Membrane Modification Using Polydopamine and/or PDA Coated TiO2 Nano Particles for Wastewater Treatment

Carbon nanolines on carbon cloth were prepared via a two-step method at 600-900°C for 30 min in a horizontal chemical vapor deposition (CVD) furnace, with Ni nano-particles as catalyst and ethylene as carbon source. XRD and SEM were used to examine the as-synthesized products. The result indicates that the pyrolysis temperature of 900°C is the most suitable to produce the carbon nanolines. The dimension and length of carbon nanolines are about 20nm and are well distributed, respectively. The as-synthesized carbon nanolines/carbon cloth is convenient and low-cost for adsorption materials of wastewater treatment, reinforcement of carbon/carbon composites. The growth mechanism of the as-synthesized carbon nanolines is simplely discussed.

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State-of-the-Art Ceramic Membranes for Oily Wastewater Treatment: Modification and Application

Membranes ◽

10.3390/membranes11110888 ◽

2021 ◽

Vol 11 (11) ◽

pp. 888

Author(s):

Mingliang Chen ◽

Sebastiaan G. J. Heijman ◽

Luuk C. Rietveld

Keyword(s):

Wastewater Treatment ◽

Membrane Fouling ◽

Membrane Filtration ◽

Ceramic Membrane ◽

Sol Gel ◽

Ceramic Membranes ◽

Oily Wastewater ◽

Membrane Modification ◽

Flux Enhancement ◽

Oily Wastewater Treatment

Membrane filtration is considered to be one of the most promising methods for oily wastewater treatment. Because of their hydrophilic surface, ceramic membranes show less fouling compared with their polymeric counterparts. Membrane fouling, however, is an inevitable phenomenon in the filtration process, leading to higher energy consumption and a shorter lifetime of the membrane. It is therefore important to improve the fouling resistance of the ceramic membranes in oily wastewater treatment. In this review, we first focus on the various methods used for ceramic membrane modification, aiming for application in oily wastewater. Then, the performance of the modified ceramic membranes is discussed and compared. We found that, besides the traditional sol-gel and dip-coating methods, atomic layer deposition is promising for ceramic membrane modification in terms of the control of layer thickness, and pore size tuning. Enhanced surface hydrophilicity and surface charge are two of the most used strategies to improve the performance of ceramic membranes for oily wastewater treatment. Nano-sized metal oxides such as TiO2, ZrO2 and Fe2O3 and graphene oxide are considered to be the potential candidates for ceramic membrane modification for flux enhancement and fouling alleviation. The passive antifouling ceramic membranes, e.g., photocatalytic and electrified ceramic membranes, have shown some potential in fouling control, oil rejection and flux enhancement, but have their limitations.

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The Effect of Membrane Modification Using TiO2, ZnO, and GO Nanoparticles: Challenges and Future Direction in Wastewater Treatment

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1053/1/012135 ◽

2021 ◽

Vol 1053 (1) ◽

pp. 012135

Author(s):

TD Kusworo ◽

R E Nugraheni ◽

N Aryanti

Keyword(s):

Wastewater Treatment ◽

Membrane Modification ◽

Future Direction

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Electron holography of catalysts

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100138452 ◽

1995 ◽

Vol 53 ◽

pp. 416-417

Author(s):

A. K. Datye ◽

D. S. Kalakkad ◽

L. F. Allard ◽

E. Völkl

Keyword(s):

Heterogeneous Catalysts ◽

High Surface ◽

High Surface Area ◽

Atomic Scale ◽

Nano Particles ◽

Phase Image ◽

Electron Holography ◽

Specimen Thickness ◽

Phase Information ◽

Particle Structure

The active phase in heterogeneous catalysts consists of nanometer-sized metal or oxide particles dispersed within the tortuous pore structure of a high surface area matrix. Such catalysts are extensively used for controlling emissions from automobile exhausts or in industrial processes such as the refining of crude oil to produce gasoline. The morphology of these nano-particles is of great interest to catalytic chemists since it affects the activity and selectivity for a class of reactions known as structure-sensitive reactions. In this paper, we describe some of the challenges in the study of heterogeneous catalysts, and provide examples of how electron holography can help in extracting details of particle structure and morphology on an atomic scale.Conventional high-resolution TEM imaging methods permit the image intensity to be recorded, but the phase information in the complex image wave is lost. However, it is the phase information which is sensitive at the atomic scale to changes in specimen thickness and composition, and thus analysis of the phase image can yield important information on morphological details at the nanometer level.

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Coherent electron nanodiffraction from clean silver nano particles in a UHV STEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010015112x ◽

1993 ◽

Vol 51 ◽

pp. 1058-1059

Author(s):

J. Liu ◽

M. Pan ◽

G. E. Spinnler

Keyword(s):

Supported Catalysts ◽

Imaging Techniques ◽

Nano Particles ◽

Metal Particles ◽

Shape Structure ◽

Dynamical Simulations ◽

Small Metal Particles ◽

Extract Information

Small metal particles have peculiar chemical and physical properties as compared to bulk materials. They are especially important in catalysis since metal particles are common constituents of supported catalysts. The structural characterization of small particles is of primary importance for the understanding of structure-catalytic activity relationships. The shape and size of metal particles larger than approximately 5 nm in diameter can be determined by several imaging techniques. It is difficult, however, to deduce the shape of smaller metal particles. Coherent electron nanodiffraction (CEND) patterns from nano particles contain information about the particle size, shape, structure and defects etc. As part of an on-going program of STEM characterization of supported catalysts we report some preliminary results of CEND study of Ag nano particles, deposited in situ in a UHV STEM instrument, and compare the experimental results with full dynamical simulations in order to extract information about the shape of Ag nano particles.

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