Modeling VOCs emission/sorption with variable operating parameters and general boundary conditions

Deng, Baoqing; Zhang, Haiyan; Wu, Jiming

doi:10.1016/j.envpol.2020.116315

Cited by 8 publications

(5 citation statements)

References 39 publications

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“…Due to the harm of VOCs to the environment and human body, all countries in the world have formulated relevant laws and regulations on the emission of VOCs and minimize or even eliminate the emission of VOCs [4]. Although it is possible to transform the production process and process, improve the production equipment, so that it can achieve zero emissions in the production process.…”

Section: Literature Reviewmentioning

confidence: 99%

The Adsorption of VOCs by Honeycomb Ceramics Loaded with Molecular Sieves

Zhang

2022

Journal of Chemistry

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In order to improve the adsorption performance of molecular sieve honeycomb ceramics for VOCs, the author proposes a research method for the adsorption performance of VOCs based on the honeycomb ceramics loaded with molecular sieves. The method prepared cordierite honeycomb ceramic-supported HY, Na Y, USY, ZSM-5-300, and ZSM-5-360 monolithic adsorption materials by the coating method. Using toluene, ethyl acetate, isopropanol, and acetone as adsorbates, the adsorption properties of single-component and mixed-component organic compounds on the supported molecular sieve honeycomb ceramics were investigated. The result shows ZSM-5-300 has the largest adsorption capacity for the four adsorbates, which are toluene 68.0 mg/g, ethyl acetate 118.7 mg/g, isopropanol 70.9 mg/g, and acetone 72.5 mg/g. The test results show that ZSM-5-300 molecular sieve has high saturated adsorption capacity and is an ideal VOCs adsorption material.

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Section: Literature Reviewmentioning

confidence: 99%

The Adsorption of VOCs by Honeycomb Ceramics Loaded with Molecular Sieves

Zhang

2022

Journal of Chemistry

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“…10 The model was later extended to describe VOC or SVOC emissions in more sophisticated scenarios, for example, emissions from aged materials 11 and multilayer materials with interlayer diffusion 12 and internal chemical reactions, 13 bidirectional emissions from double surfaces, 14 and under the influence of airborne particles 15 and periodical ventilation. 16 These studies, however, have primarily focused on flat emission sources with simple structures, such as particleboard and vinyl or polyvinyl chloride flooring.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Little et al established the first mass transfer model for diffusion-controlled one-dimensional VOC emissions from homogeneous polymers, which was generalized by considering convective mass transfer in the boundary layer and chamber surface sorption . The model was later extended to describe VOC or SVOC emissions in more sophisticated scenarios, for example, emissions from aged materials and multilayer materials with interlayer diffusion and internal chemical reactions, bidirectional emissions from double surfaces, and under the influence of airborne particles and periodical ventilation . These studies, however, have primarily focused on flat emission sources with simple structures, such as particleboard and vinyl or polyvinyl chloride flooring.…”

Section: Introductionmentioning

confidence: 99%

Emissions of Liquid Crystal Monomers from Obsolete Smartphone Screens in Indoor Settings: Characteristics and Human Exposure Risk

Feng

Sun

Zeng

2022

Environ. Sci. Technol.

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Liquid crystal monomers (LCMs) have been found to accumulate in indoor environments, but the emission kinetics of LCMs from electronic devices are not well understood. Leakage from damaged liquid crystal displays may be an important mechanism for LCMs to enter the environment and become potential health hazards to humans. To address this issue, we conducted chamber experiments to characterize the emissions of LCMs from obsolete smartphone screens and estimated the doses of residential and occupational exposures to LCMs. The emission rates of the detected LCMs were in the ranges of 0.1–7 μg m–2 h–1 at 80 °C, 0.05–7 μg m–2 h–1 at 60 °C, and 0.002–0.2 μg m–2 h–1 at 25 °C. Liquid crystal monomers with large molecular weights and low volatilities tended to accumulate at screen surfaces and were re-emitted at elevated temperatures, leading to high emission rates of heavy LCMs upon thermal treatment. The estimated doses of residential and occupational exposures to individual LCMs were 0.0001–0.009 and 0.007–2 ng kg–1 d–1, respectively. As LCMs are potentially carcinogenic based on in silico assessments, LCMs emitted from obsolete smartphones in indoor settings may become human health hazards.

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“…18 Although a few studies have been performed on the initial and boundary conditions of the fibrous porous material, there are still some general porous material discussions. 20–22 All the results show that the boundary and initial conditions significantly impact the mass transfer inside the porous media. Zhu has Engineered Water Nanostructures (EWNS) that take advantage of the Reactive Oxygen Species (ROS, which are made up of hydroxyl and superoxide radicals), to remove odors produced by smoking, cooking, and sweating.…”

Section: Introductionmentioning

confidence: 97%

Tobacco and Hot Pot Odor Adsorbed by Cotton, Wool, and Polyester Fabrics: Desorption Components and Dynamic Analysis

Huang

Liang

Zhang

et al. 2022

AATCC Journal of Research

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Fibrous textiles readily absorb and desorb ambient odors. However, information on the composition and dynamic analysis of tobacco smoke and hot pot odors on fabrics during desorption is limited. This study used gas chromatography–mass spectrometry to analyze the desorption components of cotton, wool, and polyester fabrics exposed to these two odors, respectively. Then, a dynamic diffusion fabric structure model demonstrated the effect of airflow velocity and fabric porosity on nicotine desorption. Furthermore, we proposed mass diffusion coefficients with different molecular weights. The results showed that cotton fabrics with tobacco smoke released many low molecular weight compounds, while with wool fabrics significantly fewer compounds were detected than for the other two fabrics. Notably, 3-ethenylpyridine, a marker of tobacco smoke, was not detected in wool fabrics. For hot pot odor, cotton fabrics released more hexanal, nonanal, and anethole than wool and polyester, while wool fabrics released many β-pinenes. The numerical results of the dynamic model showed that the air inlet velocity significantly affects the nicotine concentration in the fabric. Meanwhile, the concentration of nicotine in fabrics with lower porosity decreased faster. A lower mass diffusion coefficient will cause odors to remain in the fabric. This study aimed at the composition and the dynamics of odor in fabrics and offers essential information and simple models for reducing unnecessary washing of textiles and odor resistance textile design.

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Modeling VOCs emission/sorption with variable operating parameters and general boundary conditions

Cited by 8 publications

References 39 publications

The Adsorption of VOCs by Honeycomb Ceramics Loaded with Molecular Sieves

The Adsorption of VOCs by Honeycomb Ceramics Loaded with Molecular Sieves

Emissions of Liquid Crystal Monomers from Obsolete Smartphone Screens in Indoor Settings: Characteristics and Human Exposure Risk

Tobacco and Hot Pot Odor Adsorbed by Cotton, Wool, and Polyester Fabrics: Desorption Components and Dynamic Analysis

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