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

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 ppm v , 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 ppm v formaldehyde by up to 60% at 25 °C and 70% RH with an adsorption rate of 0.34 ppm v /h. Overall, this study highlights the potential of MMO-latex paints with optimized formation for the efficient abatement of indoor aldehydes.

Expediting Toluene Combustion by Harmonizing the Ce–O Strength over Co-Doped CeZr Oxide Catalysts

“…4,5 Therefore, there is an urgent need for a technology to effectively control VOC emissions. Catalytic combustion technology with high efficiency and low pollution 6,7 has become an essential approach to control various VOCs such as toluene, 8,9 formaldehyde, 10 propane, 11 benzene, 12 and so forth. Noble metal catalysts exhibit high performance, but expensiveness and scarcity are the limitations of their commercialization.…”

“…Serious global air contamination is one of the main culprits in destroying the environment and endangering human health. − Volatile organic compounds (VOCs) are crucial precursors for the formation of fine particulate matter (PM2.5) and ozone (O 3 ). , Therefore, there is an urgent need for a technology to effectively control VOC emissions. Catalytic combustion technology with high efficiency and low pollution , has become an essential approach to control various VOCs such as toluene, , formaldehyde, propane, benzene, and so forth. Noble metal catalysts exhibit high performance, but expensiveness and scarcity are the limitations of their commercialization .…”

Low-Temperature Combustion of Toluene over Cu-Doped SmMn2O5 Mullite Catalysts via Creating Highly Active Cu2+–O–Mn4+ Sites

“…Atmospheric environmental problems such as haze and photochemical smog are serious threats to the health of the people. − Volatile organic compounds (VOCs) are important precursors that form secondary pollutants such as fine particulate matter (PM2.5) and ozone (O 3 ). , Therefore, it is urgent to develop a technique that can efficiently degrade VOCs. Catalytic combustion has been widely used in the treatment of various VOCs such as formaldehyde, benzene, toluene, chlorobenzene, and so forth because of their characteristics of high efficiency and low secondary pollution. , The core of this technology banks on the development of high-efficiency catalysts. Although noble metal catalysts exhibit the highest activity, high price and rareness have hindered their wide applications .…”

“…4,5 Therefore, it is urgent to develop a technique that can efficiently degrade VOCs. Catalytic combustion has been widely used in the treatment of various VOCs such as formaldehyde, 6 benzene, 7 toluene, 8 chlorobenzene, 9 and so forth because of their characteristics of high efficiency and low secondary pollution. 10,11 The core of this technology banks on the development of high-efficiency catalysts.…”

A curtain purification system based on a rabbit fur-based rotating triboelectric nanogenerator for efficient photocatalytic degradation of volatile organic compounds

“…3 At present, the main methods of indoor formaldehyde treatment include physisorption and photocatalytic oxidation. 4,5 Physisorption has limited absorptivity and produces secondary pollution easily. Alternatively, heterogeneous photocatalysis is a promising technology to remove VOCs and can achieve high efficiency and environmental protection.…”