As2O3 removal from coal-fired flue gas by the carbon-based adsorbent: Effects of adsorption temperature and flue gas components

Zhao, Shilin; Liao, Yiren; Xie, Xingyu; Wang, Yuchen; Sun, Zhiqiang

doi:10.1016/j.cej.2022.138023

Cited by 22 publications

(10 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The change in the clay layers’ geometry, due to intercalation, involves modification in interlayer spacing, variation in the layers stacking mode, and diminishing of electrostatic forces between clay layers, resulting in great enhancement of the mechanical and thermal properties. The full separation of clay gallery due to polyaniline chains is called exfoliated structure, which is the third type of PANC nanocomposite [ 4 , 6 ]. As noted in the figures, separation of clay layers and formation of PANI inside the clay gallery were achieved.…”

Section: Resultsmentioning

confidence: 99%

“…In previous studies, PANI-specific surface area was varied, depending on the synthesis technique or even the treatment of polyaniline after preparation. It was reported that the BET surface area ranged from 20.2 m 2 /g to 80 m 2 /g [ 6 ]. Hailing Xu et al stated that the total pore volume and the average pore size varied dramatically after PANI treatment with chloroform, alongside the mean pore diameter increasing from 2.8 to 8.3 nm and the pore volume improving from 0.2 to 0.6 cm 3 /g, respectively [ 4 ].…”

Section: Resultsmentioning

confidence: 99%

“…It was noticed that the adsorption capacities varied depending on several factors, mainly the preparation techniques. Recently, PANI and its nanocomposites have been synthesized through several methods and then used as adsorbents for the adsorption of aqueous contaminants, such as Mordant Black 11 dye, methyl red dye, sodium salicylate and metronidazole, and drug contaminants [ 3 , 4 , 5 , 6 ]. Additionally, its electrical and optical properties largely contributed to its utilization in gas sensing applications.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigating the Adsorption Behavior of Polyaniline and Its Clay Nanocomposite towards Ammonia Gas

2022

View full text Add to dashboard Cite

Air pollution and control of gaseous air pollutants are global concerns. Exposure to these gaseous contaminants causes several health risks, especially exposure to irritant gases such as ammonia (NH3). Furthermore, the application of smart polymeric nanocomposites in environmental applications has gained significant interest in recent years. In this study, aniline was polymerized without and with clay using a carbon dioxide (CO2)-assisted polymerization technique, yielding PANI and PANC samples, respectively. The samples were characterized using different methods, such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscope (SEM), and Brunner Emmett Teller (BET). The synthesized nanomaterials were utilized as gas adsorbents using a fixed bed reactor to investigate their adsorption behavior towards NH3. Three inlet NH3 concentrations were tested (35–150 ppm). The results revealed that the adsorption capacities of PANC nanocomposites were higher than nanostructured PANI for the studied concentrations. The adsorption capacities were 61.34 mgNH3/gm for PANC and 73.63 mgNH3/gm for PANI at the same inlet concentration (35 ppm). The highest NH3 adsorption capacity recorded was 582.4 mg NH3/gm, for PANC. This study showed the impressive adsorption behavior of the prepared PANI and PANC nanomaterials towards NH3 gas. Consequently, nanostructured PANI and PANC can be promising adsorbents that can be utilized to control different gaseous air pollutants.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigating the Adsorption Behavior of Polyaniline and Its Clay Nanocomposite towards Ammonia Gas

2022

View full text Add to dashboard Cite

show abstract

“…18,19 Nevertheless, the high cost of activated carbon prompts the exploration of alternative materials such as biomass, which is inexpensive and exhibits similar properties. 20,21 Biomass possesses a welldeveloped pore structure following high-temperature pyrolysis, 22,23 enhancing its ability to adsorb mercury. Chemical impregnation modification of the coke can further enhance the adsorption performance of Hg 0 .…”

