scholarly journals Adsorption and Desorption Behavior of Ectoine Using Dowex® HCR-S Ion-Exchange Resin

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 2068
Author(s):  
Yu-Chi Wu ◽  
Yu-Hong Wei ◽  
Ho-Shing Wu
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ph Value ◽  
Ion Exchange Resin ◽  
Intraparticle Diffusion ◽  
Second Order ◽  
Isotherm Models ◽  
Initial Concentration ◽  
Operation Conditions ◽  
Pseudo Second Order

Dowex® HCR-S ion-exchange resin was used to adsorb ectoine in a batch system under varying operation conditions in terms of contact time, temperature, pH value, initial concentration of ectoine, and type of salt. Six adsorption isotherm models (Langmuir, Freundlich, Temkin, Dubinin–Radushkevich, Sips, and Redlich–Peterson) and three kinetic models (pseudo-first-order, pseudo-second-order, and intraparticle diffusion) were used to investigate the ectoine adsorption mechanism of ion-exchange resin. According to the experimental results, the mechanism of ectoine adsorption using an ion exchanger includes the ion-exchange reaction and physisorption. Both the Langmuir and Freundlich models were found to have a high fitting. For the kinetic analysis, the pseudo-second-order and intraparticle diffusion models were suitable to describe the ectoine adsorption. Dowex® HCR-S resin has an average saturated adsorption capacity of 0.57 g/g and 93.6% of ectoine adsorption at 25~65 °C, with an initial concentration of 125 g/L. By changing the pH of the environment using NaOH solution, the adsorbed ectoine on the ion-exchange resin can be desorbed to 87.7%.

Removal of Hexavalent Chromium from Aqueous Solutions by Ion-Exchange Resin

2012 ◽  
Vol 550-553 ◽  
pp. 2333-2337
Author(s):  
Zhen Yu Li ◽  
Shuang Hu
Keyword(s):  
Ion Exchange ◽  
Aqueous Solutions ◽  
Hexavalent Chromium ◽  
Adsorption Process ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Pseudo Second Order ◽  
Order Rate Equation

The adsorption of hexavalent chromium [Cr(VI)] from aqueous solutions using weakly basic ion-exchange resin D301 was studied in this work. The result showed that the adsorption of Cr(VI) was strongly dependent on pH, the optimum condition was investigated at pH 2 and the maximum adsorption capacity was 247.71 mg g-1. The equilibrium datas were fitted well with Langmuir and Redlich–Peterson isotherm models. The pseudo-second-order rate equation was best represented by the adsorption process.

scholarly journals Penyisihan Kontaminan dari Air Limbah Hasil Daur Ulang Baterai LiFePO4 (LFP) Menggunakan Penukar Ion Resin Kation Amberlite HPR1100 Na dan Resin Anion Dowex Marathon A

2021 ◽  
Vol 15 (2) ◽  
pp. 231
Author(s):  
Satryo Dewanto Suryohendrasworo
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Second Order ◽  
First Order ◽  
Pseudo Second Order ◽  
Li Ion ◽  
Pseudo First Order

Pada tahun 2025, diperkirakan kebutuhan baterai Li-ion akan mencapai 400.000 ton. Upaya strategis diperlukan untuk mewujudkan pemakaian baterai Li-ion yang berkelanjutan. Setelah siklus pemakaian baterai Li-ion berakhir, baterai Li-ion akan diproses kembali untuk diambil kandungan logam-logam penting yang terkandung di dalam katoda, terutama litium. Secara umum, proses recycle tersebut dilakukan dengan metode hidrometalurgi yang terdiri atas rangkaian leaching dan presipitasi. Namun demikian, dalam proses pemurnian tersebut dihasilkan air limbah yang mengandung beragam logam dengan konsentrasi yang berbeda. Untuk baterai LFP, logam-logam tersebut berasal dari katoda yang mengandung Li, Na, Si, dan PO4. Proses pelindian dan pencucian serbuk katoda membutuhkan air dalam jumlah yang relatif besar. Pengolahan air limbah hasil proses daur ulang baterai diharapkan dapat secara signifikan meningkatkan efisiensi penggunaan air. Pada eksperimen ini, metode adsorpsi batch dengan ion-exchange resin kation Amberlite HPR1100 Na dan resin anion Dowex Marathon A digunakan untuk menghilangkan ion logam dari air limbah artifisial. Pengambilan sampel air limbah yang diolah diambil pada menit ke-3, 6, 10, 20, 30 dan hari ke-3. Berdasarkan pada hasil removal percentage, diperoleh bahwa pengolahan air limbah artifisial metode adsorpsi dengan menggunakan ion-exchange resin kation Amberlite HPR1100 Na dapat mengurangi kadar ion litium dan natrium sampai 100% pada menit ke-20 dengan variasi dosis adsorben 10 g/100 mL, sedangkan penggunaan ion-exchange resin anion Dowex Marathon A dapat mengurangi kadar ion fosfat sampai 100% pada menit ke-30 dengan dosis adsorben 10 g/100 mL. Dengan adsorpsi isotherm didapat model Langmuir lebih sesuai dengan data eksperimen dengan nilai parameter Qm dan KL untuk ion litium sebesar 1,16 mg/g dan 2,57 mg/g, ion natrium sebesar 74,62 mg/g dan 0,04 mg/gL/mg, dan ion fosfat sebesar 208,33 mg/g dan 0,06 mg/g. Selain itu, studi kinetika menunjukkan bahwa model pseudo second-order memiliki kesesuaian data yang lebih baik daripada pseudo first-order.

