Adsorption behavior of bisphenol A on CTAB-modified graphite

Wang, Li-Cong; Ni, Xiaomin; Cao, Yuhua; Cao, Gaoshao

doi:10.1016/j.apsusc.2017.07.093

Cited by 90 publications

(29 citation statements)

References 32 publications

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“…The values of q e for PE, ME, IPE, BPA and PPE on a given adsorbent were remarkably distinguished from each other, which increased from 0.271, 0.356, 0.454, 0.4 and 0.70 mmol g −1 on GO to 0.483, 0.841, 1.117, 1.56 and 2.054 mmol g −1 on RGO, respectively. Table 1 presents the existent adsorption capacity of PE and BPA in the presence of different adsorbents [31][32][33][34][35][36]. From Table 1, it was observed that RGO for the adsorption of PE and BPA had a relatively large adsorption capacity among the adsorbents.…”

Section: Effect Of Contact Timementioning

confidence: 99%

Adsorption Characteristics of Phenolic Compounds on Graphene Oxide and Reduced Graphene Oxide: A Batch Experiment Combined Theory Calculation

Wang

Min

et al. 2018

Applied Sciences

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A series of phenolic compounds containing 2-phenylphenol (PPE), bisphenol A (BPA), 4-isopropylphenol (IPE), 4-methylphenol (ME) and phenol (PE) were selected to investigate their major influence factors for their adsorption on graphene oxide (GO) and reduced graphene oxide (RGO) by studying their adsorption isotherms and kinetics. It was found that the adsorption of all tested phenols fitted well with the Freundlich model. In comparison, the adsorption ability of RGO with a stronger π-π interaction was superior to GO, which was confirmed by using naphthalene probe measurements. The thermodynamic characteristics, by studying the effect of the adsorption temperatures (298, 313 and 333 K), demonstrated that the adsorption process was spontaneous, exothermic and entropy-decreasing. The chemical structures of the phenols also affected their adsorption on GO and RGO. It was found that the adsorption capacities of phenols were, in order, PE (0.271 mmol g−1 on GO and 0.483 mmol g−1 on RGO) < ME (0.356 and 0.841 mmol g−1) < IPE (0.454 and 1.117 mmol g−1) < BPA (0.4 and 1.56 mmol g−1) < PPE (0.7 and 2.054 mmol g−1), which depended on the π-electron density of the benzene ring by means of a density functional theory (DFT) calculation. Undoubtedly, the reduction of GO and an increase in π-electron density on the chemical structures of phenols facilitated the adsorption.

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Section: Effect Of Contact Timementioning

confidence: 99%

Adsorption Characteristics of Phenolic Compounds on Graphene Oxide and Reduced Graphene Oxide: A Batch Experiment Combined Theory Calculation

Wang

Min

et al. 2018

Applied Sciences

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“…Among its properties are low vapor pressure, low volatility and moderate water solubility. Bisphenol–A can easily leach out of products and migrate into the aquatic environment [7], creating a public health, as well as environmental, threat worldwide [8].…”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide Based Magnetic Nanocomposites with Polymers as Effective Bisphenol–A Nanoadsorbents

et al. 2019

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Magnetic graphene oxide was impregnated with polymers for the preparation of nanocomposite adsorbents to be examined for the adsorptive removal of a typical endocrine disruptor, bisphenol–A (BPA) from aqueous solutions. The polymers used were polystyrene, chitosan and polyaniline. The nanocomposites prepared were characterized for their structure, morphology and surface chemistry. The nanocomposites presented an increase adsorptive activity for BPA at ambient conditions, compared to pure magnetic oxide, attributed to the synergistic effect of the polymers and the magnetic graphene oxide. The increased adsorption of BPA exhibited by the nanocomposites with chitosan and polyaniline could be attributed to the contribution of amine groups.

