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Kinetic and multi-parameter isotherm studies of picric acid removal from aqueous solutions by carboxylated multi-walled carbon nanotubes in the presence and absence of ultrasound
Soheila Gholitabar, Hasan Tahermansouri 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 2 14-24 (11 pages)
(1998). https://doi.org/10.1016/S0043-1354(97)00310-2. [32] Terzyk AP. Further insights into the role of carbon surface func- tionalities in the mechanism of phenol adsorption. J Colloid Interface Sci, 268, 301 (2003). https://doi.org/10.1016/S0021- 9797(03)00690-8. [33] Lagergren S. Zur theorie der sogenannten adsorption geloster stoffe, Kungliga Svenska Vetenskapsakademiens. Handlingar, 24, Carboxylated multi-wall carbon nanotubes (MWCNTs-COOH) have been used as efficient adsorbents for the removal of picric acid from aqueous solutions under stirring and ultrasound conditions. Batch experiments were conducted to study the influence of the different parameters such as pH, amount of adsorbents, contact time and concentration of picric acid on the adsorption process. The kinetic data were fitted with pseudo-first order, pseudo-secondorder, Elovich and intra-particle diffusion models.... -
Nanoporous carbon synthesized from grass for removal and recovery of hexavalent chromium
Shahin A. Pathan, Nancy S. Pandita 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 2 10-18 (9 pages)
depicts the kinetics of Cr(VI) onto Af-NPC at vari- ous time intervals. Analysis of sorption kinetics was carried out by Lagergren pseudo frst-order model and Ho’s pseudo-second- order reaction rate model [20]. Mathematical representations of these models are given in eqs 3 and 4, respectively. Lagergren pseudo-frst-order equation: (3) was favorable and that Af-NPC is a good adsorbent. At lower... Nanoporous carbon structures were synthesized by pyrolysis of grass as carbon precursor. The synthesized carbon has high surface area and pore volume. The carbon products were acid functionalized and characterized by Fourier transform infrared spectroscopy, X-ray diffraction, Brunauer?Emmett?Teller, transmission electron microscopy, and Energy Dispersive X-ray microanalysis. Acid functionalized nanoporous carbon was explored for use in removal of toxic Cr(VI) ions from aqueous media. An... -
Adsorption capability of activated carbon synthesized from coconut shell
Md Shariful Islam, Bee Chin Ang, Samira Gharehkhani, Amalina Binti, Muhammad Afifi 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 1 1-9 (9 pages)
of the activated carbon, Lagergren-frst-order [62], pseudo-second-order [63] and Weber and Morris intra-particle diffusion reaction models [64] were used to determine the kinetics of the adsorption of methyl orange from an aqueous solution. Lagergren frst order kinetic model; the linear form of the La- gergren frst order kinetic model is represented by the following formula. position and... Activated carbon was synthesized from coconut shells. The Brunauer, Emmett and Teller surface area of the synthesized activated carbon was found to be 1640 m2/g with a pore volume of 1.032 cm3/g. The average pore diameter of the activated carbon was found to be 2.52 nm. By applying the size-strain plot method to the X-ray diffraction data, the crystallite size and the crystal strain was determined to be 42.46 nm and 0.000489897, respectively, which indicate a perfect crystallite structure. The... -
Removal of methylene blue using lemon grass ash as an adsorbent
Harminder Singh, Dawa Tshering B 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.2 6 105-112 (8 pages)
of Lagergren pseudo-frst order and pseudo- second order adsorption kinetic models were tested with the data obtained in the study for the effect of variation in contact time. The linearized form of the pseudo-frst order Lagergren equa- tion can be presented as Fig. 1. Fourier transform infra-red spectroscopy of lemon grass waste ash. Fig. 2. Scanning electron microscopy image obtained before and... and increased contact time and dose of adsorbent. The basic pH solution of dye showed better adsorption capacity as compared to the acidic dye solution. Langmuir and Freundlich adsorption isotherms were fitted to the data well. Data fitted better to Lagergren pseudo 2nd order kinetics than a 1st order kinetic model. Surface morphology was also examined via scanning electron microscopy. An elemental analysis was also carried out and the chemical composition and functional groups were analyzed usi... -
