Adsorption-Desorption Characteristics of E.coli by Quartz Sands of Different Particle Size

2014 ◽  
Vol 955-959 ◽  
pp. 436-444
Author(s):  
Zhi Rong Wang ◽  
Wei Li Wang ◽  
Xiao Yan Zhu ◽  
Jing Lan Wang ◽  
Zhi Jie Han ◽  
...  
Keyword(s):  
Particle Size ◽  
Rate Equation ◽  
Second Order ◽  
E Coli ◽  
Order Rate ◽  
Quartz Sands ◽  
Pseudo Second Order ◽  
Adsorption Desorption ◽  
Adsorption Quantity ◽  
Order Rate Equation

Adsorption-desorption characteristics of E. coli by quartz sands of five different particle size (351、319、217、71、27μm) were studied using batch equilibrium method. The results showed that quartz sands had great adsorption quantity of E. coli. The adsorption ratio could reach above 95%,when the initial microbial concentration was 109 cfu/mL. With the decreased of the quartz sand particle size,the adsorption quantity increased,and adsorption reached balance faster. The Pseudo-second-order rate equation is optimal to describe adsorption kinetics of E. coli by quartz sands, and the isothermal adsorption process is suitable to describe using Henry equation. Quartz sands had small desorption ratio of E. coli,the desorption ratio increased as quartz sands particle size increased, the largest desorption ratio was only 3.6%.The desorption dynamic processes and desorption isothermal processes also can be decreased using Pseudo-second-order rate equation and Henry equation respectively. Desorption of E. coli on quartz sands existed obvious hysteresis. It indicated there existed irreversible adsorption between E. coli and quartz sands, which the E. coli adsorbed was hard to desorb. The average particle size of quartz sands have some relevance with the parameters of Henry equation and Pseudo-second-order rate equation. This shows that particle size is one of the important factors that affect the adsorption and desorption.

Biosorption of Lignin Compounds Using Biomass Derived from Eichhornia crassipes: Batch Studies

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Renganathan Sahadevan ◽  
Ajit Balaji Kannavadi Devaraj ◽  
Dharmendira Kumar Mahendradas ◽  
Baskar Gurunathan ◽  
Manickam Velan
Keyword(s):  
Rate Equation ◽  
Eichhornia Crassipes ◽  
Second Order ◽  
Isotherm Model ◽  
Batch Studies ◽  
First Order ◽  
Order Rate ◽  
Pseudo Second Order ◽  
Pseudo First Order ◽  
Order Rate Equation

Biosorption of lignin compounds by the Eichhornia crassipes was investigated in batch studies. Batch experiments were conducted to study the effect of initial sorbent dosage, solution pH and lignin compounds concentration. Langmuir and Freundlich adsorption isotherm models were used to represent the equilibrium data. The Freundlich isotherm model was found to be fitted very well with the experimental data when compared to Langmuir isotherm model. The results showed that the equilibrium uptake capacity was found to be increased with decrease in biomass dosage. The lignin compound removal was influenced by the initial lignin compounds concentration. The sorption results were analysed for pseudo first order and pseudo second order kinetic model. It was observed that the kinetic data fitted very well with the pseudo second order rate equation when compared to the pseudo first order rate equation. Sorption results were analyzed for the intra particle diffusion model.

scholarly journals Kinetic Model for Lead(II) Sorption on to Peat

1998 ◽  
Vol 16 (4) ◽  
pp. 243-255 ◽  
Author(s):  
Y.S. Ho ◽  
G. McKay
Keyword(s):  
Activation Energy ◽  
Particle Size ◽  
Kinetic Model ◽  
Second Order ◽  
Sorption Rate ◽  
Sorption Model ◽  
Order Rate ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Order Rate Equation

