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Iran produces nanomembrane for treating wastewater

May 26, 2014

Researchers from Iran University of Science and Technology used nanotechnology to produce ceramic nanomembrane that is able to eliminate and degrade different types of pollutants in industrial wastewater.

The membrane simultaneously carries out physical separation and photocatalytic degradation of pollutants with a very high efficiency, Fars News Agency reported.

According to Dr. Vahideh Tajer, one of the researchers, the presence of silica in titania network reduces the size of membrane porosity.

As a result, the membrane is able to eliminate the pollutants based on separation mechanism. In addition, the presence of five molar percent of silica in the membrane increases the ability of the membrane to degrade pollutants by improving its photocatalytic properties.

Therefore, the factors of physical separation and photocatalytic degradation reduce the presence of pollutants in the system. On the other hand, since silica is cheaper than titania, the photocatalytic membrane will be cheaper when titania is replaced by silica in the membrane structure.

According to results obtained by researchers, the average size of pores in the membrane is about 4 nm. The ability of the membrane was investigated by studying the separation of methyl orange as a pollutant from water through physical separation and photocatalytic degradation methods both separately and simultaneously.

Studies show that when UV waves are used, the elimination of methyl orange is about 63 percent by titania-silica composite membrane. However, when the two processes of physical separation and photocatalytic degradation are used at the same time, the separation value reaches 94 percent.

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Source: Iran Daily

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