Accelerated photocatalytic degradation of organic pollutants over carbonate-rich lanthanum-substituted zinc spinel ferrite assembled reduced graphene oxide by ultraviolet (UV)-activated persulfate

Abstract Titanium dioxide has been widely used for photocatalytic degradation of organic pollutants in air, while problems like low utilization rate of sunlight and easy recombination of photogenerated electrons and holes are the main drawbacks for its application. In this study, a combination of Co doping and graphene supporting was used to synthesize cobalt doping titanium dioxide fiber supported by reduced graphene oxide (Co-TiO2/RGO) using processes including electrospinning, heating and freeze-drying. The structural and textural features of Co-TiO2/RGO were characterized by different techniques, and toluene was used as a model pollutant to test its photocatalytic performance. Results show that Co-TiO2 is uniformly dispersed in reduced grapheme oxide and the specific surface area of Co-TiO2/RGO is higher than that of TiO2 and Co-TiO2. Further, under the conditions of Co doping amount of 1%, calcination of 600℃ for 4 h, gas residence time of 100 min, relative humidity of 100%, and the Co-TiO2 loading amount of 1 g, the degradation percentage of toluene by Co-TiO2/RGO was the highest, up to 99.1%. This study confirms the possibility of synthesizing Co-TiO2/RGO for the degradation of organic pollutants in air.

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Superparamagnetic ZnFe2O4 Nanoparticles-Reduced Graphene Oxide-Polyurethane Resin Based Nanocomposites for Electromagnetic Interference Shielding Application

Nanomaterials ◽

10.3390/nano11051112 ◽

2021 ◽

Vol 11 (5) ◽

pp. 1112

Author(s):

Raghvendra Singh Yadav ◽

Anju ◽

Thaiskang Jamatia ◽

Ivo Kuřitka ◽

Jarmila Vilčáková ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Electromagnetic Waves ◽

Spinel Ferrite ◽

Ferrite Nanoparticles ◽

Resin Matrix ◽

Polyurethane Resin ◽

Reduced Graphene ◽

Znfe2o4 Nanoparticles ◽

Electromagnetic Pollution

Superparamagnetic ZnFe2O4 spinel ferrite nanoparticles were prepared by the sonochemical synthesis method at different ultra-sonication times of 25 min (ZS25), 50 min (ZS50), and 100 min (ZS100). The structural properties of ZnFe2O4 spinel ferrite nanoparticles were controlled via sonochemical synthesis time. The average crystallite size increases from 3.0 nm to 4.0 nm with a rise of sonication time from 25 min to 100 min. The change of physical properties of ZnFe2O4 nanoparticles with the increase of sonication time was observed. The prepared ZnFe2O4 nanoparticles show superparamagnetic behavior. The prepared ZnFe2O4 nanoparticles (ZS25, ZS50, and ZS100) and reduced graphene oxide (RGO) were embedded in a polyurethane resin (PUR) matrix as a shield against electromagnetic pollution. The ultra-sonication method has been used for the preparation of nanocomposites. The total shielding effectiveness (SET) value for the prepared nanocomposites was studied at a thickness of 1 mm in the range of 8.2–12.4 GHz. The high attenuation constant (α) value of the prepared ZS100-RGO-PUR nanocomposite as compared with other samples recommended high absorption of electromagnetic waves. The existence of electric-magnetic nanofillers in the resin matrix delivered the inclusive acts of magnetic loss, dielectric loss, appropriate attenuation constant, and effective impedance matching. The synergistic effect of ZnFe2O4 and RGO in the PUR matrix led to high interfacial polarization and, consequently, significant absorption of the electromagnetic waves. The outcomes and methods also assure an inventive and competent approach to develop lightweight and flexible polyurethane resin matrix-based nanocomposites, consisting of superparamagnetic zinc ferrite nanoparticles and reduced graphene oxide as a shield against electromagnetic pollution.

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Magnetically separable reduced graphene oxide/iron oxide nanocomposite materials for environmental remediation

Catalysis Science & Technology ◽

10.1039/c4cy00806e ◽

2014 ◽

Vol 4 (12) ◽

pp. 4396-4405 ◽

Cited By ~ 85

Author(s):

Teo Peik-See ◽

Alagarsamy Pandikumar ◽

Lim Hong Ngee ◽

Huang Nay Ming ◽

Chia Chin Hua

Keyword(s):

Methylene Blue ◽

Graphene Oxide ◽

Iron Oxide ◽

Photocatalytic Degradation ◽

Reduced Graphene Oxide ◽

Environmental Remediation ◽

Nanocomposite Materials ◽

Reduced Graphene ◽

Magnetically Separable

Synthesis of magnetically separable rGO/Fe3O4nanocomposite materials for environmental remediationviathe photocatalytic degradation of methylene blue.

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