A Comparative Study on the Removal of 2,2',4,4'-Tetrabrominated Diphenyl Ether (BDE-47) by Four Different Methods

2014 ◽  
Vol 700 ◽  
pp. 211-215
Author(s):  
Yi Miao Lin ◽  
Ling Yun Li ◽  
Ji Wei Hu ◽  
Ming Yi Fan ◽  
Chao Zhou ◽  
...  
Keyword(s):  
Exchange Resin ◽  
Diphenyl Ether ◽  
Ion Exchange Resin ◽  
Order Equation ◽  
Second Order ◽  
Order Kinetic ◽  
First Order ◽  
Atomic Force ◽  
Phase Reduction ◽  
Pseudo Second Order

The zero-valent iron (ZVI) particles were synthesized by the aqueous phase reduction, and the tapping mode image of atomic force microscope (AFM) showed that the diameter of the ZVI particles was in the range of 90 nm - 400 nm. By comparison of the debromination of BDE-47 by sunlight, ZVI, ZVI impregnated activated carbon (ZVI/AC) and ZVI impregnated ion exchange resin (ZVI/IER), the debromination effect was found to descend in the following order: ZVI/IER > ZVI/AC > ZVI > sunlight. Second order and first order kinetic models were used for the fitting of the debromination data of BDE-47. Results show that the debromination data of BDE-47 by the sunlight, ZVI, ZVI/AC and ZVI/IER in the current study are generally best described by the pseudo first order equation. Meanwhile, the debromination data of BDE-47 by the ZVI and ZVI/IER can also be described by the pseudo second order equation.

scholarly journals Parametric, equilibrium and kinetic studies on the removal of mercury using ion exchange resin

2017 ◽  
Vol 12 (2) ◽  
pp. 305-313 ◽  
Author(s):  
N. Rajamohan ◽  
M. Rajasimman
Keyword(s):  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Strong Acid ◽  
Ion Exchange Resin ◽  
Second Order ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Acid Cation ◽  
Pseudo Second Order ◽  
Langmuir Constants

This experimental research was an investigation into removal of mercury by using a strong acid cation resin, 001 × 7. Parametric experiments were conducted to determine the optimum pH, resin dosage, agitation speed and the effect of change in concentration in the range of 50–200 mg/L. High resin dosages favoured better removal efficiency but resulted in lower uptakes. Equilibrium experiments were performed and fitted to Langmuir and Freundlich isotherm models. Langmuir model suited well to this study confirming the homogeneity of the resin surface. The Langmuir constants were estimated as qmax = 110.619 mg/g and KL = 0.070 L/g at 308 K. Kinetic experiments were modeled using Pseudo second order model and higher values of R2 (>0.97) were obtained. The Pseudo second order kinetic constants, namely, equilibrium uptake (qe) and rate constant (k2), were evaluated as 59.17 mg/g and 40.2 × 10−4 g mg−1 min−1 at an initial mercury concentration of 100 mg/L and temperature of 308 K.

