Synthesis and Characterization of Copper Oxide Composite and Study of Composite Mediated Photo-Oxidative Degradation of Methylene Blue under Visible Light

International Letters of Chemistry Physics and Astronomy ◽

10.18052/www.scipress.com/ilcpa.63.29 ◽

2016 ◽

Vol 63 ◽

pp. 29-35

Author(s):

Md Ataur Rahman ◽

Tajmeri S.A. Islam

Keyword(s):

Methylene Blue ◽

Visible Light ◽

Copper Oxide ◽

Oxidative Degradation ◽

Band Gap Energy ◽

Reflectance Measurement ◽

Oxide Composite ◽

Cyclic Mechanism ◽

Ph Range

Copper oxide composite was prepared from copper (II) acetate. Characterization of composite was performed by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), FT-IR Spectroscopy and X-ray diffractometry. According to the findings of SEM the particle size was within the range from 450 nm to 550 nm. Band gap energy was determined by reflectance measurement and value was found to be 4.21 eV. From the result of EDS, it appears that the composite contains only Cu and O atoms. Result of XRD confirms that the composite contains CuO, Cu2O and metallic Cu. FTIR spectrum of composite supports the presence of Cu2O. Adsorptive and catalytic properties of composite were studied using Methylene blue as adsorbent. Photo-oxidative degradation of MB was investigated in the suspension of composite in separate experiments at different pH ranging from 2.5 to 5.5 under visible light. Low pH range from 2.5 to 3.5 is most effective for degradation. This was explained by proposing a cyclic mechanism which suggests the conversion of Cu22+ to Cu2+ and vice versa. 95.5% of MB was found to degrade when 5×10-5 M solution of MB was irradiated for three hours in 100 mL suspension of composite having concentration 1gL-1 at pH 2.5.

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Visible-Light-Driven Bio-Templated Magnetic Copper Oxide Composite for Heterogeneous Photo-Fenton Degradation of Tetracycline

Water ◽

10.3390/w13141918 ◽

2021 ◽

Vol 13 (14) ◽

pp. 1918

Author(s):

Olushola Adewole Alani ◽

Hadiza Abdullahi Ari ◽

Susanna Olushola Alani ◽

Nnanake-Abasi O. Offiong ◽

Wei Feng

Keyword(s):

Visible Light ◽

Copper Oxide ◽

Photoelectron Spectroscopy ◽

High Efficiency ◽

Electrical Impedance Spectroscopy ◽

Oxide Composite ◽

Wide Ph Range ◽

Visible Light Driven ◽

Prepared Composite ◽

Ph Range

The development of a visible-light-driven, reusable, and long-lasting catalyst for the heterogeneous photo-Fenton process is critical for practical application in the treatment of contaminated water. This study focuses on synthesizing a visible-light-driven heterogenous bio-templated magnetic copper oxide composite (Fe3O4/CuO/C) by a two-step process of bio-templating and hydrothermal processes. The prepared composite was characterized by field emission-scanning electron microscope (FE-SEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), electrical impedance spectroscopy (EIS), and vibrating sample magnetometer (VSM). The results reveal that the prepared composite retains the template’s (corn stalk’s) original porous morphology, and a substantial amount of CuO and Fe3O4 particles are loaded onto the surface of the template. The prepared Fe3O4/CuO/C composite was employed as a catalyst for heterogeneous photo-Fenton degradation of tetracycline (TC) irradiated by visible light. The prepared Fe3O4/CuO/C catalyst has high efficiency towards TC degradation within 60 min across a wide pH range irradiated by visible light, which is attributed to its readily available interfacial boundaries, which significantly improves the movement of photoexcited electrons across various components of the prepared composite. The influence of other parameters such as initial H2O2 concentration, initial concentration of TC, and catalyst dosages was also studied. In addition to high efficiency, the prepared catalyst’s performance was sustained after five cycles, and its recovery is aided by the use of an external magnetic field. This research paper highlights the development of a heterogeneous catalyst for the elimination of refractory organic compounds in wastewater.

