Magnetically separable iron oxide nanostructures-TiO2 nanofibers hierarchical heterostructures: controlled fabrication and photocatalytic activity

Wang, Heng‐guo; Fei, Xiaoliang; Li, Yapeng; Xu, Shufei; Sun, Mingda; Sun, Lei; Zhang, Chaoqun; Li, Yaoxian; Yang, Qingbiao; Wei, Yen

doi:10.1039/c1nj20051h

Cited by 30 publications

(17 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This justified the improvement in photocatalytic activity of Fe 2 O 3 -TiO 2 as compared to P25. However, a slight detrimental in textural properties was noted from first to fifth cycles of reused Fe 2 O 3 -TiO 2 due to adsorption of impurities onto the photocatalyst (Wang et al, 2011).…”

Section: Comparative Characteristics Of Reused and Fresh Fe 2 O 3 -Tiomentioning

confidence: 99%

“…11) for fresh and reused Fe 2 O 3 -TiO 2 indicated that both samples were ferromagnetic (Pang et al, 2016). Other magnetic properties of the samples are presented in Table 5 (Wang et al, 2011). On the other hand, the difference in M s values between fresh and reused Fe 2 O 3 -TiO 2 could be due to the presence of post-treatment impurities adsorbed on the photocatalyst surface and trapped within the pores of the reused Fe 2 O 3 -TiO 2 .…”

Section: Comparative Characteristics Of Reused and Fresh Fe 2 O 3 -Tiomentioning

confidence: 99%

See 1 more Smart Citation

Photocatalytic degradation of industrial pulp and paper mill effluent using synthesized magnetic Fe 2 O 3 -TiO 2 : Treatment efficiency and characterizations of reused photocatalyst

Subramonian

Chai

2017

Journal of Environmental Management

118

View full text Add to dashboard Cite

In this work, heterogeneous photocatalysis was used to treat pulp and paper mill effluent (PPME). Magnetically retrievable FeO-TiO was fabricated by employing a solvent-free mechanochemical process under ambient conditions. Findings elucidated the successful incorporation of FeO into the TiO lattice. FeO-TiO was found to be an irregular and slightly agglomerated surface morphology. In comparison to commercial P25, FeO-TiO exhibited higher ferromagnetism and better catalyst properties with improvements in surface area (58.40 m/g), pore volume (0.29 cm/g), pore size (18.52 nm), and band gap (2.95 eV). Besides, reusability study revealed that FeO-TiO was chemically stable and could be reused successively (five cycles) without significant changes in its photoactivity and intrinsic properties. Additionally, this study demonstrated the potential recovery of FeO-TiO from an aqueous suspension by using an applied magnetic field or sedimentation. Interactive effects of photocatalytic conditions (initial effluent pH, FeO-TiO dosage, and air flow-rate), reaction mechanism, and the presence of chemical oxidants (HO, BrO, and HOCl) during the treatment process of PPME were also investigated. Under optimal conditions (initial effluent pH = 3.88, [FeO-TiO] = 1.3 g/L, and air flow-rate = 2.28 L/min), the treatment efficiency of FeO-TiO was 98.5% higher than the P25. Based on Langmuir-Hinshelwood kinetic model, apparent rate constants of FeO-TiO and P25 were 9.2 × 10 and 2.7 × 10 min, respectively. The present study revealed not only the potential of using magnetic FeO-TiO in PPME treatment but also demonstrated high reusability and easy separation of FeO-TiO from the wastewater.

show abstract

Section: Comparative Characteristics Of Reused and Fresh Fe 2 O 3 -Tiomentioning

confidence: 99%

Section: Comparative Characteristics Of Reused and Fresh Fe 2 O 3 -Tiomentioning

confidence: 99%

Photocatalytic degradation of industrial pulp and paper mill effluent using synthesized magnetic Fe 2 O 3 -TiO 2 : Treatment efficiency and characterizations of reused photocatalyst

