Tungsten-doped TiO 2 /reduced Graphene Oxide nano-composite photocatalyst for degradation of phenol: A system to reduce surface and bulk electron-hole recombination

Yadav, M.; Yadav, Ajay Kumar; Fernandes, R.; Popat, Yaksh; Orlandi, Michele; Dashora, Alpa; Kothari, D.C.; Miotello, A.; Ahuja, B.L.; Patel, N.

doi:10.1016/j.jenvman.2017.08.010

Cited by 78 publications

(24 citation statements)

References 38 publications

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“…In addition, the calculated band edges match the redox potentials of hydroxyl radical and superoxide anion (13). There are various studies reported in the literature on the photocatalytic activity of vanadium and nitrogen codoped-TiO 2 (6,8,(14)(15)(16). The extensive work carried out by our group indicated various factors contributing the enhancement in photocatalytic efficiency of VN-codoped TiO 2 under visible light irradiation (6).…”

Section: Introductionmentioning

confidence: 55%

“…For codoped xV4N samples the band gap value decreases with increase in V concentration while for 2VxN the narrowing is nearly same for all the concentration of N. This suggests that V doping is predominately effective in making TiO 2 more active in visible light range. The theoretical DFT calculation conducted in our past work on VN‐codopedTiO 2 indicates that N 2p states are formed just above the valance bands maxima (VBM) which merges with VB of TiO 2 to reduce the band gap by small amount as in case of 0V4N. For V doped TiO 2 , isolated charge states of V 3d orbitals are formed at 0.7–0.9 eV below the conduction band minima (CBM).…”

Section: Resultsmentioning

confidence: 98%

“…Scientists in the past have focused on modifying TiO 2 by doping foreign elements to reduce the band gap and/or to increase the lifetimes of the charge carriers . Metallic dopants such as V, Cu, Mg, W, Cr and nonmetallic dopants such as N, C, S are known to modify the bandgap by forming energy levels near to conduction band and valance band, respectively . Thus, these dopant levels effectively reduce the band gap of TiO 2 causing red shift in the absorption band and consequently increasing the visible light absorption.…”

Section: Introductionmentioning

confidence: 99%

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Roles of Vanadium and Nitrogen in Photocatalytic Activity of VN‐Codoped TiO₂ Photocatalyst

Varma

Yadav

Tiwari

et al. 2018

Photochem & Photobiology

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In the present manuscript, we explore the VN-codoped TiO system intended to understand the role played by each dopant in synergistic enhancement in performance of TiO photocatalyst. The photocatalytic decomposition of organic pollutants in aqueous solution under visible light was used as a probe reaction to evaluate the performance of VN-codoped TiO samples with different V and N concentrations. An optical measurement of VN-codoped TiO shows considerable improved visible light absorption with increase in V-concentration as compared to increase in N concentration, which was due to the effective narrowing of the band gap by V-doping. The energy levels formed by N-dopants act as the trapping centers for photogenerated holes to suppress recombination process as indicated by PL and TRPL results. It is also observed that at high V-concentrations recombination centers are created in the form of oxygen vacancies as indicated by XPS and PL. In VN-codoped TiO , addition of N partially fills these oxygen vacancies to reduce the number of recombination centers and prolong the lifetime of charge carriers. Thus, V improves the visible light absorption while N reduces the recombination of electron-hole pairs, thus creating the synergistic effect to produce three times better performance than pure TiO .

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Section: Introductionmentioning

confidence: 55%

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Roles of Vanadium and Nitrogen in Photocatalytic Activity of VN‐Codoped TiO₂ Photocatalyst

Varma

Yadav

Tiwari

et al. 2018

Photochem & Photobiology

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“…Out of the many semiconductor photocatalysts, titanium dioxide (TiO 2 ) is a favoured material to be utilized as photocatalyst for aqueous pollutant degradation and water splitting, owing to practical merits such as nontoxicity, good photochemical stability, and low material cost. 14,15 However, TiO 2 possesses critical issues, such as small surface area and poor light-absorption range because of itswide band gap. 16 Recently, advancements in the application of fibrous silica in hard template-assisted material fabrication has allowed TiO 2 to be synthesized with a higher surface area and larger particle size.…”

Section: Introductionmentioning

confidence: 99%

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

Zakaria

Hassan

Ibrahim

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND Heterogeneous photocatalysis has been demonstrated to be a promising alternative to treating emerging pollutants in wastewater. Phenol, an extremely toxic substance among existing pollutants, can cause long‐term unintended effects when improperly disposed. An effective measure to address this problem is to develop suitable heterojunctions. Among various photocatalyst, titanium dioxide (TiO2) appears to be an excellent photocatalyst in the degradation of organic pollutants. RESULTS Synthetization of well‐constructed heterojunction composite of niobium oxide (Nb2O5) and fibrous silica titania (FST) for enhanced photocatalytic degradation of phenol has been investigated. The photocatalytic performance demonstrated that 5 wt% Nb2O5 loaded on FST (5 Nb/FST) gave the maximum phenol degradation rate (1.70 × 10−2 mM min−1) of 10 mg L−1 phenol at pH 5 using 1000 mg L−1 catalyst within 180 min. Meanwhile, under the same conditions, 1 Nb/FST, FST, 10 Nb/FST and Nb2O5 only delivered 1.51 × 10−2, 1.30 × 10−2, 1.01 × 10−2 and 0.07 × 10−2 mM min−1, respectively. Further phenol photocatalytic degradation routes by 5 Nb/FST reveal that the main intermediates detected are hydroquinone, catechol, maleic, fumaric, and malonic acid. CONCLUSION In this work, 5 Nb2O5/FST composite, as an effective‐performance photocatalyst for phenol degradation, was well‐constructed. The advanced activity can primarily be attributed to the regulated Nb2O5 loading with FST and the effect of Nb/FST microsphere heterojunctions, synergistically. Besides, larger crystallite size, high impurity levels and Si‐O‐Nb and Nb–O–Ti bonds, offers excellent phenol degradation. © 2020 Society of Chemical Industry (SCI)

