Adsorption of methylene blue by <i>Nicandra physaloides(L.) Gaertn</i> seed gum/graphene oxide aerogel

Li, Liubo; Li, Yanhui; Yang, Kai; Li, Meixiu; Luan, Xinyu; Sun, Yong; Wang, Huimin; Sun, Qinye; Tang, Kaili; Zheng, Hairong; Cui, Mingfei; Xu, Wenshuo

doi:10.1080/09593330.2021.1877361

Cited by 4 publications

(3 citation statements)

References 50 publications

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“…To better analyze the adsorption process, the experimental data were fitted with a Pseudo-first-order model, a Pseudo-second-order model, an Elovich kinetic model (Figure a), and an intraparticle diffusion model. − Where q t and q e in the formula represent the adsorption capacity at time t and the adsorption capacity after reaching the adsorption equilibrium, respectively. The pseudo-first-order model (eq ), the pseudo-second-order model (eq ), and Elovich kinetic model (eq ) are formulated as follows q normalt = q normale ( 1 − e − k t ) q normalt = q normale v 0 t q normale + v 0 t q normalt = ln ( α β ) β + ln ( t ) β where k (min –1 ) refers to the rate constant of the pseudo-first-order model, v 0 (mg·g –1 ·min –1 ) refers to the adsorption rate when adding adsorbents.…”

Section: Resultsmentioning

confidence: 99%

Methylene Blue Removed from Aqueous Solution by Encapsulation of Bentonite Aerogel Beads with Cobalt Alginate

Sun

Chen

et al. 2022

ACS Omega

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It can be difficult to remove dark methylene blue (MB) from water effectively. The use of sodium alginate and bentonite (Ben) as the matrix produced a displacement reaction that occurred in cobalt chloride, which allowed Ben to be successfully encapsulated in cobalt alginate (CA). Finally, a vacuum freeze-drying method was used to prepare a low-cost composite of CA/Ben aerogel for adsorbing MB in aqueous solutions. In addition to scanning electron microscopy, thermogravimetric analysis, and Fourier transform infrared spectroscopy, the composites were also characterized and analyzed. Different adsorption experiments were conducted in order to determine the effects of dosage, pH, adsorption time, and temperature on the adsorption performance of the adsorbent. According to the results of the experiment, the adsorption capacity of CA/Ben aerogel was 258.92 mg•g −1 , and the pseudo-first-order kinetic model and Freundlich isotherm model can fully explain the adsorption process of MB on this aerogel. The composite material reported in this paper is easily recycled, and the removal rate reaches 65% after four times of recycling. Moreover, compared with other adsorbents, the composite material of the invention is highly environmentally friendly and has a simple preparation process. A large-scale application of this technology is the removal of dyes from water on a large scale.

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Section: Resultsmentioning

confidence: 99%

Methylene Blue Removed from Aqueous Solution by Encapsulation of Bentonite Aerogel Beads with Cobalt Alginate

Sun

Chen

et al. 2022

ACS Omega

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“…Pseudo-first-order model describes the process in which pollutants are adsorbed to the surface by overcoming surface resistance through physical diffusion and physical interaction [ 44 ]. Pseudo-second-order model considers that chemical interaction is the main factor controlling the adsorption rate, and the adsorption process dominated by chemical adsorption generally has the highest fitting degree [ 45 ].…”

Section: Resultsmentioning

confidence: 99%

Effective Removal of Tetracycline from Water Using Copper Alginate @ Graphene Oxide with In-Situ Grown MOF-525 Composite: Synthesis, Characterization and Adsorption Mechanisms

Chen

et al. 2022

Nanomaterials

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For nanomaterials, such as GO and MOF-525, aggregation is the main reason limiting their adsorption performance. In this research, Alg-Cu@GO@MOF-525 was successfully synthesized by in-situ growth of MOF-525 on Alg-Cu@GO. By dispersing graphene oxide (GO) with copper alginate (Alg-Cu) with three-dimensional structure, MOF-525 was in-situ grown to reduce aggregation. The measured specific surface area of Alg-Cu@GO@MOF-525 was as high as 807.30 m2·g−1, which is very favorable for adsorption. The synthesized material has affinity for a variety of pollutants, and its adsorption performance is significantly enhanced. In particular, tetracycline (TC) was selected as the target pollutant to study the adsorption behavior. The strong acid environment inhibited the adsorption, and the removal percentage reached 96.6% when pH was neutral. Temperature promoted the adsorption process, and 318 K adsorption performance was the best under experimental conditions. Meanwhile, 54.6% of TC could be removed in 38 min, and the maximum adsorption capacity reached 533 mg·g−1, far higher than that of conventional adsorption materials. Kinetics and isotherms analysis show that the adsorption process accords with Sips model and pseudo-second-order model. Thermodynamic study further shows that the chemisorption is spontaneous and exothermic. In addition, pore-filling, complexation, π-π stack, hydrogen bond and chemisorption are considered to be the causes of adsorption.

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“…content increases the removal capacity towards anionic dye. In parallel the use of Nicandra physaloides(L.) Gaertn seed gum with GO aerogels enhanced the removal of methylene blue [95]. The samples can be regenerated and recycled without loss of contaminant removal capacity over four successive adsorption and washing cycles.…”

Section: Removal Of Organic Compoundsmentioning

confidence: 99%

A perspective on graphene based aerogels and their environmental applications

2022

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Adsorption of methylene blue by Nicandra physaloides(L.) Gaertn seed gum/graphene oxide aerogel

Cited by 4 publications

References 50 publications

Methylene Blue Removed from Aqueous Solution by Encapsulation of Bentonite Aerogel Beads with Cobalt Alginate

Methylene Blue Removed from Aqueous Solution by Encapsulation of Bentonite Aerogel Beads with Cobalt Alginate

Effective Removal of Tetracycline from Water Using Copper Alginate @ Graphene Oxide with In-Situ Grown MOF-525 Composite: Synthesis, Characterization and Adsorption Mechanisms

A perspective on graphene based aerogels and their environmental applications

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