scholarly journals DESORPSI β-KAROTEN MINYAK KELAPA SAWIT (CRUDE PALM OIL) DARI KARBON AKTIF MENGGUNAKAN ISOPROPANOL

2017 ◽  
Vol 5 (4) ◽  
pp. 1-7
Author(s):  
Nurul Aini ◽  
Olyvia Putri Wardhani ◽  
Iriany
Keyword(s):  
Activation Energy ◽  
Activated Carbon ◽  
Isopropyl Alcohol ◽  
Desorption Kinetics ◽  
Crude Palm Oil ◽  
Desorption Process ◽  
First Order ◽  
Constant Rate ◽  
Β Carotene ◽  
Main Material

The aim of the research is to study the ability of isopropyl alcohol in the desorption of β-carotene and to obtain kinetic model and desorption isoterm which is suitable in β-carotene desorption. The main material used were isopropyl alcohol and activated carbon containing β-carotene. The variabels used in this research are desorption temperature,  activated carbon concentration  and parameter observed is concentration of β-carotene in isopropyl alcohol. In the desorption process, activated carbon which adsorp β-carotene was soaked in isopropyl alcohol. To review the desorption kinetics, this research was carried out in various temperature such as 40 oC, 50 oC, and 60 oC. In desorption isoterm process is, various mass of activated carbon was used. Desorption process will be analyzed at spesified time. This research used the first order of desorption kinetics model. The desorption constant rate obtained for 40 oC, 50 oC, and 60 oC are 0,013, 0,014, and 0,036 minute-1 with activation energy is 0,226 kkal/mol. The maximum desorption percentage obtain is 41,94 %. The desorption isoterm model which fit with the β-carotene desorption was Langmuir isoterm model with constanta value 1,2077 L/mg and -0,2218.

scholarly journals Adsorption of β-Carotene in Isopropyl Alcohol with Decolorized Activated Carbon as Model for β-Carotene Adsorption in Crude Palm Oil

2017 ◽  
Vol 17 (1) ◽  
pp. 105 ◽  
Author(s):  
Maria Ulfah ◽  
Sri Raharjo ◽  
Pudji Hastuti ◽  
Purnama Darmadji
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Palm Oil ◽  
Isopropyl Alcohol ◽  
Total Pore Volume ◽  
Optimum Concentration ◽  
Crude Palm Oil ◽  
Isotherm Study ◽  
Preliminary Study ◽  
Β Carotene

The objective of this research was to characterize the porosity of decolorized activated carbon (DAC) and its ability to adsorb β-carotene as a preliminary study to characterize activated carbon as an adsorbent to adsorb carotene from crude palm oil. The capability of DAC to adsorb β-carotene was studied using isopropyl alcohol as a solvent in equilibrium conditions. The adsorption time was specified for 0.5 to 60 min, while the DAC optimum concentration for adsorption of β-carotene was determined at a concentration of 0.5 to 2.5%. Adsorption isotherm study was conducted for a β-carotene concentration of 100 to 500 ppm and at temperatures of 30, 40 and 50 °C at equilibrium time and DAC optimum concentration. The results showed that the DAC had a surface area of 1068.391 m2/g, total pore volume of 0.952 cc/g, mesopore volume of 0.528 cc/g (55.4%) and mesopore radius of 15.26 Å. Based on the levels of β-carotene adsorbed onto the DAC, the equilibrium was reached after adsorption of 5 min. Decolorized activated carbon with a concentration of 1.5% was able to adsorb β-carotene optimally. Adsorption of β-carotene at 40 °C for 60 min according to Freundlich models with the intensity of adsorption of 1.002 and adsorption capacity of 63.358 L/mg. While the adsorption of β-carotene at 50 °C for 60 min in accordance with the model of Langmuir, the adsorption capacity of 33.206 mg/g and the Langmuir adsorption equilibrium constant of 1.721 L/mg.

scholarly journals Desorption of β-carotene from bentonite adsorbent under microwave irradiation

