Thiosemicarbazide-grafted graphene oxide as superior adsorbent for highly efficient and selective removal of mercury ions from water

Sitko, Rafał; Musielak, Marcin; Serda, Maciej; Talik, E.; Zawisza, Beata; Gągor, Anna; Małecka, Małgorzata A.

doi:10.1016/j.seppur.2020.117606

Cited by 40 publications

(17 citation statements)

References 65 publications

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“…The adsorbent material shows fast adsorption with a saturation capacity of 121.95 mg g −1 and 109.49 mg g −1 at 298 K, suggesting a good affinity for MB molecules and Hg(II) ions. These results are superior to those recently reported for other graphene-based benchmark materials [ 35 , 36 , 37 , 38 , 39 , 40 ]. By means of several chemical physics analyses, we have also shown that rGO keeps a good efficiency over a wide range of initial cationic pollutant concentrations and a broad range of pH values.…”

Section: Discussioncontrasting

confidence: 87%

“…It can be seen that rGO rapidly captures MB molecules after 30 min ( Figure 5 a), while for Hg (II), the equilibrium time of adsorption is 20 min ( Figure 5 b). These results highlight the effectiveness of rGO for removing cationic pollutants from aqueous solutions compared with conventional benchmark sorbents [ 35 , 36 , 37 , 38 , 39 , 40 ]. In particular, the effectiveness of rGO can be attributed to the recovered surface area after the reduction process as well as the presence of oxygen functional groups.…”

Section: Resultsmentioning

confidence: 84%

“…There is extensive literature on the use of extra functionalized rGO or GO (e.g., GONR [ 35 ], S-GO [ 36 ], GO-TSC [ 37 ], S-doped g-C 3 N 4 /LGO [ 38 ], GSH-NiFe 2 O 4 /GO [ 39 ], HT-rGO-N [ 40 ]) for treating water and wastewater; however, the use of pristine rGO is scarce (and sometimes unclear) when removing cationic heavy metals and cationic dyes from aqueous media. In this work, such a comparative study is presented, considering methyl blue (MB) as a cationic dye and mercury (II) (Hg(II)) as cationic heavy metal.…”

Section: Introductionmentioning

confidence: 99%

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Cationic Pollutant Removal from Aqueous Solution Using Reduced Graphene Oxide

et al. 2022

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Reduced graphene oxide (rGO) is one of the most well-known graphene derivatives, which, due to its outstanding physical and chemical properties as well as its oxygen content, has been used for wastewater treatment technologies. Particularly, extra functionalized rGO is widely preferred for treating wastewater containing dyes or heavy metals. Nevertheless, the use of non-extra functionalized (pristine) rGO for the removal of cationic pollutants is not explored in detail or is ambiguous. Herein, pristine rGO—prepared by an eco-friendly protocol—is used for the removal of cationic pollutants from water, i.e., methylene blue (MB) and mercury-(II) (Hg-(II)). This work includes the eco-friendly synthesis process and related spectroscopical and morphological characterization. Most importantly, the investigated rGO shows an adsorption capacity of 121.95 mg g−1 for MB and 109.49 mg g−1 for Hg (II) at 298 K. A record adsorption time of 30 min was found for MB and 20 min for Hg (II) with an efficiency of about 89% and 73%, respectively. The capture of tested cationic pollutants on rGO exhibits a mixed physisorption–chemisorption process. The present work, therefore, presents new findings for cationic pollutant adsorbent materials based on oxidized graphenes, providing a new perspective for removing MB molecules and Hg(II) ions.

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Section: Discussioncontrasting

confidence: 87%

Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

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Cationic Pollutant Removal from Aqueous Solution Using Reduced Graphene Oxide

et al. 2022

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“…Furthermore, graphene and GO can be modified or functionalised with amino, thiol, dithiocarbamate, amidinothiourea and thiosemicarbazide groups [18], 5-amino-1,10-phenanthroline [19], and deep eutectic solvents [20], among others. Several authors employed modifications of these synthetic approaches adapting them to the support or technique further applied.…”

Section: Graphene and Graphene Derivativesmentioning

confidence: 99%

Graphene-based nanocomposites in analytical extraction processes

Pena‐Pereira

Romero

Calle

et al. 2021

TrAC Trends in Analytical Chemistry

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“…The changes of NÀ H binding energies after adsorption confirmed the contribution of N atoms to the complexation with metal ions. [23] The O1s spectrum of TpTc could be deconvoluted into two peaks at binding energies 531.0 eV(C=O) and 533.1 eV(C-OH) (Figure 7c). The O1s spectra after adsorption revealed the positive shifts of the C=O peaks, which indicates that the electronic cloud of O atoms moves toward the metal ions.…”

Section: Probable Mechanism Of Metal Ions Adsorptionmentioning

confidence: 99%

Thiosemicarbazide‐Linked Covalent Organic Framework: Preparation, Properties and Applications

Wang

Quan

et al. 2021

ChemistrySelect

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With the unique advantages in structure and property, covalent organic frameworks have been widely employed for separation and enrichment. In this work, the thiosemicarbazide‐linked covalent organic framework (TpTc) was prepared by using 1,3,5‐triformylphloroglucinol and non‐rigid thiosemicarbazide as building blocks for the first time. The as‐prepared TpTc COF was fully characterized, presenting an agaric‐like structure, large specific surface area (63.5 m2 g−1), uniform pore size distribution (1.36 nm), inherent porosity and ordered crystallinity. The potential of TpTc as adsorbent for metal ions capture was investigated by static batch adsorption experiment using the one‐factor procedure. The maximum adsorption capacities of 73.50, 56.53 and 94.13 mg g−1 were obtained for Cu (II), Pb (II) and Cd (II) at natural pH, respectively. The anchoring of three metal ions onto TpTc is a multi‐layer sorption involving chemical adsorption, and obeys the Freundlich and pseudo‐second‐order model. According to XPS analysis, the adsorption mechanism may be attributed to the coordination and electrostatic interaction between metal ions and N, O and S atoms on TpTc COF. This work not only provides a candidate for the application of COFs in metal ions capture, but also a reference for exploring functional design of COFs.

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Thiosemicarbazide-grafted graphene oxide as superior adsorbent for highly efficient and selective removal of mercury ions from water

Cited by 40 publications

References 65 publications

Cationic Pollutant Removal from Aqueous Solution Using Reduced Graphene Oxide

Cationic Pollutant Removal from Aqueous Solution Using Reduced Graphene Oxide

Graphene-based nanocomposites in analytical extraction processes

Thiosemicarbazide‐Linked Covalent Organic Framework: Preparation, Properties and Applications

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