scholarly journals Kinetic Approach for the Adsorption of Organophosphorous Pesticides from Aqueous Solution Using “Waste” Jute Fiber Carbon

2010 ◽  
Vol 7 (s1) ◽  
pp. S511-S519 ◽  
Author(s):  
S. Senthilkumaar ◽  
S. K. Krishna ◽  
P. Kalaamanic ◽  
C. V. Subburamaan ◽  
N. Ganapathy Subramaniam ◽  
...  
Keyword(s):  
Kinetic Models ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Proximate Analysis ◽  
Second Order ◽  
Jute Fiber ◽  
Organophosphorous Pesticides ◽  
First Order ◽  
Pseudo Second Order ◽  
Pseudo First Order

Chemically activated “Waste” Jute Fiber carbon has been effectively used for the removal of five organophosphorous pesticides (malathion, monocrotophos, methylparathion, phosphamidon and dimethoate) from aqueous solutions. The prepared activated jute fiber carbon was characterized by using Elemental analyzer and proximate analysis methods. The adsorption equilibrium was examined at 28ºC. Three different kinetic models, the pseudo first order, pseudo second order and Elovich kinetic models were selected to analyses the adsorption process. To compare the fitness of pseudo first order and pseudo second order, sum of the squares of the errors and correlation coefficient, r2values were calculated. The Elovich model was used to confirm the chemisorptions.

scholarly journals Kinetic study on the removal of heavy metals by Cajanus Cajan husk

2019 ◽  
pp. 206-229
Author(s):  
Mallappa A. Mallappa A. Devania, Mallappa A. Devania ◽  
Basudeb Munshi
Keyword(s):  
Heavy Metals ◽  
Kinetic Model ◽  
Kinetic Models ◽  
Cajanus Cajan ◽  
Second Order ◽  
Order Model ◽  
First Order ◽  
Removal Of Heavy Metals ◽  
Pseudo Second Order ◽  
Pseudo First Order

The removal of heavy metals from wastewater has become crucial to meet safe discharge standards. Development of more economic process has been strived owing to high cost of adsorbents. Thus, biosorption process has become the area of interest to researchers and engineers. The present study has carried out the transient removal of heavy metals from wastewater by both physically treated and chemically modified Cajanus cajan (Pigeon pea) husk (CCH) as novel biosorbents. Work includes five different models such as first order, second order, nth order, first order reversible and second order reversible under the heading of prediction of transient concentration of metal in the solution are used, and under the heading of prediction of transient metal uptake capacity; fractional power, pseudo first order, pseudo second order, second order reversible, Elovich, intra-particle diffusion and film diffusion models are used to analyse the kinetic data. For a metal at any particular initial concentration the best kinetic model with the least RMSE is identified. Pictorial comparison between experimental and pseudo second order and pseudo first order model predictive data of Cd(II) and Cu(II) transient biosorption, respectively onto CCH are illustrated. The trend of the results shows a successful prediction capability of all the kinetic models used in the present work. According to RMSE data, it can be concluded that the best kinetic models are pseudo second order for Cd(II) and pseudo first order for Cu(II). It has been found that the required equilibrium time is always less for the chemically activated than the physically activated sorbent. At 100 mg/L initial metal concentration, pseudo-first-order model has been identified as the best kinetic model for the transient Cu(II) and the best kinetic model for fitting the transient sorption of Cd(II) on CCH is pseudo-second-order. At initial metal concentration of 150 mg/L, initial biosorption rate of 9.7038 for Cd(II) on CCH(N) is greater than 1.4553 for Cu(II) on CCH(N). These indicate that Cd(II) undergoes faster adsorption rate than Cu(II) onto CCH.

