Ultrasonic-assisted synthesis of polyacrylamide/bentonite hydrogel nanocomposite for the sequestration of lead and cadmium from aqueous phase: Equilibrium, kinetics and thermodynamic studies

Khan, Suhail Ayoub; Siddiqui, Mohammad Fuzail; Khan, Tabrez Alam

doi:10.1016/j.ultsonch.2019.104761

Cited by 65 publications

(22 citation statements)

References 54 publications

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“…is illustrated an interaction between heavy metal ions and the C-N functional group in the nanocomposite [165]. Other reports in FTIR analysis are summarized in Table 8.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 88%

“…e structure of the material was therefore an intercalated nanocomposite. XRD diffractograms for bentonite clay analyzed by [165] have shown a basal peak corresponding to montmorillonite in a study to synthesize a clay-hydrogel nanocomposite for Pb 2+ ad Cd 2+ removal. is basal peak was reported to disappear in the diffractogram of the nanocomposite due to exfoliation of the clay structure.…”

Section: Scanning Electron Microscopy and Transmitted Electronmentioning

confidence: 99%

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Review of Clay-Based Nanocomposites as Adsorbents for the Removal of Heavy Metals

Kinoti

Karanja

Nthiga

et al. 2022

Journal of Chemistry

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Due to rapid industrialization, urbanization, and surge in modern human activities, water contamination is a major threat to humanity globally. Contaminants ranging from organic compounds, dyes, to inorganic heavy metals have been of major concern in recent years. This necessitates the development of affordable water remediation technologies to improve water quality. There is a growing interest in nanotechnology recently because of its application in eco-friendly, cost-effective, and durable material production. This study presents a review of recent nanocomposite technologies based on clay, applied in the removal of heavy metals from wastewater, and highlights the shortcomings of existing methods. Recently published reports, articles, and papers on clay-based nanocomposites for the removal of heavy metals have been reviewed. Currently, the most common methods utilized in the removal of heavy metals are reverse osmosis, electrodialysis, ion exchange, and activated carbon. These methods, however, suffer major shortcomings such as inefficiency when trace amounts of contaminant are involved, uneconomical costs of operation and maintenance, and production of contaminated sludge. The abundance of clay on the Earth’s surface and the ease of modification to improve adsorption capabilities have made it a viable candidate for the synthesis of nanocomposites. Organoclay nanocomposites such as polyacrylamide-bentonite, polyaniline-montmorillonite, and β-cyclodextrin-bentonite have been synthesized for the selective removal of various heavy metals such as Cu2+, Co2+, among others. Bacterial clay nanocomposites such as E. coli kaolinite nanocomposites have also been successfully synthesized and applied in the removal of heavy metals. Low-cost nanocomposites of clay using biopolymers like chitosan and cellulose are especially in demand due to the cumulative abundance of these materials in the environment. A comparative analysis of different synthetic processes to efficiently remove heavy metal contaminants with clay-based nanocomposite adsorbents is made.

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“…is illustrated an interaction between heavy metal ions and the C-N functional group in the nanocomposite [165]. Other reports in FTIR analysis are summarized in Table 8.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 88%

Section: Scanning Electron Microscopy and Transmitted Electronmentioning

confidence: 99%

Review of Clay-Based Nanocomposites as Adsorbents for the Removal of Heavy Metals

Kinoti

Karanja

Nthiga

et al. 2022

Journal of Chemistry

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“…35 From the spectrum of HAM, the peak of 1589 cm −1 and 1398 cm −1 are derived from the antisymmetric stretching vibration of COO − in AA and the stretching vibration of C N in AM, respectively. 36,37 However, the peak of COO − and C N are shifted to 1575 and 1409 cm −1 in the spectrum of THAM-2 gels. This phenomenon is similar to the finding of Madhan et al 38 The reason for the deviation may be that the carboxyl group and amino group formed hydrogen bond with the phenolic hydroxyl group in the TA.…”

Section: Fourier Transform-infrared Spectroscopymentioning

confidence: 97%

Hydroxyethyl cellulose hydrogel modified with tannic acid as methylene blue adsorbent