2015 ◽  
Vol 34 (2) ◽  
pp. 363
Author(s):  
Tatjana Novaković ◽  
Ljiljana Rožić ◽  
Srdjan Petrović ◽  
Dragomir Stanisavljev
Keyword(s):  
Free Energy ◽  
Microwave Irradiation ◽  
Coefficient Of Determination ◽  
Desorption Kinetics ◽  
Desorption Process ◽  
First Order ◽  
Two Component ◽  
Equilibrium Data ◽  
Desorption Equilibrium ◽  
Β Carotene

<p>The desorption behavior of <em>β</em>-carotene from a bentonite adsorbent under microwave irradiation in isopropanol was studied as a function of temperature and different initial loading concentrations. A first-order, two-component, three-parameter model described the desorption kinetics with a coefficient of determination <em>R</em><sup>2</sup> &gt; 0.9932, and the <em>β</em>-carotene desorption process under microwave irradiation was controlled by both rapid and slow desorption. The activation energies of <em>β</em>-carotene desorption for the rapid and slow desorption processes were 19.61 and 53.04 kJ mol<sup>–1</sup>, respectively. It was observed that the desorption equilibrium data fitted well to both the Freundlich and Langmuir isotherms. The data obtained from the desorption-isotherm model were used to determine the thermodynamic parameters. The positive value of free energy indicates the non-spontaneity of <em>β</em>-carotene desorption. The change in entropy relative to the enthalpy of desorption reveals that the reaction is physical in nature.</p>

scholarly journals ADSORPSI β-KAROTEN YANG TERKANDUNG DALAM MINYAK KELAPA SAWIT (CRUDE PALM OIL) MENGGUNAKAN KARBON AKTIF

2016 ◽  
Vol 5 (1) ◽  
pp. 52-57
Author(s):  
Irvan ◽  
Olyvia Putri Wardhani ◽  
Nurul Aini ◽  
Iriany
Keyword(s):  
Activated Carbon ◽  
Correlation Coefficient ◽  
Palm Oil ◽  
Adsorption Process ◽  
Final Concentration ◽  
Kinetics Model ◽  
Isotherm Models ◽  
Crude Palm Oil ◽  
Enthalpy Changes ◽  
Β Carotene

Crude palm oil (CPO) is the richest natural source of carotenoids which gives the reddish-orange color in crude palm oil. The reddish color in  unprocessed palm oil is disliked by consumer. This research is aimed to adsorb the β–carotene from the CPO using activated carbon, then the kinetics, isotherm models and thermodynamics data of the adsorption process were obtained. The main materials used in this research were CPO and activated carbon. The observed parameters were final concentration  and the amounts of adsorbed β–carotene in activated carbon. The adsorption process was conducted by mixing the adsorbent with CPO with the variation of adsorbent: CPO (w/w) ratio = 1 : 3; 1 : 4; 1 : 5 and 1 : 6 with mixing  speed 120 rpm and the temperature of 40, 50 and 60 oC. The sample of CPO and activated carbon was analyzed at every 2 minutes until the equilibrium was achieved. The final concentration of the unadsorbed β–carotene was analyzed using UV-Vis spectrophotometer. The results showed that the more CPO used in the process, the lower the adsorption percentage. The higher the adsorption temperature, the higher  adsorption percentage. Moreover, the maximum adsorption percentage was 95.108%  obtained at ratio 1 : 3 and T = 60 oC. The adsorption isotherm model which fit with the β–carotene adsorption at T = 60 oC was Langmuir model with the correlation coefficient of 0.959. The adsorption kinetics model which fit with the β–carotene adsorption was the second order kinetics model with the correlation coefficient of 0.998. The value of free energy Gibbs (ΔG) = -24,482.484 ; -24,708.059 and -24,933.634 J/mol for each temperature respectively, value of entropy changes (ΔS) = 22.557 J/mol K, and value of enthalpy changes (ΔH) = -17,421.987 J/mol.

scholarly journals Desorption and Re-Adsorption of Procion Red MX-5B Dye on Alumina-Activated Carbon Composite

2018 ◽  
Vol 18 (2) ◽  
pp. 222 ◽  
Author(s):  
Fatma Fatma ◽  
Poedji Loekitowati Hariani ◽  
Fahma Riyanti ◽  
Wiwin Sepriani
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Adsorption Process ◽  
Carbon Composite ◽  
Desorption Process ◽  
Desorption Kinetic ◽  
First Order ◽  
Before And After ◽  
Sem Micrograph ◽  
Pseudo First Order