The kinetics of lead sorption on to peat have been investigated. The batch sorption model, based on the assumption of a pseudo-second order mechanism, has been developed to predict the rate constant of sorption, the equilibrium capacity and initial sorption rate with the effect of initial lead(II) concentration, peat particle size and temperature. An equilibrium capacity of sorption has been evaluated with the pseudo-second order rate equation. In addition, an activation energy of sorption has also been determined based on the pseudo-second order rate constants.

scholarly journals Kinetika Adsorpsi Gas Benzena Pada Karbon Aktif Tempurung Kelapa

Jurnal MIPA ◽  
2013 ◽  
Vol 2 (2) ◽  
pp. 100
Author(s):  
Rizky B. Holle ◽  
Audy D. Wuntu ◽  
Meiske S. Sangi
Keyword(s):  
Activated Carbon ◽  
Rate Equation ◽  
Order Rate Constant ◽  
Second Order ◽  
Coconut Shell ◽  
Benzene Adsorption ◽  
Order Rate ◽  
Pseudo Second Order ◽  
Order Rate Equation ◽  
Gaseous Benzene

Telah diteliti kinetika adsorpsi gas benzena pada karbon aktif tempurung kelapa yang diaktivasi dengan NaCl dengan tujuan menentukan model kinetika yang dapat diaplikasikan untuk adsorpsi gas benzena pada karbon aktif tempurung kelapa. Data adsorpsi dianalisis dengan menggunakan empat model persamaan laju adsorpsi yaitu (1) persamaan laju order pertama pseudo Lagergren, (2) persamaan laju order kedua pseudo Ho, (3) persamaan Elovich, dan (4) persamaan Ritchie. Hasil kajian menunjukkan bahwa model kinetika dengan persamaan laju order ke-2 pseudo Ho adalah yang paling sesuai diaplikasikan untuk adsorpsi gas benzena pada karbon aktif tempurung kelapa. Dari model kinetika order ke-2 pseudo Ho diperoleh konstanta adsorpsi benzena sebesar 1,63x10-4 g mg-1 min-1. Nilai energi adsorpsi menunjukkan bahwa benzena teradsorpsi secara fisik pada adsorben.Kinetics of gaseous benzene adsorption on coconut shell NaCl-activated carbon had been studied. The research was aimed to determine the appropriate kinetic model applied to gaseous benzene adsorption on the adsorbent. Adsorption data was analyzed using four kinetic models of adsorption rate equation, which were (1) Lagergren’s pseudo first order rate equation, (2) Ho’s pseudo second order rate equation, (3) Elovich‘s equation, and (4) Ritchie’s equation. The results showed that the Ho’s pseudo second order rate equation was best applied to gaseous benzene adsorption on coconut shell activated carbon. The second order rate constant for benzene adsorption was 1.63x10-4 g mg-1 min-1. The value of adsorption energy showed that benzene was physically adsorbed on the adsorbent.

scholarly journals Application of a Mixed Order Model to Determine the Rate Adsorption of 1-Nitronaphthalene onto Activated Carbon

2019 ◽  
pp. 46-56
Author(s):  
Suntree Rincome
Keyword(s):  
Activated Carbon ◽  
Rate Equation ◽  
Second Order ◽  
Coefficient Of Determination ◽  
Rate Equations ◽  
Order Rate ◽  
Mixed Order ◽  
Polycyclic Aromatic ◽  
Pseudo Second Order ◽  
Order Rate Equation

This study investigated the adsorption kinetics of 1-nitronaphthalene solution (a polycyclic aromatic hydrocarbon, PAH) onto seven different masses of activated carbon. The coefficient of determination (r2) was used to determine the best-fit kinetic model and to confirm agreement between experimental data and the kinetic rate equations. The results indicated that adsorption could be defined with masses of 0.0200 g and 0.0501 g when fitted using a second order rate equation. Adsorption on to masses of 0.1003 g, 0.1203, 0.1501 g, and 0.2001 g was best defined when data were fitted to a pseudo second order rate equation. However, adsorption onto a mass of 0.0701g did not fit with any simple rate law. Consequently, a new mathematical mixed order equation was developed to determine the rates of adsorption and the rate constants by combining two orders of equations: the pseudo first order and pseudo second order, to achieve a better fit with the same data.

