Photocatalytic Water Purification

Kristina Hariyani

1400710002

Environmental Engineering

What is it?

• It’s an acceleration of photoreaction with the use of a catalys.

• Photocatalytic technology is discovered by Fujishima and Honda in 1972.

• Photocatalytic technology had been used in the removal of organic and inorganic species from aqueous or gas phase.

• In recent year, research focused on the use of semiconductor compound as photocatalytic material

• Semiconductor compound such as TiO2 , ZnO , MgO , WO3 , Fe2O3, and CdS.

• The most popular semiconductor compound in photocatalytic technology is TiO2 because it has been proven non toxic.

• Photocatalytic technology can be use as a disinfectant in water treatment

How Does It Work?

The process of photocatalysis which use a semiconductor oxide such as TiO2 is absorbing a photon with energy that equal to, or greater than the band gap of the semiconductor (ca.3.2 eV for anatase), to create a pairs of electron-hole (e-/h+).

How Does It Work?

On polluted water the catalysts will carry out the substrate from the oxidations and reductions process simultaneously.

Where can We Find this Technology?

• Waste water treatment plant;

• As textile chemical color degradation on textile factory;

• As a treatment for water-soluble pesticides

Demonstration machine of Photocatalytic Water Purification TechnologySource:http://news.panasonic.com/global/stories/2014/30520.html

Thank You

Reference

• http://rachmakimhunter.blogspot.com/p/kimia-fisik_01.html

• http://www.kemenperin.go.id/download/4657/Efek-Fotokatalisis-Nano-TiO2-Terhadap-Mekanisme-Antimikrobia-E-COLI-dan-SALMONELLA

• http://pdm-mipa.ugm.ac.id/ojs/index.php/bimipa/article/download/31/45

• http://www.sswm.info/sites/default/files/reference_attachments/MULLER%20et%20al%202010%20Photocatalysis%20for%20Water%20Treatment.pdf

• http://www.researchgate.net/profile/Julian_Blanco/publication/223565032_Photocatalytic_treatment_of_water-soluble_pesticides_by_photo-Fenton_and_TiO2_using_solar_energy/links/0f3175365f81da9740000000.pdf

• http://news.panasonic.com/global/stories/2014/30520.html