Electrostatic adsorption and removal mechanism of ochratoxin A in wine via a positively charged nano-MgO microporous ceramic membrane

An innovative titanium dioxide (TiO2) mesh electrode was prepared by anodisation, in which 0.5 M sulphuric acid was used as electrolyte and titanium (Ti) metal mesh was anodised in a two stage anodic process. The innovated mesh electrode was examined using Raman spectroscopy to determine the formation of TiO2 layer when different potentials of 120 V, 140 V, 160 V, and 180 V were applied in anodisation. Microporous surface of the electrode was also examined using scanning electron microscopy. The photocatalytic (PC) oxidation and photoelectrocatalytic (PEC) oxidation were studied using the new electrode for treating synthetic wastewater solutions of dye and trichlorophenol (TCP) respectively. The colour removal efficiency of 68% was achieved using the 160V-mesh electrode for treating wool dye solution after 80 minutes reaction time. However, it was found that a significant substrate adsorption on the surface of the mesh electrode could not be avoided when pH was below pHIEP of TiO2=6.3. In this condition, electrostatic adsorption occurred between the anionic substrate molecules and positively charged TiO2 surface. The adsorbed substrate anion occupied most active sites of TiO2 on the mesh electrode surface and significantly reduced the performance efficiency of photo-oxidation, when the TiO2 mesh electrode was reused. The experiment demonstrated that TCP adsorption on the mesh electrode could be significantly eliminated, when pH of TCP solution was adjusted to above 7. When raising pH in TCP photodegradation eliminated substrate adsorption, it was confirmed that PC oxidation with application of a potential bias could enhance the photo-oxidation rate and a repeatable photo-oxidation rate could be maintained when the same mesh electrode was reused in its following tests.

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Positively charged and flexible SiO2@ZrO2nanofibrous membranes and their application in adsorption and separation

RSC Advances ◽

10.1039/c8ra01899e ◽

2018 ◽

Vol 8 (23) ◽

pp. 13018-13025 ◽

Cited By ~ 9

Author(s):

Yufei Tang ◽

Zhaowei Liu ◽

Kang Zhao ◽

Song Fu

Keyword(s):

Negative Charge ◽

Adsorption Properties ◽

Electrostatic Adsorption ◽

Physical Separation ◽

Nanofiber Membranes ◽

Positively Charged

Tiny particles with a negative charge in water can be removed effectively by inorganic positively charged nanofiber membranes due to their physical separation and electrostatic adsorption properties.

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Nano-structured surface modification of micro-porous ceramic membrane with positively charged nano-Y2O3coating for organic dyes removal

RSC Advances ◽

10.1039/c5ra13925b ◽

2015 ◽

Vol 5 (98) ◽

pp. 80643-80649 ◽

Cited By ~ 5

Author(s):

Lili Zhang ◽

Na Li ◽

Mengfu Zhu ◽

Xiuting Cheng ◽

Yu Deng ◽

...

Keyword(s):

Thermal Decomposition ◽

Surface Modification ◽

Ceramic Membrane ◽

Organic Dyes ◽

Porous Ceramic ◽

Dip Coating ◽

Thermal Decomposition Process ◽

Porous Ceramic Membrane ◽

Positively Charged ◽

Dyes Removal

Through dip-coating and thermal decomposition process, the positively charged ceramic membrane was successfully prepared for negative organic dyes removal.

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Enhanced electrochemical capacitive performance of “sandwich-like” MWCNTs/PANI/PSS-GR electrode materials

RSC Advances ◽

10.1039/c6ra20435j ◽

2016 ◽

Vol 6 (103) ◽

pp. 100954-100961 ◽

Cited By ~ 3

Author(s):

Ranran Zhang ◽

Jun Qian ◽

Shuangli Ye ◽

Yihua Zhou ◽

Ziqiang Zhu

Keyword(s):

Electrode Materials ◽

Oxidative Polymerization ◽

Chemical Oxidative Polymerization ◽

Electrostatic Adsorption ◽

Capacitive Performance ◽

Positively Charged

A novel “sandwich-like” MWCNTs/PANI/PSS-GR nanocomposites are achieved via in situ chemical oxidative polymerization and electrostatic adsorption between the negatively-charged PSS-GR nanosheets and the positively-charged PANI on MWCNTs.