Adsorpsi zat organik nitrobenzene dari larutan dengan menggunakan bubuk daun intaran

2018 ◽  
Vol 7 (3) ◽  
pp. 844
Author(s):  
Yentaria Juli Wijaya ◽  
R Rinita ◽  
Felycia Edi Soetaredjo ◽  
Suryadi Ismadji
Keyword(s):  
Adsorption Process ◽  
Low Cost ◽  
Volatile Matter ◽  
Langmuir Equation ◽  
Second Order ◽  
Organic Chemical ◽  
First Order ◽  
Leaf Powder ◽  
Pseudo Second Order ◽  
Pseudo First Order

Nitrobenzene is one of organic compound that usually contained in industrial wastewater, which is toxic. Nitrobenzene can be found in the chemical and pesticides industry. Nitrobenzene, which also known as nitrobenzol, is dangerous organic chemical for organism because can cause death. Organic waste in aqueous solution are usually removed by adsorption. In the adsorption process, adsorbent that usually used are carbon active and organic adsorbent. Neem leaf one of organic adsorbent that effective used in the adsorption process because it has a low cost dan easy to get. In this adsorption process, neem leaf used as a adsorbent. Neem leaf powder characterization with Boehm’s titration and proxymate analysis, which contain moisture content, water content, carbon, and volatile matter. Isoterm adsorption process of  nitrobenzene is appropriated with Freundlich equation and Langmuir equation. And the result of kinetic adsorption is appropriated with pseudo first order and pseudo second order. From the experimenal result, it can be seen that adsorption of nitrobenzene by neem leaf powder is using Langmuir equation in isoterm adsorption and follow pseudo first order in kinetic adsorption.Keywords : Adsorption, neem leaf powder, nitrobenzeneAbstrakNitrobenzene merupakan salah satu zat organik yang biasanya terkandung dalam limbah industri dimana Nitrobenzene sangat sulit diolah sebelum dibuang karena sifatnya yang sangat kompleks. Limbah yang mengandung nitrobenzene ini dapat ditemukan pada industri pestisida, sabun, dan farmasi. Nitrobenzene yang juga disebut nitrobenzol, merupakan bahan kimia organik yang berbahaya bagi mahluk hidup karena dapat menyebabkan kematian. Adsorpsi adalah salah satu cara yang dapat digunakan untuk mengatasi limbah nitrobenzene ini. Dalam proses adsorpsi, bahan penyerap yang umum digunakan adalah karbon aktif dan bahan penyerap organik. Daun intaran merupakan salah satu dari bahan penyerap organik yang efektif digunakan dalam proses adsorpsi karena biayanya yang murah dan mudah didapat. Pada penelitian ini, daun intaran digunakan untuk menyerap zat organik nitrobenzene. Karakterisasi bubuk daun intaran sendiri dilakukan dengan titrasi Boehm dan analisa proximat yang meliputi kandungan abu, air, karbon, dan volatile matter. Proses isoterm adsorpsi nitrobenzene ini disesuaikan dengan persamaan Freundlich dan persamaan Langmuir, sedangkan hasil kinetika adsorpsi disesuaikan dengan menggunakan pseudo first order dan pseudo second order. Dari hasil percobaan, didapatkan hasil bahwa proses adsorpsi nitrobenzene dengan menggunakan bubuk daun intaran ini mengikuti persamaan Langmuir pada isoterm adsorpsinya dan mengikuti persamaan pseudo first order pada kinetika adsorpsinya.Kata Kunci : Adsorpsi, bubuk daun intaran, nitrobenzene

Adsorption of Aniline from Aqueous Solution by KSF Montmorillonite

2011 ◽  
Vol 356-360 ◽  
pp. 208-216
Author(s):  
Jiang Ying Zhang ◽  
Jian Xu ◽  
Yuan Zhang ◽  
Lei Li ◽  
Ying Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Intraparticle Diffusion ◽  
Order Equation ◽  
Second Order ◽  
First Order ◽  
Ph Values ◽  
Whole Process ◽  
Pseudo Second Order ◽  
Pseudo First Order

