Carboxymethyl cellulose/polyacrylamide composite hydrogel for cascaded treatment/reuse of heavy metal ions in wastewater

Godiya, Chirag B.; Cheng, Xiao; Li, Dawei; Chen, Zhan; Lü, Xiaolin

doi:10.1016/j.jhazmat.2018.09.076

Cited by 363 publications

(151 citation statements)

References 51 publications

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“…Carboxymethyl cellulose (CMC) is a degradation and biocompatibility biomass material containing a large amount of carboxyl oxygen and lone pair electrons in coordinated bonds that form chelates with metal ions [19][20][21]. Chen et al [22] produced a bio-based adsorbent consisting of polyacrylamide, polyacrylic acid, and CMC (CMC-PAMA) by the thermal crosslinking of sodium carboxymethylcellulose, polyacrylic acid, and polyacrylamide with good stability and recyclability, whose static adsorption capacities for methylene blue (MB) and Pb(II) were, respectively, 1611.44 mg•g −1 and 840.11 mg•g −1 .…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Optimization of the Thermo-Sensitive Hydrogel Carboxymethyl Cellulose/Poly(N-isopropylacrylamide-co-acrylic acid) for U(VI) Removal from Aqueous Solution

et al. 2020

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In this work, the thermo-sensitive materials N-isopropylacrylamide (NIPAM) and acrylic acid (AA) were crosslinked with carboxymethyl cellulose (CMC) (CMC/P (NIPAM-co-AA)) via a free radical polymerization method for the removal of U(VI) from aqueous solution. The L16 (45) orthogonal experiments were designed for the optimization of the synthesis condition. The chemical structures of the crosslinking hydrogel were confirmed by FTIR spectroscopy. The microstructural analyses were conducted though scanning electron microscopy (SEM) to show the pore structure of the hydrogel. The adsorption performance of the CMC/P (NIPAM-co-AA) hydrogel for the uptake of U(VI) from simulated wastewater was also investigated. The adsorption reached equilibrium within 1 h. Under the reaction of pH = 6 and a temperature of 298 K, an initial concentration of U(VI) of 5 mg·L−1, and 10 mg of the CMC/P(NIPAM-co-AA) hydrogel, the maximum adsorption capacity was 14.69 mg g−1. The kinetics fitted perfectly with the pseudo-second-order model, and the isotherms for the composite hydrogel adsorption of U(VI) was in accordance with the Langmuir model. The chemical modification confirmed that the acylamino group played an important role in uranium adsorption. The desorption and reusability study revealed that the resolution rate was still available at approximately 77.74% after five alternate heating cycles at 20 and 50 °C of adsorption-desorption.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Optimization of the Thermo-Sensitive Hydrogel Carboxymethyl Cellulose/Poly(N-isopropylacrylamide-co-acrylic acid) for U(VI) Removal from Aqueous Solution

et al. 2020

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“…In addition, PAM‐g‐CMC is a candidate for the treatment of coal mine wastewater, via the flocculation process . Finally, a new composite hydrogel of CMC and PAM was prepared for the waste water remediation …”

Section: Introductionmentioning

confidence: 99%

Characterization, optical, and nanoscale free volume properties of Na‐CMC/PAM/CNT nanocomposites

Awad

El‐Gamal

Sayed

et al. 2019

Polymers for Advanced Techs

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Polyblend and nanocomposite films of sodium salt of carboxymethylcellulose (Na‐CMC)/polyacrylamide (PAM) and Na‐CMC/PAM modified with carbon nanotubes (CNT) were synthesized by the solution casting technique. The effect of PAM and CNT loading on the structural, optical, and nanoscale free volume properties of Na‐CMC was studied. X‐ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy exhibited the existence of strong interactions between Na‐CMC and PAM and the non‐destructive effect of CNT on Na‐CMC/PAM structure. The HR‐TEM revealed the multi‐walled structure of CNT with a 7.06‐nm wall thickness and a 6.92‐nm wall inner diameter. Positron annihilation lifetime spectroscopy (PALS) was done, in a vacuum and at 30°C to 200°C, to investigate the nanoscale free volume properties by using a conventional fast‐fast coincidence spectrometer. It was found that the o‐Ps lifetime (τ3) and free volume (Vh) increase with increasing CNT percentage in the Na‐CMC/PAM blend. The distribution of the o‐Ps lifetime was broadened with increasing CNT ratios. Furthermore, the glass transition temperature (Tg) increases with increasing loads of CNT. For the first time, a correlation was done between Urbach energy (EU) and Vh. Finally, the results were represented and discussed in the frame of free volume properties. Optical measurements showed that the transmittance T% of Na‐CMC/PAM was 91.12% and decreased to 68.42% and 36.45% after loading with 1.0 and 2.0 wt % CNT. In addition, the blend shows higher insulating properties compared with the individual polymers. The CNT incorporation reduces the band gap significantly and increases the EU in the films.

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“…have fabricated a CMC/PAM compound with superior adsorption capacity for efficient removal of heavy metal ions from the wastewater. They found that copper-loaded products can be used as catalysts after in situ reduction of adsorbed Cu(II) [12]. The CMC and grapheme were combined to form a porous structure, which enhanced the ability to adsorb heavy metal ions [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Poly(acrylic acid)-Grafted Carboxymethyl Cellulose for Efficient Removal of Copper Ions

Lin¹,

Cao²,

Song³

et al. 2019

Journal of Renewable Materials

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Biocompatible and high content grafted carboxymethyl cellulose-gpoly(acrylic acid) powder was successfully synthesized in an aqueous system, and used as adsorbents for the removal of Cu(II) in aqueous solution. The copolymer was characterized by FT-IR and SEM techniques. Graft copolymerization introduced a large number of carboxyl groups in the polymer and caused the micro-surface of the material to be porous. The fundamental adsorption behaviors of the material were studied. The adsorption kinetics was well fitted with pseudo-second order equation, while the adsorption isotherm preferred to be described the Langmuir equation. The maximum adsorption capacity obtained from the Langmuir model was 154.32 mg/g, indicating that the adsorption capacity of carboxymethyl cellulose was improved remarkably after grafting poly(acrylic acid). Moreover, Fourier transform infrared spectroscopy (FT-IR) has been used to investigate the adsorption mechanisms at molecular levels, which revealed that carboxyl groups are facile to form bidentate carboxylates with metal ions. Thus, this environment friendly copolymer will be a promising candidate for application in removal of heavy metal ions.

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Carboxymethyl cellulose/polyacrylamide composite hydrogel for cascaded treatment/reuse of heavy metal ions in wastewater

Cited by 363 publications

References 51 publications

Fabrication and Optimization of the Thermo-Sensitive Hydrogel Carboxymethyl Cellulose/Poly(N-isopropylacrylamide-co-acrylic acid) for U(VI) Removal from Aqueous Solution

Fabrication and Optimization of the Thermo-Sensitive Hydrogel Carboxymethyl Cellulose/Poly(N-isopropylacrylamide-co-acrylic acid) for U(VI) Removal from Aqueous Solution

Characterization, optical, and nanoscale free volume properties of Na‐CMC/PAM/CNT nanocomposites

Synthesis of Poly(acrylic acid)-Grafted Carboxymethyl Cellulose for Efficient Removal of Copper Ions

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