Subramonian

Chai

2017

Journal of Environmental Management

118

View full text Add to dashboard Cite

show abstract

“…Other haematite-based magnetically separable nanostructured photocatalysts such as graphene (GR)-α-Fe 2 O 3 -ZnO [93], α-Fe 2 O 3 /TiO 2 nanofibres [94], α-Fe 2 O 3 /RGO [95], and α-Fe 2 O 3 /ZnO [96] have been fabricated, have shown remarkable visible light utilisation, and have been easily separable using an external magnetic field. Coupling the various semiconductors with α-Fe 2 O 3 resulted in synergy between the materials, leading to enhanced visible light response, improved charge separation, and an overall increase in photocatalytic activity.…”

Section: Haematite (α-Fe2o3)-based Magnetic Photocatalystsmentioning

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

“…Previous studies also reported that formation of a satellite peak around 718.8 eV was a good indication of the existence of Fe 2 O 3. However, such a peak is not clearly observable between 2p3/2 and 2p1/2 components. The peak noticed around 728.49 eV cannot be assigned to Fe 3+ satellite peak, instead it may be due to concomitant processes such as photoemission and unresolved multiplet splitting .…”

Section: Resultsmentioning

confidence: 99%

Characteristics of iron‐loaded TiO₂‐supported montmorillonite catalysts: β‐Naphthol degradation under UV‐A irradiation

Ökte

Tuncel

Pekcan

et al. 2014

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND: In this study, a ternary system was synthesized by Fe loading on TiO 2 -supported montmorillonite catalysts (Fe-TiO 2 -MMT) and characterized by various means. The catalytic activities of the supported catalysts were examined in the presence of -Naphthol molecule under UV-A irradiation. RESULTS: The in situ growth of TiO 2 nanoparticles and Fe species on the MMT surface varied the morphology of the raw clay. The supported catalysts exhibited higher surface areas, pore volumes and extended absorption profiles through longer wavelengths. The mesoporous structures of the supported catalysts improved their dark adsorption capacities and degradation abilities. The mixed valence existence of Fe enhanced the electron transfer reactions in the catalytic runs. Kinetics was controlled by following a Langmuir-Hinshelwood model. CONCLUSION: The repeatability of the photocatalytic reactions provides an important practical advantage in the use of as-prepared supported catalysts.

show abstract

Magnetically separable iron oxide nanostructures-TiO2 nanofibers hierarchical heterostructures: controlled fabrication and photocatalytic activity

Cited by 30 publications

References 52 publications

Photocatalytic degradation of industrial pulp and paper mill effluent using synthesized magnetic Fe 2 O 3 -TiO 2 : Treatment efficiency and characterizations of reused photocatalyst

Photocatalytic degradation of industrial pulp and paper mill effluent using synthesized magnetic Fe 2 O 3 -TiO 2 : Treatment efficiency and characterizations of reused photocatalyst

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

Characteristics of iron‐loaded TiO₂‐supported montmorillonite catalysts: β‐Naphthol degradation under UV‐A irradiation

Contact Info

Product

Resources

About

Magnetically separable iron oxide nanostructures-TiO2 nanofibers hierarchical heterostructures: controlled fabrication and photocatalytic activity

Cited by 30 publications

References 52 publications

Photocatalytic degradation of industrial pulp and paper mill effluent using synthesized magnetic Fe 2 O 3 -TiO 2 : Treatment efficiency and characterizations of reused photocatalyst

Photocatalytic degradation of industrial pulp and paper mill effluent using synthesized magnetic Fe 2 O 3 -TiO 2 : Treatment efficiency and characterizations of reused photocatalyst

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

Characteristics of iron‐loaded TiO2‐supported montmorillonite catalysts: β‐Naphthol degradation under UV‐A irradiation

Contact Info

Product

Resources

About

Characteristics of iron‐loaded TiO₂‐supported montmorillonite catalysts: β‐Naphthol degradation under UV‐A irradiation