Methodology of isotherm generation: Multicomponent K+ and H+ ion exchange with strong acid cation resin

In the research work, the adsorption equilibrium, kinetics, thermodynamics and dynamic separation of magnesium and calcium ions from industrial wastewater by new strong acid cation resin of SPVC (sulphonated polyvinylchloride) were investigated. The sorption capacity of the studied resin was 3.78 mmol/g and 3.74 mmol/g for magnesium and calcium ions, respectively, according to Langmuir isotherm. It was found that the pseudo−first−order model was better fitted for the adsorption kinetics of magnesium and calcium ions on the resin. The dynamic separation results confirmed that the selected resin effectively separated magnesium and calcium ions from industrial wastewater in the dynamic condition. The change of the standard Gibbs free energy (G) and enthalpy (H), and entropy (S) were calculated. The obtained results confirmed that the adsorption of magnesium and calcium ions on the selected resin is endothermic.

Download Full-text

Adsorption equilibrium, kinetics, and dynamic separation of Ca2+ and Mg2+ ions from phosphoric acid–nitric acid aqueous solution by strong acid cation resin

Chinese Journal of Chemical Engineering ◽

10.1016/j.cjche.2018.12.025 ◽

2019 ◽

Vol 27 (12) ◽

pp. 2930-2936 ◽

Cited By ~ 1

Author(s):

Rui Lü ◽

Qing Xi ◽

Tan Li ◽

Rui Li ◽

Xiaochao Zhang ◽

...

Keyword(s):

Aqueous Solution ◽

Nitric Acid ◽

Phosphoric Acid ◽

Adsorption Equilibrium ◽

Strong Acid ◽

Cation Resin ◽

Acid Cation ◽

Acid Aqueous Solution

Download Full-text

Ion exchange of sodium chloride and sodium bicarbonate solutions using strong acid cation resins in relation to coal seam water treatment

Journal of Water Process Engineering ◽

10.1016/j.jwpe.2016.03.003 ◽

2016 ◽

Vol 11 ◽

pp. 60-67 ◽

Cited By ~ 24

Author(s):

Graeme J. Millar ◽

Sara J. Couperthwaite ◽

Shannon Papworth

Keyword(s):

Sodium Chloride ◽

Water Treatment ◽

Ion Exchange ◽

Coal Seam ◽

Sodium Bicarbonate ◽

Strong Acid ◽

Acid Cation ◽

Bicarbonate Solutions

Download Full-text

Ion exchange between solid phases: material balance and mechanism of interaction of aluminium hydroxide gel in aqueous suspension with a strong acid cation exchange resin

Hydrometallurgy ◽

10.1016/0304-386x(91)90063-r ◽

1991 ◽

Vol 27 (2) ◽

pp. 151-167 ◽

Cited By ~ 3

Author(s):

Tak Ching Wong ◽

A. William ◽

L. Dudeney

Keyword(s):

Ion Exchange ◽

Exchange Resin ◽

Aqueous Suspension ◽

Cation Exchange Resin ◽

Material Balance ◽

Strong Acid ◽

Acid Cation ◽

Mechanism Of Interaction ◽

Solid Phases ◽

Aluminium Hydroxide Gel

Download Full-text

Ion Exchange Functional Nanofibers

MRS Proceedings ◽

10.1557/proc-1240-ww10-03 ◽

2009 ◽

Vol 1240 ◽

Author(s):

Prabir K Patra ◽

Sukalyan Sengupta

Keyword(s):

Ion Exchange ◽

Cation Exchange ◽

Average Diameter ◽

Strong Acid ◽

Weak Acid ◽

Exchange Capacity ◽

Orifice Diameter ◽

Pump Speed ◽

Acid Cation ◽

Weak Base Anion Exchange

AbstractWe have synthesized a series of ion exchange functionalized fibers (IXF) from polystyrene (PS) and polyacrylonitrile (PAN). To obtain strong-acid cation exchange fibers, polystyrene was sulfonated using specific sulfonation protocols. Micron sized fibers (average diameter of 100m) were then produced from the functionalized polystyrene using a single-screw extruder equipped with a 30 hole spinneret with orifice diameter of 0.5 mm with a precise screw speed of 5 rpm, pump speed of 15 rpm, and with a feed rate of 2.4 cc/min. The extruder zone temperature was kept at 250 – 270 °C. Fiber was drawn at 120 degree with a draw ratio of 2. Electrospinning of functionalized polystyrene was also carried out to produce ultrafine functionalized fibers of 100 nm in average diameter. We have also electrospun polystyrene and polyisoprene blended nanofibers to increase the strength of the resulting blend nanofibers compared to pure PS nanofibers. To synthesize weak-acid cation exchange fibers polyacrylonitrile (PAN) was electrospun and the nanofibers obtained were alkaline hydrolyzed with 2 N NaOH for 20 minutes at room temperature to convert nitrile bonds to carboxylate. Cation exchange capacity (CEC) of the microfibers and nanofibers was determined. Sulfonated PS microfibers show high CEC of 4.0 meq/gm compared to that of nanofibers with 2.5 meq/gm. CEC of blended nanofibers of PS and polyisoprene was 2.0 meq/gm. In case of PAN fibers, nanosized electrospun fibers were found to show a CEC of 1.5 meq/gm. Weak-base anion exchange fiber synthesis was undertaken using appropriate protocol and its CEC was measured. For all IXF synthesized, fiber diameter was measured using SEM, degree of functionalization was qualitatively determined using FTIR and ion exchange capacity was computed after mass balance on a binary exchange system after equilibrium.

Download Full-text