December 2016 Current Affairs

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CSMCRI researchers develop photocatalyst to completely degrade industrial dyes

CSMCRI researchers develop photocatalyst to completely degrade industrial dyes
19 August 2016 Current Affairs: Researchers from the Central Salt & Marine Chemicals Research Institute (CSMCRI), Bhavanagar, Gujarat have developed photocatalyst that can completely degrade three industrial dyes in the presence of sunlight. This photocatalyst is able to completely degrade three industrial dyes — methyl orange, methylene blue and reactive black-5.

The photocatalyst was developed using titanium dioxide doped with red seaweed polymer carrageenan (a substance extracted from purple and red seaweeds). Conventionally, titanium dioxide was used for photocatalytic degradation of industrial dyes, but it took long time to degrade dyes. So the researchers from CSMCRI doped titanium dioxide nanoparticles with sulphur and carbon by treating it with carrageenan. 

The nanocomposite was found to behave as an excellent photocatalyst that degraded the industrial dyes quickly in a single-step process. The photocatalyst was found to degrade the dyes when exposed to direct sunlight. When a solar concentrator is used, the intensity of the degradation process of dyes also increased. 

Significance : The nanocomposite photocatalyst is thermally stable. It can be reused up to 6 times with the degradation efficiency remaining at over 97%. It can safely and completely treat harmful dyes in an eco-friendly and cost-effective manner.

Problems :  Annually, more than 500 tonnes of non-degradable textile colour wastes without adequate treatments are being disposed of in natural streams. Presently, despite having stringent environmental regulations a comprehensive method of treating industrial dye is not available. The methods which are available do not completely break down the dye molecules to non-toxic constituents and are also expensive.


December 2016 Current affairs

November 2016 Current affairs
30 NOV
NEWS
29 NOV
NEWS
28 NOV
NEWS
26 NOV
NEWS
25 NOV
NEWS
24 NOV
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October 2016 Current affairs
31 OCT
NEWS
27 OCT
NEWS
26 OCT
NEWS
25 OCT
NEWS
24 OCT
NEWS
22 OCT
NEWS

September 2016 Current affairs
30 SEP
NEWS
29 SEP
NEWS
28 SEP
NEWS
27 SEP
NEWS
26 SEP
NEWS
24 SEP
NEWS

August 2016 Current affairs
31 AUG
NEWS
30 AUG
NEWS
29 AUG
NEWS
27 AUG
NEWS
26 AUG
NEWS
25 AUG
NEWS



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