Wyniki wyszukiwania - BazTech

1

Doświadczalne, analityczne i numeryczne badanie membran kompozytowych do rozdzielania mieszanin gazów

Szwast M.

Przemysł Chemiczny

|

2018

|

T. 97, nr 8

1367--1372

PL

Przedstawiono wyniki badań kompozytowych membran przeznaczonych do rozdzielania mieszanin gazów. Doświadczalnie określono przepuszczalności tych membran względem wybranych czystych gazów (jednoskładnikowych) oraz ich właściwości separacyjne względem dwuskładnikowych mieszanin gazów. Podczas badań właściwości separacyjnych, membrany umieszczano w module membranowym z trzema króćcami i wykonywano doświadczenia mające na celu rozdział mieszanin gazów i pomiar stężeń permeatu. Sformułowano model matematyczny opisujący badany proces i wykonano obliczenia modelowych stężeń permeatu. Uzyskano wysoką zgodność wyników doświadczalnych z wynikami obliczeń modelowych.

EN

Three composite polypropylene-matrix membranes were prepd. by dip coating and used for sepn. of binary gas mixts. (MeH/N2, CO2/N2, CO2/MeH). The math. model of the sepn. process was developed to calc. the permeate compn. High compliance of the exptl. data and model calcns. was achived.

2

The Effect of the Type of Admixture on the Properties of Polyacrylonitrile Membranes Modified With Nanotubes, Graphene Oxide and Graphene

Fryczkowska B., Przywara L.

Journal of Ecological Engineering

|

2017

|

Vol. 18, nr 5

72--81

EN

This paper presents the results of research on the production of composite polyacrylonitrile (PAN) membranes with nanotubes (MWCNT), graphene (RG) and graphene oxide (GO) addition. All of the specified additions differ diametrically in terms of properties, starting from the spatial structure of the particles, to the chemical properties. The membranes were obtained using phase inversion method from a solution of N,N-dimethylformamide (DMF). Subsequently, the impact of the nano-addition on the transport and separation properties of the membranes was investigated using Millipore AMICON ultrafiltration kit. Membranes with graphene addition (PAN/RG) are characterized by the best transport properties and the highest specific permeate flux values in the range of ~913÷1006 dm3/m2×h for the working pressure of 2.0 MPa. In order to test the separation properties, electroplating wastewater generated in one of the Silesian galvanizing plants was used. The qualitative and quantitative composition of the wastewater was tested by means of UV-Vis spectrophotometer (HACH) and absorption atomic spectrometry (AAS). The ultrafiltration process carried out on composite membranes allows for the complete removal of phosphate ions and ~88÷94% removal of iron from the waste water. The rejection coefficient of the remaining metals is high: ~35÷85% for copper and ~17÷100% for cadmium.

3

TiO2/bone composite materials for the separation of heavy metal impurities from waste water solutions

Dakroury G., Labib S., Abou El-Nour F. H.

Materials Science Poland

|

2012

|

Vol. 30, No. 3

189--196

EN

Pure bone material obtained from cow meat, as apatite-rich material, and TiO2-bone composite materials are prepared and studied to be used for heavy metal ions separation from waste water solutions. Meat wastes are chemically and thermally treated to control their microstructure in order to prepare the composite materials that fulfill all the requirements to be used as selective membranes with high performance, stability and mechanical strength. The prepared materials are analyzed using Hg-porosimetry for surface characterization, energy dispersive X-ray spectroscopy (EDAX) for elemental analysis and Fourier transform infrared spectroscopy (FTIR) for chemical composition investigation. Structural studies are performed using X-ray diffraction (XRD). Microstructural properties are studied using scanning electron microscopy (SEM) and specific surface area studies are performed using Brunauer-Emmet-Teller (BET) method. XRD studies show that multiphase structures are obtained as a result of 1h sintering at 700-1200 °C for both pure bone and TiO2-bone composite materials. The factors affecting the transport of different heavy metal ions through the selected membranes are determined from permeation flux measurements. It is found that membrane pore size, membrane surface roughness and membrane surface charge are the key parameters that control the transport or rejection of heavy metal ions through the selected membranes.