Preparation of hydrophobic granular silica aerogels and adsorption of phenol from water

Qin, Guotong; Yao, Yuan; Wei, Wei; Zhang, Tao

doi:10.1016/j.apsusc.2013.05.066

Cited by 50 publications

(21 citation statements)

References 20 publications

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“…This finding is in accordance with the finding of a previous study (23) and may be due to the fact that both models have been developed to explain multilayer coverage of adsorption of molecules onto an adsorbent with heterogeneous sorption sites. Similar to the current study, Qin et al (12) introduced the Freundlich isotherm as the best adequate model in phenolgranular silica aerogel system, supporting the idea of physical adsorption of phenol on silica aerogel surface. A value of n > 1 in the Freundlich model shows the favorable adsorption of phenol onto silica aerogel (41 The reason for poor fitting of Jovanovich isotherm could be due to the fact that this equation is developed on the basic assumption of monolayer adsorption (22).…”

Section: Adsorption Isothermssupporting

confidence: 84%

“…There are various methods for phenol removal from aqueous solutions, such as Fenton-based technologies (3), ozonation (4), coagulation (5), biological processes (6), adsorption (7), electro-oxidation (8), and electrocoagulation (9). ity (up to 99%), and high modification capability (12)(13)(14). Up to now, this adsorbent has been widely applied to remove various toxic compounds, such as heavy metals (14), Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) compounds (15), dyes (11), and so on.…”

Section: Introductionmentioning

confidence: 99%

“…As far as the authors are aware, however, there is a limited knowledge about the adsorptive behavior of silica aerogel for phenol removal under various conditions of operation. In a study conducted by Qin et al (12), for example, silica aerogel with different extents of hydrophobicity was prepared and utilized to remove phenol while they focused only on kinetic/isotherm studies and ignored the effect of operational parameters on phenol adsorption.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Preparation, Characterization, and Application of Silica Aerogel for Adsorption of Phenol: An In-Depth Isotherm Study

et al. 2018

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This study evaluated silica aerogel as an adsorbent for phenol removal from aqueous solutions. Silica aerogel was prepared through the sol-gel process and characterized by different analyses. Then, it was used for phenol removal under various conditions of operational parameters. Also, twelve isotherm parameters were employed to describe the behavior of phenol-silica aerogel adsorption system. The chemical structural analysis confirmed -OH functional groups in amorphous SiO2 and proved the adsorption of phenol onto the surface of silica aerogel. The findings of the adsorptive behavior of silica aerogel toward phenol showed increasing pH, up to 8.5, and contact time, and adsorbent dose increased the phenol removal. The removal efficiency reached over 90% when phenol concentration was below 50 mg L -1 . The reaction kinetics followed the pseudo-first order model. The isotherm study showed that equilibrium adsorption data were well-described by Freundlich and Halsey equations, among two-parameter isotherms, and Hill, Sips, and Koble-Corrigan, among three-parameter isotherms. Jovanovic and BET were the worst isotherm models for prediction of experimental equilibrium data. The maximum adsorption capacity of 75.23 mg.g -1 was calculated in phenol-silica aerogel adsorption system. The study showed silica aerogel as an efficient adsorbent to remove phenol from phenol-containing solutions.

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Section: Adsorption Isothermssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation, Characterization, and Application of Silica Aerogel for Adsorption of Phenol: An In-Depth Isotherm Study

et al. 2018

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“…Among these proposed methods, adsorption is an effective method for the removal of phenolic compounds from wastewater due to its simplicity and easy operation process. A variety of adsorbents were used to remove phenolic pollutants from wastewater including activated carbon , fly ash (Srivastava et al 2006;Chaudhary and Balomajumder 2014), polymers (Huang et al 2013;Pacurariu et al 2013), mesoporous sieves (Fu et al 2011), chitosan (Zhou et al 2014), zeolites (Yousef et al 2011) and silica (Qin et al 2013). LorencGrabowska et al (2013) reported that the adsorption Electronic supplementary material The online version of this article (doi:10.1007/s13762-015-0827-9) contains supplementary material, which is available to authorized users.…”

Section: Introductionmentioning

confidence: 99%

Preparation of amino functionalized imidazolium-modified silicas by different coupling agents for removal of 2,4-dinitrophenol from aqueous solutions

Wang

2015

Int. J. Environ. Sci. Technol.

