scholarly journals Polyethylenimine-Modified Magnetic Chitosan for the Uptake of Arsenic from Water

2021 ◽  
Vol 11 (12) ◽  
pp. 5630
Author(s):  
Norah Salem Alsaiari ◽  
Fatimah Mohammed Alzahrani ◽  
Khadijah Mohammedsaleh Katubi ◽  
Abdelfattah Amari ◽  
Faouzi Ben Rebah ◽  
...  
Keyword(s):  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
Arsenic Uptake ◽  
Magnetic Chitosan ◽  
Adsorbent Dosage ◽  
Transmission Electron ◽  
Global Environmental ◽  
Removal Of Heavy Metals ◽  
Ir Transmission ◽  
Ft Ir

The removal of heavy metals from water has become a global environmental problem. Various materials have been applied as adsorbent to remove metals from water. In this field, nanomaterials have been gaining increasing interest due to their exceptional properties. In this work, we discuss the synthesis of a core-shell structure nanocomposite by the modification of magnetic chitosan (CS) (Fe3O4/CS) with polyethylenimine (PEI) to produce Fe3O4/CS/PEI composite for the adsorption of arsenic ions (As(V) and As(III)) from aqueous solution. The synthesized materials were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM), and vibrating sample magnetometer (VSM). The results indicated the successful combination of three components of the nanocomposite. The adsorption conditions were optimized by studying the effect of different parameters included pH, contact time, initial concentration, and adsorbent dosage. The optimum adsorption pH was found to be 6.7 while the optimum adsorbent dosage was found to be 2.0 and 1.5 g/L for As(III) and As(V), respectively. The removal efficiency for the uptake of As(III) and As(V) ions over Fe3O4/CS/PEI nanocomposite at optimum conditions was found to be 99.5 and 99.7%, respectively. The experimental results were fitted using Freundlich’s and Langmuir’s isotherms. The data were more fitted to Langmuir isotherm providing a suggestion of monolayer adsorption with maximum adsorption capacity equal to 77.61 and 86.50 mg/g for the removal of As(III) and As(V), respectively. Moreover, linear regression coefficient (R2) indicated that the adsorption of arsenic ions over the synthesized magnetic nanocomposite obeyed pseudo 2nd order suggesting the chemisorption process. The reusability of the nanosorbent for arsenic uptake using sodium hydroxide as eluent was also assessed up to five cycles. Interestingly, Fe3O4/CS/PEI nanocomposite can be considered as a promising adsorbent for As ions’ removal from water and should be tested for the removal of other pollutants.

Carbon Nanotube Templated Growth of the Nano-Crystalline NaY Zeolite

2011 ◽  
Vol 194-196 ◽  
pp. 594-597
Author(s):  
Ke Tang ◽  
Xin Hong ◽  
Jin Gang Qi
Keyword(s):  
Structural Characteristics ◽  
Internal Diameter ◽  
X Ray Diffraction ◽  
Nay Zeolite ◽  
Nano Crystalline ◽  
Transmission Electron ◽  
Ir Transmission ◽  
Ft Ir ◽  
Nay Zeolites ◽  
Nanosized Zeolites

FAU-type(NaY) zeolites nanocrystals have been synthesized through crystallization of gel in mesoporous system of carbon nanotubes(CNTS) with a internal diameter of 20~30 nm. Investigation by using X-ray diffraction (XRD), Fourier transform infrared (FT-IR), transmission electron microscope (TEM) shows that the nanocrystals possess the typical nanosized zeolites structural characteristics which is different from those of microsized zeolites.

scholarly journals Synthesis, Characterization, and Tribological Behavior of Oleic Acid Capped Graphene Oxide

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Tiedan Chen ◽  
Yanqiu Xia ◽  
Zhengfeng Jia ◽  
Zhilu Liu ◽  
Haobo Zhang
Keyword(s):  
Graphene Oxide ◽  
Oleic Acid ◽  
Friction And Wear ◽  
Graphite Powder ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Transmission Electron ◽  
Alpha Olefin ◽  
Ir Transmission ◽  
Ft Ir

Graphene oxide (GO) nanosheets were prepared by modified Hummers and Offeman methods. Furthermore, oleic acid (OA) capped graphene oxide (OACGO) nanosheets were prepared and characterized by means of Fourier transform-infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), and X-ray diffraction (XRD). At the same time, the friction and wear properties of OA capped graphite powder (OACG), OACGO, and oleic acid capped precipitate of graphite (OACPG) as additives in poly-alpha-olefin (PAO) were compared using four-ball tester and SRV-1 reciprocating ball-on-disc friction and wear tester. By the addition of OACGO to PAO, the antiwear ability was improved and the friction coefficient was decreased. Also, the tribological mechanism of the GO was investigated.

