Application of superporous magnetic cationic cryogels for persistent chromate (toxic chromate and dichromate) uptake from aqueous environments

Abstract

Poly((3‐Acrylamidopropyl)trimethylammonium chloride) (p(APTMACl)) cryogels were prepared with cryopolymerization technique and employed for the removal of toxic chromate and dichromate anions from aqueous media. The maximum adsorption capacities of 94 mg/g and 135 mg/g for chromate and dichromate anions, respectively, were determined with the application of the Langmuir isotherm. These values are very close to the experimental values of about 77 and 128 mg/g from 100 mL, 100 ppm chromate, and dichromate solutions using 0.03 g cryogel. The removal efficiency of chromate and dichromate anions were increased with the increase in the amount of cryogel and the removal percentage of chromate and dichromate toxic anions were estimated as 99.21 and 93.61%, respectively, for 0.15 g of p(APTMACl) cryogels used in 100 mL, 100 ppm chromate, and dichromate solutions. Furthermore, magnetic p(APTMACl) cryogels were also prepared and used in the removal of chromate and dichromate, and the maximum adsorption capacities were 30 mg/g and 40 mg/g, respectively. Additionally, the adsorption of these anions were investigated from different media such as drinking water, tap water, seawater, and creek water; and the maximum adsorption amounts in drinking water were 65.5 ± 15, and 125.5 ± 11 mg/g for chromate and dichromate anions, respectively. The reusability of p(APTMACl) cryogels for the removal of chromate and dichromate anions was also investigated, and it was found that the adsorption capacity for chromate anions decreased to 71.23 ± 4.3 from 97.37 ± 4.5 mg/g, whereas the adsorption capacity of dichromate anions only decreased to 123.69 ± 3.5 mg/g from 129.9 ± 7 mg/g at the end of five adsorption‐desorption cycles. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43438.

Poly ionic liquid cryogel of polyethyleneimine: Synthesis, characterization, and testing in absorption studies

“…It is obvious that the PEI cryogels have superporous interconnected pore sizes up to a few hundreds of microns . Super porosity in materials provides many advantages such as fast response to exterior stimuli, i.e., solvent, pH, temperature or solute molecules, and may provide high elasticity and high mechanical strength etc., in comparison to common hydrogels .…”

NaOH modified P(acrylamide) hydrogel matrices for in situ metal nanoparticles preparation and their use in H2 generation from hydrolysis of NaBH4

“…We also study the Ni(II) absorption and Ni metal nanoparticle formation within p(AAm) and NaOH‐p(AAm) hydrogel and found that the amount of nickel nanoparticles per gram of NaOH‐p(AAm) hydrogels were determined as 199.95 ± 0.25 mg/g. As Co nanoparticle are known for better catalytic performances in H 2 generation from the hydrolysis of NaBH 4 , NaOH‐p(AAm)‐Co composite hydrogel networks were used in H 2 production reaction in this investigation. The thermal behaviors and the change in metal absorption capacity of hydrogels before and after NaOH modifications were also confirmed via Thermogravimetric Analysis (TGA/DTA‐SII, 6300).…”

Polymeric ionic liquid material‐anchored Mn–porphyrin anion: Heterogeneous catalyst for aerobic oxidation of olefins

“…The stretching band of C─H in the alkyl group appeared at 2963 cm −1 and the band at 1683 cm −1 corresponds to C═O from the amide group. Similarly, the band for N─H bending appeared at 1563 cm −1 , and the band at 1494 cm −1 clearly shows the existence of an ammonium ion . In the FT‐IR spectrum of p(APTMACl)‐[Mn(TPPS)(OAc)] (Figure c), compared to Figure (a), due to interaction between [Mn(TPPS)(OAc)] and hydrogel matrix, a shift of some bands was observed.…”