scholarly journals Fast Recovery of Lead from Hydrochloric Acid via a Novel Silica-Supported Anion Exchange Resin for the Determination of 210Pb in Environmental Samples

2020 ◽  
Author(s):  
Lifeng Chen ◽  
Jie Zhang ◽  
Xianwen He ◽  
Manqing Liu ◽  
Qiuyang Wei ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Environmental Samples ◽  
Adsorption Mechanism ◽  
Exchange Resin ◽  
Separation Efficiency ◽  
Anion Exchange Resin ◽  
Chemical Yield ◽  
Flow Speed ◽  
Exchange Capacity ◽  
Hcl Solution

The<b> </b>measurement of <sup>210</sup>Pb is significant in environmental studies. Lead separation in HCl solution is a vital procedure but suffers from poor efficiency with high labor and time costs. To overcome this problem, a novel anion exchange resin was synthesized and characterized by different techniques followed by studies on the adsorption behaviors towards lead in HCl solution. The results suggest that SiPS-N(CH<sub>3</sub>)<sub>3</sub>Cl was successfully prepared with small particle size, low water swelling rate, and large specific surface area. The maximum anion exchange capacity resulted from quaternary amine groups was determined to be 1.0 mmol (Cl<sup>-</sup>)/g.The adsorption activities reached equilibrium within 3 min under selected conditions offering extremely fast adsorption kinetics. The synergistic adsorption mechanism, the multilayer adsorption mechanism, and the competition from co-existing chloride anions were found to be responsible for the lead adsorption performance of SiPS-N(CH<sub>3</sub>)<sub>3</sub>Cl. Column experiments showed that the feeding volume of lead and HCl had impact on the chemical yield regardless of the co-existence of high concentrations of FeCl<sub>3</sub> (90 mM) and a high flow speed (4.0 mL/min). Based on these results, a separation process integrating SiPS-N(CH<sub>3</sub>)<sub>3</sub>Cl and the matched parameters was finally developed and tested. Our work greatly raised the lead separation efficiency in HCl solutions with implications for measuring <sup>210</sup>Pb in environmental samples.

scholarly journals Fast Recovery of Lead from Hydrochloric Acid via a Novel Silica-Supported Anion Exchange Resin for the Determination of 210Pb in Environmental Samples

2020 ◽  
Author(s):  
Lifeng Chen ◽  
Jie Zhang ◽  
Xianwen He ◽  
Manqing Liu ◽  
Qiuyang Wei ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Environmental Samples ◽  
Adsorption Mechanism ◽  
Exchange Resin ◽  
Separation Efficiency ◽  
Anion Exchange Resin ◽  
Chemical Yield ◽  
Flow Speed ◽  
Exchange Capacity ◽  
Hcl Solution

The<b> </b>measurement of <sup>210</sup>Pb is significant in environmental studies. Lead separation in HCl solution is a vital procedure but suffers from poor efficiency with high labor and time costs. To overcome this problem, a novel anion exchange resin was synthesized and characterized by different techniques followed by studies on the adsorption behaviors towards lead in HCl solution. The results suggest that SiPS-N(CH<sub>3</sub>)<sub>3</sub>Cl was successfully prepared with small particle size, low water swelling rate, and large specific surface area. The maximum anion exchange capacity resulted from quaternary amine groups was determined to be 1.0 mmol (Cl<sup>-</sup>)/g.The adsorption activities reached equilibrium within 3 min under selected conditions offering extremely fast adsorption kinetics. The synergistic adsorption mechanism, the multilayer adsorption mechanism, and the competition from co-existing chloride anions were found to be responsible for the lead adsorption performance of SiPS-N(CH<sub>3</sub>)<sub>3</sub>Cl. Column experiments showed that the feeding volume of lead and HCl had impact on the chemical yield regardless of the co-existence of high concentrations of FeCl<sub>3</sub> (90 mM) and a high flow speed (4.0 mL/min). Based on these results, a separation process integrating SiPS-N(CH<sub>3</sub>)<sub>3</sub>Cl and the matched parameters was finally developed and tested. Our work greatly raised the lead separation efficiency in HCl solutions with implications for measuring <sup>210</sup>Pb in environmental samples.

Study on the Sorption of Rhenium by Anion Exchange Resin

2011 ◽  
Vol 201-203 ◽  
pp. 1821-1824
Author(s):  
Hong Zhou Ma ◽  
Xin Zhe Lan ◽  
Yao Ning Wang
Keyword(s):  
Anion Exchange ◽  
Separation Factor ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Exchange Capacity ◽  
Desorption Rate ◽  
Strong Base ◽  
Loaded Resin ◽  
Result Show ◽  
Leaching Solution

Techniques are applied for the sorption of rhenium from the leaching solution of the fume of calcinating molybdenite concentrate by 201×7 strong base anion exchange resin. By analyzing the main ion from the leaching solution be pretreatmented, the 201×7 strong base anion exchange resin be used in experiment. The influencing factors on the sorption were investigated, with medium pH, the existing form of the ion in the solution and the pH are greatly related to the ion exchange capacity , the result show that the resin not only have higher adsorption rate of ReO4-, but also have higher separation factor of ReO4-and MoO42-when the leaching solution was pretreated pH at 9.0. The separation factor of ReO4-and MoO42-reached to 980.5. 5%NH4OH+9%NH4Cl solution is a effective desorption reagent for molybdenum, the desorption rate is 96% and nitric acid solution is a effective desorption reagent for rhenium on the loaded resin after desorpted the MoO42-,the desorption rate of ReO4-is 98%.