In the present paper, the adsorption characteristics of aniline onto KSF montmorillonite from aqueous solution were investigated. Experiments were conducted at various pH values, temperatures, ionic strength and surfactant concentrations. Pseudo-first-order, pseudo-second-order and intraparticle diffusion models were adopted to investigate the rate parameters, and the pseudo-second-order equation was proved to be able to successfully predict whole process. Optimal adsorption pH was determined at 3.6. Among the selected models (linear, Langmuir, Freundlich, DR (Dubinin–Radusckevich) models), linear and DR models were found to be better fit the experimental data, which revealed the physisorption nature of the adsorption process. Meanwhile, with the increase of reaction temperatures, the adsorption capacity decreased. The results of the calculated thermodynamic parameters demonstrated that the adsorption was an exothermic, spontaneous and unfavorable process.

scholarly journals Study of the Equilibrium, Kinetics, and Thermodynamics of Boron Removal from Waters with Commercial Magnesium Oxide

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Javier Paul Montalvo Andia ◽  
Lidia Yokoyama ◽  
Luiz Alberto Cesar Teixeira
Keyword(s):  
Kinetic Model ◽  
Magnesium Oxide ◽  
Adsorption Process ◽  
Second Order ◽  
Order Kinetic ◽  
Boron Removal ◽  
First Order ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Pseudo First Order

In the present work, the equilibrium, thermodynamics, and kinetics of boron removal from aqueous solutions by the adsorption on commercial magnesium oxide powder were studied in a batch reactor. The adsorption efficiency of boron removal increases with temperature from 25°C to 50°C. The experimental results were fitted to the Langmuir, Freundlich, and Dubinin–Radushkevich (DR) adsorption isotherm models. The Freundlich model provided the best fitting, and the maximum monolayer adsorption capacity of MgO was 36.11 mg·g−1. In addition, experimental kinetic data interpretations were attempted for the pseudo-first-order kinetic model and pseudo-second-order kinetic model. The results show that the pseudo-second-order kinetic model provides the best fit. Such result suggests that the adsorption process seems to occur in two stages due to the two straight slopes obtained through the application of the pseudo-first-order kinetic model, which is confirmed by the adjustment of the results to the pseudo-second-order model. The calculated activation energy (Ea) was 45.5 kJ·mol−1, and the values calculated for ∆G°, ∆H°, and ∆S° were −4.16 kJ·mol−1, 21.7 kJ·mol−1, and 87.3 kJ·mol−1, respectively. These values confirm the spontaneous and endothermic nature of the adsorption process and indicated that the disorder increased at the solid-liquid interface. The results indicate that the controlling step of boron adsorption process on MgO is of a physical nature.

scholarly journals Egg By-Products as a Tool to Remove Direct Blue 78 Dye from Wastewater: Kinetic, Equilibrium Modeling, Thermodynamics and Desorption Properties

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1262 ◽  
Author(s):  
Ainoa Murcia-Salvador ◽  
José A. Pellicer ◽  
María Isabel Rodríguez-López ◽  
Vicente Manuel Gómez-López ◽  
Estrella Núñez-Delicado ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Advanced Oxidation Process ◽  
Dye Adsorption ◽  
Intraparticle Diffusion ◽  
Second Order ◽  
Waste Material ◽  
First Order ◽  
Direct Blue ◽  
Pseudo Second Order ◽  
Pseudo First Order

Eggshell, a waste material from food manufacturing, can be used as a potential ecofriendly adsorbent for the elimination of textile dyes from water solutions. The adsorption process was evaluated varying factors such as initial dye load, contact time, pH, quantity of adsorbent, and temperature. The initial dye load (Direct Blue 78) was in the range of 25–300 mg/L. The kinetics of adsorption were analyzed using different models, such as pseudo-first-order, pseudo-second-order, and intraparticle diffusion model. Also, the experimental data at equilibrium were studied using Freundlich, Langmuir, and Temkin isotherms. The kinetics followed pseudo-second-order, then pseudo-first-order, and finally the model of intraparticle diffusion. The results obtained for data at equilibrium follow the order: Freundlich > Langmuir > Temkin. The adsorption equilibrium showed a maximum capacity of adsorption (qmax) of 13 mg/g at pH 5, and using 0.5 g of eggshell. Dye adsorption was enhanced with increasing temperatures. The thermodynamic study revealed the spontaneity and endothermic nature of the adsorption process. The desorption study shows that the eggshell could be reused in different adsorption/desorption cycles. A novel advanced oxidation process could degrade more than 95% of the dye. The results show that eggshell is a waste material useful to remove hazardous dyes from wastewater, which may alleviate the environmental impact of dyeing industries.

