Facile synthesis and characterization of thermo-magneto-responsive poly(N-isopropylacrylamide)-magnetite composite hydrogel and its adsorption-desorption study on chromium (III)

Chen, J.J.; Ahmad, Abdul Latif; Lim, JitKang; Ooi, Boon Seng

doi:10.1016/j.matchemphys.2018.07.008

Cited by 13 publications

(3 citation statements)

References 67 publications

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“…Chen et al reported successfully synthesizing a thermo-magneto-responsive poly (N-isopropyl acrylamide)-magnetite composite hydrogel and its adsorption of Cr 3+ occurred primarily in the temperature range of 25-50 • C. When the temperature dropped below 25 • C, desorption of Cr 3+ turned out to be the prevailing process. The maximum adsorption efficiency was achieved as 60.9% when the initial concentration of Cr 3+ was 20 mg•L −1 [17].…”

Section: Introductionmentioning

confidence: 94%

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Cassava Starch-Based Thermo-Responsive Pb(II)-Imprinted Material: Preparation and Adsorption Performance on Pb(II)

Zhang

et al. 2022

Polymers

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Heavy metal pollution is currently an increasing threat to the ecological environment, and the development of novel absorbents with remarkable adsorption performance and cost-effectiveness are highly desired. In this study, a cassava starch-based Pb(II)-imprinted thermo-responsive hydrogel (CPIT) had been prepared by using cassava starch as the bio-substrate, N-isopropyl acrylamide (NIPAM) as the thermo-responsive monomer, and Pb(II) as the template ions. Later, a variety of modern techniques including FTIR, DSC, SEM, and TGA were employed to comprehensively analyze the characteristic functional groups, thermo-responsibility, morphology, and thermal stability of CPIT. The obtained material exhibited superior performance in adsorption of Pb(II) and its maximum adsorption capacity was high—up to 114.6 mg/g under optimized conditions. Notably, the subsequent desorption (regeneration) process was fairly convenient by simply rinsing with cold deionized water and the highest desorption efficiency could be achieved as 93.8%. More importantly, the adsorption capacity of regenerated CPIT still maintained 88.2% of the value of starting material even after 10 recyclings. In addition, the excellence of CPIT in selective adsorption of Pb(II) should also be highlighted as its superior adsorption ability (97.9 mg/g) over the other seven interfering metal ions.

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Section: Introductionmentioning

confidence: 94%

“…When the temperature dropped below 25 °C, desorption of Cr 3+ turned out to be the prevailing process. The maximum adsorption efficiency was achieved as 60.9% when the initial concentration of Cr 3+ was 20 mg·L −1 [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Cassava Starch-Based Thermo-Responsive Pb(II)-Imprinted Material: Preparation and Adsorption Performance on Pb(II)

Zhang

et al. 2022

Polymers

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“…The presence of magnetite characteristic peak at 850 cm −1 (Fe-O lattice vibrations [23]) in FTIR spectrum of PMNC/1MN-L sample (which did not exist in FTIR spectrum of PMNC/0MN-L sample) was the conformation of the MN presence (Fig. 1.…”

Section: Characterization Of Pmnc/mn-l Samplesmentioning

confidence: 99%

Dual responsive hybrid hydrogels for controlled release of local anesthetic

Markovič

Šešlija

Panic

et al. 2022

procteh

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Inteligent hydrogels, such as pH sensitive hydrogels based on poly(methacrylic acid) (PMAA) are widely used for targeted drug delivery. Still, PMAA lack of good mechanical properties often limits its application. In order to overcome this limitation nanocellulose (NC) was extracted from wood waste material and then added to PMAA because NC is biocompatible, non-toxic and has excellent mechanical properties. Further, carboxymethyl cellulose (CMC) (cellulose derivate widely used for controlled release of drugs) was added. CMC can stabilize magnetite nanoparticles (MN) which is then also added. MN can significantly improve mechanical properties of hydrogels and also possess magnetic properties due to which MN can be used for targeted drug delivery. The as-prepared material can protect drug, deliver it to the site of action, control its release rate and enable in that way its efficient application with reduced side effects. Local anesthetic - lidocaine hydrochloride (LH) is often administrated by injection which can induce severe side effects. This problem is solved in present study by encapsulating LH into hydrogels based on PMAA, NC, CMC and MN (PMNC/MN-L). PMNC/MN-L hydrogels were characterized by FTIR and SEM spectroscopies and single compressive tests and then their swelling behavior and LH release were analyzed. Present study offers unique approach for green synthesis of dual responsive hydrogels with improves properties and their application for controlled release of local anesthetic with reduced side effects.

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