chemical
Photocatalytic degradation of methylene blue using TiO2 nanoparticles
Nupur Mittal
Chemical Engineering, IIT (BHU) Varanasi.
Abstract: The aim of this research is to reduce the pollution caused by methylene blue dye in waste water coming from textile industries. For this purpose, TiO2 nanoparticles are made as they show good photocatalytic activity in degradation of dyes into harmless products. Synthesis is done using titanium butoxide and 2-propanol. The particles formed were a little larger than 100 nm but after adding sodium lauryl sulphate as surfactant, the correct sized nanoparticles were formed. These nanoparticle which are TiO2 (Degussa, Aeroxide P25, 90% anatase) were used in degradation of dye using batch reactor in which glass cylinder was inserted with UV light source and was covered from top. Reactor was kept on stirrer and air was passed from the bottom. Different concentrated dye solutions were used for experimentation with changing amount of TiO2 and reactor time. Result showed that there is decrease in concentration of dye. Rate of degradation got slower with time and concentration. The amount of photo catalyst also affected the rate. Stirrer was stopped after some time; decrease in concentration was little affected. Form this experiment it was concluded that degradation of dye can be easily done for water which is highly concentrated with methylene blue dye. Even large amount of dye polluted water present in lake can be naturally degraded by UV light from sunrays and atmospheric air by just adding TiO2 nanoparticles. It can prove to be a very cost effective method.
1.
1. Introduction
Textile dyes and other industrial dyestiffs constitute one of the largest groups of organic compounds that represent an increasing environmental danger. About 20% of the total world production of dyes is lost during the dyeing process and is released in the textile effluents. The release of those colored waste waters into the environment is a considerable
Nupur Mittal
Chemical Engineering, IIT (BHU) Varanasi.
Abstract: The aim of this research is to reduce the pollution caused by methylene blue dye in waste water coming from textile industries. For this purpose, TiO2 nanoparticles are made as they show good photocatalytic activity in degradation of dyes into harmless products. Synthesis is done using titanium butoxide and 2-propanol. The particles formed were a little larger than 100 nm but after adding sodium lauryl sulphate as surfactant, the correct sized nanoparticles were formed. These nanoparticle which are TiO2 (Degussa, Aeroxide P25, 90% anatase) were used in degradation of dye using batch reactor in which glass cylinder was inserted with UV light source and was covered from top. Reactor was kept on stirrer and air was passed from the bottom. Different concentrated dye solutions were used for experimentation with changing amount of TiO2 and reactor time. Result showed that there is decrease in concentration of dye. Rate of degradation got slower with time and concentration. The amount of photo catalyst also affected the rate. Stirrer was stopped after some time; decrease in concentration was little affected. Form this experiment it was concluded that degradation of dye can be easily done for water which is highly concentrated with methylene blue dye. Even large amount of dye polluted water present in lake can be naturally degraded by UV light from sunrays and atmospheric air by just adding TiO2 nanoparticles. It can prove to be a very cost effective method.
1.
1. Introduction
Textile dyes and other industrial dyestiffs constitute one of the largest groups of organic compounds that represent an increasing environmental danger. About 20% of the total world production of dyes is lost during the dyeing process and is released in the textile effluents. The release of those colored waste waters into the environment is a considerable
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