Effects of structural changes of the pretreating agent on adsorption by modified silica adsorbents

1969 ◽  
Vol 41 (8) ◽  
pp. 1058-1065 ◽  
Author(s):  
R. E. Majors ◽  
Lockhart B. Rogers
Keyword(s):  
Structural Changes ◽  
Modified Silica ◽  
Silica Adsorbents

Radiation synthesis of imidazolium-based ionic liquids modified silica adsorbents for ReO4- adsorption

2021 ◽  
Author(s):  
Kangjun Xie ◽  
Zhen Dong ◽  
Nan Wang ◽  
Wei Qi ◽  
Long Zhao
Keyword(s):  
Ionic Liquids ◽  
Environmental Security ◽  
Radioactive Wastes ◽  
Modified Silica ◽  
Radiation Synthesis ◽  
Silica Adsorbents ◽  
Selective Elimination

The selective elimination of radioactive TcO4- from radioactive wastes is becoming increasingly critical for environmental security. In this work, a series of novel adsorbents (Si-IL-X, X= NO3, Cl, BF4, NTf2)...

Metal-modified silica adsorbents for removal of humic substances in water

2005 ◽  
Vol 283 (2) ◽  
pp. 300-310 ◽  
Author(s):  
Takeshi Moriguchi ◽  
Kazuyuki Yano ◽  
Muneaki Tahara ◽  
Kazuhiko Yaguchi
Keyword(s):  
Humic Substances ◽  
Modified Silica ◽  
Silica Adsorbents

Modified Silica Adsorbents for Toluene Adsorption under Dry and Humid Conditions: Impacts of Pore Size and Surface Chemistry

Langmuir ◽  
2019 ◽  
Vol 35 (27) ◽  
pp. 8927-8934 ◽  
Author(s):  
Shuai Liu ◽  
Yue Peng ◽  
Tao Yan ◽  
Yani Zhang ◽  
John Crittenden ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Pore Size ◽  
Modified Silica ◽  
Silica Adsorbents

Synthesis of HS/NH2-Bi-Functional Mesoporous Silica and its Adsorption of Co(II) and Mn(II) in Dilute Solutions

2012 ◽  
Vol 178-181 ◽  
pp. 586-590 ◽  
Author(s):  
Qing Xu Yao ◽  
Ming Chun Jia ◽  
Jin Feng Men
Keyword(s):  
Chelating Agents ◽  
Order Equation ◽  
Silica Gels ◽  
Molar Ratio ◽  
Dilute Solutions ◽  
Modified Silica ◽  
Silica Adsorbents ◽  
Pseudo Second Order ◽  
Adsorption Of Co ◽  
Modified Silica Gels

Bi-functional mesoporsous silica adsorbents, functionalized via the introduction of chelating agents (mercaptopropyl and aminopropyl groups) were prepared to adsorb Co2+ and Mn2+ in dilute solutions. The molar ratio of MPTMS/APTMS in grafting process seemed to have great effected on the mesostructure of adsorbents, and the appropriate value was considered to be 2/1. The modified silica gels at that ratio showed well-ordered property as well as its high infinity of the two metal ions. The pseudo-second-order equation was applied to describe the adsorption kinetics. And the influence of interferential ions Ca2+ and Mg2+ was also studied.

Variables in the preparation of modified silica adsorbents

1969 ◽  
Vol 41 (8) ◽  
pp. 1052-1057 ◽  
Author(s):  
R. E. Majors ◽  
Lockhart B. Rogers
Keyword(s):  
Modified Silica ◽  
Silica Adsorbents

Fine Structural Changes in the Microvasculature of the Mouse Pinna: Aging and Radiation Injury

1974 ◽  
Vol 32 ◽  
pp. 54-55
Author(s):  
S. Phyllis Steamer ◽  
Rosemarie L. Devine
Keyword(s):  
Structural Changes ◽  
Radiation Treatment ◽  
Arterial Stenosis ◽  
Ultrastructural Changes ◽  
Vascular Effects ◽  
Microvascular Changes ◽  
Surrounding Connective Tissue ◽  
Fission Neutrons ◽  
Total Body

