Adsorption of phenol and nitrophenols by carbon nanospheres: Effect of pH and ionic strength

Lazo-Cannata, José C.; Nieto-Márquez, Antonio; Jacoby, Andres; Paredes-Doig, Ana Lucía; Romero, Amaya; Kou, María del Rosario Sun; Valverde, J.L.

doi:10.1016/j.seppur.2011.04.029

Cited by 102 publications

(35 citation statements)

References 37 publications

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“…Meanwhile, the presence of salts can cause a salting-out effect. The dissociative ions in solution form well-organized ionic atmospheres through bind water molecule tightly, thus decreasing the solubility of non-electrolyte (phenol) in solution and improving the removal rate of phenol [21]. On the other hand, in the presence of salts, the active sites of MAC may be blocked, so phenol molecules are hindered to combine the surface of adsorbent, therefore, lead to a decline in phenol removal rate.…”

Section: Effect Of Various Salts On Phenol Removalmentioning

confidence: 99%

Effect of ionic strength on the adsorption behavior of phenol over modified activated clay

Wang

Qiao

et al. 2016

Desalination and Water Treatment

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2014): Effect of ionic strength on the adsorption behavior of phenol over modified activated clay, Desalination and Water Treatment, In this paper, the effect of several inorganic salts (NaCl, KCl, MgCl 2 , ZnCl 2 , Na 2 SO 4 , Na 3 PO 4 ) on phenol adsorption at different ionic strength by cetyl trimethyl ammonium bromide and CaO modified activated clay was studied. The adsorption isotherm, adsorption kinetics and thermodynamic in the presence of NaCl were also investigated. The results showed that phenol removal efficiency has been influenced by the co-existed ions. With the increase of ionic strength from 0.5 to 3 mol kg −1 , the removal of phenol slightly increased, except for ZnCl 2 . The adsorption kinetics showed that the adsorption of phenol can be represented by pseudo-second-order kinetic. The Freundlich model fitted the two processes well. The thermodynamic parameters showed that the two adsorption processes were both exothermic, spontaneous nature, randomness decreasing process.

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Section: Effect Of Various Salts On Phenol Removalmentioning

confidence: 99%

Effect of ionic strength on the adsorption behavior of phenol over modified activated clay

Wang

Qiao

et al. 2016

Desalination and Water Treatment

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“…Compared with the other adsorbents reported in the literature such as AP-55 (280 mg/g), granular activated carbon (32.9 mg/g), charcoal activated powder (187.1 mg/g) (Daifullah and Girgis 1998), activated carbon fibers (418.3 mg/g) , carbon nanospheres (32.8 mg/g) (Lazo-Cannata et al 2011), yellow bentonite (9.9 mg/g) (Yaneva and Koumanova 2006), MIP-SiO 2 (15.6 mg/g) (Luo et al 2008), olive wood (5.9 mg/g) (El-Sheikh et al 2013) and cotton cellulose C2 (11.2 mg/g) (Vismara et al 2009), it can be concluded that the two adsorbents can be used to remove 2,4-DNP from aqueous solutions as effectively as the other adsorbents. Further compared with the previously synthesized imidazole-modified silica adsorbents in our group such as SilprImCl (33.3 mg/g), SilprM 1 ImCl (33.9 mg/g), SilprM 2 ImCl (35.9 mg/g), SilprM 4 ImCl (37 mg/g) and SilprM 1 M 2 ImCl (35.3 mg/g) (Wang et al 2013a, b), it is apparent that SilprP 3 NImBr and SilprSP 3 NImBr show adsorption ability superior to the other imidazole-modified silica adsorbents reported in the literature and is more effective for the adsorption of 2,4-DNP, which may be attributed to the additional electrostatic interactions between the amino groups and 2,4-DNP molecules.…”

Section: Comparison With Other Adsorbentsmentioning

confidence: 93%

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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“…The BJH surface area of pores, BJH mesopore value, and BJH average mesopore diameter were 326.07 m 2 g −1 , 0.7638 cm 3 g −1 , and 9.32 nm, respectively. Compared with the surface area (14.4 m 2 g −1 ) of the CNSs synthesized by Lazo-Cannata et al (2011), the CNSs that were synthesized using fallen willow leaves as raw materials had a larger specific surface area.…”

Section: Characterization Of Cnssmentioning

confidence: 99%

“…More importantly, CNSs exhibits low density, high porosity, large surface area, and relatively high chemical and thermal stability (Wang et al 1999), which make it a potential adsorbent. CNSs have been reported to wipe off chromium ions (Zhang et al 2013), nitro phenols (2, 4-dinitrophenol) (Lazo-Cannata et al 2011), Acid Orange Fig. 1 Characterization of the synthesized CNSs: a SEM image, b TEM image, c HRTEM image, d SAD pattern, e Raman spectrum, f EDS spectrum, g N 2 adsorption/desorption isotherm, h pore size distribution associated 8 (AO8), and Acid Red 88 (AR88) (Konicki et al 2013), and the maximum adsorption capacities were 200.0, 32.9, 454.0, and 555.6 mg g −1 for them, respectively.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of carbon nanospheres using fallen willow leaves and adsorption of Rhodamine B and heavy metals by them

Zhang

Xia

et al. 2014

Environ Sci Pollut Res

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This paper focuses on the synthesis of carbon nanospheres (CNSs) using fallen willow leaves as a low-cost precursor. The scanning electron microscopy (SEM) image and transmission electron microscopy (TEM) image demonstrated that the structure of synthesized CNSs was spherical, with a diameter of 100 nm. The crystal structure and chemical information were characterized by Raman spectrum and energy-dispersive spectrum (EDS), respectively. BET results showed that the CNSs had a larger specific surface area of 294.32 m(2) g(-1), which makes it a potentially superior adsorbent. Rh-B and heavy metal ions such as Cu(2+), Zn(2+), and Cr(6+) were used as targets to investigate the adsorption capacity of the CNSs. The effects of adsorption parameters such as adsorption equilibrium time, dose of CNSs, adsorption kinetics, and effect factors were also studied. These findings not only established a cost-effective method of synthesizing CNSs using fallen willow leaves but also broadened the potential application range of these CNSs.

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Adsorption of phenol and nitrophenols by carbon nanospheres: Effect of pH and ionic strength

Cited by 102 publications

References 37 publications

Effect of ionic strength on the adsorption behavior of phenol over modified activated clay

Effect of ionic strength on the adsorption behavior of phenol over modified activated clay

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

Synthesis of carbon nanospheres using fallen willow leaves and adsorption of Rhodamine B and heavy metals by them

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