On a Theory of the van der Waals Adsorption of Gases

Brunauer, Stephen; Deming, Lola S.; Deming, W. Edwards; Teller, Edward

doi:10.1021/ja01864a025

Cited by 4,480 publications

(2,174 citation statements)

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“…Details on the optimization of the synthesis conditions have been discussed in previous investigations (Carvalho et al, 2004(Carvalho et al, , 2006Mestre et al, 2007;Parra et al, 2004Parra et al, , 2006 and remain out of the scope of this paper, which is devoted to the potential application of these wastederived adsorbents for the removal of pharmaceuticals from aqueous phase. Nevertheless for data interpretation purposes, the main textural parameters of the synthesized carbons are reported in Table 1. The N 2 adsorption isotherms (not shown) of the carbons obtained from activation of cork and PET residues (samples CAC and P, respectively) belong to type I in the BDDT classification (Brunauer et al, 1940), with a sharp knee at low relative pressures, indicating that the microporosity of these samples is mainly composed of pores of small diameter. A further analysis of the PSD combining the information of N 2 and CO 2 adsorption isotherms indicated that the pore volume determined by CO 2 data in CAC carbon is larger than the corresponding volume of micropores "seen" by N 2 , confirming that the narrow microporosity (ultramicropores, pore widths < 0.7 nm) represents an important contribution for the overall porosity of this carbon.…”

Section: 1characterization Of the Adsorbentsmentioning

confidence: 99%

Waste-derived activated carbons for removal of ibuprofen from solution: Role of surface chemistry and pore structure

Mestre

Pires

Nogueira

et al. 2009

Bioresource Technology

227

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ABSTRACT. The removal of a widespread used drug (i.e., ibuprofen) from water was investigated using high valuable carbon adsorbents obtained from chemical and physical activation of a bioresource (cork) and a municipal waste (plastic). The waste-derived carbons outperformed the adsorption capacity of commercial carbonaceous adsorbents due to their adequate features for the removal of the targeted compound. Regarding the adsorption mechanism the results obtained point out that ibuprofen retention is favored in activated carbons with basic surface properties. On the other hand, the textural features also play an important role; the presence of a transport pores network (i.e., mesopores) is crucial to ensure the accessibility to the inner porosity and the microporosity must be large enough to accommodate the ibuprofen molecule. Specifically, adsorbents with a large fraction of ultramicropores (pore widths < 0.7 nm) are not adequate to effectively remove ibuprofen.

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Section: 1characterization Of the Adsorbentsmentioning

confidence: 99%

Waste-derived activated carbons for removal of ibuprofen from solution: Role of surface chemistry and pore structure

Mestre

Pires

Nogueira

et al. 2009

Bioresource Technology

227

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show abstract

“…4. The isotherms were of type IV which shows a typical mesoporous solid, according to IUPAC classification [12]. All the samples exhibited strong adsorption at a relative pressure in the range of 0.2 ≤ P/P 0 ≤ 0.5.…”

Section: Nitrogen Adsorptionmentioning

confidence: 95%

Physicochemical Properties of CuO2 (acac)2 Supported on Functionalized MCM41 Containing Thiourea Ligand

Ahmad¹,

Rasid²,

Kassim³

2013

IJCEA

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A new material is prepared by encapsulating functionalized-MCM41 with 2-hydroxy-2-mercaptopyrimidine (2-thiouracil) and copper acetate monohydrate. The functionalized-MCM41 was first synthesized by using Ludox as silica source and cetyltrimethylammonium bromide (CTABr) as template and was modified via co-condensation method using 3-aminopropyltriethoxysilane (APTES). The surface and textural of synthesized material have been characterized by using X-ray diffraction (XRD), N2 adsorption isotherms, BET surface area measurement, FT-IR, elemental analyzer and scanning electron microscopy (SEM). The low-angle XRD results indicated that the CuO2(acac)-Thio-APS-MCM41has similar XRD pattern as the mesoporous MCM41 although the intensity decreases. For high-angle XRD, the results show the presence of monoclinic CuO at 2θ = 35.3 and 38.6° while N2 adsorption and BET results were revealed that the CuO2(acac)-Thio-APS-MCM41 possessed a good mesoporous structural ordering and uniform mesoporosity. FTIR spectra confirmed that the organosilane group still retained in the pore channel of the CuO2(acac)-Thio-APS-MCM41 even after modification and the band of C=S and Cu=O also appeared in CuO2(acac)-Thio-APS-MCM41 spectra with the presence of thiourea ligand and copper. Hence, the characterization results were revealed that the synthesized material has an ordered hexagonal structure, a narrow pore size distribution, a high surface area and thiourea complex were successfully grafted onto the pores of functionalized-MCM41

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“…The analysis of the plots in the Figs. 6 and 7 shows a type II isotherm [20] indicating the presence of mesopores (pores with a diameter of 2-100 nm) and an H-1 hysteresis [21]. The H-1 hysteresis suggests the presence of agglomerates with cylindrical pores for the powders.…”

Section: Horas: (A) 1% (B) 5% E (C) 7%]mentioning

confidence: 99%

Structural and morphological characterization of rare earth modified lead titanate

Lemos¹,

Melo²,

Lima³

et al. 2007

Cerâmica

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On a Theory of the van der Waals Adsorption of Gases

Cited by 4,480 publications

References 0 publications

Waste-derived activated carbons for removal of ibuprofen from solution: Role of surface chemistry and pore structure

Waste-derived activated carbons for removal of ibuprofen from solution: Role of surface chemistry and pore structure

Physicochemical Properties of CuO2 (acac)2 Supported on Functionalized MCM41 Containing Thiourea Ligand

Structural and morphological characterization of rare earth modified lead titanate

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