Ultra-high adsorption capacity and selective removal of Congo red over aminated graphene oxide modified Mn-doped UiO-66 MOF

Eltaweil, Abdelazeem S.; Elshishini, Hala M.; Ghatass, Z. F.; El‐Subruiti, Gehan M.

doi:10.1016/j.powtec.2020.10.084

Cited by 151 publications

(59 citation statements)

References 60 publications

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“…The microscopic pictures revealed the existence of intact diatomite skeletons whose framework structure is composed of diatomite shells represented by various diatom morphological types. The SEM observation clearly confirmed the presence of a well-defined and mostly preserved porous structure, which is an important parameter and key medium for any adsorption process, the porous shells consisting mainly of SiO 2 groups [27,28]. It can be also inferred that the diatomite samples are rich in two classes of diatoms: centric and pennate, and large void volumes (Fig.…”

Section: Sem Analysissupporting

confidence: 56%

“…Other bands at 800 and 454 cm −1 are also characteristic of silica; the first one may be related to the stretching vibration of Al-O-Si [35], but it can be also attributed to O-H deformation or the free silica and/or symmetric stretching in SiO-H [31,36,37], whereas the second band is assigned to the bending vibrations of Si-O-Si [36]. Considering these functional groups on the surface of the diatomite witch facilitate the electrostatic attraction with the cationic MB, it is proposed that hydrogen bond would be formed between the raw diatomite and MB and contributes significantly to the high adsorption of dye [27].…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

“…It is clear from the comparison that the OD05 (116.59 mg/g) possesses a higher adsorption capacity than other reported adsorbents, after the Jordanian diatomite (198 mg/g). This is probably due to the fact that the diatomite surface can interact with MB in different ways; (1) electrostatic attraction, (2) chemical adsorption via conjugation, hydrogen bonding, and pore filling mechanism [27]. It seems that the amount of MB dye loaded on the diatomite surface depends on the nature of the surface (determined by the mentioned method: FTIR, SEM, BET), which varies from a sample to another (S BET , V t , and the silica percentage).…”

Section: Discoloration Capacitymentioning

confidence: 99%

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Characterization and efficient dye discoloration of Algerian diatomite from Ouled Djilali-Mostaganem

et al. 2021

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A series of naturally occurring diatomaceous earth samples from Ouled Djilali, Mostaganem (Lower Chelif basin, Algeria northwestern), were investigated, which are characterized by the expansion and evolution during the Messinian age. Four varieties of diatomite were distinguished, characterized, and successfully used to adsorb methylene blue dye in aqueous medium. Several properties and characteristics of diatomite have been outlined using analytical methods such as X-ray fluorescence spectrometry, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N2 adsorption–desorption (BET), and scanning electron microscopy (SEM), as well as other complementary analysis tests. Results showed that silica and calcium carbonates were the main constituents of the diatomite samples (ranging between 32.8 and 61.5% for SiO2; and 13.8–25.9% for CaO), with a slight difference in chemical composition between selected samples. Typical for all diatomite samples, the XRD analysis suggests a high mass quantity of amorphous phase (Opal); high content of crystal phase was also registered. FTIR allowed determining the basic characteristic silica bands regarding diatomite samples. While the BET and SEM investigations revealed that the studied diatomite material has a highly porous structure and was very rich in diatoms. The maximum adsorption capacity of methylene blue that was calculated from the Langmuir isotherm model was 116.59 mg/g (for Ouled Djilali: OD05 sample) at 25 °C and pH 7.0. The diatomite from Mostaganemian (Ouled Djilali) deposit may find promising applications as low-cost adsorbent for dyes removal from water.

