{"id":2187,"date":"2025-09-10T23:55:11","date_gmt":"2025-09-10T14:55:11","guid":{"rendered":"https:\/\/www.palccoat.com\/en\/?p=2187"},"modified":"2025-12-16T17:15:44","modified_gmt":"2025-12-16T08:15:44","slug":"250910","status":"publish","type":"post","link":"https:\/\/www.palccoat.com\/en\/news\/250910\/","title":{"rendered":"Indoor Air Quality (IAQ) and Photocatalysis"},"content":{"rendered":"<h3>\u2014 Research Trends in the Academic Field and Perspectives Required in Real-World Environments \u2014<\/h3>\r\n\r\n<p>\r\nIn recent years, particularly in the fields of architecture and environmental engineering,\r\ninterest in <b>Indoor Air Quality (IAQ)<\/b> has been growing worldwide.\r\n<\/p>\r\n\r\n<p>\r\nWhile energy efficiency, airtightness, and high insulation performance in buildings have advanced,\r\nchemical substances and volatile organic compounds (VOCs) that accumulate indoors\r\nare once again being recognized as potential health risks.\r\n<\/p>\r\n\r\n<hr>\r\n\r\n<h4>The Core of IAQ Research: \u201cVentilation + Materials + Chemical Substances\u201d<\/h4>\r\n\r\n<p>\r\nIn academic IAQ research, rather than relying on a single countermeasure,\r\n<\/p>\r\n\r\n<ul>\r\n  <li>\u25cfVentilation design<\/li>\r\n  <li>\u25cfEmissions from building and interior materials<\/li>\r\n  <li>\u25cfChemical reactions occurring indoors<\/li>\r\n<\/ul>\r\n\r\n<p>\r\na <b>comprehensive and integrated perspective<\/b> has become the mainstream approach.\r\n<\/p>\r\n\r\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.palccoat.com\/en\/wp-content\/uploads\/img_postnew_250910a.jpg\" alt=\"Indoor cross-sectional diagram\" width=\"1600\" height=\"710\" class=\"alignnone size-full wp-image-3151\" \/>\r\n\r\n<p>\r\nParticular attention is being paid to substances such as:\r\n<\/p>\r\n\r\n<ul>\r\n  <li>\u25cfFormaldehyde<\/li>\r\n  <li>\u25cfTVOC (Total Volatile Organic Compounds)<\/li>\r\n<\/ul>\r\n\r\n<p>\r\nwhich are known to pose risks even at low concentrations when exposure occurs over long periods.\r\n<\/p>\r\n\r\n<hr>\r\n\r\n<h4>Photocatalysts in IAQ Research as a \u201cComplementary Technology\u201d<\/h4>\r\n\r\n<p>\r\nWithin the IAQ research field, photocatalysts are not treated as a \u201cuniversal air purification solution,\u201d\r\nbut are instead positioned as:\r\n<\/p>\r\n\r\n<ul>\r\n  <li>\u25cfA supplementary measure that assumes proper ventilation<\/li>\r\n  <li>\u25cfA surface-based reaction control technology for building materials<\/li>\r\n<\/ul>\r\n\r\n<p>\r\nThis perspective is widely accepted in academic discussions.\r\n<\/p>\r\n\r\n<p>\r\nRecent studies have focused on:\r\n<\/p>\r\n\r\n<ul>\r\n  <li>\u25cfReactivity under low-light indoor conditions<\/li>\r\n  <li>\u25cfDurability and longevity of photocatalytic coatings formed on surfaces<\/li>\r\n  <li>\u25cfThe presence or absence of by-products<\/li>\r\n<\/ul>\r\n\r\n<p>\r\nThese aspects are being examined in greater detail.\r\n<\/p>\r\n\r\n<hr>\r\n\r\n<h4>Academic Clarification of the Term \u201cDecomposition\u201d<\/h4>\r\n\r\n<p>\r\nEven in IAQ research, photocatalytic reactions are not regarded as simple \u201cdecomposition,\u201d\r\nbut rather as a <b>continuous series of oxidation reactions<\/b>.