Waste Recycle using Nanotechnology : Environment for UPSC Exams

• Traditional methods for the treatment of industrial dyes are expensive and do not completely break them down to non-toxic constituents but merely concentrate them.

• Reseachers have developed a photo-catalytic degradation agent using titanium dioxide nano-particles doped with sulphur and carbon by treating it with red seaweed polymer carrageenan.

• The energy required to activate the catalyst is less when it is doped, making the dye degradation faster than the traditionally available ones.

• The researchers have been able to totally degrade three industrial dyes - methyl orange, methylene blue and reactive black-5 - in the presence of sunlight.

• Visible light is mainly responsible for the degradation.

• Further advantage is that the nano-composites are thermally stable and can be reused up to six times with the degradation efficiency remaining at over 97 per cent.

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