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.

Removal of Cd2+ from Light-Polluted Water by Weak Base Epoxy Anion-Exchange Resin

2012 ◽  
Vol 518-523 ◽  
pp. 2727-2731
Author(s):  
Hong Mei Ma ◽  
Zhi Liang Zhu ◽  
Yong Qian Cheng
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Polluted Water ◽  
Weak Base ◽  
Adsorption Processes ◽  
Rate Kinetics ◽  
Series Of Experiments ◽  
High Concentrations ◽  
Coexisting Ions

This paper presents a study of the removal of trace Cd2+ from light-polluted water by using weak base epoxy anion-exchange resin as adsorbent. A series of experiments was conducted to examine the effects of resin dosage, contacting time and coexisting ions. In the present research, it was found that Cd2+ can be effectively removed from light-polluted water with high concentrations of alkaline and alkaline earth metals by weak base epoxy anion-exchange resin. The adsorption isotherm can be well described by Langmuir isotherm. The adsorption processes followed the first-order rate kinetics.

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.

Separation of Boron from Geothermal Water Using a Boron Selective Macroporous Weak Base Anion Exchange Resin

2010 ◽  
Vol 45 (6) ◽  
pp. 809-813 ◽  
Author(s):  
Idil Yilmaz-Ipek ◽  
Pelin Koseoglu ◽  
Umran Yuksel ◽  
Nazlı Yasar ◽  
Gözde Yolseven ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Geothermal Water ◽  
Weak Base ◽  
Weak Base Anion Exchange

scholarly journals Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 281 ◽  
Author(s):  
Adriana Medina-Ramirez ◽  
Procoro Gamero-Melo ◽  
Beatriz Ruiz-Camacho ◽  
Jesus Isaac Minchaca-Mojica ◽  
Rafael Romero-Toledo ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Process ◽  
Low Cost ◽  
Underground Water ◽  
Ferrous Chloride ◽  
Removal Capacity ◽  
Endothermic Process ◽  
Arsenite Removal ◽  
Ph Range ◽  
Coexisting Ions

The high toxicity of arsenite and the difficulty to remove it is one of the main challenges for water treatment. In the present work the surface of a low cost zeolite was modified by chemical treatment with a ferrous chloride to enhance its arsenite adsorption capacity. The effect of pH, ions coexistence, concentration, temperature and dosage was studied on the adsorption process. Additionally, the Fe-modified W zeolite was aged by an accelerated procedure and the regeneration of the exhausted zeolite was demonstrated. The Fe-modified W zeolite was stable in the pH range of 3 to 8 and no detriment to its arsenite removal capacity was observed in the presence of coexisting ions commonly found in underground water. The studies showed that the adsorption of As (III) on Fe-modified W zeolite is a feasible, spontaneous and endothermic process and it takes place by chemical bonding. The exhausting process proved the adsorption of 0.20 mg g−1 of As (III) by the Fe-modified W zeolite and this withstand at least five aging cycles without significant changes of its arsenite adsorption capacity. Fe-modified W zeolite prepared from fly ash might be a green and low-cost alternative for removal of As (III) from groundwater.

Kinetic modeling and error analysis for zinc removal on a weak base anion exchange resin

2015 ◽  
Vol 57 (41) ◽  
pp. 19510-19518 ◽  
Author(s):  
Emilia Gîlcă ◽  
Andrada Măicăneanu ◽  
Adina Ghirişan ◽  
Petru Ilea
Keyword(s):  
Error Analysis ◽  
Anion Exchange ◽  
Kinetic Modeling ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Weak Base ◽  
Zinc Removal ◽  
Weak Base Anion Exchange
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