scholarly journals Adsorption Properties of Ni(II) by D301R Anion Exchange Resin

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Song Xiuling ◽  
Du Huipu ◽  
Liu Shijun ◽  
Qian Hui
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Freundlich Isotherm ◽  
Isotherm Model ◽  
Bending Vibration ◽  
Freundlich Model ◽  
Diffusion Controlled ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model

The adsorption of Ni(II) with D301R resin was investigated in this paper. The results showed that the saturated extent of adsorption Ni(II) by the resin was 84.3 mg/g. The equilibrium data of Ni(II) sorption was better described by Langmuir isotherm model (r2=0.994) while that of Ni(II) sorption also fitted in Freundlich isotherm model within the experimental concentration range. The amount of the constant (q0) of Ni(II) under 298 K in Langmuir model was 76.92 mg/g, which was close to the experimental results. The constant n was within 2–10 in Freundlich model; it was shown that adsorption of Ni(II) by the resin was easy to take place. The uptake kinetics followed the Lagergren pseudo-first-order rate equation (r2=0.9813). The particle diffusion controlled the adsorption process of Ni(II). The coefficient of the intraparticle diffusion increased with the increase of the pH values and the concentration of Ni(II) in aqueous solution. There was a drop of 20.1 cm−1for the bending vibration frequency of N–H bond. Results showed that the adsorption of Ni(II) by D301R anion exchange resin was the surface complexation through the infrared spectrum analysis.

scholarly journals Removal of Hexavalent Chromium Ions from Aqueous Solutions by an Anion-Exchange Resin

2008 ◽  
Vol 26 (9) ◽  
pp. 693-703 ◽  
Author(s):  
P. Senthil Kumar ◽  
K. Kirthika ◽  
K. Sathish Kumar
Keyword(s):  
Aqueous Solutions ◽  
Anion Exchange ◽  
Hexavalent Chromium ◽  
Exchange Resin ◽  
Ph Value ◽  
Anion Exchange Resin ◽  
Freundlich Isotherm ◽  
Sorption Process ◽  
Isotherm Models ◽  
Exchange Resins

The removal of hexavalent chromium, Cr(VI), from aqueous solutions under different conditions using an anion-exchange resin (AXR) as an adsorbent was investigated under batch conditions. Such studies indicated that the percentage adsorption decreased with increasing initial Cr(VI) concentration, with the maximum removal of such ions occurred at a pH value of ca. 2.0. Both the Langmuir and Freundlich isotherm models were capable of reproducing the isotherms obtained experimentally. The sorption process was rapid during the first 20 min with equilibrium being attained within 30 min. The process followed first-order kinetics. The results demonstrate that such anion-exchange resins can be used for the efficient removal of Cr(VI) ions from water and wastewater.

Synthesis, Characterization and Adsorption Property of Expanded Graphite/Conducting Polymer Composite

2011 ◽  
Vol 322 ◽  
pp. 93-97 ◽  
Author(s):  
Min Cong Zhu ◽  
Wei Qi ◽  
Yan Jie Mao ◽  
Yin Hu ◽  
Xin Qing ◽  
...  
Keyword(s):  
Adsorption Property ◽  
Expanded Graphite ◽  
Freundlich Isotherm ◽  
Reactive Dye ◽  
Isotherm Model ◽  
Freundlich Isotherms ◽  
Pani Composite ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Ir Analysis

In the present work, expanded graphite (EG) was prepared by microwave irradiation. Then, the expanded graphite/polyaniline (EG/PANi) composite was synthesized in the typical method. The samples of EG and EG/PANi were characterized by SEM and IR analysis techniques. Adsorption property of EG/PANi composite for removing the dye, reactive brilliant red K-2BP, from aqueous solution was investigated. The effects of initial dye concentration and contact time, pH, sorbent dosage on the adsorption process were studied. Experimental data were modelled by Langmuir and Freundlich isotherms. Langmuir isotherm model fitted well the equilibrium data for EG/PANi composite comparing to the Freundlich isotherm model. The uptake capacity of EG/PANi for K-2BP was found to be 1.03047 mg/g. The results indicated that EG/PANi composite is not an ideal sorbent used for reactive dye removal.