Removal of Reactive Blue 19 dye from Aqueous Solution Using Natural and Modified Orange Peel
Sohair A. Sayed Ahmed, Laila B. Khalil, Thoria El-Nabarawy 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2012, Vol.13 No.4 3 212-220 (9 pages)
indicating completely adsorbed monolayers. Determination of order of the dye adsorption process and the rate constant were obtained by applying Lagergren’s pseudo frst-order kinetic model [32], a pseudo second-order kinetic model [33], the Elovich equation [34] and the intraparticle diffu- sion model [35]. The kinetic rate constants and the correspond- ing correlation coeffcients R 2 are... -
Role of Activated Carbon Modified by H3PO4 and K2CO3 From Natural Adsorbent for Removal of Pb (II) From Aqueous Solutions
MahboobehManoochehri, AmenehKhorsand, ElhamHashemi 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2012, Vol.13 No.3 6 167-172 (6 pages)
Afterwards, many researchers reported frst order La- gergern kinetics for adsorption of different pollutants on differ- ent sorbents [13]. The linearized form of the pseudo frst-order equation of Lagergren is generally expressed as follows [14]: (9) where qt is the amount of Pb (II) adsorbed (mg/g) at time t, k1 is the equilibrium rate constant of the pseudo-frst order kinetics (min -1), and t... -
Role of modified activated carbon by H3PO4 or K2CO3 from natural adsorbent for removal of Pb(II) from aqueous solutions
Mahboobeh Manoochehri, Ameneh Khorsand, Elham Hashemi 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2012, Vol.13 No.2 7 115-120 (6 pages)
adsorption of different pollutants on different sorbents [14]. The linearized form of the pseudo frst-order equation of Lagergren is generally expressed as fol- lows [15]: (9) where qt is the amount of Pb(II) adsorbed (mg/g) at time t, k1 is the equilibrium rate constant of pseudo-frst order kinetics (min -1) and t is the constant time (min). According to Eq. (9) the plots of h (qe-qt) vs.... -
Equilibrium, kinetic and thermodynamic studies of the adsorption of acidic dye onto bagasse fly ash
MonaA.Shouman, NadyA.Fathy, SaharM.El-Khouly, AminaAAttia 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2011, Vol.12 No.3 4 143-151 (9 pages)
3.5.1 Pseudo-frst-order model The rate constant of adsorption is determined from the frst order rate expression given by the Lagergren equation [29]. (2) where qe and qt are the amounts of dye adsorbed at equilibrium (mg/g) and at time t (min), respectively, and k1 is the rate constant of the pseudo frst order adsorption (min -1). Values of K1 were calculated from the plots of log (qe qt) vs.... -
Utilization of Cotton Stalks-Biomass Waste in the Production of Carbon Adsorbents by KOH Activation for Removal of Dye-Contaminated Water
Nady A.Fathy, Badie S Girgis, Lila B.Khalil, Joseph Y.Farah 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2010, Vol.11 No.3 9 224-234 (11 pages)
solutions and explain the obtained experimental data [9]. The kinetics of adsorption can be described by the first-order Lagergren equation that is given by Eq. (7): log (q e qt) = log qe (7) where qe and qt are the amounts of dye adsorbed at equili- brium (mg/g) and at time t (min) respectively, and K1 is the equilibrium rate constant of pseudo first order sorption (min -1). In some cases a... -
Capacity of Activated Carbon Derived from Agricultural Waste in the Removal of Reactive Dyes from Aqueous Solutions
Mahboobeh Manoochehri, V.K.Rattan, Ameneh Khorsand, Homayon Ahm 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2010, Vol.11 No.3 1 169-175 (7 pages)
In order to examine the controlling mechanism of the adsorption process, pseudo-first order and pseudo-second order equations were used to test the experimental data. Pseudo-first order equation of Lagergren based on solid capacity is given by [22]: (9) Where q t is the amount of dye adsorbed (mol/g) at time t, k1 the equilibrium rate constant of pseudo-first order kinetics (min -1) and t is the...