Preparation of polyacrylamide–montmorillonite nanocomposite and its application in Cr(III) adsorption

Qiu, Jinghong; Du, Xiaosheng; Komarneni, Sridhar; Wang, Haibo; Cheng, Xu; Du, Zongliang

doi:10.1002/app.49065

Cited by 7 publications

(4 citation statements)

References 34 publications

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“…The adsorption kinetic model of GM and MGM for phosphorus was analyzed by the quasi-first-order kinetic model (Formula (2)), quasi-second-order kinetic model (Formula (3)), and intraparticle diffusion model (Formula (4)) [25, 26]. (2) ln q e − q = ln q e − k 1 t , (3) t q = 1 k 2 q e 2 + t q e , (4) q t = k 3 t 1 / 2 + C , where t was the reaction time (h); q t was the adsorption capacity of GM and MGM on phosphorus (mg/g) at different times; and k 1 , k 2 , and k 3 were the rate constants of the quasi-first-order kinetic model, quasi-second-order kinetic model, and intra-particle diffusi...…”

Section: Methodsmentioning

confidence: 99%

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Study on Phosphorus Adsorption Performance of Inorganic Modified Green Mudstone

Shi

Xiong

et al. 2023

Adsorption Science & Technology

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Inorganic modified green mudstone (MGM) was prepared from the green mudstone (GM) residue of Fushun West Open Pit Mine and characterized by XRF, XRD, FTIR, and SEM of GM and MGM. According to the calculation of pore size and the BET equation, the pore size and specific surface area of the MGM were larger. The results of adsorption kinetics and isothermal adsorption experiments showed that the adsorption capacity of MGM for phosphate increased from 0.1 mg/g to 0.71 mg/g, which was obviously better than that of GM. The GM and MGM accorded with the quasi-second-order kinetic model. The isothermal adsorption data of GM accorded with the Freundlich model, and the isothermal data of MGM accorded with the Langmuir model, which indicated that the model of GM and MGM was an adsorption process from a double layer to a single layer. Thermodynamic data showed that the increase in temperature was beneficial to the adsorption of MGM. The internal diffusion model showed that due to the change of pore size structure after modification, the number of adsorption sites that could provide phosphate was increased, and at the same time, the change of internal elements led to the extension of the chemical reaction time by 700 min. Because of the ligand exchange and electrostatic interaction between phosphate, GM, and MGM, the adsorption results showed that acidity was better than alkalinity. To improve the recycling ability of MGM, hydrochloric acid with a concentration of 0.1 mol/L was determined as the best phosphorus resolving agent, and the resolving rate was still close to 80% after five cycles. The results showed that the MGM could be a promising adsorbent for the removal of phosphorus, providing a new way for resource utilization of mining waste residue.

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Section: Methodsmentioning

confidence: 99%

Section: Adsorption Science and Technologymentioning

confidence: 99%

Study on Phosphorus Adsorption Performance of Inorganic Modified Green Mudstone

Shi

Xiong

et al. 2023

Adsorption Science & Technology

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“…[38,39] Qiu et al prepared a nanocomposite of polyacrylamide (pAAm) and MMT and used it as an adsorbent of chromium(III). [40] Ma et al investigated the physicochemical properties of nanocomposite hydrogels composed of pAAm with MMT and their ability to bind and release ozone. [41] Khan et al synthesized polyacrylamide/bentonite hydrogel and applied it to lead and cadmium (Cd) ions removal from aqueous media.…”

Section: Introductionmentioning

confidence: 99%

“…Qiu et al. prepared a nanocomposite of polyacrylamide (pAAm) and MMT and used it as an adsorbent of chromium(III) [40] . Ma et al.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Structural, Water‐Retaining and Sorption Properties of Acrylamide‐Based Hydrogels Cross‐Linked by Physical and Chemical Methods

Siryk,

Goncharuk,

Samchenko

et al. 2024

ChemPhysChem

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Two series of hydrogels based on acrylamide and its copolymers with acrylonitrile and acrylic acid were synthesized by two cross‐linking methods – chemical (using N,N′‐methylene bis‐acrylamide) and physical (using montmorillonite (MMT)) ones. The structure of the gels was characterized by Fourier Transform Infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The swelling and sorption properties were analyzed as a function of both the monomer composition and the cross‐linking method. The shift of the band corresponding to Si−O (995–1030 cm−1) confirmed the formation of intercalation structures for MMT‐cross‐linked gels. Moreover, physically cross‐linked gels demonstrated a non‐monotonic dependence of the swelling degree on the MMT concentration, and acrylamide‐acrylic acid copolymer MMT‐cross‐linked gels showed pH sensitivity and the highest swelling degree of 150 g/g. The highest sorption capacity towards cadmium(II) ions was demonstrated by acrylamide‐acrylic acid copolymer gels, both covalently cross‐linked (30 mg/g) and MMT‐cross‐linked (8.9 mg/g).

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Structure and thermal properties of acrylic copolymer gels: effect of composition and cross-linking method

Sternik,

Szewczuk-Karpisz,

Siryk

et al. 2024

J Therm Anal Calorim

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Two approaches to the synthesis of hydrogels based on polyacrylamide (pAAm) with copolymers were compared in the paper—traditional chemical cross-linking and physical cross-linking with montmorillonite (MMT). The main aim of the work was to find an adequate replacement of the chemical toxic cross-linking agent MBAAm (N,N'-methylene-bis-acrylamide) by using non-toxic—natural clay MMT for synthesis of pAAm gels, which are planned to be used as soil conditioners. A series of hydrogels based on acrylic monomers (acrylamide (AAm), acrylonitrile (AN), acrylic acid (AA)) physically cross–linked by MMT and chemically cross-linked were synthesized. For the synthesized gels, the influence of the synthesis method on the formation of the structure and the mechanism of thermal destruction in the presence of air was analyzed using a set of physicochemical methods: FTIR, XRD, SEM, DSC and TG/DTG. According to FTIR and XRD data, pAAm-MMT and pAAm-AN-MMT samples formed an intercalated/exfoliated structure, whereas pAAm-AA-MMT had an intercalated structure. The endothermic reaction of decomposition of xerogels based on acrylic polymers with and without MMT was observed using DSC and derivative thermogravimetry analyses, coupled with measurement of FTIR spectra of volatile products of thermolysis. All studied composites were relatively thermoresistant, which had three distinct regions of phase transitions and their thermal decomposition occurred at a temperature range 310–465 °C. Graphical Abstract

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Preparation of polyacrylamide–montmorillonite nanocomposite and its application in Cr(III) adsorption

Cited by 7 publications

References 34 publications

Study on Phosphorus Adsorption Performance of Inorganic Modified Green Mudstone

Study on Phosphorus Adsorption Performance of Inorganic Modified Green Mudstone

Comparison of Structural, Water‐Retaining and Sorption Properties of Acrylamide‐Based Hydrogels Cross‐Linked by Physical and Chemical Methods

Structure and thermal properties of acrylic copolymer gels: effect of composition and cross-linking method

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