Syntheses of linear-type S-bridged trinuclear complexes composed of heavy d6 metal ions and 2-aminoethanethiolate: comparative characterization by X-ray diffraction, spectroscopy and electrochemistry

A type of cross-linking starch microsphere (CSMs) has been synthesized via reversed phase suspension method. Crosslinked starch microsphere has good adsorption performance to metal ions in water. The adsorption kinetics of Co (II) on the CSMs, selectivity of adsorption CSMs towards Co (II),Cu (II),Pb (II),Cd (II) and adsorption effects of media towards Co (II) were investigated. The CSMs and its adsorption product were comparatively characterized by X-ray diffraction (XRD). The results showed that The adsorption rate is mainly controlled by liquid film diffusion, and the constant of adsorption rate is 0.0686min-1 at 308K. The crystal structure of the CSMs decreased greatly after the incorporation of Co (II). Co (II) has better adsorption selectivity on CSMs. Ions coexist and other substances in the solution have certain impact on adsorption. Those data are helpful for treatment of the wastewater containing heavy ions.

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Removal of Heavy Metals from Aqueous Solution by Hydroxyapatite/Chitosan Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.789.176 ◽

2013 ◽

Vol 789 ◽

pp. 176-179 ◽

Cited By ~ 3

Author(s):

Eny Kusrini ◽

Nofrijon Sofyan ◽

Dwi Marta Nurjaya ◽

Santoso Santoso ◽

Dewi Tristantini

Keyword(s):

Heavy Metals ◽

Aqueous Solution ◽

Metal Ions ◽

Precipitation Method ◽

X Ray Diffraction ◽

X Ray ◽

Removal Of Heavy Metals ◽

Sem Micrograph ◽

Pseudo Second Order ◽

Chitosan Composite

Hydroxyapatite/chitosan (HApC) composite has been prepared by precipitation method and used for removal of heavy metals (Cr6+, Zn2+and Cd2+) from aqueous solution. The HAp and 3H7C composite with HAp:chitosan ratio of 3:7 (wt%) were characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy-energy dispersive X-ray spectroscopy. The SEM results showed that HAp is spherical-shaped and crystalline, while chitosan has a flat structure. SEM micrograph of 3H7C composite reveals crystalline of HAp uniformly spread over the surface of chitosan. The crystal structure of HAp is maintained in 3H7C composite. Chitosan affects the adsorption capacity of HAp for heavy metal ions; it binds the metal ions as well as HAp. The kinetic data was best described by the pseudo-second order. Surface adsorption and intraparticle diffusion take place in the mechanism of adsorption process. The binding of HAp powder with chitosan made the capability of composite to removal of Cr6+, Zn2+and Cd2+from aqueous solution effective. The order of removal efficiency (Cr6+> Cd2+> Zn2+) was observed.

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Chemical bonding and valence state of 3d-metal ions in Ni 1−x Co x Cr 2 O 4 spinels from X-ray diffraction and X-ray photoelectron spectroscopy data

Journal of Electron Spectroscopy and Related Phenomena ◽

10.1016/j.elspec.2014.07.010 ◽

2014 ◽

Vol 195 ◽

pp. 208-219 ◽

Cited By ~ 10

Author(s):

A.G. Kochur ◽

A.T. Kozakov ◽

K.A. Googlev ◽

A.S. Mikheykin ◽

V.I. Torgashev ◽

...

Keyword(s):

Metal Ions ◽

Chemical Bonding ◽

Photoelectron Spectroscopy ◽

Valence State ◽

Spectroscopy Data ◽

X Ray Diffraction ◽

X Ray

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An N4-Tetradentate Hydrazone Ligand That Binds in a Neutral, Mono- and Bisdeprotonated Form to Iron(II) and Zinc(II) Metal Ions

Crystals ◽

10.3390/cryst11080982 ◽

2021 ◽

Vol 11 (8) ◽

pp. 982

Author(s):

Devaraj Pandiarajan ◽

Thomas Fox ◽

Bernhard Spingler

Keyword(s):

Mass Spectrometry ◽

Coordination Chemistry ◽

Transition Metals ◽

Metal Ions ◽

Elemental Analysis ◽

X Ray Diffraction ◽

Hydrazone Ligand ◽

X Ray

The coordination chemistry of butane-2,3-dione bis (2′-pyridylhydrazone) towards the divalent first-row transition metals zinc and iron has been explored. Depending upon the conditions, the ligand in the six complexes was found to be either neutral, mono, or doubly deprotonated. The zinc(II) and iron(II) complexes were fully characterized by elemental analysis, mass spectrometry, and X-ray diffraction methods.