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Amino group exhibits alkaline properties. Amino functionalized imidazole-modified silicas would benefit the adsorption of phenolic compounds. Coupling agent between the silica and the imidazolium ring has an effect on adsorption performance. In this paper, two adsorbents were synthesized for the surface bonding of N-(3-aminopropyl)-imidazole onto silicas modified by 3-chloropropyltriethoxysilane and 3-mercaptopropyltrimethoxysilane, respectively. Infrared spectra, elemental analysis, thermogravimetric analysis and N 2 adsorptiondesorption isotherms were used to characterize the two adsorbents, and their adsorption capacities of 2,4-dinitrophenol from aqueous solutions were investigated in detail. The experimental results indicated that amino group plays an important role in the enhancement of adsorption capacities of 2,4-dinitrophenol. The adsorbent with 3-mercaptopropyltrimethoxysilane as coupling agent exhibited lower adsorption capacity due to a weak electron-electron repulsion between the non-bonding electrons of sulfur atom and p electrons of benzene ring of 2,4-dinitrophenol. The adsorption kinetics fitted well with pseudo-second-order model. The two adsorbents could be regenerated and reused eight times at least by washing with HCl. The adsorption mechanism was also discussed.

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“…Adsorption is a widely used technique for removal of many organic compounds including phenol (El-Naas et al, 2010;Zain et al, 2014). The most common adsorbents are activated carbon, carbon nanospheres, SiO 2 , chitin (Pigatto et al, 2013), fly ash (Chaudhary and Balomajumder, 2014) and synthetic polymeric adsorbents (Qin et al, 2013). Some low cost adsorbent such as bagasse, coconut shell, tea waste biomass and press mud were also studies (Chaudhary and Balomajumder, 2014).…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study for the Treatment of Refinery Synthetic Wastewater Containing Phenol

Altaher¹,

Ashour²,

Sawalha³

et al. 2015

Science, Technology and Development

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Abstract:In this study, removal of phenol which is classified as priority pollutant by US EPA, was experimentally investigated using different removal techniques including; adsorption using Granular Activated Carbon (GAC), biodegradation using six different active phenol uptaking bacteria, combined GAC sorption and biodegradation (Biological Activated Carbon, BAC) and GAC coupled with inactive bacteria (biosorption). A solution of 100 mg LG 1 phenol at room temperature was considered as the wastewater. The study was performed in the temperature range 25-30°C. The results of these different techniques revealed that activated carbon sorption is better than the other methods in removing phenol. The removal efficiency of this technique reached a value of 97% corresponding to residual phenol concentration of 3 mg LG 1 . The equilibrium sorption was reached after 48 h of contact. The adsorption data was better fitted to Langmuir model with adsorption capacity of 90 mg gG 1 . The adsorption was found to be second order with both intraparticle diffusion and film diffusion to control the adsorption process. The least effective removing method of phenol was the biodegradation using active bacteria alone. The residual concentration of phenol attained by this method was 17 mg LG 1 . According to the results of this study approximately 80% of the overall biological activity for removal of phenol was due to the surface sorption on the cell wall, whereas, about 20% of this activity was due to biodegradation.

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Preparation of hydrophobic granular silica aerogels and adsorption of phenol from water

Cited by 50 publications

References 20 publications

Preparation, Characterization, and Application of Silica Aerogel for Adsorption of Phenol: An In-Depth Isotherm Study

Preparation, Characterization, and Application of Silica Aerogel for Adsorption of Phenol: An In-Depth Isotherm Study

Preparation of amino functionalized imidazolium-modified silicas by different coupling agents for removal of 2,4-dinitrophenol from aqueous solutions

A Comparative Study for the Treatment of Refinery Synthetic Wastewater Containing Phenol

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