Effects of properties of minerals adsorbents for the adsorption and desorption of volatile organic compounds (VOC)

Zhang, Guangxin; Feizbakhshan, Mohammad; Zheng, Shuilin; Hashisho, Zaher; Sun, Zhiming; Liu, Yangyu

doi:10.1016/j.clay.2019.02.022

Cited by 58 publications

(19 citation statements)

References 32 publications

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“…Potential explanations for this change include that by removing the organic carbon, sorption sites (usually blocked with organic carbon) were now free and thus more readily available to interact with octane and the polarity of the mineral surfaces may have decreased, which would be more favorable for nonpolar octane to interact with less polar surfaces. 57 Effect of Humidity on Adsorption. Heat of adsorption between octane and quartz sand decreased with humidity (Figure 2), which means that octane interacted less with quartz sand at higher RH.…”

Section: Developed a Modelmentioning

confidence: 99%

Physicochemical Gas–Solid Sorption Properties of Geologic Materials Using Inverse Gas Chromatography

et al. 2021

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The goal of this study was to determine the physicochemical properties of a variety of geologic materials using inverse gas chromatography (IGC) by varying probe gas selection, temperature, carrier gas flow rate, and humidity. This is accomplished by measuring the level of interaction between the materials of interest and known probe gases. Identifying a material’s physicochemical characteristics can help provide a better understanding of the transport of gaseous compounds in different geologic materials or between different geological layers under various conditions. Our research focused on measuring the enthalpy (heat) of adsorption, Henry’s constant, and diffusion coefficients of a suite of geologic materials, including two soil types (sandy clay-loam and loam), quartz sand, salt, and bentonite clay, with various particle sizes. The reproducibility of IGC measurements for geologic materials, which are inherently heterogeneous, was also assessed in comparison to the reproducibility for more homogeneous synthetic materials. This involved determining the variability of physicochemical measurements obtained from different IGC approaches, instruments, and researchers. For the investigated IGC-determined parameters, the need for standardization became apparent, including the need for application-relevant reference materials. The inherent physical and chemical heterogeneities of soil and many geologic materials can make the prediction of sorption properties difficult. Characterizing the properties of individual organic and inorganic components can help elucidate the primary factors influencing sorption interactions in more complex mixtures. This research examined the capabilities and potential challenges of characterizing the gas sorption properties of geologic materials using IGC.

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Section: Developed a Modelmentioning

confidence: 99%

Physicochemical Gas–Solid Sorption Properties of Geologic Materials Using Inverse Gas Chromatography

et al. 2021

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“…(1) Preparation method of the hydrophobic aerogel 1 Preparing a diluent of TEOS (the molar ratio of TEOS, ethyl alcohol, and deionized water was TEOS:ETOH:H 2 O = 1:4:4); adjusting the pH value by using 0.1 mol/L hydrochloric acid to 1-2; and then the hydrogel was prepared. 2 Placing and stirring the hydrogel in a water bath with the temperature of 60 • C for 2 h, adjusting the pH value by ammonia water (25 wt%) to 3-7 for gelling, and then putting it into the aging solution (TEOS:ETOH:NH 4 OH = 1:1:1 in volume ratio) for 24 h. 3 Placing the gel into the n-hexane solution with the temperature of 60 • C for 24 h. 4 Then, placing the gel into the hydrophobic modification liquid (TMCS:n-hexane = 1:4 in volume ratio) with the temperature of 60 • C for 12 h. 5 Washing the gel 3 times with the n-hexane solution, drying it at 150 • C for 2 h, and then the hydrophobic aerogel can be obtained. (2) Preparation of carbon-silica composites materials Activated carbon powder (the dosage was 2% or 4% to the mass of the hydrogel) with the diameter of about 75 µm was added into the hydrogel (between step 1 and step 2 in the process of hydrophobic aerogel preparation), keeping the other steps unchanged, and the carbon-silica composites adsorbent can be obtained.…”

Section: Preparation Of Carbon-silica Compositesmentioning

confidence: 99%

“…4 Closing all the valves when the mass of gasoline in the retainer does not change and waiting for the full evaporation of gasoline and making full contact between oil vapor and adsorbent. 5 Measuring the mass of the weighing bottle (its mass recorded as m 3 ) after 10 h. The adsorption rate of hydrophobic aerogel to oil vapor can be calculated by the formula [3]:…”

