Effects of acid washing treatment on the adsorption equilibrium of volatile organic compounds on titanate nanotubes

Lee, Chung‐Kung; Chen, Huang-Chi; Liu, Shin-Shou; Huang, Fu-Chuang

doi:10.1016/j.jtice.2009.10.001

Cited by 14 publications

(8 citation statements)

References 27 publications

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“…This could be attributed to the oversimplifying assumptions of the BET model concerning the multilayer region. Model parameters for both BET and GAB equations show no definite trend with increasing temperature (Lee et al 2010;Dural and Chen 1997).…”

Section: Isotherm Modelingmentioning

confidence: 89%

“…On the other hand, the hydrophobic bonding by conglomeration of large C 16 alkyl groups associated with HDTMA can render a positive charge development on the surface of TNTs, from which the organic anions (such as acid dyes) can be removed from aqueous solution with anion exchange mechanism (Juang et al 2008). Volatile organic compounds (VOC), including n-hexane, benzene, toluene, p-xylene, mxylene, and o-xylene, adsorption study of TNTs is fairly recent (Lee et al 2010). It is found that the adsorption capacity of TNTs positively correlated with their specific surface area and pore volume, and TNTs may be an effective adsorbent for the removal of VOC from gas phase.…”

Section: Introductionmentioning

confidence: 99%

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Effects of pore structure and surface chemical characteristics on the adsorption of organic vapors on titanate nanotubes

et al. 2012

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Effects of pore structure and surface chemical characteristics of titanate nanotubes (TNTs) on their adsorptive removal of organic vapors were investigated. TNTs were prepared via a hydrothermal treatment of TiO 2 powders in a 10 M NaOH solution at 150°C for 24 h, and subsequently washed with HCl aqueous solution of different concentrations. Effects of acid washing process (or the sodium content) on the microstructures and surface chemical characteristics of TNTs were characterized with nitrogen adsorption-desorption isotherms, FTIR, and water vapor adsorption isotherms. For the adsorption experiments, gravimetric techniques were employed to determine the adsorption capacities of TNTs for four organic vapors with similar heats of vaporization (i.e., comparable heats of adsorption) but varying dipole moments and structures, including n-hexane, cyclohexane, toluene, and methyl ethyl ketone (MEK), at isothermal conditions of 20 and 25°C. The experimental data were correlated by well-known vapor phase models including BET and GAB models. Isosteric heats of adsorption were calculated and heat curves were established. Equilibrium isotherms of organic vapors on TNTs were type II, characterizing vapor condensation to form multilayers. The specific surface area (and pore volume) and hydrophilicity of TNTs were the dominating factors for the determination of their organic vapors adsorption capacity. The GAB isotherm equation fitted the experimental data more closely than the BET equation. The heats of adsorption showed that the adsorption of organic vapors on TNTs was primarily due to physical forces and adsorbates with larger polarity might induce a stronger interaction with TNTs.

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Section: Isotherm Modelingmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Effects of pore structure and surface chemical characteristics on the adsorption of organic vapors on titanate nanotubes

et al. 2012

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“…The production of AC requires carbonization and activation. Therefore, several studies have attempted to develop economical adsorbents (Hsu et al, 2004;Lee et al, 2010;Zhou et al, 2015). However, air frequently has a high moisture content during adsorption, and most VOCs are hydrophobic compounds.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the surface characteristics of TNTs might vary with the synthesis conditions, including the reaction time, synthesis temperature, acid concentration during washing, and calcination temperature (Weng et al, 2006;Lee et al, 2008). By exploiting its properties, several researchers have used TNTs to adsorb basic dyes or cations in aqueous systems (Yoshida et al, 2005;Lee et al, 2007Lee et al, , 2010. TNTs have rarely been used for adsorbing organic vapors.…”

Section: Introductionmentioning

confidence: 99%

Sorption of Volatile Organic Compounds on Organic Substance-Modified Titanate Nanotubes

Wang

Peng

Chao

2015

Aerosol Air Qual. Res.

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This study investigates the removal of volatile organic compounds (VOCs) from the air through the use of organic substance-modified titanate nanotubes (TNTs). The TNTs were derived from TiO 2 through a hydrothermal method, and were modified using hexadecyltrimethylammonium bromide and octadecyltrichlorosilane (OTS) to change the surface hydrophilicity to hydrophobicity. The properties of the TNT and modified TNT were characterized through scanning electron microscopy , transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, contact angle measurements, and nitrogen adsorption-desorption isotherms. The fabricated adsorbents were used to remove the VOCs of toluene, ethylbenzene 1,1,2-trichloroethane, and tetrachloroethene in the air. The adsorption amounts of the VOCs were estimated using the Thomas equation. The results revealed that adsorbent modification raised the adsorption capacities of these VOCs, which also grew with increasing surface hydrophobicity. The aromatic compounds accumulated easily in the pores to generate relatively high adsorption amounts. VOCs adsorbed on the TNT surface or partitioned into the organic substance on TNTs. The adsorption amounts of VOCs on the OTSmodified TNTs were higher than those on commercial activated carbon. The results imply that organic substance-modified TNTs can effectively remove VOCs in the air and become excellent adsorbents.

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“…Titanate nanotubes have attracted considerable attention for their potential applications in photocatalytic reaction [1][2][3][4], lithium battery [5,6], adsorption [7][8][9], thermoelectric property [10] and luminescence [11,12] because of their large specific surface area and unique photoelectric properties. A simple and cost effective hydrothermal method for the large scale production of titanate nanotubular material was firstly reported by Kasuga et al [13].…”

Section: Introductionmentioning

confidence: 99%

Lead titanate nanotubes synthesized via ion-exchange method: Characteristics and formation mechanism

Song

Cao

et al. 2011

Journal of Alloys and Compounds

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Effects of acid washing treatment on the adsorption equilibrium of volatile organic compounds on titanate nanotubes

Cited by 14 publications

References 27 publications

Effects of pore structure and surface chemical characteristics on the adsorption of organic vapors on titanate nanotubes

Effects of pore structure and surface chemical characteristics on the adsorption of organic vapors on titanate nanotubes

Sorption of Volatile Organic Compounds on Organic Substance-Modified Titanate Nanotubes

Lead titanate nanotubes synthesized via ion-exchange method: Characteristics and formation mechanism

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