Montmorillonite-reduced graphene oxide composite aerogel (M−rGO): A green adsorbent for the dynamic removal of cadmium and methylene blue from wastewater

Zhou, Shi; Yin, Jing; Ma, Qiang; Baihetiyaer, Baikerouzi; Sun, Jiaxue; Zhang, Ya; Jiang, Yanji; Wang, Jun; Yin, Xianqiang

doi:10.1016/j.seppur.2022.121416

Cited by 47 publications

(6 citation statements)

References 69 publications

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“…The R 2 value of the D–R model (Figure d) is far behind 1 (0.7860); nevertheless, the important adsorption energy ( E ) parameter value is very high (4004.564 kJ/mol), which is possibly due to chemisorption. , Therefore, considering the above findings, it can be anticipated that chemisorption and physisorption originated and played the key role, indicating cooperative multilayer adsorption. In the literature, there are abundant reports explaining the adsorption nature of physisorption or chemisorption based on the different isotherm models; however, cooperative multilayer adsorption was rarely reported. , The present findings should be cautiously handled to commercialize our adsorbent as the isotherm model has few limitations even though it is used by many researchers. ,,,,, On one hand, after observing much literature, only a few reports have been found based on the green-synthesized AgNPs-mediated adsorptive removal of MB dye, presumably suggesting poor understanding on this subject. Table represents a comparison of q max , kinetics, and catalyst dose of different green-synthesized AgNPs and AgNPs-loaded nanocomposites that has been previously reported.…”

Section: Resultsmentioning

confidence: 77%

“…In the literature, there are abundant reports explaining the adsorption nature of physisorption or chemisorption based on the different isotherm models; however, cooperative multilayer adsorption was rarely reported. 55,58 The present findings should be cautiously handled to commercialize our adsorbent as the isotherm model has few limitations even though it is used by many researchers. 29,32,39,40,44,50 On one hand, after observing much literature, only a few reports have been found based on the green-synthesized AgNPs-mediated adsorptive removal of MB dye, presumably suggesting poor understanding on this subject.…”

Section: Methodsmentioning

confidence: 99%

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Ophiorrhiza mungos-Mediated Silver Nanoparticles as Effective and Reusable Adsorbents for the Removal of Methylene Blue from Water

Akhi,

Hasan,

Saha

et al. 2024

ACS Omega

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Green synthesis of silver nanoparticles (AgNPs) using a plant extract has attracted significant attention in recent years. It is found as an alternative for other physicochemical approaches because of its simplicity, low cost, and eco-friendly rapid steps. In the present study, Ophiorrhiza mungos (Om)mediated AgNPs have been shown to be effective bioadsorbents for methylene blue (MB) dye removal (88.1 ± 1.74%) just after 1 h at room temperature in the dark from an aqueous medium for the first time. Langmuir and Freundlich isotherms fit the experimental results having the correlation coefficient constants R 2 = 0.9956 and R 2 = 0.9838, respectively. From the Langmuir fittings, the maximum adsorption capacity and adsorption intensity were found to be 80.451 mg/g and 0.041, respectively, indicating the excellent performance and spontaneity of the process. Taking both models under consideration, interestingly, our findings indicated a fairly cooperative multilayer adsorption that might have been governed by chemisorption and physisorption, whereas the adsorption kinetics followed the pseudo-second-order kinetics mechanism. The positive and low values of enthalpy (ΔH 0 = 4.91 kJ/mol) confirmed that adsorption is endothermic and physical in nature; however, the negative free energy and positive entropy value (ΔS 0 = 53.69 J/mol K) suggested that the adsorption is spontaneous. The biosynthesized adsorbent was successfully reused up to the fifth cycle. A proposed reaction mechanism for the adsorption process of MB dye onto Om-AgNPs is suggested. The present study may offer a novel finding such as an effective and sustainable approach for the removal of MB dye from water using biosynthesized Om-AgNPs as reusable adsorbents at a comparatively faster rate at a low dose for industrial applications.

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Section: Resultsmentioning

confidence: 77%

Section: Methodsmentioning

confidence: 99%

Ophiorrhiza mungos-Mediated Silver Nanoparticles as Effective and Reusable Adsorbents for the Removal of Methylene Blue from Water

Akhi,

Hasan,

Saha

et al. 2024

ACS Omega

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“…The electrostatic attraction was due to the negatively charged carboxylate and oxide ions in graphene oxide (GO) and the presence of the negatively charged basal layer of montmorillonite (Mt). The negatively charged basal layer in Mt is generated by the cation exchange in the tetrahedral sheet (Al 3+ for Si 4+ ) and octahedral sheet (Mg 2+ for Al 3+ ). , The π electron cloud of MB and GO in the composite membrane governs the π–π stacking interactions. Among all the composite membranes, 20-PGT showed the highest adsorption capacity.…”

