With the rapid development of industry, the environment has become the first "victim". The most serious problems are air quality and water resource pollution. Water quality can be filtered and purified through water supply plants, but we always need air, and what can we do to solve this? The deterioration of air has led to the emergence of a new industry in home appliances - air purifiers.
  In some severely polluted cities, such as Beijing and Guangzhou, the problem of air pollution is constantly worsening. Air purifiers have become a standard item in many households. Outdoor air pollution not only affects people's travel and outdoor activities, but also has the same impact on indoor air quality. Regarding outdoor air pollution, we can only protect our health by minimizing travel or wearing professional-level breathing filter masks. As for indoor air pollution, we can more actively eliminate the pollution and create clean air. According to scientific calculations, humans spend 80% of their time in indoor environments. The quality of indoor air directly affects human health and work efficiency.
  It is reported that the pollutants in the air mainly include particulate matter pollution, gaseous chemical pollution (such as formaldehyde, benzene, etc.), and microbial pollution. Different purification technologies are suitable for removing different pollutants. For example, high-efficiency air filters HEPA and electrostatic technology are suitable for removing particulate matter, while activated carbon, catalytic technology, etc. are suitable for removing gaseous pollutants. Microorganisms and particulate matter have certain similarities, and their removal also applies to ozone, ultraviolet light, etc. technologies.
  Air purifiers usually have a pre-filter layer to filter out large particles of dust and debris, with a diameter usually above 100 microns (i.e., PM100). The subsequent filter layers are respectively responsible for removing mold and dust and filtering smaller diameter fine particles (such as PM2.5). The effective air purifier's filter layer usually has an activated carbon layer to remove odors, remove formaldehyde, and adsorb various volatile organic compounds, and can purify relatively clean air.
  When an air purifier purifies indoor air, it uses its own fan or an external fan to make the indoor air continuously pass through the air purifier. The turbid air passes through the purification module and is gradually removed of toxic gases and particles by technologies such as activated carbon nets, high-voltage electrostatics, and photocatalysis. Finally, the clean air is sent out through the outlet.
  Air purifiers are classified according to purification technology into physical adsorption, high-voltage electric field, photocatalysis, chemical complexation, negative ions, etc. Physical adsorption is usually achieved by installing activated carbon nets, adsorbing toxic substances, and the adsorption capacity is related to the density of the activated carbon nets; high-voltage electric field is achieved by high-voltage discharge to ionize the particles passing through the electric field and make them charged, and then remove the particles through the movement of charges; photocatalysis uses TiO2 at normal temperature or under ultraviolet light irradiation to catalyze the oxidation of harmful gases into harmless gases, then clean the air; chemical complexation uses chemical complexation reactions to make harmful gases react with complexing agents to form harmless products, achieving the purpose of purifying the air; negative ions can react with small particles or gas molecules carrying positive ions in the air to eliminate odors and provide fresh air similar to nature's "microclimate environment".
  When an air purifier purifies indoor air, it uses its own fan or an external fan to make the indoor air continuously pass through the air purifier, and the turbid air passes through the purification module, and is gradually removed of toxic gases and particles by technologies such as activated carbon nets, high-voltage electrostatics, and photocatalysis. Finally, the clean air is sent out through the outlet.
  With the development of industrialization, environmental pollution is inevitable. Even though we cannot control the source of pollution, we can solve the serious problem of severe air pollution by controlling the pollution source. Water purifiers will become a must-have commodity in the home appliance industry.

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