Preparation of Fe3O4@SiO2@ P(AANa-co-AM) Composites and Their Adsorption for Pb(II)

The hydrogel prepared by graft copolymerization of starch (ST) and acrylamide (AM) is a commonly used absorbent material; however, due to their irregular network structure and a limited number of hydrophilic groups, starch-based hydrogels have poor water absorption and water retention. To overcome this, here, we provide a new preparation method for starch-based hydrogels. Using cerium ammonium nitrate (CAN) as an initiator, the starch–acrylamide–cellulose (CMC)/poly(ethylene glycol) (S-A-M/PEG) superabsorbent hydrogel was prepared by graft copolymerization. The starch–acrylamide–cellulose/poly(ethylene glycol) hydrogel network is constructed through the synergistic effect of hydrogen bonds and chemical bonds. The experimental results showed that the starch–acrylamide–cellulose/poly(ethylene glycol) superabsorbent hydrogel has a complete network structure that does not easily collapse due to its superior mechanical properties. The water swelling rate reached 80.24 times, and it reached 50.61% water retention after 16 days. This hydrogel has excellent water-absorbing and water-retaining properties, biocompatibility, and degradability, making it useful for further studies in medical, agricultural, and other fields.

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“…The binding energy of N–H hardly changed in the three hydrogel samples, which indicates the stability of the formed amide groups. 41 …”

Section: Resultsmentioning

confidence: 99%

Synergistic Effect of Hydrogen Bonds and Chemical Bonds to Construct a Starch-Based Water-Absorbing/Retaining Hydrogel Composite Reinforced with Cellulose and Poly(ethylene glycol)

et al. 2021

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“…It can be clearly seen from the figure that for the two resonance modes, there is a linear relationship between their resonance wavelength and RI. Analyzing the sensitivity (S = ∆λ/∆n) and figure of merit (FOM = S/FWHM) of the two modes can get S 1 = 50 nm/RIU and S 2 = 165 nm/RIU, and FOM 1 = 5 1/RIU and FOM 2 = 83 1/RIU [46][47][48][49][50], respectively. It can be seen that the absorber has a good sensing performance and can be used in refractive index sensors and other fields.…”

Section: Simulations Results and Discussionmentioning

confidence: 99%

Ultra Narrow Dual-Band Perfect Absorber Based on a Dielectric−Dielectric−Metal Three-Layer Film Material

Liu

Zhu

et al. 2021

Micromachines

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This paper proposes a perfect metamaterial absorber based on a dielectric−dielectric−metal structure, which realizes ultra-narrowband dual-band absorption in the near-infrared band. The maximum Q factor is 484. The physical mechanism that causes resonance is hybrid coupling between magnetic polaritons resonance and plasmon resonance. At the same time, the research results show that the intensity of magnetic polaritons resonance is much greater than the intensity of the plasmon resonance. By changing the structural parameters and the incident angle of the light source, it is proven that the absorber is tunable, and the working angle tolerance is 15°. In addition, the sensitivity and figure of merit when used as a refractive index sensor are also analyzed. This design provides a new idea for the design of high-Q optical devices, which can be applied to photon detection, spectral sensing, and other high-Q multispectral fields.

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“…35 The symmetrical and antisymmetric stretching peaks of COO À shifted from 1400.28 and 1629.41 cm À1 to 1400.56 and 1650.75 cm À1 , respectively. 36 The results means that the COO À and CO NH have strong interaction with Pb(II).…”

Section: Characterization Of the C-h-pamamsmentioning

confidence: 92%

The cross‐linked hyperbranched polyamide‐amines: The preparation and its adsorption for Pb(II)

Wang

Zhu

Chen

et al. 2021

J of Applied Polymer Sci

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In order to prepare a new adsorbent material for the treatment of waste water containing Pb(II), hyperbranched polyamide-amines (H-PAMAMs) were prepared via one-pot method, then the H-PAMAMs were crosslinked by epichlorohydrin. The crosslinked hyperbranched polyamide-amines (C-H-PAMAMs)were prepared and characterized. The selective adsorption of coexisting ions shows that the C-H-PAMAMs have high adsorption capacity and selectivity for Pb(II). The adsorption characteristics and mechanism of the C-H-PAMAMs for Pb(II) were systematically investigated. The results of batch adsorption experiments showed that the maximum Pb(II) adsorption capacity was 180.83 mg/g at pH 4.0 and 318 K. The adsorption process on the C-H-PAMAMs was well described by the Langmuir model, which indicated the adsorption process was spontaneous and endothermic. The X-ray photoelectron spectroscopy analysis showed that the adsorption mechanism of the C-H-PAMAMs for Pb(II) was the synergistic chelation of COO and CO NH . Four adsorption/ desorption recycling tests showed that the the C-H-PAMAMs still had a high adsorption capacity for Pb(II).

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Preparation of Fe₃O₄@SiO₂@ P(AANa-co-AM) Composites and Their Adsorption for Pb(II)

Cited by 67 publications

References 38 publications

Synergistic Effect of Hydrogen Bonds and Chemical Bonds to Construct a Starch-Based Water-Absorbing/Retaining Hydrogel Composite Reinforced with Cellulose and Poly(ethylene glycol)

Synergistic Effect of Hydrogen Bonds and Chemical Bonds to Construct a Starch-Based Water-Absorbing/Retaining Hydrogel Composite Reinforced with Cellulose and Poly(ethylene glycol)

Ultra Narrow Dual-Band Perfect Absorber Based on a Dielectric−Dielectric−Metal Three-Layer Film Material

The cross‐linked hyperbranched polyamide‐amines: The preparation and its adsorption for Pb(II)

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