Section: Resultsmentioning

confidence: 99%

“…The negatively charged basal layer in Mt is generated by the cation exchange in the tetrahedral sheet (Al 3+ for Si 4+ ) and octahedral sheet (Mg 2+ for Al 3+ ). 62,63 The π electron cloud of MB and GO in the composite membrane governs the π−π stacking interactions. Among all the composite membranes, 20-PGT showed the highest adsorption capacity.…”

Section: Mnp Separation and Mechanismsmentioning

confidence: 99%

Electrospun Polyurethane Nanofiber Membranes for Microplastic and Nanoplastic Separation

Juraij

Ammed

Chinglenthoiba

et al. 2023

ACS Appl. Nano Mater.

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Multifunctional materials for industrial wastewater treatment are in high demand due to the contamination of microand nanoplastics (MNPs) and dyes. Herein, we demonstrate a polyurethane-based (PU) electrospun composite membrane for MNP separation and selective methylene blue (MB) adsorption. The optimized 20 wt % graphene oxide-montmorillonite (GO-Mt)-loaded nanofibrous composite membrane (20-PGT) exhibited its superhydrophilicity with a water contact angle of 0°and high water flux. It displayed a maximum pressure-driven water flow of 8163 L m −2 h −1 and a gravity-driven water flux of 793 L m −2 h −1 . Three model MNPs, such as acrylonitrile butadiene styrene (ABS), polystyrene (PS), and poly(methyl methacrylate) (PMMA) with various sizes, have been demonstrated. The adsorptive separation and size-exclusive interception mechanisms were observed for nanoplastics (NPs) and microplastics (MPs), respectively. Cake formation, intermediate blocking, and standard blocking mechanisms were followed during the filtration of ABS MPs, PMMA NPs, and PS NPs, respectively. Additionally, the composite membrane exhibited selective MB adsorption from the mixture of dyes, with a maximum adsorption capacity of 417 mg g −1 . Langmuir adsorption isotherm and pseudo-second-order kinetics define the adsorption isotherm and adsorption kinetics, respectively. The fabricated, robust fibrous composite membrane opens a wider door for the removal of MNPs and MB from contaminated water.

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“…S4 in Supporting Information) can express the relationship between the maximum binding energy and the constant distribution of bond energy during adsorption. [40] The Langmuir model is based on the assumption that the energy of the adsorbent sites is uniform. [41] The Freundlich isotherm model suggests that one adsorption site could be occupied by more than two adsorbates.…”

Section: Resultsmentioning

confidence: 99%

Reconstruction of Metal Ions Extracted from Coal Gangue to Synthesize Cost‐effective Adsorbent for Highly Efficient Removal of Pollutants

Zhao

Zhang

Feng

et al. 2023

Chemistry An Asian Journal

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An emerging "one stone, three birds" strategy was proposed to realize the value-added disposal of solid waste coal gangue (CG), the synthesis of superb adsorbent and the efficient decontamination of pollutants (i. e., dyes, heavy metals). In this process, the metal ions extrated from calcined coal gangue (CCG) was reconstituted by a one-step hydrothermal process to yield porous polymetallic silicate adsorbent (named HECCGA8h). The adsorbent has a high adsorption capacity of 270.27 and 185.53 mg/g for methylene blue (MB) and Cd(II), respectively. In the actual waters, the removal rate of MB by this adsorbent reaches 99.8% (in Yangtze River water) and 99.42% (in Seawater), and the removal rate of Cd(II) reaches 99.11% (in Yangtze River water) and 92.52% (in Seawater), respectively. Thermokinetic analysis showed that the adsorption of MB by HECCGA8h is spontaneous and endothermic with increased entropy, and the adsorption of Cd(II) is spontaneous and exothermic. The adsorption of MB is mainly driven by synergism of hydrogen bond, electrostatic attraction and ion exchange, and the adsorption of Cd(II) is mainly driven by the complexation and ion exchange between the surface group of the adsorbent and Cd(II). This research provides a new way for the realization of "treating waste with waste".

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Montmorillonite-reduced graphene oxide composite aerogel (M−rGO): A green adsorbent for the dynamic removal of cadmium and methylene blue from wastewater

Cited by 47 publications

References 69 publications

Ophiorrhiza mungos-Mediated Silver Nanoparticles as Effective and Reusable Adsorbents for the Removal of Methylene Blue from Water

Ophiorrhiza mungos-Mediated Silver Nanoparticles as Effective and Reusable Adsorbents for the Removal of Methylene Blue from Water

Electrospun Polyurethane Nanofiber Membranes for Microplastic and Nanoplastic Separation

Reconstruction of Metal Ions Extracted from Coal Gangue to Synthesize Cost‐effective Adsorbent for Highly Efficient Removal of Pollutants

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