Fouling as membrane shortcomings

I do not care if this post will contain only a couple hundred words. I just found an interesting definition of cake formation on the membrane surface. As you probably aware, this cake formation along with pore blockage, concentration polarization have caused fouling, sort of clogging in conventional filter, which increase negative value of membrane … Read more

Does TiO2 coating form denser pore size?

Interesting question is raised because that result that what I have got. Interesting, in one side it is known that the coating of TiO2 has caused higher affinity of membrane surface. In my opinion higher affinity, more or less, means higher permeability, higher chance that more water passes the pore of membrane. But my experiment shows the opposite. I just did a simple permeability though, but I think despite of its simplicity, it offers a very powerful tool to gain some insight about what is going on after coating in terms of its ability to allow water pass through the membrane. This post is dedicated to find out is it really true that the coating of TiO2 affect the pore size of membrane surface and make it denser.

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About ultrafiltration: introduction

Combine with microfiltration, ultrafiltration (UF) is a low pressure membrane. UF is usually used for potable water treatment, biological wastewater treatment and also for ultrapure water production. The latter is common method for metal or electronic industries. UF typically operates within 40-1000 kPa (5.8-145 psi) (0.4-10 bar) having molecular weight cut off (MWCO) ranging from 1 kDa to 100 kDa (kilo Dalton).

MWCO is a term used to define 90% of molecular weight of a compound can be retained by the UF. Since UF have higher pore size or MWCO than reverse osmosis (RO), it usually produce higher flux. However, since RO has denser pore size, thus the rejection is become more excellent, even a virus may be filtered out to result a high ultrapure water.

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Gel Filtration Chromatography: protein fractionation

Well known as GFC, this is usually used to fractionate protein. It is based on molecular size, when larger particles will eluete first, followed by smaller molecule. In my experiment, I will employ this to fractionate humic substance. There are several points from which the method in using this GFC. GFC is included in Size Exclusion Chromatography. Size exclusion chromatography (SEC) is a chromatographic method in which particles are separated based on their size. When an aqueous solution is used to transport the sample through the column the technique is known as gel filtration chromatography.

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