Removal of Dichloroethylene in Water Using a Novel TCAS-Loaded Resin

2013 ◽  
Vol 634-638 ◽  
pp. 334-337
Author(s):  
Miao Miao He ◽  
Xiao Jun Hu ◽  
Yong Biao Peng ◽  
Xin He
Keyword(s):  
Aqueous Solution ◽  
Anion Exchange ◽  
Adsorption Mechanism ◽  
Exchange Resin ◽  
Ph Value ◽  
Anion Exchange Resin ◽  
Operating Temperature ◽  
Removal Rate ◽  
Static Tests ◽  
Loaded Resin

Through the method of the static tests, the removal rate of aqueous dichloroethylene onto a new TCAS-loaded resin was researched. This TCAS-loaded resin was made of a novel supramolecular acceptor compound named thiacalix[4]arenetetrasulfonate(TCAS) and anion exchange resin, and the adsorption mechanism was discussed preliminarily. The results of adsorption indicated that the pH value was an important factor for the removal of dichloroethylene and it would be better for the adsorption if the pH value was greater than 6. The operating temperature should be controlled in 5 to 15°C for the adsorption of dichloroethylene onto TCAS-loaded resin while the removal rate decreased with the temperature increasing and the best time for reaction was 40min. The removal rate of dichloroethylene in aqueous solution was better when 25mL aqueous solution of dichloroethylene (1.0mg/L) was adsorbed by 0.5g TCAS-loaded resin. The dichloroethylene can be resolving and TCAS-loaded resin can be reused.

scholarly journals Selective removal of specific anions using composite carbon electrodes coated with an anion-exchange resin powder

2021 ◽  
Vol 27 (1) ◽  
pp. 200650-0
Author(s):  
Ji-Won Son ◽  
Hyun-Cheul Roh ◽  
Jae-Hwan Choi
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Adsorption Equilibrium ◽  
Anion Exchange Resin ◽  
Ion Selectivity ◽  
Exchange Capacity ◽  
Selective Removal ◽  
Carbon Electrode ◽  
Mixed Solution ◽  
Composite Carbon

The selective removal of specific ions was explored by using a capacitive deionization (CDI) system with a selective composite carbon electrode (SCCE). An SCCE was manufactured by coating a carbon electrode with anion-exchange resin (AER) powders. The correlation between the characteristics of the AERs and ion selectivity was analyzed, and the ion selectivity of the SCCE was verified through CDI experiments with a mixed solution of chloride, nitrate, and sulfate ions. The adsorption equilibrium results of the AERs showed that the ion selectivity of an AER was greatly influenced by its ion-exchange capacity (IEC). The higher the IEC value was, the higher the selectivity for the divalent sulfate ion, whereas the smaller the IEC was, the higher the selectivity for the nitrate ion. The CDI experimental results show that the equivalent fraction of ions adsorbed to the SCCE was consistent with the result of the adsorption equilibrium test. Therefore, the ion selectivity of the SCCE was governed by the ion selectivity of the AER coated on the electrode surface. Notably, as the current density applied to the cell increased, the AER could not maintain an adsorption equilibrium state, which resulted in a decrease in the ion selectivity of the SCCE.

Dynamic Regeneration of D301f Anion Exchange Resin to Remove Nitrate Nitrogen in Wastewater

2011 ◽  
Vol 374-377 ◽  
pp. 1005-1008
Author(s):  
Hong Yan Li ◽  
Shang Ming Li
Keyword(s):  
Anion Exchange ◽  
Exchange Resin ◽  
Nitrate Nitrogen ◽  
Anion Exchange Resin ◽  
Solution Concentration ◽  
Exchange Capacity ◽  
Resin Column ◽  
Regeneration Efficiency ◽  
Regeneration Experiment ◽  
Theoretical Amount

Nitrate nitrogen in wastewater poses serious threat. D301f anion exchange resin can remove nitrate nitrogen in wastewater, its regeneration is one of the most important procedures, because regeneration efficiency has a direct impact on exchange capacity, water quality and regeneration agent consumption. D301f exchange resin column simulated nitrogen fertilizer plant wastewater (nitrate nitrogen300mg/L) for dynamic regeneration experiment. The results showed that, NH4OH regeneration agent dosage selected 3 to 4 times of theoretical amount more reasonable; regeneration solution concentration and temperature separately used 20% and 30°C better.

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