Heavy metal removal by using ZnO/organic and ZnO/inorganic nanocomposite heterostructures

Salehi-Babarsad, Farzad; Derikvand, Ehsan; Razaz, Majid; Yousefi, Ramin; Shirmardi, Abbas

doi:10.1080/03067319.2019.1639685

Cited by 23 publications

(6 citation statements)

References 44 publications

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“…Zolfaghari et al 18 have found that that higher adsorption capacity of 2.52 mmol/g for ZnO/coated nanoporous carbon was responsible for 90% Pb(II) removal from the aqueous solution compared to ZnO alone with 2.38 mmol/g and 78% removal efficiency under the applied conditions. Salehi-Babarsad et al 19 employed have applied ZnO/polyaniline and ZnO/graphene oxide composites for the removal of heavy metal ions, such as Cr 6+ , Cr 3+ , Cu 2+ and Fe 3+ in aqueous solution. The authors established that support materials (polyaniline and graphene oxide) contributed to the high adsorptive capacity of ZnO nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

The role of kaolin and kaolin/ZnO nanoadsorbents in adsorption studies for tannery wastewater treatment

Mustapha

Tijani

Ndamitso

et al. 2020

Sci Rep

100

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In the present study, comparative studies of kaolin and kaolin/ZnO nanocomposites for the adsorption of Cr(VI), Fe(III), COD, BOD, and chloride from tannery wastewater were investigated. ZnO nanoparticles and kaolin/ZnO nanocomposites were prepared by sol-gel followed by wetimpregnation methods. The prepared adsorbents were characterized using different analytical tools such as X-ray diffraction, Fourier transforms infrared, high-resolution transmission electron microscopy, energy dispersive spectroscopy, selective area electron diffraction and Brunauer Emmett-Teller (BET) and X-ray Photoelectron Spectroscopy (XPS). The HRSEM/EDS/XPS analysis confirmed successful immobilization of clay structural network on the lattice layers of zincite hexagonal structure of ZnO nanoparticles. BET measurement showed an increase in the surface area of kaolin/ ZnO nanocomposites (31.8 m 2 /g) when compared to kaolin (17 m 2 /g). Batch adsorption studies were carried out by varying the parameters such as contact time, adsorbent dosage and temperature. The maximum removal of Cr(VI) (100%), Fe(III) (98%), COD (95%), BOD (94%) and Chloride (78%) was obtained at 15 min by kaolin/ZnO composites. While 78% Cr(VI), 91% Fe(III), 91% COD, 89% BOD and 73% Chloride were removed by kaolin under the same conditions. The kaolin/ZnO nanocomposites exhibited better adsorption performance than kaolin due to higher surface area of the former than the latter. It was found that the Jovanovic isotherm model fitted the adsorption experimental data most with the highest correlation (R 2 > 0.99) for both nanoadsorbents and indicate the occurrence of adsorption on monolayer and heterogeneous surfaces. The mechanism for the adsorption of metal ions in tannery wastewater onto the nano-adsorbents was examined using Weber Morris intra-particle diffusion model and Boyd plot which showed that the adsorption process was both intra-particle and film diffusion controlled. The thermodynamic parameters such as enthalpy change showed that that adsorption of metal ions and other parameters was feasible, spontaneous and endothermic. The ZnO/ clay nanocomposites exhibited excellent recyclable and re-useable properties even after six repeated applications and can, therefore, be applied in wastewater treatment for removal of heavy metals and other physicochemical parameters. Environmental contamination via natural and anthropogenic activities have been recognized as one of the major global problems confronting the human race and aquatic species. Industrial manufacturing processes utilize a high amount of clean water during operations and at the same time generate and discharge a large volume of untreated wastewater into water bodies. Specifically, industrial tanning process which transforms animal hides and skins into leather generate highly turbid, coloured and foul-smelling wastewater containing different organic

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Section: Introductionmentioning

confidence: 99%

The role of kaolin and kaolin/ZnO nanoadsorbents in adsorption studies for tannery wastewater treatment

Mustapha

Tijani

Ndamitso

et al. 2020

Sci Rep

100

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“…ZnO NPs were prepared as described in our previous work (9). The prepared ZnO NPs were used as a support for preparing the nanocomposites.…”

Section: Synthesismentioning

confidence: 99%

“…The prepared ZnO NPs were used as a support for preparing the nanocomposites. ZnO/GO was prepared as described earlier (9,38). For preparing ZnO/GO/Zeolite or GO/Zeolite nanocomposites, at first, the purchased zeolites were washed with plenty of ultra-pure water to remove ionic salts within the zeolite pores.…”

Section: Synthesismentioning

confidence: 99%

“…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%

“…Zinc oxide NPs are reported as good nanoadsorbents in this regard; hence, several studies have used these compounds as good photocatalytic material and adsorbent, but due to agglomeration of ZnO NPs, it is necessary to use substrates, such as GO, zeolites, and the other organic polymers (30)(31)(32)(33)(34)(35)(36)(37)(38)(39). Meanwhile, the application of inorganic substrates is favored because of less toxicity and ease of preparation compared to the organic substrates (9). In this work, two different inorganic substrates (zeolites and GO sheets) were impregnated with zinc oxide NPs to overcome the agglomeration problem of ZnO NPs and hence to enhance its textural properties to achieve a better chloroform removal efficiency.…”

Section: Introductionmentioning

confidence: 99%

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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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Role of Zinc Oxide Nanomaterials for Photocatalytic Degradation of Environmental Pollutants

Wassie,

Ahmed,

Bachheti

et al. 2024

Metal and Metal-Oxide Based Nanomaterials

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Heavy metal removal by using ZnO/organic and ZnO/inorganic nanocomposite heterostructures

Cited by 23 publications

References 44 publications

The role of kaolin and kaolin/ZnO nanoadsorbents in adsorption studies for tannery wastewater treatment

The role of kaolin and kaolin/ZnO nanoadsorbents in adsorption studies for tannery wastewater treatment

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

Role of Zinc Oxide Nanomaterials for Photocatalytic Degradation of Environmental Pollutants

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