Poly(L-Lactide) Composite Nanofibers Incorporating POSS-MWNTs

2011 ◽  
Vol 175-176 ◽  
pp. 341-344 ◽  
Author(s):  
Byoung Suhk Kim ◽  
Kyu Oh Kim ◽  
Ick Soo Kim
Keyword(s):  
Composite Nanofibers ◽  
X Ray Diffraction ◽  
Multiwalled Carbon ◽  
Raman Analysis ◽  
X Ray ◽  
Polyhedral Oligosilsesquioxane ◽  
Hybrid Nanofibers ◽  
Transmission Electron ◽  
Ir Transmission ◽  
Ft Ir

We report the electrospun poly(L-lactide) (PLA) nanofibers incorporating polyhedral oligosilsesquioxane (POSS)-modified multiwalled carbon nanotubes (MWNTs). FT-IR, transmission electron microscopy (TEM) and Raman analysis confirmed the existence of POSS macromers bonded to the MWNTs as an extra phase. The thermal and microstructure properties of the PLA hybrid nanofibers with POSS-modified MWNTs were investigated by thermogravimetric analysis (TGA) and Wide-angle X-ray diffraction (WAXD).

Carbon Nanotube Templated Growth of Nano-Crystallinity ZSM-5

2011 ◽  
Vol 299-300 ◽  
pp. 1020-1023 ◽  
Author(s):  
Ke Tang ◽  
Xin Hong
Keyword(s):  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Structural Characteristics ◽  
Carbon Matrix ◽  
Internal Diameter ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Ir Transmission ◽  
Ft Ir ◽  
Nanosized Zeolites

MFI-type(ZSM-5) zeolite nanocrystals with SiO2/Al2O3ratios of 100 has been synthesized through crystallization of gel in mesoporous system of carbon nanotubes(CNTS) with internal diameter of 20~30nm. Investigation by using X-ray diffraction (XRD), Fourier transform infrared (FT-IR), transmission electron microscope (TEM) and scanning electron microscope (SEM) shows that the nanocrystals possess the typical nanosized zeolites structural characteristics which is different from those of microsized zeolites. Compared with those of the corresponding sample synthesized in hydrothermal system, the bands of the nanosized sample are shifted slightly to lower or higher wavenumbers. The TEM images of the purified carbon nanotubes and nanosized ZSM-5 crystals after the removal of the carbon matrix suggest that clean and homogeneous carbon nanotubes have internal diameters of approximately 20~30 nm and the most crystal sizes are in the range 30~60nm. The SEM photograph verifies the existing of nanosized ZSM-5.

scholarly journals Removal of Phosphorus from Wastewater by Different Morphological Alumina

Molecules ◽  
2020 ◽  
Vol 25 (13) ◽  
pp. 3092
Author(s):  
Jianchuan Sun ◽  
Awang Gao ◽  
Xuhui Wang ◽  
Xiangyu Xu ◽  
Jiaqing Song
Keyword(s):  
Adsorption Capacity ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
Phosphorus Adsorption ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir ◽  
Series Of Experiments ◽  
Level 1 ◽  
Adsorption Desorption

In this work, an organic-free method was used to synthesize different morphological boehmite by controlling the crystallization temperature, and alumina adsorbents were obtained by baking the boehmites at 500 °C. The alumina adsorbents were characterized by X-ray diffraction (XRD), High resolution transmission electron microscope (HRTEM), Fourier transform infrared (FT-IR), N2 adsorption/desorption analysis, and their phosphorus adsorption properties were comparatively investigated by a series of experiments. The results showed that the self-prepared alumina adsorbents were lamellar and fibrous material, while the industrial adsorbent was a granular material. The lamellar alumina adsorbents had the largest specific surface area and showed better phosphorus adsorption capacity. The maximum adsorption capacity could reach up to 588.2 mg·g−1; and only 0.8 g·L−1 of lamellar alumina adsorbent is needed to treat 100 mg·L−1 phosphorus solution under the Chinese level 1 discharge standard (0.5 mg·L−1). Further investigation suggests that the lamellar alumina adsorbent kept high adsorption capacity in various solution environments.

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.

Synthesis and Characterization of GO-Chit-Ni Nanocomposite as a Recoverable Nanocatalyst for Reducing Nitroarenes in Water

2020 ◽  
Vol 17 (7) ◽  
pp. 523-531
Author(s):  
Mosayeb Sarvestani ◽  
Roya Azadi
Keyword(s):  
Fourier Transforms ◽  
Considerable Change ◽  
Environmentally Benign ◽  
X Ray Diffraction ◽  
Simple Method ◽  
Transmission Electron ◽  
Ir Transmission ◽  
Aryl Amines ◽  
Ft Ir

In the present study, nickel nanoparticles (Ni-NPs) immobilized on graphene oxide-chitosan (GO-Chit-Ni) have been synthesized and characterized as a catalyst for reduction of nitroarenes in water. For this purpose, GO has been functionalized with chitosan (GO-Chit). Then, Ni-NPs were immobilized on the surface of GO-Chit using a simple method. The GO-Chi-Ni nanocomposites were characterized using Fourier Transforms Infrared Spectroscopy (FT-IR), Transmission Electron Microscopy (TEM), X-Ray Diffraction Measurements (XRD), and Atomic Adsorption Spectrometry (AAS). The GO-Chi-Ni nanoparticles demonstrated appropriate catalytic activity in reducing nitroarenes to aryl amines in the existence of sodium borohydride (NaBH4) aqueous solution as a hydrogen source at 80oC. This catalytic system applies environmentally benign water as a solvent that is cheap, easily accessible, non-toxic, non-volatile, non-flammable and thermally stable. This type of catalyst can be applied several times with no considerable change in its performance.

