Photocatalytic Oxidation

I’m going to discuss the different types of air purifier technology and which types are best for removing particular air pollutants. There are three main categories of pollutants that you need to be concerned with:
  1. Gaseous pollutants or volatile organic compounds (VOCs)
  2. Bacteria and viruses.
  3. Particulate matter
These three need very different purification technologies. However, various technologies are often combined together in one air purifier model in order to increase its effectiveness in removing the full range of pollutants. Let’s look at each of these in turn. Types Of Air Purifier For Gaseous Pollutants or Volatile Organic Compounds Let’s take the gaseous pollutants or volatile organic compounds (VOCs) which are given off by various household furnishings and carpets and by various appliances and equipment. These can particularly affect people with asthma or multiple chemical sensitivities. There are two effective types of air purifier to remove these from the air: Activated Carbon Filters The best way to get rid of these is by a process called ¬†adsorption which is done by activated carbon filters. Sometimes, potassium permanganate and/or zeolite is added to the carbon for a better effect. For these filters, the more surface area of carbon, which means the heavier they are, the more they can adsorb. Photocatalytic Oxidation (PCO) A recent innovation to get rid of VOCs and also to kill bacteria and viruses is called photocatalytic oxidation. It uses ultra-violet light and a photocatalyst (usually titanium dioxide) to produce oxidants that destroy gaseous pollutants and oxidize bacteria and viru  

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