One-step generation of S and N co-doped reduced graphene oxide for high-efficiency adsorption towards methylene blue

Li, Meixiu; Li, Yanhui; Zhang, Xiaoping; Zheng, Hairong; Zhang, Aitang; Chen, Tao; Liu, Wenhao; Yu, Yuanhai; Liu, Jingquan; Du, Qiuju; Wang, Dechang; Xia, Yanzhi

doi:10.1039/d0ra06296k

Cited by 21 publications

(7 citation statements)

References 56 publications

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“…The second part is the intramolecular diffusion stage, where the adsorption rate is relatively slow, mainly the particle diffusion stage. Because both line segments do not pass through the origin, both membrane diffusion and intraparticle diffusion have an effect on the adsorption rate during the adsorption of MB by CA/Ben …”

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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“…The N 1s spectrum at a binding energy of 398–400 eV was deconvoluted into 3 peaks centered at 397.9 eV, 399.8 eV, and 401.4 eV, corresponding to pyridinic N, pyrrolic N, and graphitic N, respectively [ 24 , 37 ]. The S 2p spectrum at a binding energy of ~163 eV was deconvoluted into 3 peaks centered at 163.2 eV, 164.4 eV, and 166.7~168.0 eV, corresponding to C–S, C=S, and -SO x , respectively [ 12 , 38 ]. The O 1s spectrum at a binding energy of ~532 eV was deconvoluted into 3 peaks centered at 531.2 eV, 532.5 eV, and 533.5 eV, corresponding to C=O, C–OH, and C–O–C, respectively [ 13 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

Studies on Kinetics, Isotherms, Thermodynamics and Adsorption Mechanism of Methylene Blue by N and S Co-Doped Porous Carbon Spheres

et al. 2021

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Heteroatom-doped carbon is widely used in the fields of adsorbents, electrode materials and catalysts due to its excellent physicochemical properties. N and S co-doped porous carbon spheres (N,S-PCSs) were synthesized using glucose and L-cysteine as carbon and heteroatom sources using a combined hydrothermal and KOH activation process. The physicochemical structures and single-factor methylene blue (MB) adsorption properties of the N,S-PCSs were then studied. The optimized N,S-PCSs-1 possessed a perfect spherical morphology with a 2–8-μm diameter and a large specific area of 1769.41 m2 g−1, in which the N and S contents were 2.97 at% and 0.88 at%, respectively. In the single-factor adsorption experiment for MB, the MB adsorption rate increased with an increase in carbon dosage and MB initial concentration, and the adsorption reached equilibrium within 2–3 h. The pseudo-second-order kinetic model could excellently fit the experimental data with a high R2 (0.9999). The Langmuir isothermal adsorption equation fitted well with the experimental results with an R2 value of 0.9618, and the MB maximum adsorption quantity was 909.10 mg g−1. The adsorption of MB by N,S-PCSs-1 was a spontaneous, endothermic, and random process based on the thermodynamics analyses. The adsorption mechanism mainly involved Van der Waals force adsorption, π-π stacking, hydrogen bonds and Lewis acid–base interactions.

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“…None of the three lines pass through the origin, and the adsorption rate of MB on CA/GO is affected by the diffusion within the particles and the diffusion of the membrane. The intercept of the diffusion part within the particle is relatively large, indicating that the velocity slowdown mainly results from the diffusion within the particle [35] …”

Section: Resultsmentioning

confidence: 99%

High‐Efficiency Adsorption Performance of Cobalt Alginate/ Graphene Oxide Aerogel Prepared by Green Method for Methylene Blue

Sun

Chen

et al. 2022

ChemistrySelect

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In this paper, cobalt alginate/graphene oxide (CA/GO) aerogel composites were prepared by wet spinning and vacuum freezing. The cobalt ion only ion-pairs with the carboxyl ion in the alginate, and other groups such as hydroxyl were not combined with cobalt ions, generating free hydroxyl, and thus improving the adsorption performance and recyclability of the composite material. The adsorption properties of CA/GO aerogels gradually improved with the increase of pH. The maximum adsorption capacity of CA/GO aerogel at 298 K was 294.18 mg.g À 1 , and the adsorption process of methylene blue (MB) on CA/GO aerogel conformed to Langmuir isotherm model and pseudo-second-order model. The adsorption of MB on CA/GO is mainly attributed to electrostatic attraction, hydrogen bonding and π-π interaction. Thermodynamic analysis showed that the adsorption process was both spontaneous and exothermic. After the CA/GO aerogel was reused for 5 times, the removal rate reached as high as 80.256 %. Compared with other adsorbents, the prepared adsorbent was proven to be provided with good removal capacity for MB, and expected to be widely applied to the adsorption treatment of MB wastewater.

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One-step generation of S and N co-doped reduced graphene oxide for high-efficiency adsorption towards methylene blue

Abstract: A novel method was developed to directly generate S and N co-doped reduced graphene oxide for the adsorption of MB.

Cited by 21 publications

References 56 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

Studies on Kinetics, Isotherms, Thermodynamics and Adsorption Mechanism of Methylene Blue by N and S Co-Doped Porous Carbon Spheres

High‐Efficiency Adsorption Performance of Cobalt Alginate/ Graphene Oxide Aerogel Prepared by Green Method for Methylene Blue

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