Photocatalytic degradation of azo dye acid red G by KNb3O8 and the role of potassium in the photocatalysis

Zhang, Gaoke; Gong, Jie; Zou, Xi; He, Fangsheng; Zhang, Hao; Zhang, Qiang; Liu, Ying; Xia, Yang; Hu, Bo

doi:10.1016/j.cej.2006.06.021

Cited by 55 publications

(35 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…3 do not show significant differences between KNb 3 O 8 synthesized by the PP and the SS methods. Bands observed between 1000 and 800 cm -1 are in excellent agreement with literature [12,14,16] and were assigned to the octahedral vibrations of NbO 6 . The broad absorption band around 700-400 cm -1 is related to the vibrations of corner-shared NbO 6 octahedra (700-600 cm -1 ) and the structural vibrations of Nb-O (600-400 cm -1 ) [12].…”

Section: Resultssupporting

confidence: 75%

“…KNb 3 O 8 is a layered niobate with orthorhombic structure (space group Aman), whose unit cell is formed by stacking of two lamellae along the crystallographic axis c, giving rise to only one type of interlayer region. Their lamellae are formed by distorted octahedra (NbO 6 ) sharing vertices and edges ( Fig. 1), with the lattice constants a=8.903 Å, b=21.16 Å and c=3.799 Å [5,8].…”

Section: Introductionmentioning

confidence: 99%

“…Niobates have been widely reported in the literature due to their interesting electro-optic, dielectric, piezoelectric and photocatalytic properties, which allow their use as sensors, electronic devices and photocatalysts for water splitting and for photobleaching of organic dyes [1][2][3][4][5][6][7][8]. KNb 3 O 8 is a layered niobate with orthorhombic structure (space group Aman), whose unit cell is formed by stacking of two lamellae along the crystallographic axis c, giving rise to only one type of interlayer region.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Layered niobate KNb 3 O 8 synthesized by thepolymeric precursor method

et al. 2018

View full text Add to dashboard Cite

The polymeric precursor method was used for the synthesis of KNb 3 O 8 and compared to the solid-state method. The materials were characterized by X-ray diffraction (XRD), infrared spectroscopy, Raman spectroscopy, scanning electron microscopy, and determination of surface area and total pore volume by nitrogen isotherms at 77 K. The material prepared by the polymeric precursor method was single-phase while K 2 Nb 4 O 11 was obtained as secondary phase when the solidstate method was used, as evidenced by the XRD patterns and the Raman spectra. The morphology of the materials was significantly altered by the synthesis method, as the KNb 3 O 8 prepared by the polymeric precursor method presented a more porous morphology leading to a higher surface area and pore volume.

show abstract

Section: Resultssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Layered niobate KNb 3 O 8 synthesized by thepolymeric precursor method

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The removal efficiency of BP at the initial dosage of 0.01 g, increased from 77% at the second minute of contact to 95% at time equals to 30 min by keeping constant stirring, however, with rising LCFO dosage to 0.03 g the percentage of removal obtained in the second minute of stirring was 88%, and the most percent of removal (98%) was attained when the stirring was continued till time equals to 15 min. The adsorbent dosage obtained in this study for complete removal of BP on to LCFO nanopowder is less than most of the reported values in the literatures for dye adsorption using other adsorbents (Moussavi and Mahmoudi, 2009;Song et al, 2008;Kong et al, 2009;Zhang et al, 2006). …”

Section: Effect Of Contact Time and Adsorbent Dosagementioning

confidence: 64%

Synthesis and Evaluation Catalytic Efficiency of Perovskite-Type Oxide Nanopowders in Removal of Bromocresol Purple from Aqueous Solution

Tavakkoli¹,

Ghaemi²,

Mostofizadeh³

2014

IJSRK

View full text Add to dashboard Cite

Abstract. A 1-x A x BO 3 belongs to the perovskite oxides of the ABO 3 structure. In this study, nanoparticles of La 0.5 Ca 0.5 FeO 3 were fabricated by sol-gel citrate technique. A series of common analytical techniques were used to characterize the crystallinity, morphology, specific surface area, and grain size of the nanopowders. These properties were characterised by means of XRD, SEM, EDX and FTIR. The calculated particles size using the Scherrer's formula was about 20 nm. Moreover, the family of perovskite-type oxides could be considered as an adsorbent/catalyst material for the removal of dyes. This study has also investigated the efficiency of La 0.5 Ca 0.5 FeO 3 , as an adsorbent for removal of dye (Bromocresol Purple (BP)), from an aqueous solution. The adsorption studies were carried out at different pH values, various adsorbent dosages and contact time in a batch experiments. The kinetic studies indicate that the removal process obeys the Pseudo-first-order kinetic equation. Also, the isotherm evaluations reveal that the adsorption of BP by the nanoparticles follows the Langmuir model. In addition, this nanoparticle with good specific affinity towards dye molecules was a promising adsorbent for dye removal from natural water.

show abstract

“…[1][2][3][4] Among these compounds, the KNb 3 O 8 potassium triniobate phase (see crystal data in Table 1; 5 energy gap: 3.7 eV) 6 shows luminescence, 7,8 and excellent UV photocatalytic activity for degradation of dyes, 9,10 for catalytic synthesis of monoethylene glycol (used as intermediate for polyester ber production), 11 and for catalytic reduction of CO 2 in methane. higher UV photocatalytic activity that their bulk counterpart for degradation of organic contaminants, reduction of CO 2 and decontamination of water.…”

Section: Introductionmentioning

confidence: 99%

Epitaxial growth and cationic exchange properties of layered KNb₃O₈thin films

et al. 2017

View full text Add to dashboard Cite

The KNb 3 O 8 potassium triniobate phase is a layered compound that shows excellent photocatalytic activity, intercalation properties and electrochemical performances. In this study, we report the synthesis of this niobate in thin film form. Thin films of layered KNb 3 O 8 phase were grown by pulsed laser deposition on (100)-oriented strontium titanate SrTiO 3 substrates using targets with different compositions and various deposition parameters. Samples were analyzed by X-ray diffraction, scanning and transmission electron microscopy, X-ray energy dispersive and Rutherford backscattering spectroscopies. This work shows that

show abstract

Photocatalytic degradation of azo dye acid red G by KNb3O8 and the role of potassium in the photocatalysis

Cited by 55 publications

References 42 publications

Layered niobate KNb 3 O 8 synthesized by thepolymeric precursor method

Layered niobate KNb 3 O 8 synthesized by thepolymeric precursor method

Synthesis and Evaluation Catalytic Efficiency of Perovskite-Type Oxide Nanopowders in Removal of Bromocresol Purple from Aqueous Solution

Epitaxial growth and cationic exchange properties of layered KNb₃O₈thin films

Contact Info

Product

Resources

About

Photocatalytic degradation of azo dye acid red G by KNb3O8 and the role of potassium in the photocatalysis

Cited by 55 publications

References 42 publications

Layered niobate KNb 3 O 8 synthesized by thepolymeric precursor method

Layered niobate KNb 3 O 8 synthesized by thepolymeric precursor method

Synthesis and Evaluation Catalytic Efficiency of Perovskite-Type Oxide Nanopowders in Removal of Bromocresol Purple from Aqueous Solution

Epitaxial growth and cationic exchange properties of layered KNb3O8thin films

Contact Info

Product

Resources

About

Epitaxial growth and cationic exchange properties of layered KNb₃O₈thin films