The importance of radiation damage to the skin and its vasculature was recognized by the early radiologists. In more recent studies, vascular effects were shown to involve the endothelium as well as the surrounding connective tissue. Microvascular changes in the mouse pinna were studied in vivo and recorded photographically over a period of 12-18 months. Radiation treatment at 110 days of age was total body exposure to either 240 rad fission neutrons or 855 rad 60Co gamma rays. After in vivo observations in control and irradiated mice, animals were sacrificed for examination of changes in vascular fine structure. Vessels were selected from regions of specific interest that had been identified on photomicrographs. Prominent ultrastructural changes can be attributed to aging as well as to radiation treatment. Of principal concern were determinations of ultrastructural changes associated with venous dilatations, segmental arterial stenosis and tortuosities of both veins and arteries, effects that had been identified on the basis of light microscopic observations. Tortuosities and irregularly dilated vein segments were related to both aging and radiation changes but arterial stenosis was observed only in irradiated animals.

Evaluation of single-electron movies of glutamine synthetase molecules

1983 ◽  
Vol 41 ◽  
pp. 280-281
Author(s):  
W. Kunath ◽  
E. Zeitler ◽  
M. Kessel
Keyword(s):  
Electron Microscope ◽  
Glutamine Synthetase ◽  
Electron Irradiation ◽  
Structural Damage ◽  
Structural Changes ◽  
Single Electron ◽  
Continuous Series ◽  
Digital Recording ◽  
Recording Device ◽  
Low Exposure

The features of digital recording of a continuous series (movie) of singleelectron TV frames are reported. The technique is used to investigate structural changes in negatively stained glutamine synthetase molecules (GS) during electron irradiation and, as an ultimate goal, to look for the molecules' “undamaged” structure, say, after a 1 e/Å2 dose.The TV frame of fig. la shows an image of 5 glutamine synthetase molecules exposed to 1/150 e/Å2. Every single electron is recorded as a unit signal in a 256 ×256 field. The extremely low exposure of a single TV frame as dictated by the single-electron recording device including the electron microscope requires accumulation of 150 TV frames into one frame (fig. lb) thus achieving a reasonable compromise between the conflicting aspects of exposure time per frame of 3 sec. vs. object drift of less than 1 Å, and exposure per frame of 1 e/Å2 vs. rate of structural damage.

Fine Structural Changes in the Adenohypophyses of Rats Following Destruction of the Pituitary Stalk

1977 ◽  
Vol 35 ◽  
pp. 496-497
Author(s):  
K. Kovacs ◽  
E. Horvath ◽  
J. M. Bilbao ◽  
F. A. Laszlo ◽  
I. Domokos
Keyword(s):  
Structural Changes ◽  
Tissue Injury ◽  
Anterior Lobe ◽  
Uranyl Acetate ◽  
Male Rats ◽  
Pituitary Stalk ◽  
Sequence Of Events ◽  
Pituitary Glands ◽  
Electrolytic Lesions ◽  
Ultrathin Sections

Electrolytic lesions of the pituitary stalk in rats interrupt adenohypophysial blood flow and result in massive infarction of the anterior lobe. In order to obtain a deeper insight into the morphogenesis of tissue injury and to reveal the sequence of events, a fine structural investigation was undertaken on adenohypophyses of rats at various intervals following destruction of the pituitary stalk.The pituitary stalk was destroyed electrolytically, with a Horsley-Clarke apparatus on 27 male rats of the R-Amsterdam strain, weighing 180-200 g. Thirty minutes, 1,2,4,6 and 24 hours after surgery the animals were perfused with a glutaraldehyde-formalin solution. The skulls were then opened and the pituitary glands removed. The anterior lobes were fixed in glutaraldehyde-formalin solution, postfixed in osmium tetroxide and embedded in Durcupan. Ultrathin sections were stained with uranyl acetate and lead citrate and investigated with a Philips 300 electron microscope.

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