Passive Control of Indoor Formaldehyde by Mixed-Metal Oxide Latex Paints
| Autor: | Qasim Al-Naddaf, Ali A. Rownaghi, Fateme Rezaei, Jacob G. Trautman, Busuyi O. Adebayo |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Latex Mixed metal Indoor air Drop (liquid) Formaldehyde Oxide Oxides General Chemistry 010501 environmental sciences 01 natural sciences humanities Passive control chemistry.chemical_compound Adsorption chemistry Air Pollution Indoor Paint Environmental Chemistry Relative humidity 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | Environmental Science & Technology. 55:9255-9265 |
| ISSN: | 1520-5851 0013-936X |
| Popis: | This work reports the incorporation of mixed-metal oxides (MMOs) such as Si/Ti and Si/Zr into latex paints in the form of thin coatings for permanent trapping of indoor formaldehyde. The formaldehyde removal performance of the surface coatings was evaluated in a lab-scale indoor air chamber, and the results were compared with those of powder analogues. Due to the pore blockage by the latex, the incorporation led to 6-30% reduction in adsorption capacity and 50-70% drop in the adsorption rate for MMO-latex paints relative to their powder MMO analogues. Under the operating conditions of concentration, temperature, and relative humidity, the Si/Zr-latex paints outperformed the Si/Ti counterparts. It was also observed that performance could decrease over excessive loading, for example, Si/Zr-latex paint with 15/1 Si/Zr weight ratio showed a 20% lower adsorption capacity than that of the Si/Zr-latex paint with 25/1 Si/Zr ratio at 5 ppmv, 25 °C, and 70% RH. While high temperature greatly reduced the adsorption rate of the MMO-latex paints, high humidity slightly promoted the rate of formaldehyde capture. In 10 L, flow-through chamber tests, 25Si/Zr-latex paint reduced 5 ppmv formaldehyde by up to 60% at 25 °C and 70% RH with an adsorption rate of 0.34 ppmv/h. Overall, this study highlights the potential of MMO-latex paints with optimized formation for the efficient abatement of indoor aldehydes. |
| Databáze: | OpenAIRE |
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