Preparation of Carbon-Alumina (C/Al2O3) aerogel nanocomposite for benzene adsorption from flow gas in fixed bed reactor

Rastegar, Ayoob; Farzadkia, Mahdi; Jafari, Ahmad Jonoidi; Esrafili, Ali

doi:10.1016/j.mex.2019.10.019

Cited by 8 publications

(4 citation statements)

References 30 publications

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“…The best porous character with highly distributed SDS-alumina spots is obtained at low dopant ratio and autoclave heating conditions (CNT-Al-0.5 autoclave) (Figure A–C). The formation of the mixed aluminum/carbon-based composites was reported by Maity et al and Rastegar et al to combine the advantages of carbon materials and SDS-alumina and improve the adsorption performance. The results obtained in this work confirm the improvement of the adsorption capacity for the removal of arsenic and mercury in the autoclave heating condition (Table ).…”

Section: Resultsmentioning

confidence: 99%

Influence of Synthesis-Heating Conditions on the Porosity and Performance of a Carbon Nanotube/SDS-Alumina Nanocomposite for Effective Wastewater Treatment: Fabrication, Characterization, and Adsorption Modeling

Habila,

ALOthman,

Hakami

et al. 2023

Ind. Eng. Chem. Res.

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Wastewater treatment for the removal of heavy metals can reduce environmental contamination, enable safer industrial activities, and enhance sustainable practices. Efficient materials processing oriented to low temperature operating conditions; thus, the development and modeling of carbon nanotube/SDS-alumina nanocomposite-based adsorbents (CNT/ SDS-alumina) for efficient wastewater treatment are investigated in this work. The optimization of a low temperature-based process is targeted in this work to achieve a cost-effective method for fabrication of CNT/SDSalumina nanocomposites. The fabrication process involves the investigation of various heating conditions in an oven and autoclave with successful optimization for the formation of porous CNT/SDS-alumina nanocomposite-based adsorbents. The fabricated materials were characterized by TEM, SEM, XRD, FTIR, and surface area analysis. The results indicate that the heating condition is the factor controlling the formation of the porous structure of the CNT/SDS-alumina nanocomposite, which affects the wastewater treatment application. The surface area was higher (49.26−51.02 cm 2 /g) for CNT/SDS-alumina nanocomposite-based adsorbents prepared under autoclave heating conditions. The best adsorption capacity values obtained using the CNT/SDS-alumina nanocomposite prepared under autoclave conditions were 463 mg/g for arsenic ions and 418 mg/g for mercury ions, revealing the high efficiency of the prepared materials for the adsorption of pollutants. The adsorption process for the removal of arsenic and mercury is reported to follow the second-order kinetic model. The adsorption data for the CNT/SDS-alumina nanocomposite-based adsorbents prepared under autoclave heating conditions are well fitted with the Langmuir isotherm, suggesting a monolayer adsorption mechanism. Additionally, the prepared CNT/SDS-alumina nanocomposite-based adsorbents are recommended for potential applications involving the adsorption of various heavy metals for real wastewater treatment situations.

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Section: Resultsmentioning

confidence: 99%

Influence of Synthesis-Heating Conditions on the Porosity and Performance of a Carbon Nanotube/SDS-Alumina Nanocomposite for Effective Wastewater Treatment: Fabrication, Characterization, and Adsorption Modeling

Habila,

ALOthman,

Hakami

et al. 2023

Ind. Eng. Chem. Res.