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“…In recent years, raw clays such as montmorillonite, vermiculite, kaolinite and bentonite, and especially their modified organoclays with cationic surfactants, have been widely used as efficient adsorbents of heavy metal ions or organic pollutants . Some studies have shown that the adsorption capacity of organo‐montmorillonite modified with quaternary ammonium cationic surfactants on pollutants is greatly improved compared with the original clay . Luo et al .…”

Section: Introductionmentioning

confidence: 99%

Microstructural modification of organo‐montmorillonite with Gemini surfactant containing four ammonium cations: molecular dynamics (MD) simulations and adsorption capacity for copper ions

Chu

Khan

Xia

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Copper is a heavy metal that is widely available in nature and has attracted people's attention because of its toxicity and difficult biodegradability. Using modified montmorillonite to adsorb copper ions (Cu 2+ ) was widely adopted because of its simple operation, high efficiency, and easy availability. RESULTS: Na-montmorillonite (Na-Mt) was modified through a Gemini surfactant (containing four ammonium cations) to explore the adsorption capacity for Cu 2+ in aqueous media. The resulting product is called G-Mt. FT-IR XRDBET results indicated that Gemini surfactant has significantly intercalated into the montmorillonite interlayers. The results ofbatch adsorption experiments presented that the amount of adsorbed (qe) depend on pH value and qe (G-Mt) can reach to 29.30 mg/g, which was greater than that of Na-Mt (25.30 mg/g) when pH is 6.0 and initial Cu 2+ concentration is 75 mg/L. The experimental data matched well with Langmuir isotherm. The thermodynamic analysis implied that adsorption of Cu 2+ was endothermic and a spontaneous process. Molecular dynamics (MD) models were carried out to investigate the microstructure and kinetic information of Gemini cations in the interlayer of G-Mt. The results elucidated that the distribution and interaction characteristic of ammonium cations of Gemini surfactant including four ammonium cations were completely different from that of the quaternary ammonium salts containing asingle ammonium cation. CONCLUSION: Generally, considering the comprehensive performances, polyamine Gemini surfactant to modify montmorillonite can improve its ability to adsorb Cu 2+ . The micro environment in the interlayer space and adsorption properties of G-Mt on Cu 2+ , which will improve the potential utilization of G-Mt in soil remediation or wastewater treatment. Y Chu et al.with the original clay. 10,11 Luo et al. 12 used butane-1,4-bis(dodecyl dimethyl ammonium bromide) (gBDDA)-and dodecyl trimethyl ammonium bromide (DTMA)-modified montmorillonite (Mt) to adsorb chromate and phenol. The study revealed that using a Gemini surfactant such as gBDDA to modify Mt would significantly reduce or even have the potential to eradicate the secondary pollution by modifier release during the adsorption process. Li et al. 13 used propyl bis(hexadecyl dimethyl ammonium) chloride (16-3-16)-modified calcium montmorillonite (Ca-Mt) to obtain organo-montmorillonite (G-Mt). The material was used to adsorb a class of emerging contaminants (ECs) such as 1-hydroxybenzotriazole (HOBT), 1H-benzotriazole (BTA) and 5-methyl-1H-benzotriazole (TTA) from wastewater. The maximum adsorption capacities at equilibrium were 25.93, 18.31 and 16.24 mg g −1 for HOBT, BTA and TTA respectively, greater than that of Ca-Mt.Recently, dimeric Gemini surfactant-modified organo-Mts have been of interest to researchers for their applications for adsorbing organic pollutants. 14,15 These dimeric Gemini surfactants generally contain two hydrophilic head groups and two hydrophobic chains linked by a spacer and are expected to ex...

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Adsorption behavior of bisphenol A on CTAB-modified graphite

Cited by 90 publications

References 32 publications

Adsorption Characteristics of Phenolic Compounds on Graphene Oxide and Reduced Graphene Oxide: A Batch Experiment Combined Theory Calculation

Adsorption Characteristics of Phenolic Compounds on Graphene Oxide and Reduced Graphene Oxide: A Batch Experiment Combined Theory Calculation

Graphene Oxide Based Magnetic Nanocomposites with Polymers as Effective Bisphenol–A Nanoadsorbents

Microstructural modification of organo‐montmorillonite with Gemini surfactant containing four ammonium cations: molecular dynamics (MD) simulations and adsorption capacity for copper ions

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