scholarly journals One pot three component synthesis of substituted 3,4,6,7-tetrahydro-3,3,6,6-tetramethyl-9,10-diphenylacridine-1,8(2H,5H,9H,10H)-diones catalyzed by efficient In2O3-SiO2

2021 ◽  
Author(s):  
Deepak Totaram Tayde ◽  
Madhukar E. Navgire ◽  
Machhindra K. Lande
Keyword(s):  
High Yield ◽  
Reusable Catalyst ◽  
X Ray Diffraction ◽  
One Pot ◽  
Synthetic Strategy ◽  
Transmission Electron ◽  
Catalytic Material ◽  
Ir Transmission ◽  
Ft Ir ◽  
Temperature Programmed

Abstract A convenient, One pot synthesis of heterocyclic nucleous acridine derivative compound has been achieved those are having very much attention in medicinal chemistry because of their extensive application in biology. The mixture of dimedone, substituted benzaldehyde and aniline were catalyzed by efficient In2O3-SiO2 heterogeneous reusable catalyst in ethanol to obtain the desired acridine derivatives with good yield. Hydrothermal method used to synthesize In2O3-SiO2 catalytic material. This catalytic material were characterized by using X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), Energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), Transmission electron microscope (TEM), Temperature-programmed desorption (NH3-TPD) and Brunauer-Emmett-Teller (BET). Our synthetic strategy features high yield, simple work up procedure, non-toxic, clean, and easy recovery and reusability of the catalytic system.

scholarly journals Hydrothermal Synthesis, Characterization and Exploration of Photocatalytic Activities of Polyoxometalate: Ni-CoWO4 Nanoparticles

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 456
Author(s):  
Fahad A. Alharthi ◽  
Hamdah S. Alanazi ◽  
Amjad Abdullah Alsyahi ◽  
Naushad Ahmad
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Structure Morphology ◽  
Photocatalytic Activities ◽  
Ft Ir ◽  
Photocatalytic Reactions ◽  
Cobalt Tungstate

This study demonstrated the hydrothermal synthesis of bimetallic nickel-cobalt tungstate nanostructures, Ni-CoWO4 (NCW-NPs), and their phase structure, morphology, porosity, and optical properties were examined using X-ray Diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), Scanning electron microscopy- energy dispersive X-ray spectroscopy (SEM-EDS), high resolution Transmission electron microscopy (HR-TEM), Brunauer-Emmett-Teller (BET) and Raman instruments. It was found that as-calcined NCW-NPs have a monoclinic phase with crystal size ~50–60 nm and is mesoporous. It possessed smooth, spherical, and cubic shape microstructures with defined fringe distance (~0.342 nm). The photocatalytic degradation of methylene blue (MB) and rose bengal (RB) dye in the presence of NCW-NPs was evaluated, and about 49.85% of MB in 150 min and 92.28% of RB in 90 min degraded under visible light. In addition, based on the scavenger’s study, the mechanism for photocatalytic reactions is proposed.

Efficient adsorption of chlorpyrifos onto modified activated carbon by gamma irradiation; a plausible adsorption mechanism

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohamed S. Yahia ◽  
Ahmed S. Elzaref ◽  
Magdy B. Awad ◽  
Ahmed M. Tony ◽  
Ahmed S. Elfeky
Keyword(s):  
Gamma Irradiation ◽  
Area Measurement ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Order ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Pseudo First Order ◽  
Kinetics Of

Abstract Commercial Granulated Active Carbon (GAC) has been modified using 10 Gy dose Gamma irradiation (GAC10 Gy) for increasing its ability of air purification. Both, the raw and treated samples were applied for removing Chlorpyrifos pesticide (CPF) from ambient midair. Physicochemical properties of the two materials were characterized by Fourier Transform Infrared (FT-IR) and Raman spectroscopy. The phase formation and microstructure were monitored using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), supported with Energy-Dispersive X-ray (EDX). The Surface area measurement was detected using BET particle size prosometry. Obtained outcomes showed that, the maximum adsorption capacity, given by Langmuir equations, was greatly increased from 172.712 to 272.480 mg/g for GAC and GAC10 Gy, respectively, with high selectivity. The overall removal efficiency of GAC10 Gy was notably comparable to that of the original GAC-sorbent. The present study indicated that, gamma irradiation could be a promising technique for treating GAC and turned it more active in eliminating the pesticides pollutants from surrounding air. The data of equilibrium has been analyzed by Langmuir and Freundlich models, that were considerably better suited for the investigated materials than other models. The process kinetics of CPF adsorbed onto both tested carbon versions were found to obey the pseudo first order at all concentrations with an exception at 70 mg/l using GAC, where, the spontaneous exothermic adsorption of Chlorpyrifos is a strong function for the pseudo-first order (PFO) and pseudo second order (PSO) kinetics.

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