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 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 Removal of uranium(VI) from aqueous solution by Camellia oleifera shell-based activated carbon: adsorption equilibrium, kinetics, and thermodynamics

2020 ◽  
Vol 82 (11) ◽  
pp. 2592-2602
Author(s):  
Zhengji Yi ◽  
Jian Liu ◽  
Rongying Zeng ◽  
Xing Liu ◽  
Jiumei Long ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Contact Time ◽  
Adsorption Process ◽  
Intraparticle Diffusion ◽  
Camellia Oleifera ◽  
First Order ◽  
Pseudo Second Order ◽  
Camellia Oleifera Shell ◽  
Pseudo First Order

Abstract Camellia oleifera shell-based activated carbon (COSAC) was prepared by H3PO4 activation method and further used to remove U(VI) from the aqueous solution in a batch system. This research examined the influence of various factors affecting U(VI) removal, including contact time, pH, initial U(VI) concentration, and temperature. The results showed that the U(VI) adsorption capacity and removal efficiency reached 71.28 mg/g and 89.1% at the initial U(VI) concentration of 160 mg/L, temperature of 298 K, pH 5.5, contact time of 60 min, and COSAC dosage of 2.0 g/L. The pseudo-first-order, pseudo-second-order, and intraparticle diffusion equations were used to identify the optimum model that can describe the U(VI) adsorption kinetics. The pseudo-second-order kinetics model performed better in characterizing the adsorption system compared with the pseudo-first-order and intraparticle diffusion models. Isotherm data were also discussed with regard to the appropriacy of Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich models. The Langmuir model described the U(VI) adsorption process the best with a maximum adsorption capacity of 78.93 mg/g. Thermodynamic analysis (ΔG0 < 0, ΔH0 > 0, and ΔS0 > 0) indicated that the U(VI) adsorption process is endothermic and spontaneous. All the results imply that COSAC has a promising application in the removal or recovery of U(VI) from aqueous solutions.

Kinetics of Glyphosate Adsorption on Composite Resin from Aqueous Solution

2013 ◽  
Vol 803 ◽  
pp. 157-160
Author(s):  
Zhen Zhen Kong ◽  
Dong Mei Jia ◽  
Su Wen Cui
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Composite Resin ◽  
Order Equation ◽  
Second Order ◽  
First Order ◽  
Basic Resin ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Best Fit

The composite weakly basic resin (D301Fe) was prepared and examined using scanning electron microscopy and Fourier transform infrared spectroscopy. The adsorption kinetics of glyphosate from aqueous solution onto composite weakly basic resin (D301Fe) were investigated under different conditions. The experimental data was analyzed using various adsorption kinetic models like pseudo-first order, the pseudo-second order, the Elovich and the parabolic diffusion models to determine the best-fit equation for the adsorption of glyphosate onto D301Fe. The results show that the pseudo-second order equation fitted the experimental data well and its adsorption was chemisorption-controlled.

scholarly journals Removal of Fluoride Ion from Water Using locally Produced Adsorbent

2019 ◽  
Vol 4 (12) ◽  
pp. 78-85
Author(s):  
Aboiyaa A. Ekine ◽  
Patience N. Ikenyiri ◽  
O. Hezekiah-Braye
Keyword(s):  
Particle Size ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Process ◽  
Intraparticle Diffusion ◽  
Fluoride Ion ◽  
First Order ◽  
Egg Shells ◽  
Pseudo Second Order ◽  
Pseudo First Order

This Research investigated the adsorption capacity of locally prepared adsorbents from Egg shells for the removal of fluoride ion in well water. It evaluated the performance of these adsorbents calcinated at 3000C and modified with 1.0M HNO3 (trioxonitrate (v)) acid. Batch adsorber was used to allow for interaction between adsorbent (grounded Egg shells) with water containing fluoride ion. The batch experiment was performed with particle size of 2.12 contact time (60, 120, 180, 240, 300min), mass dosage (5g, 10g, 15g, 20g) and temperature (250C, 300C, 400C, 500C). The modified adsorbent was characterized to determine the physiochemical properties of grounded Egg shells (GE). Also the chemical composition of the modified adsorbent was analyzed to determine the percentage of calcium element required for the uptake of the fluoride ions in water for calcium as 39.68% for grounded Egg shells (GE). Percentage adsorption increased with increase in contact time, mass dosage and temperature for the adsorbent. The adsorption capacity was also determined which also increased with increase in contact time, temperature but decreased with increase in mass dosage at constant time of 60minutes. The pseudo first-order, pseudo second order and intraparticle diffusion kinetic models were fitted into the experimental results. The results obtained indicated that the pseudo first order and intraparticle diffusion models for the grounded Egg shells (GE) reasonably described the adsorption process very well whereas the pseudo second order model was not suitable for a calcinations temperature of 3000C and particle size of 2.12m. The adsorption isotherms were obtained from equilibrium experiment Performed at temperature of 25, 35, 45 and 550C. The result showed that Langmuir and Freundlich isotherm fitted perfectly the experimental data. However, the negative values of Gibb’s free energy indicated that adsorption was favourable and the positive enthalpy change H0 revealed that adsorption process was endothermic while the positive value of the entropy change signified increased randomness with adsorption.

