Spherical silica particles decorated with graphene oxide nanosheets as a new sorbent in inorganic trace analysis

Sitko, Rafał; Zawisza, Beata; Talik, E.; Janik, Paulina; Osoba, Grzegorz; Feist, Barbara; Malicka, E.

doi:10.1016/j.aca.2014.05.014

Cited by 75 publications

(39 citation statements)

References 32 publications

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“…Sitko et al. isolated DC‐GO (Chandra) by drying it at 100 °C for an undefined duration of time ,. On the basis of XPS measurements they found a significantly less oxidized material than reported by us here.…”

Section: Resultssupporting

confidence: 42%

“…However, these findings seem to be inconsistent with some of the original observations by Chandra et al . DC‐GO has been shown to display outstanding sorption capacities for lead ions and has been used for a variety of other applications ,,…”

Section: Introductioncontrasting

confidence: 59%

“…However, limited structural characterizations, in particular a lack of XPS, 13 C‐ssNMR and AFM measurements, has meant that the chemical nature of the new GO material remained elusive. In the few follow‐up publications by other groups,, XPS has been utilized as a characterization method by some ,,. The results indicated that GO prepared by dichromate oxidation, now referred to as DC‐GO, is a significantly less oxidized carbon material compared to GO prepared using permanganate (PM‐GO).…”

Section: Introductionmentioning

confidence: 99%

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Detailed Investigation into the Preparation of Graphene Oxide by Dichromate Oxidation

Rosillo‐Lopez

Salzmann

2018

ChemistrySelect

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Graphene oxide (GO) can be prepared using numerous protocols including the well‐known Hummers method that relies on potassium permanganate as the oxidizing agent. Given the widespread use of GO and its many applications, a better understanding of the mechanisms of chemical oxidation is highly desirable including research into alternative oxidizing agents. Limited work has so far been carried out into using potassium dichromate as an oxidizing agent and the chemical structure of GO prepared by dichromate oxidation remains unclear. Here we present a full structural characterization of GO prepared by dichromate oxidation and we investigate its thermal stability. Furthermore, the previously reported preparation protocol is optimized by reducing the reaction time from 5 days to 20 hours and showing that sodium nitrate is not needed in the reaction mixture. Contrary to previous reports, we show that the GO material produced by dichromate oxidation is highly oxidized if thermal annealing is avoided. Compared to traditional GO, larger amounts of carboxylic acid groups are found which constitutes a major advantage for chemical processing and applications in materials chemistry.

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Section: Resultssupporting

confidence: 42%

Section: Introductioncontrasting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

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Detailed Investigation into the Preparation of Graphene Oxide by Dichromate Oxidation

Rosillo‐Lopez

Salzmann

2018

ChemistrySelect

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“…FSCHP has a good adsorption capacity for Cd 2+ , Pb 2+ and Hg 2+ ions in the range of pH 5-8. As the solubility products pK SP of Pb(OH) 2 are 14.84, considering the prevention of the precipitation of metal hydroxides, we measure the FSCHP's adsorption capacity for Pb 2+ ions at pH < 5.5 [44,45]. When the solution's pH is below 4.5, the adsorption capacity of FSCHP for Cd 2+ , Pb 2+ and Hg 2+ ions reduces rapidly with the decrease of pH.…”

Section: Effect Of Solution Phmentioning

confidence: 99%

A small molecular fluorescent sensor functionalized silica microsphere for detection and removal of mercury, cadmium, and lead ions in aqueous solutions

Ding

Zhu

et al. 2015

Sensors and Actuators B: Chemical

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a b s t r a c tIn this paper, we report a sensitive fluorescent sensor (FSCHP) for detection and removal of toxic metal ions (Cd 2+ , Hg 2+ and Pb 2+ ) in aqueous samples. FSCHP is a 2,2-dipicolylamine (DPA) modified naphthalimide fluorophore followed by immobilization to the surface of silica microsphere and support high affinity for Cd 2+ , Hg 2+ and Pb 2+ . Metal adsorption by FSCHP was featured by an enhancement in its fluorescence intensity. The limit of detection of 36 nM for Cd 2+ , 48 nM for Hg 2+ , and 39 nM for Pb 2+ , was measured respectively. Moreover, FSCHP can also be used as adsorbent for the separation of toxic metal ions in the contaminated aqueous solution with high adsorptivity, and can be regenerated by acid treatment. The metal ion removal capacity of FSCHP was retained after five removal/regeneration cycles.

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“…Owing to its stacking property of an electron‐rich, hydrophobic material with a large surface area (theoretical value 2360 m 2 /g [Ref. ]) and π–π electrostatic interactions, G is regarded as an excellent adsorbent for solid‐phase extraction (SPE) . First, G has a huge surface area, indicating high sorption capacity.…”

Section: Introductionmentioning

confidence: 99%

Graphene and Graphene Oxide Modified by Deep Eutectic Solvents and Ionic Liquids Supported on Silica as Adsorbents for Solid‐Phase Extraction

Wang

Row

2017

Bulletin Korean Chem Soc

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A novel deep eutectic solvent (DES) and ionic liquid (IL)‐modified graphene (G) and graphene oxide (GO) were synthesized and used as effective adsorbents for the preconcentration of three chlorophenols (CPs), 4‐chlorophenol (4‐CP), 2,4‐dichlorophenol (2,4‐DCP), and 2,4,6‐trichlorophenol (2,4,6‐TCP), in environmental water samples prior to high‐performance liquid chromatography (HPLC). The new materials were characterized by scanning electron microscopy (S‐4200) and Fourier‐transform infrared spectrometry. The prepared functionalized GO@silica shows remarkable adsorption capacity toward CPs. When used as solid‐phase extraction (SPE) sorbents, a superior recovery (88.49–89.70%) could be obtained compared to commercial sorbents, such as silica and aminosilica. Based on this, a method for the analysis of CPs in water samples was established by coupling SPE with HPLC. These results highlight the potential new role of DES and IL‐modified GO in the preparation of analytical samples.

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Spherical silica particles decorated with graphene oxide nanosheets as a new sorbent in inorganic trace analysis

Cited by 75 publications

References 32 publications

Detailed Investigation into the Preparation of Graphene Oxide by Dichromate Oxidation

Detailed Investigation into the Preparation of Graphene Oxide by Dichromate Oxidation

A small molecular fluorescent sensor functionalized silica microsphere for detection and removal of mercury, cadmium, and lead ions in aqueous solutions

Graphene and Graphene Oxide Modified by Deep Eutectic Solvents and Ionic Liquids Supported on Silica as Adsorbents for Solid‐Phase Extraction

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