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Characterization on the Microstructures and Optical Performances of TiO2 Doped with Transition Metals

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.887-888.388 ◽

2014 ◽

Vol 887-888 ◽

pp. 388-394 ◽

Cited By ~ 2

Author(s):

Xin Hua Liu ◽

Yi Deng ◽

Yu Chuan Zhang ◽

Yin Hang Zhou

Keyword(s):

Transition Metal ◽

Metal Ions ◽

Photoelectron Spectroscopy ◽

Transition Metal Ions ◽

Ultraviolet Region ◽

Visible Light Region ◽

X Ray Diffraction ◽

X Ray ◽

Light Region ◽

Cu Ions

The structures and optical performances of TiO2doped with 4thperiodic transition metal ions were investigated in this paper. The characterization results of X-ray photoelectron spectroscopy and X-ray diffraction showed that the transition metal ions existed in oxidative states, and composites formed because of the reaction between doped metal ions and TiO2. The absorption spectroscopy of TiO2doped with zinc was mainly in ultraviolet region, close to that of the pure TiO2. While for TiO2doped with other transition metal ions including V, Cr, Mn, Fe, Co, Ni and Cu ions, the absorption spectroscopies covered ultraviolet region and visible light region, much broader than that of the pure TiO2.

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The Removal of Uranium and Thorium from Their Aqueous Solutions by 8-Hydroxyquinoline Immobilized Bentonite

Minerals ◽

10.3390/min9100626 ◽

2019 ◽

Vol 9 (10) ◽

pp. 626 ◽

Cited By ~ 2

Author(s):

Salah ◽

Gaber ◽

Kandil

Keyword(s):

Aqueous Solutions ◽

Metal Ions ◽

Langmuir Isotherm ◽

Freundlich Isotherm ◽

Order Kinetic ◽

X Ray Diffraction ◽

Solution Ph ◽

X Ray ◽

Order Kinetic Model ◽

Pseudo Second Order

The sorption of uranium and thorium from their aqueous solutions by using 8-hydroxyquinoline modified Na-bentonite (HQ-bentonite) was investigated by the batch technique. Na-bentonite and HQ-bentonite were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier Transform Infrared (FTIR) spectroscopy. Factors that influence the sorption of uranium and thorium onto HQ-bentonite such as solution pH, contact time, initial metal ions concentration, HQ-bentonite mass, and temperature were tested. Sorption experiments were expressed by Freundlich and Langmuir isotherms and the sorption results demonstrated that the sorption of uranium and thorium onto HQ-bentonite correlated better with the Langmuir isotherm than the Freundlich isotherm. Kinetics studies showed that the sorption followed the pseudo-second-order kinetic model. Thermodynamic parameters such as ΔH°, ΔS°, and ΔG° indicated that the sorption of uranium and thorium onto HQ-bentonite was endothermic, feasible, spontaneous, and physical in nature. The maximum adsorption capacities of HQ-bentonite were calculated from the Langmuir isotherm at 303 K and were found to be 63.90 and 65.44 for U(VI) and Th(IV) metal ions, respectively.