\r\n<\/p>\r\n\r\n<p>\r\nAs a result, careful discussion is given to:\r\n<\/p>\r\n\r\n<ul>\r\n  <li>\u25cfIntermediate products generated during the reaction process<\/li>\r\n  <li>\u25cfThe potential for re-emission within indoor spaces<\/li>\r\n<\/ul>\r\n\r\n<p>\r\nFor this reason, avoiding overly simplified expressions of photocatalytic effects\r\nis considered important from an academic standpoint.\r\n<\/p>\r\n\r\n<hr>\r\n\r\n<h4>\u201cDurability\u201d and \u201cManagement\u201d in Indoor Environments<\/h4>\r\n\r\n<p>\r\nIn the IAQ field, greater emphasis is placed on long-term performance rather than short-term effects, including:\r\n<\/p>\r\n\r\n<ul>\r\n  <li>\u25cfWhether performance can be maintained over extended periods<\/li>\r\n  <li>\u25cfDeactivation caused by the accumulation of indoor pollutants<\/li>\r\n  <li>\u25cfThe relationship with cleaning and maintenance practices<\/li>\r\n<\/ul>\r\n\r\n<p>\r\nSuch <b>operational and management perspectives<\/b> are considered essential.\r\n<\/p>\r\n\r\n<p>\r\nThe lifespan and effectiveness of photocatalytic coatings vary depending on usage conditions\r\nand the surrounding indoor environment, making it difficult to define them with a single uniform value.\r\n<\/p>\r\n\r\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.palccoat.com\/en\/wp-content\/uploads\/img_postnew_250910d.jpg\" alt=\"PALCCOAT interior coating\" width=\"1600\" height=\"926\" class=\"alignnone size-full wp-image-3162\" \/>\r\n\r\n[Above image: Sick house countermeasures using<a href=\"https:\/\/www.palccoat.com\/en\/wp-content\/uploads\/palccoat_vlag_piaj_certification_en.pdf\" title=\"Specifications of PALCCOAT VLAG\">&nbsp;PALCCOAT VLAG&nbsp;<\/a>coating]\r\n\r\n<hr>\r\n\r\n<h4>Approaches to Performance Evaluation and Measurement<\/h4>\r\n\r\n<p>\r\nIn IAQ research, it is pointed out that evaluations should clearly distinguish between:\r\n<\/p>\r\n\r\n<ul>\r\n  <li>\u25cfLaboratory-based testing<\/li>\r\n  <li>\u25cfMeasurements conducted in actual living environments<\/li>\r\n<\/ul>\r\n\r\n<p>\r\nThis distinction is considered essential.\r\n<\/p>\r\n\r\n<p>\r\nIn real-world environments, numerous factors influence results, including:\r\n<\/p>\r\n\r\n<ul>\r\n  <li>\u25cfTemperature and humidity<\/li>\r\n  <li>\u25cfVentilation frequency<\/li>\r\n  <li>\u25cfHuman occupancy and movement<\/li>\r\n<\/ul>\r\n\r\n<p>\r\nTherefore, careful interpretation of measurement results is required.\r\n<\/p>\r\n\r\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.palccoat.com\/en\/wp-content\/uploads\/img_postnew_250910c.jpg\" alt=\"VOC detector\" width=\"1600\" height=\"663\" class=\"alignnone size-full wp-image-3157\" \/>\r\n\r\n<hr>\r\n\r\n<h4>PALCCOAT\u2019s Perspective on IAQ<\/h4>\r\n\r\n<p>\r\nWhen applying photocatalytic technology as an IAQ countermeasure, PALCCOAT adheres to the following principles:\r\n<\/p>\r\n\r\n<ul>\r\n  <li>\u25cfConsidering the overall design of the indoor environment as a prerequisite<\/li>\r\n  <li>\u25cfPositioning photocatalysts as a complementary technology<\/li>\r\n  <li>\u25cfAvoiding excessive emphasis or exaggeration of measurement results<\/li>\r\n<\/ul>\r\n\r\n<p>\r\nThese principles form the foundation of our approach.\r\n<\/p>\r\n\r\n<p>\r\nImproving indoor air quality is not an issue that can be resolved by a single technology alone;\r\nit should be addressed as a challenge that requires the <b>combination of multiple elements<\/b>.