Synthesis of TiO2 and ZrO2/TiO2 Composite Microspheres and Their Photo‐Catalytic Degradation of Methylene Blue

Vai̇zoğullar, Ali İmran; Balcı, Ahmet; Uğurlu, Mehmet; Karaoğlu, M. Hamdi

doi:10.5578/fmbd.25229

Cited by 14 publications

(9 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Even though ZrO 2 is considered as a poor photocatalyst due to its wide bad gap around 5 eV, doping of ZrO 2 into TiO 2 was reported to boost the photocatalytic practicality of advanced ZrO 2 -TiO 2 mixed oxides [19]. TiO 2 doped by ZrO 2 was studied by many researchers [4,7,13,14,[16][17][18][19][20][21][22][23][24][25][26][27] in the form of photocatalysts or thin film. These hybrid photocatalysts were prepared using various methods including solgel, polymer gel templating, homogeneous precipitation, and hydrothermal.…”

Section: Introductionmentioning

confidence: 99%

Structural and photocatalytic properties of co-doped hybrid ZrO2–TiO2 photocatalysts

et al. 2019

View full text Add to dashboard Cite

In this study, pure TiO 2 , ZrO 2 , and hybrid ZrO 2 -TiO 2 photocatalysts were synthesized through solgel process and calcined at three different temperatures. The synthesized photocatalysts were characterized using powder X-ray diffraction (PXRD), field-emission scanning electron microscopy (FESEM), Brunauer-Emmet-Teller (BET), ultraviolet-visible (UV-Vis) spectrometer, and photoluminescence (PL) spectrometer. The PXRD patterns show that the rutile phase of TiO 2 was suppressed through co-doping with ZrO 2 and produced small crystallite size. The hybrid photocatalysts with small crystallite size recorded the highest surface area of 114.7 m 2 /g compared to pure TiO 2 and ZrO 2 photocatalysts as confirmed by BET analysis. Irregular size and shape was observed in the hybrid photocatalysts compared to spherical shape and size in TiO 2 and flaky shape in ZrO 2 as shown by the FESEM images. The optical properties of the photocatalysts investigated using UV-Vis spectroscopy showed a decrease in band gap energy of pure TiO 2 through linear extrapolation from the Tauc's plot despite the slightly higher band gap energy of the hybrid photocatalysts. However, PL analysis showed that doping of ZrO 2 into TiO 2 increased the separation efficiency of the electron-hole pairs and enhanced the photocatalytic activity. The phenol degradation of the hybrid ZrO 2 -TiO 2 photocatalysts was higher compared to those of the pure TiO 2 and ZrO 2 . Keywords Solgel • Hybrid TiO 2 -ZrO 2 photocatalysts • Phenol degradation

show abstract

Section: Introductionmentioning

confidence: 99%

Structural and photocatalytic properties of co-doped hybrid ZrO2–TiO2 photocatalysts

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Figure 4 shows the IR spectra of the samples in the range of 4000 to 500 cm −1 . The bands centered at 640 cm −1 , 605 cm −1 and 550 cm −1 are typical for TiO 2 (anatase phase) and correspond to the stretching modes from the Ti-OH, Ti-O and O-Ti-O bonds, respectively [39][40][41][42]. The bands located between 700 and 500 cm −1 are generally assigned to the stretching vibration modes characteristic of Ti-OH and Ti-O-Ti bonds.…”

Section: Ftirmentioning

confidence: 98%

Photocatalytic Degradation of Rhodamine B and Methylene Orange Using TiO2-ZrO2 as Nanocomposite

et al. 2021

View full text Add to dashboard Cite

The present research reports the synthesis of ZrO2-doped TiO2 photocatalysts at different ZrO2 contents (1, 3 and 5% wt.) synthesized by the sol–gel method. The samples were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction, attenuated total reflectance-Fourier transform infrared, ultraviolet–visible, X-ray photoelectron spectroscopy and N2 adsorption–desorption analysis. The photocatalytic activity of the ZrO2-doped TiO2 was investigated against the dyes methyl orange and rhodamine B through mineralization studies. The ZrO2-doped TiO2 samples presented a semiglobular-ovoid agglomerate shape around 500–800 nm. The samples presented high crystallinity of the TiO2 anatase phase, XPS suggested the formation of Zr–O–Ti bonds and the samples were classified as mesoporous materials with slight changes in the optical features in comparison with pure TiO2. Our study shows that the ZrO2-doped TiO2 composites exhibited a higher photocatalytic activity than just utilizing the synthetized TiO2 and a commercial P25. The different degradation behaviors are attributed to differences in the textural properties, and to the different optical absorptions of the samples due to structural defects created by the level of doping of Zr4+ ions into the TiO2 lattice. Reaction kinetics parameters were calculated by the Langmuir–Hinshelwood model, and a third run cycle of the ZrO2-doped TiO2 at 1% wt. achieved a photocatalytic degradation of 78.1 and 75.5% for RhB and MO, respectively.

