The removal percentage of iron, copper, and chromium reached 69.99%, 88.86%, and 93.73%, respectively. Moringa oleifera leaves were used to remove Cd (II) from synthetic water; the optimization was performed and each parameter was affecting the Cd (II) removal with different percentages, but pH was insignificant. As a conclusion, the Moringa oleifera seeds and leaves can be considered as a promising alternative in water treatment for heavy metal ions removal.

scholarly journals PEMANFAATAN LIMBAH CANGKANG KERANG BULU SEBAGAI ADSORBEN UNTUK MENJERAP LOGAM KADMIUM (II) DAN TIMBAL (II)

2015 ◽  
Vol 4 (3) ◽  
pp. 40-45
Author(s):  
Akhmad Anugerah S ◽  
Iriany
Keyword(s):  
Heavy Metal ◽  
Moisture Content ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Heavy Metal Ions ◽  
Thermal Activation ◽  
Freundlich Isotherm ◽  
Shell Size ◽  
Activation Temperature

Adsorbent from fur shells could be used to adsorb heavy metal ions such, as Cd (II) and Pb (II). This is shown by the research of adsorption using the fur shells. This research was aimed to characterize the fur shells. Variables in this research were the activation temperature and concentration of the metal solution. This research was begun with reduction of the shell size to 140  mesh, then thermal activation at temperature 110ᴼC, 500ᴼC and 800ᴼC in the furnace. After that adsorbent was characterized using BET, measured its density, moisture content and ash, the adsorption capacity of the adsorbent was tested by using solution of Cd (II) and Pb (II), and then the concentration of the remaining solution was measured by AAS. The result showed that activated adsorbent  at temperatures 110ᴼC, 500ᴼC and 800ᴼC had surface area of 725.43; 807.94; and 803.822 m2/g. Density was inversely proportional to the activation temperature, the value of moisture content and ash obtained were in accordance to SNI. Activated adsorbent at 500ᴼC suitabled with  the Freundlich Isotherm.

4-(2-Pyridylazo)-resorcinol-functionalized polyacrylonitrile fiber through a microwave irradiation method for the simultaneous optical detection and removal of heavy metals from water

2018 ◽  
Vol 4 (4) ◽  
pp. 487-492 ◽  
Author(s):  
Sheng Deng ◽  
GuangShan Zhang ◽  
Peng Wang
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Microwave Irradiation ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Colorimetric Detection ◽  
Optical Detection ◽  
Polyacrylonitrile Fiber ◽  
Microwave Irradiation Method ◽  
Removal Of Heavy Metals

A PAR-functionalized fiber by microwave irradiation has both colorimetric detection and adsorption abilities for heavy metal ions.

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