Passive Control of Indoor Formaldehyde by Mixed-Metal Oxide Latex Paints.

Environmental Science & Technology
Busuyi O AdebayoFateme Rezaei

Abstract

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 adsor...Continue Reading

References

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Nov 28, 2012·Environmental Science & Technology·Abdunaser M Ewlad-AhmedLorraine T Gibson
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Jun 4, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Zhihua XuXinyang Li
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Apr 12, 2019·ACS Applied Materials & Interfaces·Anirudh KrishnamurthyFateme Rezaei
Aug 27, 2019·Environmental Research·Kumar VikrantEilhann E Kwon

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