Feng

Zhang

Kang

et al. 2020

J of Applied Polymer Sci

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This work developed an effective way to improve the methylene blue (MB) adsorption performance of cellulose-based hydrogel by modified with tannic acid (TA). HEC-co-p(AA-AM)/TA hydrogel was synthesized by grafting of acrylic acid (AA) and acrylamide (AM) onto hydroxyethyl cellulose (HEC), followed by modified with TA. Fourier transform infrared spectroscopy manifested that AA and AM were successfully grafted onto the hydrogel, and TA was immobilized in the hydrogel. Field emission scanning electron microscope demonstrated that the hydrogel after TA modification had a homogeneous pore structure. Brunauer-Emmett-Teller (BET) surface areas, total pore volume, and average pore diameters of the hydrogel are 11.821 m 2 g −1 , 0.0641 cm 3 g −1 , and 2.538 nm, respectively. The high swelling ratio (1179.2 g g −1 in deionized water) was in favor of the MB adsorption. The results of the adsorption experiments illustrated that HEC-cop (AA/AM) hydrogel had excellent MB adsorption performance. As the pH increases, the electrostatic attraction is enhanced, and the adsorption capacity is improved. The adsorption process was more fit with pseudo-second-order kinetics, and the maximum adsorption capacity (3438.27 mg g −1) was determined by Langmuir model. Thermodynamic studies suggested that the adsorption process is spontaneous, exothermic, and entropy reduction. X-ray photoelectron spectroscopy analysis confirmed that MB molecules were reacted with the oxygen atoms in hydroxyl and carboxyl groups by ion-exchange. High reusability demonstrated that the hydrogel could be a potential candidate for removal cationic dye from industrial effluents.

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“…Clay-based hydrogel nanocomposites are envisioned to be potential super adsorbents for the uptake of inorganic and/or organic contaminants from an aqueous solution due to the combining characteristics of both clays and polymers, such as biodegradability, biocompatibility, economic viability, abundance, high specific surface area, three-dimensional network, and swelling–deswelling properties . Recently, many clay-based hydrogel composites have been explored for the confiscation of dyes , and metals − mainly because of their chemically reactive functional groups and porous structures. A perusal of the literature reveals that there is little work on the removal of pharmaceutical pollutants by clay–hydrogel nanocomposites; therefore, the main motive was to explore the efficacy of poly(methacrylic acid)/montmorillonite hydrogel (PMA/nMMT) nanocomposite toward the uptake of amoxicillin and diclofenac from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Poly(methacrylic acid)/Montmorillonite Hydrogel Nanocomposite for Efficient Adsorption of Amoxicillin and Diclofenac from Aqueous Environment: Kinetic, Isotherm, Reusability, and Thermodynamic Investigations

2020

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Herein, a simplistic redox polymerization strategy was utilized for the fabrication of a poly(methacrylic acid)/montmorillonite hydrogel nanocomposite (PMA/nMMT) and probed as a sorbent for sequestration of two pharmaceutical contaminants, viz., amoxicillin (AMX) and diclofenac (DF), from wastewater. The synthesized hydrogel nanocomposite was characterized by the Fourier transform infrared, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy–energy dispersive X-ray spectroscopy, and transmission electron microscopy techniques to analyze structural characteristics and sorption interactions. The efficacy of PMA/nMMT was thoroughly investigated for the sequestration of AMX and DF from the aquatic phase with a variation in operative variables like agitation time, sorbent dosage, pH, and initial sorbate concentration. The reaction kinetics was essentially consistent with the pseudo-second-order model with rate dominated by the intraparticle diffusion model as well as the film diffusion mechanism. The Freundlich isotherm appropriated the equilibrium data over the entire range of concentration. Thermodynamic investigation explored the spontaneous and endothermic nature of the process. The most possible mechanism has been explained, which includes electrostatic interaction, hydrogen bonding, cationic exchange, and partition mechanism. Economic feasibility, better sorption capacity (152.65 for AMX and 152.86 mg/g for DF), and efficient regeneration and reusability even after four consecutive sorption–desorption cycles ascertained PMA/nMMT as a potential sorbent for AMX and DF uptake from the aqueous phase.

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Ultrasonic-assisted synthesis of polyacrylamide/bentonite hydrogel nanocomposite for the sequestration of lead and cadmium from aqueous phase: Equilibrium, kinetics and thermodynamic studies

Cited by 65 publications

References 54 publications

Review of Clay-Based Nanocomposites as Adsorbents for the Removal of Heavy Metals

Review of Clay-Based Nanocomposites as Adsorbents for the Removal of Heavy Metals

Hydroxyethyl cellulose hydrogel modified with tannic acid as methylene blue adsorbent

Synthesis of Poly(methacrylic acid)/Montmorillonite Hydrogel Nanocomposite for Efficient Adsorption of Amoxicillin and Diclofenac from Aqueous Environment: Kinetic, Isotherm, Reusability, and Thermodynamic Investigations

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