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Synthesis and Characterization of Ag@C-TiO2 Nanocomposite for Degradation of Sasirangan Textile Wastewater

Jurnal Kimia Sains dan Aplikasi ◽

10.14710/jksa.22.6.299-304 ◽

2019 ◽

Vol 22 (6) ◽

pp. 299-304

Author(s):

Heny Puspita Dewi ◽

Joko Santoso ◽

Nur Firda Trianda ◽

Rodiansono Rodiansono

Keyword(s):

Methylene Blue ◽

Photocatalytic Activity ◽

Photocatalytic Degradation ◽

Textile Wastewater ◽

Band Gap Energy ◽

Tio2 Photocatalyst ◽

Composite Photocatalysts ◽

Xrd Patterns ◽

Brookite Phase

Carbon-titanium oxide nanocomposite (denoted as @C-TiO2) was successfully synthesized via hydrothermal method at 150°C for 24 h. The C-TiO2 nanocomposite was furtherly modified by adding an Ag metal dopant (denoted as Ag@C-TiO2) to improve and applied to the photocatalytic degradation of Sasirangan textile wastewater. The composite photocatalysts were characterized by XRD and UV–Vis DRS spectroscopies. XRD patterns showed that TiO2 in @C-TiO2 mainly consisted of a brookite phase, as indicated by a series sharp diffraction peak at 2θ = 27.2° (111), 31.5° (121) and 55.9° (241). The calculated band gap energy (Eg) derived from UV-Vis DRS spectra for TiO2, @C-TiO2, and Ag@C-TiO2 were 2.95 eV, 2.54 eV, and 2.74 eV, respectively. Ag@C-TiO2 photocatalyst was found to be active for the photocatalytic degradation of Sasirangan textile wastewater, as indicated by the change of wastewater color from dark to clear. The quantitative photocatalytic activity of Ag@C-TiO2 was evaluated in the degradation of methylene blue, whereas the conversion of methylene blue was 41.3%. The addition of Ag to @C-TiO2 is believed to play an essential role in the enhancement of photocatalytic activity.

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Ultrasound assisted preparation and characterization of Ag supported on ZnO nanoparticles for visible light degradation of methylene blue dye

Journal of Molecular Liquids ◽

10.1016/j.molliq.2019.111313 ◽

2019 ◽

Vol 291 ◽

pp. 111313 ◽

Cited By ~ 8

Author(s):

N.S. Satdeve ◽

R.P. Ugwekar ◽

B.A. Bhanvase

Keyword(s):

Methylene Blue ◽

Visible Light ◽

Zno Nanoparticles ◽

Blue Dye ◽

Methylene Blue Dye ◽

Ultrasound Assisted ◽

Visible Light Degradation

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Synthesis and Photoactivity of Fe3O4/TiO2-Co as a Magnetically Separable Visible Light Responsive Photocatalyst

Indonesian Journal of Chemistry ◽

10.22146/ijc.26831 ◽

2018 ◽

Vol 18 (3) ◽

pp. 403 ◽

Cited By ~ 2

Author(s):

Eko Sri Kunarti ◽

Indriana Kartini ◽

Akhmad Syoufian ◽

Karolina Martha Widyandari

Keyword(s):

Methylene Blue ◽

Visible Light ◽

Dopant Concentration ◽

Band Gap Energy ◽

Methylene Blue Solution ◽

Magnetic Photocatalyst ◽

Blue Solution ◽

Degradation Reaction ◽

Visible Irradiation ◽

Uv Visible

Synthesis of magnetic photocatalyst, Fe3O4/TiO2-Co, with characterization and photoactivity examination have been conducted. The synthesis was initiated by preparation of Fe3O4 particles using coprecipitation method. The Fe3O4 particles were then coated with TiO2-Co at a various ratio of Fe3O4:TiO2 and concentration of Co(II) dopant. The Fe3O4/TiO2-Co was characterized by FTIR, XRD, TEM, SEM-EDX, VSM, and SR UV-visible methods. Photoactivity of the Fe3O4/TiO2-Co was carried out using methylene blue as a target molecule in degradation reaction within a batch system. By using optimum conditions, the degradation of methylene blue solution was performed under exposure to UV, visible light and dark condition. Results showed that the Fe3O4/TiO2-Co formation was confirmed by the presence of Fe3O4 and anatase diffraction peaks in the X-ray diffractogram. SR UV-Vis spectra indicated that the Fe3O4/TiO2-Co was responsive to visible light. Band gap energy of the Fe3O4/TiO2-Co with dopant concentration of 1; 5; 10 and 15% were 3.22; 3.12; 3.09 and 2.81 eV, respectively. The methylene blue solution can be well photodegraded at a pH of 10 for 210 min. The Fe3O4/TiO2-Co has the highest ability to methylene blue photodegradation with dopant concentration of 10% gave degradation yield of 80.51 and 95.38% under UV and visible irradiation, respectively.

