Magnetic titanium dioxide based nanomaterials: synthesis, characteristics, and photocatalytic application in pollutant degradation

Yao, Hongbao; Fan, Maohong; Wang, Yujun; Luo, Guangsheng; Fei, Weiyang

doi:10.1039/c5ta03215f

Cited by 85 publications

(34 citation statements)

References 129 publications

(165 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, it is necessary to bring into perspective the current developments in the tailoring and application of such materials in water treatment. A few reviews are available mainly on the synthesis, structure, and various applications of magnetic materials [83][84][85][86][87][88]. This review exclusively discusses the most recent developments in terms of the synthesis and exploitation of various magnetic nanocomposite photocatalysts in water pollution mitigation.…”

Section: Introductionmentioning

confidence: 99%

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Mamba

Mishra

2016

Catalysts

View full text Add to dashboard Cite

Organic and inorganic compounds utilised at different stages of various industrial processes are lost into effluent water and eventually find their way into fresh water sources where they cause devastating effects on the ecosystem due to their stability, toxicity, and non-biodegradable nature. Semiconductor photocatalysis has been highlighted as a promising technology for the treatment of water laden with organic, inorganic, and microbial pollutants. However, these semiconductor photocatalysts are applied in powdered form, which makes separation and recycling after treatment extremely difficult. This not only leads to loss of the photocatalyst but also to secondary pollution by the photocatalyst particles. The introduction of various magnetic nanoparticles such as magnetite, maghemite, ferrites, etc. into the photocatalyst matrix has recently become an area of intense research because it allows for the easy separation of the photocatalyst from the treated water using an external magnetic field. Herein, we discuss the recent developments in terms of synthesis and photocatalytic properties of magnetically separable nanocomposites towards water treatment. The influence of the magnetic nanoparticles in the optical properties, charge transfer mechanism, and overall photocatalytic activity is deliberated based on selected results. We conclude the review by providing summary remarks on the successes of magnetic photocatalysts and present some of the future challenges regarding the exploitation of these materials in water treatment.

show abstract

Section: Introductionmentioning

confidence: 99%

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Mamba

Mishra

2016

Catalysts

View full text Add to dashboard Cite

show abstract

“…The drastic difference in the intensity signals indicates a different amount of solvent that increased from sample A to D. Indeed, this result agree well with the surface area analysis from BET isotherms (Table 1), where the increased value of the surface to mass ratio from A to D, implies an increment of the possibility to adsorb the solvent. Samples A and B had no supplementary signals, demonstrating a complete crystallization already at 150 °C, a temperature notably lower with respect to the literature data [1,26]. On the contrary, samples C and D possessed weak exothermic peaks at 385 °C, correlated with the phase transition of the particles from amorphous to the tetragonal anatase structure.…”

Section: Resultsmentioning

confidence: 53%

“…Generally, a thick SiO 2 layer is inserted between the internal core (Fe 3 O 4 ) and the external catalyst (TiO 2 ) to prevent the Fe 3 O 4 -TiO 2 direct contact that would decrease the photodegradation activity [22,23,24,25]. Indeed, it has been demonstrated that the TiO 2 surface area decreased if supported on a magnetic substrate [26]. Consequently, our attention was focused to the possibility of using, in the titania sol-gel synthesis route, very small amounts of magnetite, exploited as germination seeds affecting the nucleation, formation, and morphology of the TiO 2 NPs.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of TiO2 NPs Activity by Fe3O4 Nano-Seeds for Removal of Organic Pollutants in Water

et al. 2016

View full text Add to dashboard Cite

The enhancement of the photocatalytic activity of TiO2 nanoparticles (NPs), synthesized in the presence of a very small amount of magnetite (Fe3O4) nanoparticles, is here presented and discussed. From X-ray diffraction (XRD) and differential scanning calorimetry (DSC) analyses, the crystallinity of TiO2 nanoparticles (NPs) seems to be affected by Fe3O4, acting as nano-seeds to improve the tetragonal TiO2 anatase structure with respect to the amorphous one. Photocatalytic activity data, i.e., the degradation of methylene blue and the Ofloxacin fluoroquinolone emerging pollutant, give evidence that the increased crystalline structure of the NPs, even if correlated to a reduced surface to mass ratio (with respect to commercial TiO2 NPs), enhances the performance of this type of catalyst. The achievement of a relatively well-defined crystal structure at low temperatures (Tmax = 150 °C), preventing the sintering of the TiO2 NPs and, thus, preserving the high density of active sites, seems to be the keystone to understand the obtained results.

show abstract

“…12). Considering that the current magnetic nanoparticles preparation methods generally have low yields27282930, there is few large-scale industrial productions, resulting in high purchase costs. However, in most cases, this method needs only 6.0 mg Fe 3 O 4 NPs and 0.3 mg C 16 mimBr for 4 mL of sample solution and the total cost were less than 0.1 dollar.…”

Section: Resultsmentioning

confidence: 99%

Platform construction and extraction mechanism study of magnetic mixed hemimicelles solid-phase extraction

Xiao

Zhang

et al. 2016

Sci Rep

View full text Add to dashboard Cite

Simple, accurate and high-throughput pretreatment method would facilitate large-scale studies of trace analysis in complex samples. Magnetic mixed hemimicelles solid-phase extraction has the power to become a key pretreatment method in biological, environmental and clinical research. However, lacking of experimental predictability and unsharpness of extraction mechanism limit the development of this promising method. Herein, this work tries to establish theoretical-based experimental designs for extraction of trace analytes from complex samples using magnetic mixed hemimicelles solid-phase extraction. We selected three categories and six sub-types of compounds for systematic comparative study of extraction mechanism, and comprehensively illustrated the roles of different force (hydrophobic interaction, π-π stacking interactions, hydrogen-bonding interaction, electrostatic interaction) for the first time. What’s more, the application guidelines for supporting materials, surfactants and sample matrix were also summarized. The extraction mechanism and platform established in the study render its future promising for foreseeable and efficient pretreatment under theoretical based experimental design for trace analytes from environmental, biological and clinical samples.

show abstract

Magnetic titanium dioxide based nanomaterials: synthesis, characteristics, and photocatalytic application in pollutant degradation

Abstract: Recent advances in synthesis methods, structure and enhanced photoactivity of magnetic titanium dioxide based photocatalysts are highlighted in this review.

Cited by 85 publications

References 129 publications

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Enhancement of TiO2 NPs Activity by Fe3O4 Nano-Seeds for Removal of Organic Pollutants in Water

Platform construction and extraction mechanism study of magnetic mixed hemimicelles solid-phase extraction

Contact Info

Product

Resources

About