The Kinetics and Isotherms of Adsorption of Sb(III) from Aqueous Solutions onto the Porous Biomorph-Genetic Composite of Fe2O3/Fe3O4/C with Bamboo Template

2013 ◽  
Vol 394 ◽  
pp. 8-13
Author(s):  
Zong Qiang Zhu ◽  
Shuang Cao ◽  
Wen Hui Wei ◽  
Yi Nian Zhu
Keyword(s):  
Kinetic Curve ◽  
Equilibrium Concentration ◽  
Freundlich Isotherm ◽  
Isotherm Model ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Change Trend ◽  
Kinetics And Isotherms ◽  
Kinetics Of

Static adsorption of Sb (III) on a porous biomorph-genetic composite of Fe2O3/Fe3O4/C (PBGC-Fe/C-B) was studied. The results showed that the kinetic curve of Sb (III) adsorption by PBGC-Fe/C-B had same change trend under initial concentration of 5, 10 and 50 mg/L. The fitting and regression analysis of four kinds of kinetic model indicated that, the adsorption kinetics of Sb (III) by the PBGC-Fe/C-B well follow the pseudo-second-order model (R2>0.9999). At different reaction temperature (25 °C, 35 °C and 45 °C), the adsorption capacity of Sb (III) by PBGC-Fe/C-B both increased with increasing the solution equilibrium concentration. While it showed a declined tendency with temperature increased. The Langmuir isotherm model (R2>0.98) and the Freundlich isotherm model (R2>0.95) had both better fitted with the equilibrium data.

scholarly journals Adsorption of hydrogen fluoride onto activated carbon under vacuum conditions: Equilibrium, kinetic and thermodynamic investigations

2012 ◽  
Vol 18 (4-1) ◽  
pp. 497-508 ◽  
Author(s):  
Hussein Bahrami ◽  
Jaber Safdari ◽  
Ali Moosavian ◽  
Meisam Torab-Mostaedi
Keyword(s):  
Activated Carbon ◽  
Adsorption Process ◽  
Initial Pressure ◽  
Freundlich Isotherm ◽  
Isotherm Model ◽  
Isotherm Models ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Better Than

In this study, the adsorption of HF gas by three types of activated carbon has been investigated under vacuum condition. The effects of experimental parameters such as initial pressure of the HF gas, contact time and temperature on adsorption process have been investigated. The results showed that the adsorption of the HF gas onto activated carbon increased by increasing initial pressure of gas, while it decreased with increase in temperature. The Freundlich isotherm model fitted the equilibrium data better than the other isotherm models. Using Langmuir isotherm model, the maximum adsorption capacities of the first type, the second type and third type of activated carbon were 226.4, 268.8 and 258.9 mg/g, respectively. Experimental data were also evaluated in terms of kinetic characteristics of adsorption and it was found that the adsorption process followed well pseudo-second-order kinetics. Thermodynamic parameters, the change of free energy (?G?), enthalpy (?H?) and entropy (?S?) of adsorption were calculated at the temperature range of 28-55?C. The results showed that the adsorption of HF on activated carbon is feasible, spontaneous and exothermic.

scholarly journals Pore Characteristics and Adsorption Properties of Activated Carbon Produced from Ampelodismos Mauritanicus Stems

2021 ◽  
pp. 156-170
Author(s):  
Amal Benhathat ◽  
Moussa Amrani
Keyword(s):  
Activated Carbon ◽  
Freundlich Isotherm ◽  
Isotherm Model ◽  
Bet Surface Area ◽  
Acid Activation ◽  
Pore Characteristics ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Adsorption Desorption

In this paper, the synthesis and characterization of Ampelodesmos mauritanicus stems activated carbon (AMSAC) were studied. The produced activated carbon by phosphoric acid activation followed carbonisation was characterized by N2 adsorption-desorption isotherm, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) analysis, and Fourier transform infrared (FTIR) spectroscopy. Sorption potential of AMSAC for the removal of methylene bleu from water was investigated. The experimental data found that AMSAC had high Brunauer-Emmett-Teller (BET) surface area of 1293 m2/g and abundant pores with specific volume of 1.23 m3/g. FTIR analysis reveals various functional groups on the surface of AMSAC which can be play an important role for the adsorption process. Langmuir isotherm model fitted well the equilibrium data for the methylene bleu comparing to the Freundlich isotherm model; the monolayer sorption capacity of AMSAC was found to be 411.8 mg/g at 25 °C