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Synthesis, crystallographic characterization of a novel iron porphyrinate and its application as a photocatalyst for degradation of methylene blue under visible light irradiation

Inorganic Chemistry Communications ◽

10.1016/j.inoche.2018.01.027 ◽

2018 ◽

Vol 90 ◽

pp. 26-28 ◽

Cited By ~ 6

Author(s):

Taotao Liu ◽

Tingting Hu ◽

Chuanjiang Hu ◽

Jian-Ping Lang

Keyword(s):

Methylene Blue ◽

Visible Light ◽

Visible Light Irradiation ◽

Light Irradiation

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Increasing Rutile Phase Amount in Chromium-Doped Titania by Simple Stirring Approach for Photodegradation of Methylene Blue under Visible Light

Australian Journal of Chemistry ◽

10.1071/ch14565 ◽

2015 ◽

Vol 68 (7) ◽

pp. 1129 ◽

Cited By ~ 6

Author(s):

Pei Wen Koh ◽

Leny Yuliati ◽

Hendrik O. Lintang ◽

Siew Ling Lee

Keyword(s):

Methylene Blue ◽

Visible Light ◽

Band Gap ◽

Rutile Phase ◽

Band Gap Energy ◽

Synthesis Process ◽

Doped Tio2 ◽

Gap Energy ◽

Stirring Time ◽

Doped Titania

The amount of rutile phase in chromium-doped titania photocatalyst was controlled by varying stirring time (0.5–2.0 h) at room temperature during a sol–gel synthesis process. The percentage of rutile phase increased from 15.1 % to 28.6 % when stirring time was prolonged from 0.5 to 1.5 h. Further increases in the stirring time had negligible effect on the rutile phase amount. As evidenced by analyses using diffuse reflectance ultraviolet–visible spectroscopy and X-ray photoelectron spectroscopy, a sufficient stirring time was important for more substitution of Cr3+ for Ti4+ in the lattice, resulting in anatase-to-rutile phase transformation. The formation of more rutile phase in Cr-doped TiO2 not only reduced the band gap energy, but also induced surface defects that retarded electron–hole recombination. It has been demonstrated that the Cr-doped TiO2 prepared with a stirring time of 1.5 h possessed the lowest band gap energy of 1.89 eV, and hence it achieved the highest photodegradation of methylene blue under visible light irradiation.

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Preparation and Characterization of Ag/TiO2-xNx Nanoparticles

Materials Science Forum ◽

10.4028/www.scientific.net/msf.534-536.105 ◽

2007 ◽

Vol 534-536 ◽

pp. 105-108

Author(s):

Zhong Qing Liu ◽

Zheng Hua Li ◽

Yan Ping Zhou ◽

Chang Chun Ge

Keyword(s):

Methylene Blue ◽

Photocatalytic Activity ◽

Visible Light ◽

Ultraviolet Light ◽

Hole Pair ◽

Electron Hole ◽

Photoexcited Electron ◽

Photochemical Deposition ◽

Electron Hole Pair

The Ag/TiO2-xNx nanoparticles were synthesized by photochemical deposition with irradiation of visible light in a TiO2-XNX suspension system. The prepared products were characterized by means of XRD, Uv-vis, and FEM. Its photocatalytic activity was investigated by the decomposition of methylene blue (MB) solution under illumination of visible and ultraviolet light, respectively. Compared to TiO2-xNx, the photocatalytic activity of as–prepared Ag/TiO2-xNx is obviously enhanced due to the decreasing recombination of a photoexcited electron-hole pair. The mechanism in which photocatalytic activity is enhanced is discussed in detail.

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