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Synthesis of N-doped graphene-functionalized Zn1.231Ge0.689N1.218O0.782 solid solution as a photocatalyst for CO2 reduction and oxidation of benzyl alcohol under visible-light irradiation

Journal of Materials Chemistry A ◽

10.1039/c7ta02192e ◽

2017 ◽

Vol 5 (22) ◽

pp. 10998-11008 ◽

Cited By ~ 17

Author(s):

Jun Liang ◽

Li Li

Keyword(s):

Solid Solution ◽

Graphene Oxide ◽

High Temperature ◽

Visible Light Irradiation ◽

Co2 Reduction ◽

Electrostatic Adsorption ◽

Doped Graphene ◽

Reduction And Oxidation ◽

Positively Charged

N-Graphene/ZnGeON hybrids were assembled through electrostatic adsorption of positively-charged Zn2GeO4 nanorods with negatively-charged graphene oxide (GO) and calcinated by a high temperature in situ nitridation technique under NH3 flow.

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Protamine-DNA interaction

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100081863 ◽

1978 ◽

Vol 36 (2) ◽

pp. 200-201

Author(s):

D.P. Bazett-Jones ◽

F.P. Ottensmeyer

Keyword(s):

Small Volume ◽

Double Helix ◽

Dna Interaction ◽

Dark Field ◽

Sperm Head ◽

Nuclear Proteins ◽

Field Electron Microscopy ◽

Dark Field Electron ◽

Dna Double Helix ◽

Positively Charged

Dark field electron microscopy has been used for the study of the structure of individual macromolecules with a resolution to at least the 5Å level. The use of this technique has been extended to the investigation of structure of interacting molecules, particularly the interaction between DNA and fish protamine, a class of basic nuclear proteins of molecular weight 4,000 daltons.Protamine, which is synthesized during spermatogenesis, binds to chromatin, displaces the somatic histones and wraps up the DNA to fit into the small volume of the sperm head. It has been proposed that protamine, existing as an extended polypeptide, winds around the minor groove of the DNA double helix, with protamine's positively-charged arginines lining up with the negatively-charged phosphates of DNA. However, viewing protamine as an extended protein is inconsistent with the results obtained in our laboratory.

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Structure and Interaction of Protamine by Dark Field Electron Microscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100090786 ◽

1976 ◽

Vol 34 ◽

pp. 160-161

Author(s):

D.P. Bazett-Jones ◽

F.P. Ottensmeyer

Keyword(s):

Electron Microscopy ◽

Dark Field ◽

Amino Acid Sequences ◽

Dimensional Structure ◽

3 Dimensional ◽

Field Electron ◽

Proposed Model ◽

Field Electron Microscopy ◽

Dark Field Electron ◽

Positively Charged

It has been shown for some time that it is possible to obtain images of small unstained proteins, with a resolution of approximately 5Å using dark field electron microscopy (1,2). Applying this technique, we have observed a uniformity in size and shape of the 2-dimensional images of pure specimens of fish protamines (salmon, herring (clupeine, Y-l) and rainbow trout (Salmo irideus)). On the basis of these images, a model for the 3-dimensional structure of the fish protamines has been proposed (2).The known amino acid sequences of fish protamines show stretches of positively charged arginines, separated by regions of neutral amino acids (3). The proposed model for protamine structure (2) consists of an irregular, right-handed helix with the segments of adjacent arginines forming the loops of the coil.

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A SEM/TEM examination of a ceramic membrane

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100144802 ◽

1986 ◽

Vol 44 ◽

pp. 682-683

Author(s):

C.E. Voegele-Kliewer ◽

A.D. McMaster ◽

G.W. Dirks

Keyword(s):

Electron Microscopy ◽

Gas Separation ◽

Ceramic Membrane ◽

Hydrogen Iodide ◽

Separation Processes ◽

Corning Glass ◽

Gas Transport Properties ◽

Porous Microstructure ◽

Microscopy Techniques ◽

The Relationship

Materials other than polymers, e.g. ceramic silicates, are currently being investigated for gas separation processes. The permeation characteristics of one such material, Vycor (Corning Glass #1370), have been reported for the separation of hydrogen from hydrogen iodide. This paper will describe the electron microscopy techniques applied to reveal the porous microstructure of a Vycor membrane. The application of these techniques has led to an increased understanding in the relationship between the substructure and the gas transport properties of this material.

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