Modified Carbon Nanostructures Obtained From Sugarcane Bagasse Hydrochar for Treating Chromium-Polluted Water

2020 ◽  
Vol 16 ◽  
Author(s):  
Nady A. Fathy ◽  
Sahar M. El-Khouly ◽  
Ola I. El-Shafey
Keyword(s):  
Electron Microscope ◽  
Surface Area ◽  
Functional Groups ◽  
Sugarcane Bagasse ◽  
Carbon Nanostructures ◽  
Intraparticle Diffusion ◽  
Second Order ◽  
Polluted Water ◽  
Initial Concentration ◽  
Pseudo Second Order

Background: Application of nanotechnology in wastewater treatment is the solving key to cope with the conflict between people’s increasing demand for water and the world-wide water shortage. The main goal of this study is to prepare modified carbon nanostructures (CNSs) from sugarcane bagasse waste (SCB) as effective adsorbents for removing toxic Cr(VI) ions from their aqueous solutions. Methods: The preparation of CNSs was performed via catalytic hydrothermal/carbonization of SCB. The resultant CNSs sample was oxidized by oxidation with HNO3/H2O2 (O-CNSs) and then followed by coating with diethylenetriamine (N-CNSs). Transmission electron microscope (TEM), scanning electron microscope attached to energy-dispersive X-ray (SEM/EDX), fourier transform infrared (FTIR) and nitrogen adsorption analyses were used to determine the morphology and surface properties of CNSs. Adsorption and desorption studies of Cr(VI) ions onto these modified CNSs were investigated. Effects of initial concentration of Cr(VI), pH of solution and temperature in batch mode were estimated. Adsorption studies were analyzed by Langmuir, Freundlich and Dubinin-Radushkevich models. Pseudo-first-order, pseudo-second-order and intraparticle diffusion models were undertaken to follow the adsorption mechanism. Results: The prepared samples composed of carbon nanotubes and graphene sheets as evident by TEM and SEM. The adsorption of Cr(VI) is exothermic in nature, well-fitted with Langmuir, described by pseudo-second order kinetic model and then is uncontrolled by intraparticle diffusion step. It was found that the adsorption of Cr(VI) was higher uptake over O-CNSs (56 mg/g) than that by N-CNSs (44 mg/g). This was ascribed to that the first sample is enriched with acidic O-functional groups and possessed higher specific surface area (188 m2/g). Desorption studies were achieved by HNO3 and NaOH reagents for recovering the Cr(VI) from O-CNSs. Results revealed that about 90% of Cr(VI) can be recovered by HNO3 more than that by NaOH till the third run. Conclusions: Two modified CNSs samples were successfully prepared from SCB. Adsorption of Cr(VI) is highly relied on initial concentration of Cr(VI), pH and temperature. The main factors controlling the adsorption behavior of Cr(VI) are the acidic functional groups and the accessible surface area on O-CNSs. Furthermore, the O-CNSs attained high stability in recycling tests for Cr(VI) removal.

Study on Experiments of Ion Exchange Resin Column for Purification of Hydrogen Peroxide

2011 ◽  
Vol 396-398 ◽  
pp. 596-599
Author(s):  
Guo Yan Luan ◽  
Wei Ping Gao ◽  
Ping Jing Yao
Keyword(s):  
Hydrogen Peroxide ◽  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Operating Conditions ◽  
Hydrogen Peroxide Solution ◽  
Pure Hydrogen ◽  
Resin Column ◽  
Aqueous Hydrogen Peroxide ◽  
Operation Conditions

The technologies of ion exchange resin for ultra pure hydrogen peroxide production are more and more focused. The aim of this research was to determine suitable parameters for effective removal of Na+ impurities from aqueous hydrogen peroxide solution to produce ultra pure hydrogen peroxide. Dynamic experiments for the different operation conditions, i.e., initial concentration, flow rate, ratio of height to diameter were carried out. The concentrations of Na+ of the effluents from the ion exchange resin column were determined by ICPS-7510.The breakthrough curves of Na+ were measured and analyzed. The results shown that Na+ could be reduced effectively from the experimental aqueous hydrogen peroxide solution with the fitting conditions of ion exchange resin column, which provided the basis for determining of the suitable operating conditions of ion exchange column of a pilot plant.

scholarly journals Adsorption of Arsenite by Six Submerged Plants from Nansi Lake, China

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Zhibin Zhang ◽  
Yulin Sun ◽  
Cuizhen Sun ◽  
Ning Wang ◽  
Yanhao Zhang
Keyword(s):  
Intraparticle Diffusion ◽  
Second Order ◽  
Pteris Vittata ◽  
Isotherm Models ◽  
Submerged Plants ◽  
Nansi Lake ◽  
Potamogeton Crispus ◽  
Fish Food ◽  
First Order ◽  
Pseudo Second Order