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Preparation of Magnetically Modified Zeolites and the Application of Metal Ions Adsorption

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.299-300.764 ◽

2011 ◽

Vol 299-300 ◽

pp. 764-769

Author(s):

Ming Liang Yuan ◽

Liang Yu ◽

Jia Hua Tao ◽

Cong Song

Keyword(s):

Metal Ions ◽

Industrial Effluents ◽

Nitrogen Adsorption ◽

Vibrating Sample Magnetometer ◽

X Ray Diffraction ◽

Detailed Characterization ◽

X Ray ◽

Magnetic Process ◽

Coprecipitation Process

Natural zeolites combined with the magnetic iron oxides are prepared by a chemical coprecipitation process. A detailed characterization of our magnetically modified zeolite (MMZ) is given, including powder X-ray diffraction (XRD), nitrogen adsorption and vibrating sample magnetometer (VSM). The results reveal that in comparison with Na-zeolite, the structure of MMZ has no obvious change but its surface area increases from 25.13 m2g-1to 100.90 m2g-1. The adsorption properties of MMZ to Pb2+and Cu2+were studied. The results show that the maximum loading capacities for Pb2+and Cu2+in the initial concentration range are 123.74 and 14.633 mg g-1, respectively. The MMZ can be used as an adsorbent for removal of heavy metal ions from industrial effluents or municipal waters, and the saturated adsorbent is separated from the medium by a simple magnetic process.

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An EXAFS Investigation of Local Structure around Rb+ in Aqueous Solution

Zeitschrift für Naturforschung A ◽

10.1515/zna-1994-0613 ◽

1994 ◽

Vol 49 (6) ◽

pp. 727-729 ◽

Cited By ~ 10

Author(s):

Yoshihiro Kubozono ◽

Akiko Hirano ◽

Hironobu Maeda ◽

Setsuo Kashino ◽

Shuichi Emura ◽

...

Keyword(s):

Aqueous Solution ◽

Metal Ions ◽

Coordination Number ◽

Local Structure ◽

The Other ◽

Alkaline Metal ◽

X Ray Diffraction ◽

X Ray ◽

Exafs Spectra

Abstract EXAFS spectra have been measured in order to elucidate the local structure around Rb+ in aqueous solution. It has been found that the Rb+ is surrounded by ca. six O atoms of H2O molecules. The Rb -O distance was determined to be 2.90 (3) Å. The coordination number and Rb -O distance compare well with those of the other alkaline metal ions estimated by X-ray diffraction.

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Absorbed Pb2+ and Cd2+ Ions in Water by Cross-Linked Starch Xanthate

International Journal of Polymer Science ◽

10.1155/2017/6470306 ◽

2017 ◽

Vol 2017 ◽

pp. 1-9 ◽

Cited By ~ 5

Author(s):

Kai Feng ◽

Guohua Wen

Keyword(s):

Heavy Metal ◽

Metal Ions ◽

Heavy Metal Ions ◽

Adsorption Mechanism ◽

Potato Starch ◽

Sodium Acrylate ◽

X Ray Diffraction ◽

X Ray ◽

Concentration Of Ions ◽

Cross Linker

A cross-linked starch xanthate was prepared by graft copolymerization of acrylamide and sodium acrylate onto starch xanthate using potassium persulfate and sodium hydrogen sulfite initiating system and N,N′-methylenebisacrylamide as a cross-linker. As this kind of cross-linked potato starch xanthate can effectively absorb heavy metal ions, it was dispersed in aqueous solutions of divalent heavy metal ions (Pb2+ and Cd2+) to investigate their absorbency by the polymer. Factors that can influence absorbency were investigated, such as the ratio of matrix to monomers, the amount of initiator and cross-linker, pH, and the concentration of metal ions. Results were reached and conclusion was drawn that the best synthetic conditions for the polymer adsorbing Pb2+ and Cd2+ were as follows: the quality ratio of matrix to monomers was 1 : 12 and 1 : 11, the amount of initiator was 2.4% and 3.2% of matrix, and the amount of cross-linker was 12 mg and 13 mg. When the initial concentration of ions was 10 mg/L, the highest quantities of adsorption of Pb2+ and Cd2+ were 47.11 mg/g and 36.55 mg/g. Adsorption mechanism was discussed by using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscope (SEM), Energy Dispersive X-Ray Spectroscopy (EDS) test, and adsorption kinetic simulation.

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