Photocatalytic mineralization of indoor VOC mixtures over unique ternary TiO2/C/MnO2 with high adsorption selectivity

Wang, Wenjun; Lin, Fawei; An, Taicheng; Qiu, Saixi; Yu, Hongdi; Yan, Beibei; Chen, Guanyi; Hou, Li’an

doi:10.1016/j.cej.2021.131678

Cited by 29 publications

(13 citation statements)

References 52 publications

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“…Besides, positive effects on the mixture of VOCs were reported by Li et al The addition of formaldehyde into toluene turns out to be the rate-determining step in the ring-opening process, which induced the generation of o -tolualdehyde as key intermediates and thus facilitated the activation of aromatic ring, increasing the decomposition reaction rates for the mixture. Similarly, Wang et al synthesized ternary TiO 2 /C/MnO 2 for indoor formaldehyde and toluene mixture mineralization at room temperature under visible light irradiation; formaldehyde with strong adsorption affinity replaced toluene with weak adsorption affinity on the adsorption site and then was mineralized, rapidly avoiding addition reactions and producing potentially toxic and refractory intermediates . In summary, even though photocatalytic technology has been extensively applied for the treatment of a single target component, future research should focus on the degradation of mixed pollutants, and noteworthily, the consideration of actual concentration of pollutant is necessary.…”

Section: Improving the Practical Suitability In Applicationmentioning

confidence: 99%

Optimizing the Gas–Solid Photocatalytic Reactions for Air Purification

Cui

Dong

2022

ACS EST Eng.

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The development of photocatalytic air purification technology is limited by the unsatisfactory performance and low suitability for real industrialization. In this Perspective, the strategy of optimizing the overall reaction processes to enhance photocatalytic performance is discussed. Also, the reaction mechanism and then tuning reaction kinetics are emphasized for guiding the rational design of photocatalysts. Further, we describe the development of humidity-independent, immobilized, and durable photocatalysts for multicomponent pollutants removal to meet the engineering requirements of practical applications. Finally, the outlook and challenges for photocatalytic air purification have been proposed to guide the future work.

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Section: Improving the Practical Suitability In Applicationmentioning

confidence: 99%

Optimizing the Gas–Solid Photocatalytic Reactions for Air Purification

Cui

Dong

2022

ACS EST Eng.

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“…Natural organic matter and zeolite are also popular in synthesizing photocatalyst composites. Wang, W. et al [8] provided a green and sustainable method for synthesizing ternary nano-catalysts. Using natural proteins as carbon sources and templates, they synthesized a ternary nano photocatalyst TiO 2 /C/MnO 2 .…”

Section: Catalystmentioning

confidence: 99%

“…Over the past few decades, several cleaning techniques including ventilation [7], adsorption [8], biological treatment [9], gas separation [10], and chemical oxidation [1] have been proposed for the removal of VOCs, but most of these techniques are limited by their insurmountable shortcomings. For example, ventilation is usually limited by efficiency, time, and outdoor air quality [7]; absorption requires adsorbents with high adsorption capacity and high regeneration ability [11]; biological treatment has high requirements for strain screening and culture; and gas separation and chemical oxidation are difficult to apply in indoor environments due to their high cost and operating conditions [12].…”

Section: Introductionmentioning

confidence: 99%

“…Doping is a relatively simple and effective strategy for the synthesis of efficient photocatalysts. Doping other materials or elements can regulate the band structure of photocatalysts and improve the activity of the photocatalysts [8,22]. Nanotechnology has been widely applied in the synthesis of photocatalysts with high catalytic activity and unique nanostructures, such as nanoparticles [24], nanotubes [25][26][27], nanofibrous mats [28], nanobelts [29], and nanofibers [30].…”

Section: Introductionmentioning

confidence: 99%

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Nano Metal-Containing Photocatalysts for the Removal of Volatile Organic Compounds: Doping, Performance, and Mechanisms

et al. 2022

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Volatile organic compounds (VOCs) in indoor air are considered a major threat to human health and environmental safety. The development of applicable technologies for the removal of VOCs is urgently needed. Nowadays, photocatalytic oxidation (PCO) based on metal-containing photocatalysts has been regarded as a promising method. However, unmodified photocatalysts are generally limited in applications because of the narrow light response range and high recombination rate of photo-generated carriers. As a result, nano metal-containing photocatalysts doped with elements or other materials have attracted much attention from researchers and has developed over the past few decades. In addition, different doping types cause different levels of catalyst performance, and the mechanism for performance improving is also different. However, there are few reviews focusing on this aspect, which is really important for catalyst design and application. This work aims to give a comprehensive overview of nano metal-containing photocatalysts with different doping types for the removal of VOCs in an indoor environment. First, the undoped photocatalysts and the basic mechanism of PCO is introduced. Then, the application of metal doping, non-metal doping, co-doping, and other material doping in synthetic metal-containing photocatalysts are discussed and compared, respectively, and the synthesis methods, removal efficiency, and mechanisms are further investigated. Finally, a development trend for using nano metal-containing photocatalysts for the removal of VOCs in the future is proposed. This work provides a meaningful reference for selecting effective strategies to develop novel photocatalysts for the removal of VOCs in the future.

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“…1 As one of the main pollutants in the indoor environment, formaldehyde, is a colorless and irritating gas, which is easy to volatilize at room temperature. 2,3 Exposure to formaldehyde even as low as 0.3-0.5 ppm over short-term periods of time can cause eyes and nasal passages to be irritated due to formaldehyde. 4 Exposure to formaldehyde at larger than 1 ppm concentration for extended time causes serious health issues, such as lung function decline, liver injury, and other pathologies.…”

Section: Introductionmentioning

confidence: 99%

Excellent room temperature catalytic activity for formaldehyde oxidation on a single-atom iron catalyst in a moist atmosphere

Liu

Zhang

zhang³

et al. 2022

Preprint

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For human safety, efficient removal of formaldehyde in indoor environments is essential. However, removing formaldehyde from indoor environment given the temperature and moisture remains a challenge. In this study, a metal-organic framework-based single-atom iron catalyst (FeSA) is proposed as a candidate catalyst for oxidation of formaldehyde. The optimal structure between different coordination environments of FeSA was screened by density functional theory (DFT) calculation. Guided by the theoretical results, FeSA with 5 nitrogen coordination (FeSA-N5-C) was selected and prepared experimentally for evaluation. The activity tests revealed that the removal efficiency of formaldehyde reached 85.5% at 25°C and 75% relative humidity, which is not possible for traditional catalysts. More importantly, moisture boosts catalytic oxidation of formaldehyde to some extent, illustrating that FeSA-N5-C is robust for practical applications. To our knowledge, this is the first report of single-atom catalyst for catalytic oxidation of formaldehyde, opening up a new avenue for design of high activity and strongly water-resistant catalysts.

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Photocatalytic mineralization of indoor VOC mixtures over unique ternary TiO2/C/MnO2 with high adsorption selectivity

Cited by 29 publications

References 52 publications

Optimizing the Gas–Solid Photocatalytic Reactions for Air Purification

Optimizing the Gas–Solid Photocatalytic Reactions for Air Purification

Nano Metal-Containing Photocatalysts for the Removal of Volatile Organic Compounds: Doping, Performance, and Mechanisms

Excellent room temperature catalytic activity for formaldehyde oxidation on a single-atom iron catalyst in a moist atmosphere

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