show abstract

“…Quang xúc tác là một phương pháp được chú ý nghiên cứu cho quá trình oxi hóa phân hủy các chất hữu cơ độc hại ô nhiễm. TiO2 là một trong những xúc tác quang được sử dụng rộng rãi với hoạt tính xúc tác tương đối cao, ổn định, chi phí thấp và không độc hại [1][2][3][4]. Tuy nhiên, khả năng xúc tác quang của TiO2 bị hạn chế do năng lượng vùng cấm lớn (3,2 eV đối với pha anatase và 3,02 eV đối với pha rutile) nên chỉ hoạt động trong vùng tử ngoại [1].…”

Section: Giới Thiệu Chungunclassified

“…Gần đây, một số nghiên cứu cho thấy hệ oxit hỗn hợp TiO2-ZrO2 có kích thước nanomet cho khả năng xúc tác tốt hơn so với từng oxit riêng lẻ [1][2][3][4]. ZrO2 là xúc tác axit và là chất bán dẫn loại n [3,4]. Do đó TiO2 và ZrO2 có khả năng hỗ trợ nhau về tính axit -bazơ và giảm năng lượng vùng cấm khi tạo thành hệ ghép.…”

Section: Giới Thiệu Chungunclassified

“…Điều này có thể được giải thích do : (i) các hạt ZrO 2 được phân tán vào TiO 2 đã ức chế quá trình tái tổ hợp lỗ trống và electron tự do, (ii) ZrO2 có năng lượng vùng cấm cao, khi tạo thành hệ ghép với TiO2 tại vùng ranh giới sẽ có năng lượng vùng cấm nhỏ (hình 10) trong trường hợp này các điện tử tự do của cả ZrO2 và TiO2 đều bị giới hạn trong vùng năng lượng của TiO2. Mặt khác quá trình tổng hợp đã tạo ra liên kết Ti-O-Zr cũng làm tăng hoạt tính xúc tác[3,4].Hình 10: Giản đồ mức năng lượng của quá trình chuyển electron giữa TiO2 và ZrO2 trong vật liệu ghép TiO 2 -ZrO 2 Kết luận Từ ZrOCl2.8H2O và TiCl4 trong dung môi propanol, bằng phương pháp đồng kết tủa đã tổng hợp được vật liệu nano composit TiO2-ZrO2 với các tỉ lệ mol tương ứng về thành phần TiO2-ZrO2: 90-10, 80-20, 70-30, 60-40, 50-50. Vật liệu thu được có 3 pha anasta, Trạng thái bẫy bề mặt monoclinic, tetragonal, hạt dạng hình cầu, kích thước 1621 nm.…”

unclassified

See 1 more Smart Citation

Synthesis nanocompsite TiO2-ZrO2 for photocatalic degration of phenol and methylene blue (MB)

Hai¹,

Hong²,

Minh³

2020

Vietnam j. catal. adsorp.

View full text Add to dashboard Cite

A series of TiO2-ZrO2 binary oxide samples with various TiO2-ZrO2 content (90-10, 80-20, 70-30, 60-40, 50-50 mol %) were prepared by the co-precipitation method. The obtained samples were characterized by XRD, SEM, EDX, UV-vis, IR spectroscopy and BET. XRD data identified the anatase phase of the TiO2 and tetragonal, monoclinic phases of ZrO2 in all obtained samples. The average crystallite size of the samples was between 16 to 21 nm. As UV-Vis spectra, the band gaps of TiO2-ZrO2 composites vary from 2,5 eV to 3,1 eV. The photocatalytic reactions confirmed that the nanocomposite sample showed higher photocatalytic activity than the pure oxides samples for the degradation of phenol and methylene blue (MB) under 100 W incandescent lamp. Among the prepared samples, the best sample for photocatalytic degration of MB is the ĐKT9-1 which contains 90% TiO2 and 10% ZrO2 with a percentage 95% after 180 minutes. The ĐKT8-2 which contains 80% TiO2 and 20% ZrO2 shows the best phenol removal efficiency of 97% after 30 minutes. This indicates that the materials are capable of treating MB and phenol in wastewater.

show abstract

Synthesis of TiO2 and ZrO2/TiO2 Composite Microspheres and Their Photo‐Catalytic Degradation of Methylene Blue

Cited by 14 publications

References 25 publications

Structural and photocatalytic properties of co-doped hybrid ZrO2–TiO2 photocatalysts

Structural and photocatalytic properties of co-doped hybrid ZrO2–TiO2 photocatalysts

Photocatalytic Degradation of Rhodamine B and Methylene Orange Using TiO2-ZrO2 as Nanocomposite

Synthesis nanocompsite TiO2-ZrO2 for photocatalic degration of phenol and methylene blue (MB)

Contact Info

Product

Resources

About