\r\n<\/p>\r\n\r\n<p>\r\nPALCCOAT will continue to share information that bridges academic knowledge\r\nwith real-world application, construction, and operational practices related to IAQ.\r\n<\/p>\r\n\r\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.palccoat.com\/en\/wp-content\/uploads\/img_postnew_250910b.jpg\" alt=\"PALCCOAT formaldehyde air purification test\" width=\"1600\" height=\"926\" class=\"alignnone size-full wp-image-3152\" \/>\r\n\r\n[Left graph: Formaldehyde air purification performance of PALCCOAT under real-environment conditions (JIS test)]\r\n\r\n<div style=\"border: 1px solid #ddd; padding: 20px; border-radius: 8px; margin: 40px 0; background: #f9f9f9;\">\r\n<p style=\"margin: 0 0 12px 0; font-weight: 600;\">\r\nFor detailed specifications of PALCCOAT or inquiries regarding implementation,\r\nplease feel free to contact us using the form below.\r\n<\/p>\r\n<a href=\"\/contact\/\" style=\"color: #004e98; font-weight: 600; text-decoration: underline;\">\r\nContact form\r\n<\/a>\r\n<\/div>\r\n","protected":false},"excerpt":{"rendered":"\u2014 Research Trends in the Academic Field and Perspectives Required in Real-World Environments \u2014 In recent years, particularly in the fields of architecture and environmental engineering, interest in Indoor Air Quality (IAQ) has been growing worldwide. While energy efficiency, airtightness, and high insulation performance in buildings have advanced, chemical substances and volatile organic compounds (VOCs) that accumulate indoors are once again being recognized as potential health risks. The Core of IAQ Research: \u201cVentilation + Materials + Chemical Substances\u201d In academic IAQ research, rather than relying on a single countermeasure, \u25cfVentilation design \u25cfEmissions from building and interior materials \u25cfChemical reactions occurring indoors a comprehensive and integrated perspective has become the mainstream ...","protected":false},"author":3,"featured_media":2189,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[16,22,24,250,251,252,253,254,255,256,257],"class_list":["post-2187","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-photocatalyst","tag-voc","tag-formaldehyde","tag-indoorairquality","tag-iaq","tag-indoorenvironment","tag-buildingscience","tag-environmentalengineering","tag-sickbuildingsyndrome","tag-healthybuildings","tag-tvoc"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.palccoat.com\/en\/wp-json\/wp\/v2\/posts\/2187","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.palccoat.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.palccoat.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.palccoat.com\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.palccoat.com\/en\/wp-json\/wp\/v2\/comments?post=2187"}],"version-history":[{"count":4,"href":"https:\/\/www.palccoat.com\/en\/wp-json\/wp\/v2\/posts\/2187\/revisions"}],"predecessor-version":[{"id":2195,"href":"https:\/\/www.palccoat.com\/en\/wp-json\/wp\/v2\/posts\/2187\/revisions\/2195"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.palccoat.com\/en\/wp-json\/wp\/v2\/media\/2189"}],"wp:attachment":[{"href":"https:\/\/www.palccoat.com\/en\/wp-json\/wp\/v2\/media?parent=2187"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.palccoat.com\/en\/wp-json\/wp\/v2\/categories?post=2187"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.palccoat.com\/en\/wp-json\/wp\/v2\/tags?post=2187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}