Section: Introductionmentioning

confidence: 99%

“…The mercury in coal combustion flue gas exists in three forms: gaseous singlet mercury (Hg 0 ), gaseous oxidized mercury (Hg 2+ ), and particulate mercury (Hg P ). , Hg 0 is particularly challenging to remove due to its volatility and insolubility in water. , Currently, activated carbon is widely used as an adsorbent for mercury removal. , Nevertheless, the high cost of activated carbon prompts the exploration of alternative materials such as biomass, which is inexpensive and exhibits similar properties. , Biomass possesses a well-developed pore structure following high-temperature pyrolysis, , enhancing its ability to adsorb mercury. Chemical impregnation modification of the coke can further enhance the adsorption performance of Hg 0 . , Zeng et al prepared ZnCl 2 -modified activated carbon for the removal of Hg 0 from coal-fired flue gas.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Understanding of the Mechanism of Mercury Removal by Acid–Chlorine-Modified Biomass Coke: Experiments and Simulations

Le,

Wang,

Zeng

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

Coal-fired power plants are a significant source of mercury pollution, necessitating the development of inexpensive and efficient adsorbents for mercury removal. This work proposes the preparation of an adsorbent using acid-chlorine-modified rice straw coke for this purpose. The characterization of the adsorbent shows that the modification increases the surface pore structure and makes the surface carry abundant oxygen-containing functional groups, which is conducive to improving the mercury removal capacity of the adsorbent. This work studies the effects of the acid–chlorine ratio, mass ratio, inlet mercury concentration, and reaction temperature on the desorption performance of modified rice straw coke and investigates the mechanism of mercury removal by combining the kinetic model and density functional theory. The results demonstrate that the optimal effect of the combined acid–chlorine modification is achieved at an acid–chlorine ratio and mass ratio of 1:2. The reaction temperature has a significant effect on the efficiency of mercury removal, and the increase of the inlet mercury concentration can promote mercury removal. The mercury adsorption process is primarily controlled by surface mass transfer and chemisorption, with chemisorption being the critical control step. The introduction of Cl and O atoms through modification creates doped structures that are highly conducive to mercury adsorption. The Cl atom exhibits greater reactivity toward the Hg atom, facilitating the removal of mercury. The presence of O atoms not only increases the abundance of oxygen-containing functional groups on the surface, but also enhances the activity of the Cl atoms. These findings provide valuable theoretical support for the application of biomass coke in the field of mercury removal, addressing mercury pollution associated with coal-fired power plants.

show abstract

Investigation of the Impact of Crystalline Arsenolite Oxide Formations on Porous Gallium Arsenide

Suchikova,

Lysak,

Kovachov

et al. 2024

Physica Status Solidi (a)

View full text Add to dashboard Cite

Herein, the impact of arsenolite oxide (As2O3) crystallites on the structural and optical properties of porous gallium arsenide (GaAs) is examined, focusing on understanding the potential passivation effect and its influence on material stability and safety. Utilizing a comprehensive set of analytical methods, including cathodoluminescence (CL) spectroscopy, Raman scattering spectroscopy, and X‐ray diffraction, the interaction between the GaAs substrate and arsenolite crystallites is characterized. The results indicate that the crystallites do not significantly alter the electronic and optical properties of the underlying GaAs, suggesting a possible passivating effect that could enhance device performance. However, concerns regarding arsenolite's environmental stability and toxicity prompt a cautious approach to its application. Herein, the need for further research into conditions conducive to natural oxide formation, exploration of alternative passivation strategies, and development of safe and stable oxide layers is underscored. Reproducible results are necessary to confirm the differences in CL signals between samples, as the current findings are based on single measurements.

show abstract

As2O3 removal from coal-fired flue gas by the carbon-based adsorbent: Effects of adsorption temperature and flue gas components

Cited by 22 publications

References 32 publications

Investigating the Adsorption Behavior of Polyaniline and Its Clay Nanocomposite towards Ammonia Gas

Investigating the Adsorption Behavior of Polyaniline and Its Clay Nanocomposite towards Ammonia Gas

Multiscale Understanding of the Mechanism of Mercury Removal by Acid–Chlorine-Modified Biomass Coke: Experiments and Simulations

Investigation of the Impact of Crystalline Arsenolite Oxide Formations on Porous Gallium Arsenide

Contact Info

Product

Resources

About