The alumina-activated carbon has the ability to adsorb and desorb the procion red MX-5B. The research evaluated the influence of desorption agent, contact time, and temperature on desorption process of procion red MX-5B dye with alumina-activated carbon composite and the adsorption capacity of the composite after desorption process. The desorption agents used in desorption process were solution with pH 2−10, H2O2 30 % (v/v), methanol 70% (v/v) and ethanol 70% (v/v). The variation of contact time was in the range from 30 to 270 min and the temperature was set between 30−75 °C. The result concluded that the highest desorption efficiency up to 98.56% was achieved using ethanol 70% (v/v) for 240 min at 45 °C. The desorption kinetic followed the pseudo-first-order with the release constant (kdes) of 6.56 × 10-2 min-1. The SEM micrograph showed there is a more porous surface on the composite after the desorption compared to before the desorption. The EDX analysis indicated that alumina content in the composite was reduced after desorption process. FTIR spectra of the composite before and after desorption process showed a peak of Al−O at 592 and 590 cm-1 which was proved that alumina still exists in the composite after the desorption process. The alumina-activated carbon composite was re-used to adsorb procion red MX-5B dye. After three times of desorption and re-adsorption process, the capacity adsorption was decreased from 12.38 to 7.38 mg/g.

Regeneration of Adsorbent Carbonaceous Materials with Supercritical Water

2006 ◽  
Vol 514-516 ◽  
pp. 1742-1747 ◽  
Author(s):  
M.Jesus Sánchez-Montero ◽  
Francisco Salvador-Palacios ◽  
Aurelio Salvador Palacios ◽  
M.Jesus Martin Rodriguez
Keyword(s):  
Activation Energy ◽  
Activated Carbon ◽  
Adsorption Capacity ◽  
Supercritical Water ◽  
Kinetic Process ◽  
Regeneration Process ◽  
Order Kinetic ◽  
Carbonaceous Materials ◽  
First Order

The aim of this work was to study a new procedure for the regeneration of activated carbon saturated with phenol. The study was accomplished in two steps: extraction of the pollutant with supercritical water at 410 °C and 275 bar, and gasification of phenol with supercritical water at temperatures ranging between 600 - 650 °C. It was observed that the regeneration process was very rapid and effective. The regenerated activated carbon always recovered its original adsorption capacity, even after several regeneration cycles. The gasification of phenol afforded CO2 and H2O, with a very fast first-order kinetic process. The activation energy was very low (0.192 kJ mol-1).

Comparison of H2 Desorption Kinetics from Si(111)7×7 and Si(100)2×l

1990 ◽  
Vol 204 ◽  
Author(s):  
M. L. Wise ◽  
B. G. Koehler ◽  
P. Gupta ◽  
P. A. Coon ◽  
S. M. George
Keyword(s):  
Activation Energy ◽  
Preexponential Factor ◽  
Desorption Kinetics ◽  
Bond Energies ◽  
First Order ◽  
First Order Kinetics ◽  
Upper Limits ◽  
Desorption Activation Energy ◽  
Temperature Programmed ◽  
Kinetics Of

ABSTRACTThe desorption kinetics of hydrogen from the β1 H2 -TPD state on Si(111)7×7 and Si(100)2×l were studied using laser-induced thermal desorption (LITD) and temperature programmed desorption (TPD) techniques. Isothermal LITD studies of H2 desorption from Si(111)7×7 revealed second-order kinetics with a desorption activation energy of Ed = 62 ±4 kcal/mol and a preexponential factor of Vd = 92 ±10 cm2 /s. In contrast, H2 desorption from Si(100)2×l revealed first-order kinetics with an activation energy of Ed = 58 ±2 kcal/mol and a preexponential factor of Vd = 5.5 ±0.5 × 1015 s−1. The desorption kinetics yield similar upper limits for the Si-H bond energies but different desorption mechanisms on Si(lll)7×7 and Si(100)2×l.

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