Thermodynamic and kinetic properties of the adsorption of 4-nitrophenol on graphene from aqueous solution

2015 ◽  
Vol 93 (10) ◽  
pp. 1083-1087 ◽  
Author(s):  
Ali Issa Ismail
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Kinetic Properties ◽  
Initial Concentration ◽  
First Order ◽  
Toxic Materials ◽  
Exothermic Process ◽  
Pseudo Second Order ◽  
Pseudo First Order

Graphene is a newly discovered material and is considered to be the new wonder material for many applications. The recent possibility of obtaining pure and fully characterized graphene opens the door to the study of the adsorption of toxic materials on graphene. The adsorption behavior of p-nitrophenol on graphene was studied in aqueous medium. The effect of each of pH, temperature, and dosage was emphasized. The highest calculated adsorption capacity of 4-nitrophenol was found to be 15.5 mg/g, assuming Langmuir fitting starting from 11.1 mg/g initial concentration at 298 K and pH = 6. Fitting the data using the Freundlich isotherm model predicted a favorable adsorption process (n > 1). The rise and saturation areas of the isotherms were fitted as pseudo first-order and pseudo second-order processes, respectively, with relatively good fit (k1 = 0.0023/s, k2 = 0.68 g mg−1 s−1). The thermodynamic properties indicated a spontaneous and exothermic process.

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

scholarly journals Comparative Study on Adsorptive Characteristics of Diazinon and Chlorpyrifos from Water by Thermosensitive Nanosphere Polymer

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Faranak Pishgar ◽  
Homayon Ahmad Panahi ◽  
Ali Akbar Khodaparast Haghi ◽  
Vahid Motaghitalab ◽  
Amir Hesam Hasani
Keyword(s):  
Kinetic Data ◽  
Contact Time ◽  
Adsorption Process ◽  
Intraparticle Diffusion ◽  
Initial Concentration ◽  
Intraparticle Diffusion Model ◽  
First Order ◽  
Removal Capacity ◽  
Pseudo Second Order ◽  
Pseudo First Order

Diazinon and chlorpyrifos are two common organophosphorus poisons to fight the pests in Iran. The removal of these poisons from water by thermosensitive nanosphere polymer (TNP), synthesized from the copolymerization of N-isopropylacrylamide and 3-allyloxy-1,2-propanediol, was investigated. The effect of pH, contact time, and the initial concentration on the removal amount was studied. The highest removal amount of these poisons by TNP occurred at pH 7. The contact time increase improves the removal amount and the equilibrium contact time for diazinon and chlorpyrifos was 10 and 18 min, respectively. For low concentration of less than 50 mgL−1it was shown that removal capacity remains above 95%. The initial concentration above 50 mgL−1decreased the removal amount, in which chlorpyrifos showed a greater decrease. The kinetic data has been checked using pseudo first-order, pseudo second-order, and intraparticle diffusion equations. The intraparticle diffusion model had the best conformability for the adsorption process.

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 The Kinetics of the Adsorption Process of Cr (VI) in Aqueous Solution Using Neem Seed Husk (Azadirachta indica) Activated Carbon

2020 ◽  
pp. 1-13
Author(s):  
A. A. Danmallam ◽  
W. L. Dabature ◽  
N. Y. Pindiga ◽  
B. Magaji ◽  
M. A. Aboki ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Adsorption Process ◽  
Neem Seed ◽  
First Order ◽  
Pseudo Second Order ◽  
Seed Husk ◽  
Pseudo First Order ◽  
Kinetics Of ◽  
Adsorbent Dose

The aim of this research is the study of physico-chemical properties activated carbon prepared from agricultural by product such as Neem Seed Husk (NSH) which is abundantly available in our environment The Activated Carbon (AC) was prepared using H3PO4 as activating agent and carbonized at 300°C for two hours. The results shows that the activated process was successful and can compete favorably with commercial activated carbon. The prepared activated carbon was characterized using Fourier Transform Infrared Spectrophotometer (FT-IR), Scanning Electron Microscopy (SEM), Energy Dispersion X-ray (EDX) and Thermogravimetric Analysis (TGA). The percentage removal of Cr(VI) increased with increase in process parameters such as adsorbent dose, time and temperature while there was a decrease with increase in pH and Initial concentration. It was established from the results that activated carbon produced from Neem seed husk has adsorption capacity which could remove 99.75% Cr (VI) at optimum process conditions (pH-2.0, Cr(VI) concentration-10 mg/L, adsorbent dose 0.5 g/L, Temperature 70 c and contact time 30 mins.). Thus, the adsorption method using activated carbon produced from biomass was used effectively for removing Cr(VI) in a stock solution, seems to be an economical and worthwhile alternative over other conventional methods, because of it availability, low price and multi-purposes. The adsorption data fitted well into Freundlich and Langmuir with correlation coefficient (R2) 0.9522 and 0.9403 respectively. The kinetics of the adsorption process was tested through pseudo-first-order and pseudo-second-order models. The pseudo-second-order kinetic model provided the best correlation for with (R2) 0.993, while the pseudo-first-order was found to be 0.928. The study provided an effective use of low-cost activated carbon as a valuable source of adsorbents for the removal of Cr(VI) ions from aqueous solution.

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.

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