Kinetic and thermodynamic studies of the biosorption of Cr(VI) by Pinus sylvestris Linn.

Ucun, Handan; Bayhan, Yalçın Kemal; Kaya, Yusuf

doi:10.1016/j.jhazmat.2007.08.018

Cited by 98 publications

(56 citation statements)

References 38 publications

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“…Energetic changes associated with the removal of Cu(II), Zn(II), Cd(II), and Pb(II) onto SiNTh-Py can be evaluated with the help of thermodynamic parameters (∆G˝, ∆H˝and ∆S˝) [32][33][34]. The results are given in Table 4.…”

Section: Thermodynamics Adsorptionmentioning

confidence: 99%

β-Keto-enol Tethered Pyridine and Thiophene: Synthesis, Crystal Structure Determination and Its Organic Immobilization on Silica for Efficient Solid-Liquid Extraction of Heavy Metals

et al. 2016

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Abstract:Molecules bearing β-keto-enol functionality are potential candidates for coordination chemistry. Reported herein is the first synthesis and use of a novel designed ligand based on β-keto-enol group embedded with pyridine and thiophene moieties. The product was prepared in a one-step procedure by mixed Claisen condensation and was characterized by EA, m/z, FT-IR, ( 1 H, 13 C) NMR and single-crystal X-ray diffraction analysis. The new structure was grafted onto silica particles to afford a chelating matrix which was well-characterized by EA, FT-IR, solid-state 13 C-NMR, BET, BJH, SEM and TGA. The newly prepared organic-inorganic material was used as an adsorbent for efficient solid-phase extraction (SPE) of Cu(II), Zn(II), Cd(II) and Pb(II) from aqueous solutions and showed a capture capacity of 104.12 mg¨g´1, 98.90 mg¨g´1, 72.02 mg¨g´1, and 65.54 mg¨g´1, respectively. The adsorption capacity was investigated, in a batch method, using time of contact, pH, initial concentration, kinetics (Langmuir and Freundlich models), and thermodynamic parameters (∆G˝, ∆H˝and ∆S˝) of the system effects.

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Section: Thermodynamics Adsorptionmentioning

confidence: 99%

β-Keto-enol Tethered Pyridine and Thiophene: Synthesis, Crystal Structure Determination and Its Organic Immobilization on Silica for Efficient Solid-Liquid Extraction of Heavy Metals

et al. 2016

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“…The surface of PC contains various functional groups such as alcohols and aldehydes in its cellulose, hemicelluloses, and lignin fractions, which make it suitable for a series of chemical reactions (condensation, etherification, and copolymerization) and surface modifications (Benyoucef and Amrani 2011). Many studies have reported the utilization of PC as an effective biosorbent for the removal of Cu(II) and Pb(II) (Ofomaja et al 2010), Cd(II) and Pb(II) (Argun et al 2008), Cr(IV) (Ucun et al 2008), phosphate ions (Benyoucef and Amrani 2011), textile dyes (Mahmoodi et al 2011), phenol (Vazquez et al 2006), and anionic surfactant sodium dodecyl sulfate (Sen et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Arsenic(III) removal from aqueous solution by raw and zinc-loaded pine cone biochar: equilibrium, kinetics, and thermodynamics studies

Vinh

Zafar

Behera

et al. 2014

Int. J. Environ. Sci. Technol.

156

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The potential of raw pine cone (PC) biochar and its modified form (Zn-loaded biochar) was evaluated for the removal of trivalent arsenic [As(III)] from the aqueous solution. The influence of treatment of PC biochar with Zn(NO 3 ) 2 on the physico-chemical properties of biochar was examined using elemental analyzer, surface area analyzer, thermo-gravimetric analyzer, Fourier transform infrared spectroscopy, and scanning electron microscopy. Experimental results revealed that the removal of As(III) was almost consistent (66.08 ± 3.94 and 87.62 ± 3.88 % on raw and Zn-loaded biochar, respectively) over an acidic pH range of 2-4 as a consequence of high affinity between the positively charged biochar surface and the predominant arsenic species (H 3 AsO 3 and H 2 AsO 4 -), followed by a decrease with increase in pH in the range of 4-12. Langmuir isotherm model was well fitted to the experimental equilibrium data (R 2 = 0.93) rendering the maximum adsorption capacity of 5.7 and 7.0 lg g -1 on raw and Znloaded PC biochar, respectively. The adsorption of As(III) was well represented by pseudo-second order with reaction rate constant (k 2 ) of 0.040 and 0.282 mg g -1 min on raw and zinc-loaded PC biochar, respectively, and was mainly controlled by boundary layer diffusion followed by some extent of intra-particle diffusion. The adsorption process was spontaneous with Gibb's free energy (DG°, -4.42 ± 0.72 and -11.86 ± 1.78 kJ mol -1 ) and exothermic in nature with enthalpy (DH°, 13.25 and 31.10 kJ mol -1) and entropy (DS°, 0.058 and 0.141 kJ mol -1 K -1 ) for raw and zinc-loaded adsorbent, respectively.

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“…entropi değişim. serbest entalpi değişimi ve denge sabiti belirlenerek adsorpsiyon olayı termodinamik olarak incelenir [32]. [33].…”

Section: Adsorpsiyon Termodinamiğinin Incelenmesiunclassified

Utilization of activated carbon produced from fruit juice industry solid waste for the adsorption of reactive red (procion red MX-5B) from aqueous solutions

Pehlivan¹

2017

Pamukkale J Eng Sci

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Kinetic and thermodynamic studies of the biosorption of Cr(VI) by Pinus sylvestris Linn.

Cited by 98 publications

References 38 publications

β-Keto-enol Tethered Pyridine and Thiophene: Synthesis, Crystal Structure Determination and Its Organic Immobilization on Silica for Efficient Solid-Liquid Extraction of Heavy Metals

β-Keto-enol Tethered Pyridine and Thiophene: Synthesis, Crystal Structure Determination and Its Organic Immobilization on Silica for Efficient Solid-Liquid Extraction of Heavy Metals

Arsenic(III) removal from aqueous solution by raw and zinc-loaded pine cone biochar: equilibrium, kinetics, and thermodynamics studies

Utilization of activated carbon produced from fruit juice industry solid waste for the adsorption of reactive red (procion red MX-5B) from aqueous solutions

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