Mechanochemical synthesis of zincite doped with cadmium in various amounts

AbstractThis work investigates the limit of Cd doping in ZnO derived by means of mechanochemical synthesis using CdCl2, ZnCl2 and Na2CO3 as precursors and NaCl as diluent. The prepared samples were characterized using X-ray diffraction (XRD), Fourier transformed infrared attenuated total reflectance (FTIR ATR) spectroscopy, UV-Vis diffuse reflectance spectroscopy (DRS),N2 adsorption-desorption isotherms, scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS), while photocatalytic efficiency has been evaluated for methylene blue degradation process. Zn for Cd replacement limits in the crystal lattice of ZnO derived via mechanochemical synthesis were found to be only 2%. For Cd present in a larger portion, CdO and CdCO3 phases appear. Cd doping limits in ZnO were not affected by the milling interval. However, it was observed that Cd doping impairs the nanocrystallinity of ZnO. The morphology and the electronic structure of ZnO and thus photocatalytic activity was inappreciably affected by the Cd doping.

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Synthesis, Characterization, and Photocatalytic Evaluation of Manganese (III) Phthalocyanine Sensitized ZnWO4 (ZnWO4MnPc) for Bisphenol A Degradation under UV Irradiation

Nanomaterials ◽

10.3390/nano10112139 ◽

2020 ◽

Vol 10 (11) ◽

pp. 2139 ◽

Cited By ~ 1

Author(s):

Chukwuka Bethel Anucha ◽

Ilknur Altin ◽

Zekeriya Biyiklioglu ◽

Emin Bacaksiz ◽

Ismail Polat ◽

...

Keyword(s):

Bisphenol A ◽

Uv Irradiation ◽

Photoelectron Spectroscopy ◽

Photocatalytic Performance ◽

Diffuse Reflectance Spectroscopy ◽

Degradation Process ◽

X Ray Diffraction ◽

X Ray ◽

Uv Visible ◽

Adsorption Desorption

ZnWO4MnPc was synthesized via a hydrothermal autoclave method with 1 wt.% manganese (iii) phthalocyanine content. The material was characterized for its structural and morphological features via X-ray diffraction (XRD) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, transmission emission microscopy (TEM), scanning electron microscopy-Energy dispersive X-ray spectroscopy (SEM-EDX), N2 adsorption–desorption at 77K, X-ray photoelectron spectroscopy (XPS), and UV-visible/diffuse reflectance spectroscopy(UV-vis/DRS). ZnWO4MnPc photocatalytic performance was tested on the degradation of bisphenol A (BPA). The ZnWO4MnPc material removed 60% of BPA after 4 h of 365 nm UV irradiation. Degradation process improved significantly to about 80% removal in the presence of added 5 mM H2O2 after 4 h irradiation. Almost 100% removal was achieved after 30 min under 450 nm visible light irradiation in the presence of same concentration of H2O2. The effect of ions and humic acid (HA) towards BPA removal was also investigated.

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Synthesis of porous LaFeO3 prepared by nanocasting method for photo-Fenton degradation of oily-containing wastewater

Vietnam Journal of Catalysis and Adsorption ◽

10.51316/jca.2022.002 ◽

2021 ◽

Vol 11 (1) ◽

pp. xx-xx

Author(s):

Nga Phan To ◽

Lien Nguyen Hong ◽

Tuyen Le Van ◽

Nhan Phan Chi ◽

Huyen Phan Thanh

Keyword(s):

Electron Microscopy ◽

Catalytic Activity ◽

Visible Light ◽

Diffuse Reflectance Spectroscopy ◽

X Ray Diffraction ◽

X Ray ◽

Catalytic Activities ◽

Transmission Electron ◽

Visible Light Driven ◽

Adsorption Desorption

Porous LaFeO3 were synthesised by nanocasting method using mesoporous silica (SBA-15) as a hard template and used as a visible-light-driven photocatalyst. The as-synthesised LaFeO3 photocatalyst were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray Diffraction (XRD), N2 adsorption-desorption, and Ultraviolet–Visible Diffuse Reflectance Spectroscopy (UV-vis DRS). The photo-Fenton catalytic activities of porous LaFeO3 were investigated for the degradation of oily-containing wastewater. The results showed that porous LaFeO3 had better photo-Fenton catalytic activity under visilbe light irradiation than pure LaFeO3. The remarkable improvement photo-Fenton catalytic activity of porous LaFeO3 material could be attributed to the synergistic effect of adsorption and visible light photo-Fenton processes thanks to its porous structure.