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“…TiO 2 'yi çeşitli organik ve inorganik maddelerle birleştirmek, fotolitik yükseltgenme ile oluşan serbest yük taşıyıcılarının tekrar birleşmesini engelleyerek fotokatalitik etkinliği iyileştirme potansiyeline sahiptir [1]. Organik maddelere örnek olarak, grafen oksit kompozit yapısı içerisinde TiO 2 fotokatalizör ile birleştirilerek, fotolitik yükseltgenme ile oluşan elektronların değerlilik bandına dönmesini engelleyen transfer kanalları oluşturulmuştur [16]. Karbon fiber yüzeyine TiO 2 kaplanarak, fotokatalizörün serbest yük taşıyıcılarının tekrar birleşme hızı azaltılmıştır ve ışık absorpsiyon kabiliyetinin gelişmesi sağlanmıştır [17].…”

Section: Giriş (Introduction)unclassified

Polivinil borat/TiO2 Nanokompozitlerin Fotokataliz Uygulaması

Köysüren

2019

Journal of Boron

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ÖZETPolivinil borat (PVB)/titanyum dioksit (TiO 2 ) nanokompozitler, polivinil alkol ve borik asit'in TiO 2 nanoparçacık varlığında çapraz bağlanma reaksiyonu ile sentezlenmiştir. Ağırlıkça %0, 10, 20 ve 30 oranında TiO 2 nanoparçacık içeren nanokompozitler elde edilmiştir ve hazırlanan nanokompozitlerin fotokatalitik etkinliği metilen mavisinin sudaki çözeltisinin UVA ışığı ve doğal güneş ışığı altındaki bozunumu ile ayrı ayrı çalışılmıştır. TiO 2 katkısı ile PVB'nin fotokatalitik etkinliği artmıştır. En yüksek fotokatalitik etkinlik, ağırlıkça %30 oranında TiO 2 içeren nanokompozit ile elde edilmiştir. FTIR analizi ile nanokompozitin kimyasal yapısı incelenmiştir. FTIR analizi ile, PVB ve TiO 2 içeren PVB nanokompozitlerin başarılı bir şekilde sentezlendiği gösterilmiştir. SEM ve TEM analizleri ile nanokompozitlerin morfolojisi detaylı bir şekilde incelenmiştir. TiO 2 nanoparçacıklarından oluşan 100 nm civarında kümeler TEM görüntülerinde gözlenmiştir. ABSTRACTPolyvinyl borate (PVB)/titanium dioxide nanocomposites were synthesized through the crosslinking reaction of polyvinyl alcohol and boric acid in the presence of TiO 2 nanoparticles. Nanocomposites containing 0, 10, 20 and 30 wt.% TiO 2 nanoparticles were obtained and the photocatalytic activity of the prepared nanocomposites was studied by the degradation of methylene blue in aqueous solution under UVA light and natural sun light, seperately. The photocatalytic activity of PVB increased with TiO 2 contribution. The highest photocatalytic activity was obtained with the nanocomposite containing 30 wt.% TiO 2 . The chemical structure of the nanocomposite was investigated by FTIR analysis. FTIR analysis reveals that PVB and TiO 2containing PVB nanocomposites were successfully synthesized. Morphology of the nanocomposites was studied in detail by SEM and TEM analyses. TiO 2 aggregates of about 100 nm were observed on TEM images.

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Tungsten-doped TiO 2 /reduced Graphene Oxide nano-composite photocatalyst for degradation of phenol: A system to reduce surface and bulk electron-hole recombination

Cited by 78 publications

References 38 publications

Roles of Vanadium and Nitrogen in Photocatalytic Activity of VN‐Codoped TiO₂ Photocatalyst

Roles of Vanadium and Nitrogen in Photocatalytic Activity of VN‐Codoped TiO₂ Photocatalyst

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

Polivinil borat/TiO2 Nanokompozitlerin Fotokataliz Uygulaması

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Tungsten-doped TiO 2 /reduced Graphene Oxide nano-composite photocatalyst for degradation of phenol: A system to reduce surface and bulk electron-hole recombination

Cited by 78 publications

References 38 publications

Roles of Vanadium and Nitrogen in Photocatalytic Activity of VN‐Codoped TiO2 Photocatalyst

Roles of Vanadium and Nitrogen in Photocatalytic Activity of VN‐Codoped TiO2 Photocatalyst

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

Polivinil borat/TiO2 Nanokompozitlerin Fotokataliz Uygulaması

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Roles of Vanadium and Nitrogen in Photocatalytic Activity of VN‐Codoped TiO₂ Photocatalyst

Roles of Vanadium and Nitrogen in Photocatalytic Activity of VN‐Codoped TiO₂ Photocatalyst