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Section: Sem Analysissupporting

confidence: 56%

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

Section: Discoloration Capacitymentioning

confidence: 99%

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Characterization and efficient dye discoloration of Algerian diatomite from Ouled Djilali-Mostaganem

et al. 2021

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“…(Zhang et al 2020;Chen et al 2020). Many studies have been done by researchers and found that coating the surface with other materials (such as MOF) is considered to be a good way to avoid its defects, and GO-MOF composite material is hence considered to be a good composite adsorption material (Zhou et al 2014; Amini et al 2020;Eltaweil et al 2020; Bu et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Preparation of GO/MIL-101(Fe,Cu) composite and its adsorption mechanisms for phosphate in aqueous solution

Liu

Bakhtari

et al. 2021

Environ Sci Pollut Res

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In this study, , Cu), and Graphene Oxide (GO) /MIL-101(Fe,Cu) were synthesized to compose a novel sorbent. The adsorption properties of these three MOFs-based composites were compared toward the removal of phosphate. Furthermore, the influencing factors including reaction time, pH, temperature and initial concentration on the adsorption capacity of phosphate on these materials as well as the reusability of the material were discussed. The structure of fabricated materials and the removal mechanism of phosphate on the composite material were analyzed by Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption-desorption analysis and zeta potential. The results show that the maximum adsorption capacity of phosphate by the composite GO/MIL-101(Fe,Cu)-2% was 204.60 mg•g -1 , which is higher than that of MIL-101(Fe,Cu) and MIL-101(Fe). likewise the specific surface area of GO/MIL-101(Fe,Cu)-2% is 778.11 m 2 /g is higher than that of Cu) and ,which are 747.75 and 510.66m 2 /g respectively. The adsorption mechanism of phosphate is electrostatic attraction, form coordination bonds and hydrogen bonds. The fabricated material is a promising adsorbent for the removal of phosphate with good reusability.

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“…Figure 2 shows FTIR spectra of Fe 3 O 4 , NH 2 Cs, ATP and ATP@Fe 3 O 4 -NH 2 Cs composite. The spectrum of Fe 3 O 4 reveals absorption broad at 3437 cm −1 which is ascribed to stretching vibration of –OH − group 43 . In addition, the detected bands at 1639 and 892 cm −1 are assigned to –OH − bending and vibrating modes, correspondingly 44 .…”

Section: Resultsmentioning

confidence: 99%

Fabrication of attapulgite/magnetic aminated chitosan composite as efficient and reusable adsorbent for Cr (VI) ions

Eltaweil

El-Monaem

Eldin

et al. 2021

Sci Rep

Self Cite

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An efficient composite was constructed based on aminated chitosan (NH2Cs), attapulgite (ATP) clay and magnetic Fe3O4 for adsorptive removal of Cr(VI) ions. The as-fabricated ATP@Fe3O4-NH2Cs composite was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Thermal Gravimetric Analyzer (TGA), Scanning Electron Microscope (SEM), Zeta potential (ZP), Vibrating Sample Magnetometer (VSM), Brunauer–Emmett–Teller method (BET) and X-ray photoelectron spectroscope (XPS). A significant improve in the adsorption profile was established at pH 2 in the order of ATP@Fe3O4-NH2Cs(1:3) > ATP@Fe3O4-NH2Cs(1:1) > ATP@Fe3O4-NH2Cs(3:1) > Fe3O4-NH2Cs > ATP. The maximum removal (%) of Cr(VI) exceeded 94% within a short equilibrium time of 60 min. The adsorption process obeyed the pseudo 2nd order and followed the Langmuir isotherm model with a maximum monolayer adsorption capacity of 294.12 mg/g. In addition, thermodynamics studies elucidated that the adsorption process was spontaneous, randomness and endothermic process. Interestingly, the developed adsorbent retained respectable adsorption properties with acceptable removal efficiency exceeded 58% after ten sequential cycles of reuse. Besides, the results hypothesize that the adsorption process occurs via electrostatic interactions, reduction of Cr(VI) to Cr(III) and ion-exchanging. These findings substantiate that the ATP@Fe3O4-NH2Cs composite could be effectively applied as a reusable adsorbent for removing of Cr(VI) ions from aqueous solutions.

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Ultra-high adsorption capacity and selective removal of Congo red over aminated graphene oxide modified Mn-doped UiO-66 MOF

Cited by 151 publications

References 60 publications

Characterization and efficient dye discoloration of Algerian diatomite from Ouled Djilali-Mostaganem

Characterization and efficient dye discoloration of Algerian diatomite from Ouled Djilali-Mostaganem

Preparation of GO/MIL-101(Fe,Cu) composite and its adsorption mechanisms for phosphate in aqueous solution

Fabrication of attapulgite/magnetic aminated chitosan composite as efficient and reusable adsorbent for Cr (VI) ions

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