Adsorption and Deposition of Cu (II) on Modified Valonia Tannin

2009 ◽  
Vol 620-622 ◽  
pp. 555-558
Author(s):  
Yi Li ◽  
Xue Gang Luo ◽  
Zhao Liu ◽  
Yan Huang ◽  
Xiao Yan Long
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Mannich Reaction ◽  
Langmuir Isotherm ◽  
Freundlich Isotherm ◽  
Heterogeneous Surface ◽  
Isotherm Model ◽  
Maximum Adsorption Capacity ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model

The modified valonian tannin was prepared through sulfonated-mannich reaction and used to adsorb Cu (II) from the aqueous solutions. The adsorption capacity rapidly reached equilibrium within 2 hours. The effect of pH on adsorption was apparent, the amount of adsorption increased significantly as the pH increased from 2.0 to 4.0 and then leveled off at pH 4.0-6.0. Equilibrium data fitted well with Freundlich isotherm model compared to Langmuir isotherm model, indicating that adsorption takes place on heterogeneous surface of the modified valonia tannin. The adsorption capacity was increased by increasing initial concentrations. The maximum adsorption capacity of cooper ion was determined to be 56.200 mg/g at 100 mg/L concentration.

Cr(VI) Removal from Aqueous Solutions by Using Weak Base Epoxy Anion-Exchange Resin as Adsorbent

2012 ◽  
Vol 518-523 ◽  
pp. 2451-2455
Author(s):  
Hong Mei Ma ◽  
Zhi Liang Zhu ◽  
Yong Qian Cheng
Keyword(s):  
Anion Exchange ◽  
Adsorption Process ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Low Cost ◽  
Polluted Water ◽  
Weak Base ◽  
Freundlich Model ◽  
Ph Range ◽  
Coexisting Ions

In this study, 701 weak base epoxy anion-exchange resin was used as a low-cost adsorbent to remove Cr(V) from the light polluted water. To optimize its usage, the influences of pH, contact time, resin dosage and coexisting ions were investigated. Adsorption process was found to be highly pH dependent. The optimum pH range for adsorption of Cr(VI) was found to be between 6 and 8. The necessary time to reach adsorption equilibrium is about 20min. Langmuir and Freundlich adsorption isotherms were applicable to the adsorption process and their constants were evaluated. It was found that the Langmuir model yields a much better fit to the data compared with that of the Freundlich model.

PEMODELAN MATEMATIS ADSORPSI CO2 DENGAN STRONG BASE ANION EXCHANGE RESIN SEBAGAI ADSORBEN UNTUK PURIFIKASI BIOGAS

2015 ◽  
Vol 5 (1) ◽  
pp. 11
Author(s):  
Anies Mutiari ◽  
Wiratni Wiratni ◽  
Aswati Mindaryani
Keyword(s):  
Anion Exchange ◽  
Pilot Plant ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Scale Up ◽  
Sum Of Squares ◽  
Strong Base ◽  
Model Transfer ◽  
Plant Parameter

Pemurnian biogas telah banyak dilakukan untuk menghilangkan kadar CO2  dan meningkatkan kandungan CH4  yang terkandung di dalamnya. Kandungan CH4 yang tinggi akan memberikan unjuk kerja yang lebih baik. Model  matematis proses adsorpsi CO2 disusun berdasarkan teori lapisan film antar fasa, dimana pada proses yang ditinjau terdapat tiga fase yaitu gas, cair dan padat. Model matematis dari data eksperimental   kecepatan dan kesetimbangan proses adsorpsi CO2 melalui mekanisme pertukaran ion di suatu kolom adsorpsi telah dibuat. Model ini dibuat untuk mencari konstanta yang dapat dipergunakan pada proses scale up data laboratorium ke skala pilot plant. Parameter proses kecepatan yang dicari nilainya adalah koefisien transfer massa massa volumetris CO2 pada fase cair (kLa), koefisien transfer massa volumetris CO2 pada fasegas (kGa) dan tetapan laju reaksi (k1 dan k2). Pada hasil penelitian ini ditunjukkan bahwa nilai parameter yang diperoleh sesuai hasil fitting data dengan model matematis yang digunakan, yaitu model transfer massa pada lapisan film antar fase secara seri: adalah kGa, kla, k1 dan k2  dengan nilai Sum of Squares Error (SSE) rata-rata 0,0431. Perbandingan nilai kGa hasil simulasi dan teoritisnya memberikan kesalahan rata-rata 18,79%. Perbandingan nilai kLa hasil simulasi dan teoritis memberikan kesalahan rata-rata 7,92%.Kata kunci: model matematis, adsorpsi CO2, pemurnian biogas

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