Section: Static Adsorption Testsmentioning

confidence: 99%

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Preparation of Nano-Porous Carbon-Silica Composites and Its Adsorption Capacity to Volatile Organic Compounds

Zhu

Huang

et al. 2020

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Carbon-silica composites with nanoporous structures were synthesized for the adsorption of volatile organic compounds (VOCs), taking tetraethyl orthosilicate (TEOS) as the silicon source and activated carbon powder as the carbon source. The preparation conditions were as follows: the pH of the reaction system was 5.5, the hydrophobic modification time was 50 h, and the dosage of activated carbon was 2 wt%. Infrared spectrum analysis showed that the activated carbon was dispersed in the pores of aerogel to form the carbon-silica composites material. The static adsorption experiments, dynamic adsorption-desorption experiments, and regeneration experiments show that the prepared carbon-silica composites have microporous and mesoporous structures, the adsorption capacity for n-hexane is better than that of conventional hydrophobic silica gel, and the desorption performance is better than that of activated carbon. It still has a high retention rate of adsorption capacity after multiple adsorption-desorption cycles. The prepared carbon-silica composites material has good industrial application prospects in oil vapor recovery, providing a new alternative for solving organic waste gas pollution.

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“…Among all, the EU Council Directive 1999/13/EC (and successive amendments and corrections) indicates as a VOC “any organic compound having at 20 °C a vapor pressure of 0.01 kPa or more or having a corresponding volatility under the particular conditions of use” [ 3 ]. Additionally, the quite dated—although still highly cited in the literature [ 4 ]—1989 World Health Organization’s (WHO) definition classifies as a VOC any organic chemical having a boiling point up to 250 °C measured at a standard atmospheric pressure of 101.3 kPa. Based on this definition, the WHO subdivided VOCs into different classes: very volatile organic compounds, VVOCs, having boiling points ranging from <0 °C to 50–100 °C, such as propane (C 3 H 8 ), butane (C 4 H 10 ), methyl chloride (CH 3 Cl); and volatile organic compounds, VOCs, with boiling points in the range from 50–100 °C to 240–260 °C, including substances such as formaldehyde (CH 2 O), limonene (C 10 H 16 ), and ethanol (C 2 H 5 OH).…”

Section: Introductionmentioning

confidence: 99%

Paving the Way for a Green Transition in the Design of Sensors and Biosensors for the Detection of Volatile Organic Compounds (VOCs)

et al. 2022

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The efficient and selective detection of volatile organic compounds (VOCs) provides key information for various purposes ranging from the toxicological analysis of indoor/outdoor environments to the diagnosis of diseases or to the investigation of biological processes. In the last decade, different sensors and biosensors providing reliable, rapid, and economic responses in the detection of VOCs have been successfully conceived and applied in numerous practical cases; however, the global necessity of a sustainable development, has driven the design of devices for the detection of VOCs to greener methods. In this review, the most recent and innovative VOC sensors and biosensors with sustainable features are presented. The sensors are grouped into three of the main industrial sectors of daily life, including environmental analysis, highly important for toxicity issues, food packaging tools, especially aimed at avoiding the spoilage of meat and fish, and the diagnosis of diseases, crucial for the early detection of relevant pathological conditions such as cancer and diabetes. The research outcomes presented in the review underly the necessity of preparing sensors with higher efficiency, lower detection limits, improved selectivity, and enhanced sustainable characteristics to fully address the sustainable manufacturing of VOC sensors and biosensors.

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Effects of properties of minerals adsorbents for the adsorption and desorption of volatile organic compounds (VOC)

Cited by 58 publications

References 32 publications

Physicochemical Gas–Solid Sorption Properties of Geologic Materials Using Inverse Gas Chromatography

Physicochemical Gas–Solid Sorption Properties of Geologic Materials Using Inverse Gas Chromatography

Preparation of Nano-Porous Carbon-Silica Composites and Its Adsorption Capacity to Volatile Organic Compounds

Paving the Way for a Green Transition in the Design of Sensors and Biosensors for the Detection of Volatile Organic Compounds (VOCs)

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