scholarly journals KINETICS OF GASEOUS TOLUENE ADSORPTION ON CANDLENUT SHELL ACTIVATED CARBON

2013 ◽  
Vol 13 (1) ◽  
pp. 33 ◽  
Author(s):  
Audy D Wuntu ◽  
Vanda S Kamu
Keyword(s):  
Activated Carbon ◽  
Rate Equation ◽  
Order Rate Constant ◽  
Second Order ◽  
Rate Equations ◽  
Order Rate ◽  
Pseudo Second Order ◽  
Gaseous Toluene ◽  
Kinetics Of ◽  
Order Rate Equation

KINETICS OF GASEOUS TOLUENE ADSORPTION ON CANDLENUT SHELL ACTIVATED CARBON ABSTRACT Adsorption kinetics of gaseous toluene on activated carbon prepared from candlenut shell had been studied. The research was performed by examining adsorption data, which was obtained in previous research, over several rate equations, which were: (1) Lagergren’s pseudo first order rate equation, (2) Ho’s pseudo second order rate equation, (3) Elovich’s equation, and (4) persamaan Ritchie’s equation. The result showed that the data of toluene adsorption on candlenut shell activated carbon fits the Ho’s pseudo second order rate equation and, hence, the model is the most applicable model for the adsorption. Calculation from linear regression of Ho’s pseudo second order rate equation gave the equilibrium adsorption capacity value of 56,069 mg g-1, second order rate constant of 3,54x10–4 g mg-1 min-1, and initial adsorption rate of 1,112 mg g-1 min-1. Keywords: adsorption, candlenut, activated carbon, toluene KINETIKA ADSORPSI GAS TOLUENA PADA KARON AKTIF TEMPURUNG KEMIRI ABSTRAK Studi mengenai aspek kinetika adsorpsi toluena pada arang aktif yang terbuat dari tempurung kemiri telah dilakukan. Penelitian dilakukan dengan menguji data adsorpsi yang telah diperoleh pada penelitian terdahulu menggunakan empat persamaan laju adsorpsi, yaitu (1) persamaan laju pseudo order pertama Lagergren, (2) persamaan laju pseudo order kedua Ho, (3) persamaan Elovich, dan (4) persamaan Ritchie. Hasil kajian menunjukkan bahwa model kinetika dengan persamaan laju pseudo order kedua Ho adalah yang paling sesuai diaplikasikan untuk adsorpsi gas toluena pada arang aktif tempurung kemiri. Dari persamaan linear untuk model kinetika pseudo order kedua Ho diperoleh nilai kapasitas adsorpsi pada kesetimbangan sebesar 56,069 mg g-1, konstanta adsorpsi sebesar 3,54x10–4 g mg-1 menit-1, dan laju adsorpsi awal sebesar 1,112 mg g-1 menit-1. Kata kunci: adsorpsi, kemiri, karbon aktif, toluena

THE REDUCTION OF CYTOCHROMEcBY HYDROQUINONE

1963 ◽  
Vol 41 (1) ◽  
pp. 231-237 ◽  
Author(s):  
G. R. Williams
Keyword(s):  
Reaction Mechanism ◽  
Ionic Strength ◽  
Rate Equation ◽  
Second Order ◽  
Order Rate ◽  
Ferricytochrome C ◽  
Kinetics Of ◽  
Kinetics Of Reduction ◽  
Order Rate Equation

The kinetics of reduction of ferricytochrome c by hydroquinone have been studied. The reaction does not conform to a simple second-order rate equation and it is demonstrated that the deviations are brought about by the presence of p-quinone, one of the products of the reaction. The accelerating effect of p-quinone is explained tentatively on the basis of an involvement of the semi-quinone. The effects on the reaction of pH, ionic strength, and temperature are reported and used to suggest features of the reaction mechanism.

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