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“…Among these substances, benzene is a carcinogenic compound which is really harmful to human health, and long-period exposure to it has destructive effects on the immune system, the respiratory organs, and the lymph glands [5]. Therefore, emission control and removal of benzene from vapors before releasing to the atmosphere are very important [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in the light of exploring more useful adsorbents, the constructing of carbon aerogel as adsorbent have been extensively investigated owing to their unique properties including high surface area, low density, high selectivity, and easy recovery [10]. In ddition, absorption capacity of these aerogels does not change even after a long period of time and conducting many adsorptions/desorption cycles [6,11], so that previous studies have reported that the absorption capacities of typical carbon aerogels are usually higher than those of granulated active carbon, against the same pollutants [12,13]. In this regard, carbon aerogels are usually prepared by monomers such as resorcinol, formaldehyde and furfuran, in a suitable solvent [14].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, to overcome these weaknesses, some researchers have reported that Novolac is a suitable alternative precursor [16], being a low-price commercial resin with high charyield efficiency. Indeed, following a drying stage by atmospheric pressure drying (APD) technique, pyrolysis of Novolac-containing aerogels leads to the formation of carbon aerogels with significant properties [6]. Nevertheless, the use of APD process for drying aerogels results in decreased specific surface area and micro porosity [17].…”

Section: Introductionmentioning

confidence: 99%

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Use of NH4Cl for activation of carbon xerogel to prepare a novel efficacious adsorbent for benzene removal from contaminated air streams in a fixed-bed column

Rastegar

Gholami

Jafari

et al. 2020

J Environ Health Sci Engineer

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Background Ammonium chloride as an explosive salt has proved to be a prominent activation agent for adsorbents and increase the specific surface area and volume of cavities. In this work, the ability of this substance was scrutinized for activation of carbon aerogel to prepare an efficient adsorbent for benzene removal from air streams. Methods A carbon xerogel was fabricated from Novallac polymer and activated by ammonium chloride.The changes in structure and morphology were considered via Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), Barrett-Joyner-Halenda (BJH), and energy dispersive X-ray (EDX) analyses. Also, comprehensive studies were conducted to vouchsafe the properties of the new adsorbent for benzene removal, using a fixed-bed column mode. Results The results showed both the successful synthesis and the suitability of the activation process. ACX possessed a higher specific surface area (1008 g/m3), compared to the parent carbon xerogel (CX; 543.7 g/m3) and organic xerogel (OX; 47 g/m3), as well as a higher adsorption capacity. Conclusion NH4CL is a very beneficial for modifying the structure and morphology of carbon aerogel, and the dynamic behavior of the column with respect inlet benzene concentration can be explained by Yan-Nelson model.

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Multistep Removal System of Gaseous Toluene: Adsorption, Electrochemical, and Photolytic Treatments

Bolaños‐Romero,

López‐Carbajal,

Sandoval‐González

et al. 2024

ChemPlusChem

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The multistep system integrating AT, ECT and PT was more efficient overall (99.58 %) than the individual treatments (AT = 50.29 %, ECT = 44.38 %, and PT = 52.71 %) as evaluated by gas chromatography with a BID detector; it showed enhanced efficiency enabled by the synergistic effects of combining multiple technologies to enhance the overall toluene degradation efficiency and flexibility. The multistage systems can be adapted to specific contamination conditions and process requirements with the generation of residual toluene, phenol, and aliphatic compounds and possible mineralization to molecules such as CO2, CO, and H2O. This small and portable multistep system provides a novel approach for treating outdoor and/or indoor air contaminated with toluene.

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Preparation of Carbon-Alumina (C/Al2O3) aerogel nanocomposite for benzene adsorption from flow gas in fixed bed reactor

Abstract: Graphical abstract

Cited by 8 publications

References 30 publications

Influence of Synthesis-Heating Conditions on the Porosity and Performance of a Carbon Nanotube/SDS-Alumina Nanocomposite for Effective Wastewater Treatment: Fabrication, Characterization, and Adsorption Modeling

Influence of Synthesis-Heating Conditions on the Porosity and Performance of a Carbon Nanotube/SDS-Alumina Nanocomposite for Effective Wastewater Treatment: Fabrication, Characterization, and Adsorption Modeling

Use of NH4Cl for activation of carbon xerogel to prepare a novel efficacious adsorbent for benzene removal from contaminated air streams in a fixed-bed column

Multistep Removal System of Gaseous Toluene: Adsorption, Electrochemical, and Photolytic Treatments

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