Use of metal oxides for the adsorptive removal of toxic organic pollutants

Nagpal, Mudita; Kakkar, Rita

doi:10.1016/j.seppur.2018.10.016

Cited by 106 publications

(53 citation statements)

References 169 publications

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“…Different methods have been reported for environmental remediation, including membrane filtration, electrochemical technologies, chemical precipitation, ion exchange, adsorption, and biological methods . Among all the methods reported, adsorption is a widely used method due to its simplicity, high efficiency, insensitivity to toxic pollutants and low energy requirements.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive Degradation of Phosmet Using Hierarchically Porous Calcium Oxide : An Experimental and Theoretical Study

Nagpal

Kakkar

2020

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The potential of hierarchically porous calcium oxide (HrÀ CaO) as a destructive adsorbent for organophosphate pesticides has been explored in this work. HrÀ CaO has been synthesized via an environment friendly precipitation method using water/ glycerol as the solvent system and gelatin as a template. Asprepared CaO exhibits a hierarchically porous structure with a high surface area of 74.8 m 2 g À 1 . The adsorption of phosmet on HrÀ CaO obeys pseudo-second order kinetics and is described well by the Langmuir adsorption isotherm model. Thermodynamic studies further explain the adsorption process to be exothermic and spontaneous. Fourier transform infrared (FTIR), Scanning electron microscopy (SEM) and Xray diffraction (XRD) analysis of HrÀ CaO after phosmet adsorption and the fragmentation pattern of phosmet obtained through mass spectrometric studies suggest chemical interaction of phosmet with HrÀ CaO. Density functional theory (DFT) studies further confirm highly exothermic destructive phosmet adsorption and degradation products matching the peaks obtained in the mass spectrum.

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Section: Introductionmentioning

confidence: 99%

Adsorptive Degradation of Phosmet Using Hierarchically Porous Calcium Oxide : An Experimental and Theoretical Study

Nagpal

Kakkar

2020

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“…One of the well-known catalysts for chloroform removal is Pt/Pd NPs., which are not cost-effective for commercial applications (8). Hydro-dechlorination is another approach to degrade chloroform; however, this method requires a high-temperature treatment (9)(10)(11)(12)(13)(14)(15)(16), indicating that this method is not a cost-effective alternative. Moreover, this method has the drawback of producing toxic byproducts such as phosgene and furan (17,18).…”

Section: Introductionmentioning

confidence: 99%

Cheap Nano-Adsorbents Based on Zno/Mineral Nanocomposites for Removal of Chloroform from Water Solution

Salehi-Babarsad

Derikvand

Razaz

et al. 2020

Jundishapur J Health Sci

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Background: Chloroform, as a hazardous chemical, can contaminate water resources via the reaction of chlorine as an antiseptic chemical with humic acids resulted from agricultural activities. In humans, chloroform may cause dizziness, heart disorders, and disorders of the nervous system. Hence, its removal is of crucial importance. Objectives: The current study aimed to propose cheap and efficient adsorbents to remove chloroform from water. Methods: Four different nanomaterials (ZnO, ZnO/graphene oxide (ZnO/GO), ZnO/GO/Zeolite, and GO/Zeolite nanocomposites) were prepared and characterized with X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) images. Textural properties of the nano- adsorbents were evaluated using Brunauer Emmet Teller (BET) and Barrett-Joyner-Halenda (BJH) techniques. Different isotherms and kinetic models were studied. The effect of pH on the removal efficiency of the nano-adsorbents was tested. Regenerability of the nano-adsorbents towards the removal of the chloroform was also evaluated. Results: XRD patterns and FESEM images of the nanocomposites confirmed lattice structures and nanoscale particle size of the prepared nanocomposites. According to the BET and BJH models, all samples had mesoporous structures. The BJH cumulative surface area of pores of ZnO, ZnO/GO, ZnO/GO/Zeolite, and GO/Zeolite nanocomposites were 8.5, 26.4, 17.2, and 20.8 m2/g, respectively. The best removal speed and efficiency were obtained according to the different isotherm and kinetic models for the removal of chloroform ZnO/GO nanocomposites. All adsorbents revealed characteristic adsorption in the pH range of 7 to 8. Conclusion: The ZnO/GO, a cheap and efficient nanocomposite, showed the best performance to remove chloroform from water samples due to its superior textural property. Hence, it can be used to remove chloroform from water for up to 5 cycles.

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“…Recently, significant research efforts have been focused on the environmental application of manganese oxides MnO x (x = 1, 2, 4/3), because of their low cost, abundance, environmental friendliness, and high adsorption capacity [29,30]. In particular, manganese oxide/nanomaterials demonstrated oxidative and catalytic activity for the degradation of dyes and organic compounds from aqueous waste [31,32].…”

Section: Introductionmentioning

confidence: 99%

Reactive Black 5 Degradation on Manganese Oxides Supported on Sodium Hydroxide Modified Graphene Oxide

et al. 2019

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Sodium hydroxide-modified graphene oxide was used as manganese oxides support for the preparation of nanocomposites via a one-pot preparation route for the degradation of Reactive Black 5. The nanocomposites were characterized for their structure by X-ray diffraction, for their textural properties by Nitrogen adsorption, and for their surface chemistry by Fourier transform infrared spectroscopy, potentiometric titration, and thermal analysis measurements. The nanocomposites prepared showed to possess high activity for the degradation/oxidation of Reactive Black 5 at ambient conditions, without light irradiation, which was higher than that of the precursors manganese oxides and can be attributed to the synergistic effect of the manganese oxides and the modified graphene oxide.

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Use of metal oxides for the adsorptive removal of toxic organic pollutants

Cited by 106 publications

References 169 publications

Adsorptive Degradation of Phosmet Using Hierarchically Porous Calcium Oxide : An Experimental and Theoretical Study

Adsorptive Degradation of Phosmet Using Hierarchically Porous Calcium Oxide : An Experimental and Theoretical Study

Cheap Nano-Adsorbents Based on Zno/Mineral Nanocomposites for Removal of Chloroform from Water Solution

Reactive Black 5 Degradation on Manganese Oxides Supported on Sodium Hydroxide Modified Graphene Oxide

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