scholarly journals Adsorption of Cobalt (II) on Layered Double Hydroxides (Mg/Al and Ca/Al) In Aqueous Medium : Kinetic and Thermodynamic Aspect

2018 ◽  
Vol 3 (4) ◽  
pp. 189 ◽  
Author(s):  
Neza Rahayu Palapa ◽  
Tarmizi Taher ◽  
Muhammad Said ◽  
Risfidian Mohadi ◽  
Aldes Lesbani
Keyword(s):  
Layered Double Hydroxides ◽  
Contact Time ◽  
Adsorption Process ◽  
Second Order ◽  
Precipitation Method ◽  
Isotherm Models ◽  
First Order ◽  
Pseudo Second Order ◽  
Pseudo First Order ◽  
Double Hydroxides

Layered double hydroxides Mg/Al and Ca/Al has been synthesized by co-precipitation method with molar ratio M2+:M3+ (3:1) at pH 10. The synthesized materials were characterized by XRD and FTIR. The materials were used as adsorbent for the removal Cobalt (II) in aqueous solution. The adsorption experiments were studied through some variables adsorption such as variation of contact time, variation of temperature and variation of initial concentration. Kinetic parameters was obtained from variation of contact time. Data was analyzed by pseudo-first-order and pseudo-second-order kinetics models in linear analyses. The kinetic studies showed that the adsorption process more fitted by pseudo-second-order than pseudo-first-order based on coefficient correlation. Isotherm parameters was calculated using Langmuir and Freundlich isotherm models. The adsorption process was spontaneous and endothermic.

scholarly journals Harnessing of Newly Tailored Poly (Acrylonitrile)-Starch Nanoparticle Graft Copolymer for Copper Ion Removal via Oximation Reaction

2021 ◽  
Author(s):  
khaled Mostafa ◽  
H. Ameen ◽  
A. Ebessy ◽  
A. El-Sanabary
Keyword(s):  
Experimental Data ◽  
Adsorption Capacity ◽  
Graft Copolymer ◽  
Adsorption Kinetics ◽  
Copper Ions ◽  
Copper Ion ◽  
Second Order ◽  
First Order ◽  
Pseudo Second Order ◽  
Pseudo First Order

Abstract Our recently tailored and fully characterized poly (AN)-starch nanoparticle graft copolymer having 60.1 G.Y. % was used as a starting substrate for copper ions removal from waste water effluent after chemical modification with hydroxyl amine via oximation reaction. This was done to change the abundant nitrile groups in the above copolymer into amidoxime one and the resultant poly (amidoxime) resin was used as adsorbent for copper ions. The resin was characterized qualitatively via rapid vanadium ion test and instrumentally by FT-IR spectra and SEM morphological analysis to confirm the presence of amidoxime groups. The adsorption capacity of the resin was done using the batch technique, whereas the residual copper ions content in the filtrate before and after adsorption was measured using atomic adsorption spectrometry. It was found that the maximum adsorption capacity of poly (amidoxime) resin was 115.2 mg/g at pH 7, 400ppm copper ions concentration and 0.25 g adsorbent at room temperature. The adsorption, kinetics and isothermal study of the process is scrutinized using different variables, such as pH, contact time, copper ion concentration and adsorbent dosage. Different kinetics models comprising the pseudo-first-order and pseudo-second-order have been applied to the experimental data to envisage the adsorption kinetics. It was found from kinetic study that pseudo-second-order rate equation was better than pseudo-first-order supporting the formation of chemisorption process. While, in case of isothermal study, the examination of calculated correlation coefficient (R2) values showed that the Langmuir model provide the best fit to experimental data than Freundlich one.

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