Nansi Lake is the largest and the most important freshwater lake in north China for the South-North Water Transfer Project. Due to long-time and large-scale fish farming of history, the excess fish food and excretion usually release pentavalent arsenic, which is converted into trivalent arsenic (As (III)) in the lake sediment and released into lake water. Adsorption of arsenite using six submerged plants (Mimulicalyx rosulatus,Potamogeton maackianus,Hydrilla,Watermifoil,Pteris vittata, andPotamogeton crispus) as adsorbing materials was investigated. The experimental data obtained have been analyzed using Langmuir, Freundlich, and Dubinin-Radushkevich isotherm models and the pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetics models. According to the results, the As (III) equilibrium data agreed well with the Freundlich isotherm model. The adsorption capacity of the plants was in the following order:Potamogeton crispus>Pteris vittata>Potamogeton maackianus>Mimulicalyx rosulatus>Hydrilla>Watermifoil. The sorption system with the six submerged plants was better described by pseudo-second-order than by first-order kinetics. Moreover, the adsorption withPotamogeton crispuscould follow intraparticle diffusion (IPD) model. The initial adsorption and rate of IPD usingPotamogeton crispusandPteris vittatawere higher than those using other plants studied.

scholarly journals Removal of organic pollutants from polluted drain using a chemically modified aquatic biomass as new nano-biosorbent

2020 ◽  
Author(s):  
Maha Abdallah ◽  
Ahmed Eid Al Prol
Keyword(s):  
Congo Red ◽  
Kinetic Data ◽  
Ph Value ◽  
Xylenol Orange ◽  
Order Equation ◽  
Second Order ◽  
Magnetic Composite ◽  
Initial Concentration ◽  
Equilibrium Data ◽  
Pseudo Second Order

Abstract The production of low-cost adsorbents for the detoxification of industrial effluents has been a growing concern for most environmental researchers. In this study, a magnetic active adsorbent and biomass (Phragmites australis) coated magnetic composite was synthesized and evaluated their effectiveness for the removal of two dyes from industrial polluted drain. In the present study, the biosorption of Congo red and xylenol orange ions from polluted drain discharge in Abu Qir Bay was determined using magnetic biosorbent. The surface function and morphology of the nano-biosorbent were studied by Fourier Transform Infrared analysis and scanning electron microscope imaging. The effect of initial dye concentration, pH, contact time, and concentration of nano-biosorbent has been studied at room temperature.The initial concentration increases as the absorption capacity of Congo red and Xylenol orange increase, especially for an initial concentration lower than 60 and 35 m/L for the two dyes respectively. Maximum percentage removal of Congo red and Xylenol orange by nano biosorbent is 77 and 47 % respectively. A strong dependence of the adsorption capacity on pH was observed, the capacity increase as pH value increase, and the optimum pH value is pH 10 for Congo red and pH 6 for Xylenol orange. Kinetics and adsorption equilibrium were studied for the studied dyes. The adsorption process was fast and the equilibrium was reached within 180 min. The maximum adsorption capacities were 1.88 and 4.62 mg g−1 for Congo red and Xylenol orange respectively. The kinetic data were analyzed using various kinetic models – pseudo-first-order equation, pseudo-second-order equation, and the equilibrium data were tested using several isotherm models, Langmuir, Freundlich, BET, and Tempkin. The pseudo-second-order equation provides the greatest accuracy for the kinetic data and Langmuir model is the closest fit for the equilibrium data.

Removal of Copper Ions from Wastewater by Ion Exchange Resin Using Pulsation Technique

2020 ◽  
Vol 1008 ◽  
pp. 191-201
Author(s):  
Esraa Hashem Abd El-Halim ◽  
Dina Ahmed El-Gayar ◽  
Hasan Farag
Keyword(s):  
Ion Exchange ◽  
Adsorption Isotherms ◽  
Exchange Resin ◽  
Copper Ions ◽  
Copper Ion ◽  
Ion Exchange Resin ◽  
Synthetic Wastewater ◽  
Liquid Volume ◽  
Initial Concentration ◽  
Time Frequency

The rate of removal of heavy metal Copper ion (Cu 2+) from synthetic wastewater was studied using an ion exchange resin and pulsation technique. Variables examined were initial concentration of (Cu 2+), ratio of mass of resin to solution liquid volume, frequency, amplitude and geometry of the disc responsible for the pulsation motion. The results were presented mathematically by using the dimensionless analysis and the mass transfer correlation was obtained also Langmuir and Freundlich adsorption isotherms were examined where the date fits Freundlich adsorption isotherms more than Langmuir adsorption isotherms. It is concluded that percentage of (Cu 2+) removal decreases as initial concentration of (Cu 2+) presented increases and increases with contact time, frequency (rpm), amplitudes and mass of resin per unit volume of solution.

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