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Synthesis and Characterization of Tantalum Based Photocatalysts and Application for Methylene Blue Degradation

Materials Science Forum ◽

10.4028/www.scientific.net/msf.855.147 ◽

2016 ◽

Vol 855 ◽

pp. 147-155

Author(s):

Meghshyam K. Patil ◽

Hari C. Bajaj ◽

Rajesh J. Tayade

Keyword(s):

Methylene Blue ◽

Diffuse Reflectance ◽

Mixed Oxides ◽

Diffuse Reflectance Spectroscopy ◽

Reflectance Spectroscopy ◽

X Ray Diffraction ◽

Methylene Blue Degradation ◽

Degradation Study ◽

X Ray

Ta2O5, Ta2O5–SrO and Ta2O5–TiO2 photocatalysts were prepared by hydrothermal method and characterized using X-ray diffraction (XRD), Ultraviolet-visible Diffuse Reflectance spectroscopy (UV-Vis DRS) and Thermogravimetry (TGA). In synthesized series of TiO2-Ta2O5 catalysts, formation of anatase TiO2, hexagonal Ta2O5 and titanium tantalates were observed. For Ta2O5-SrO (Ta:Sr= 1:1) formation of mixed oxide and crystallinity was observed at calcinations temperature at 1100 °C (5hr). These synthesized catalysts were used for degradation study of methylene blue. The result demonstrated that the photocatalytic activity of the mixed oxides [Ta2O5-TiO2(1:1), Ta2O5-TiO2(2:1), Ta2O5-TiO2(1:2), Ta2O5-SrO (Ta:Sr= 1:1)] was higher than that of Ta2O5 alone.

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Surface active holmia/ γ-alumina nanocatalyst: Preparation and characterization

Main Group Chemistry ◽

10.3233/mgc-200962 ◽

2021 ◽

Vol 19 (4) ◽

pp. 283-294

Author(s):

Basma A.A. Balboul ◽

A.K. Nohman ◽

Randa F. Abd El-baki ◽

Moutera S. Elshemery

Keyword(s):

Electron Microscopy ◽

Isopropyl Alcohol ◽

Diffuse Reflectance Spectroscopy ◽

Physicochemical Characteristics ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Surface Active ◽

Optical Applications ◽

Adsorption Desorption

Holmia supported γ-alumina nanocatalyst was prepared by impregnation of γ-alumina with aqueous solution of holmium acetate hydrate Ho(CH3COO)3.3.5 H2O. The physicochemical characteristics of the nanocatalyst calcined at 600°C were established by different techniques, using surface adsorption–desorption of N2 (SBET), thermogravimetric analysis (TGA), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and UV–vis diffuse reflectance spectroscopy (DRS). The recorded optical reflectance of the sample showed that the new self-assembled nanocatalyst is excellent as host material for advanced optical applications. Moreover, the catalyst showed enhanced catalytic activity toward Isopropyl alcohol decomposition.

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Enhanced Degradation of Rhodamine B by Metallic Organic Frameworks Based on NH2-MIL-125(Ti) under Visible Light

Materials ◽

10.3390/ma14247741 ◽

2021 ◽

Vol 14 (24) ◽

pp. 7741

Author(s):

Hong-Tham Nguyen Thi ◽

Kim-Ngan Tran Thi ◽

Ngoc Bich Hoang ◽

Bich Thuy Tran ◽

Trung Sy Do ◽

...

Keyword(s):

Visible Light ◽

Rhodamine B ◽

Diffuse Reflectance ◽

High Efficiency ◽

Diffuse Reflectance Spectroscopy ◽

Active Species ◽

X Ray Diffraction ◽

X Ray ◽

Fundamental Properties ◽

Adsorption Desorption

Samples of the bimetallic-based NH2-MIL-125(Ti) at a ratio of Mn+/Ti4+ is 0.15 (Mn+: Ni2+, Co2+ and Fe3+) were first synthesized using the solvothermal method. Their fundamental properties were analyzed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectra, scanning electron microscopy (SEM), N2 adsorption–desorption measurements, and UV–Vis diffuse reflectance spectroscopy (UV-Vis DRS). The as-acquired materials were used as high-efficiency heterogeneous photocatalysts to remove Rhodamine B (RhB) dye under visible light. The results verified that 82.4% of the RhB (3 × 10−5 M) was degraded within 120 min by 15% Fe/Ti−MOFs. Furthermore, in the purpose of degrading Rhodamine B (RhB), the rate constant for the 15% Fe/Ti-MOFs was found to be 2.6 times as fast as that of NH2-MIL-125(Ti). Moreover, the 15% Fe/Ti-MOFs photocatalysts remained stable after three consecutive cycles. The trapping test demonstrated that the major active species in the degradation of the RhB process were hydroxyl radicals (HO∙) and holes (h+).

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Preparation of Fe3O4/TiO2 magnetic mesoporous composites for photocatalytic degradation of organic pollutants

Water Science & Technology ◽

10.2166/wst.2017.002 ◽

2017 ◽

Vol 75 (7) ◽

pp. 1523-1528 ◽

Cited By ~ 12

Author(s):

Hongfeng Zhang ◽

Xiu He ◽

Weiwei Zhao ◽

Yu Peng ◽

Donglan Sun ◽

...

Keyword(s):

Diffuse Reflectance ◽

Diffuse Reflectance Spectroscopy ◽

Sol Gel ◽

Nitrogen Adsorption ◽

Magnetic Composite ◽

X Ray Diffraction ◽

X Ray ◽

Mesoporous Composites ◽

Uv Lamp ◽

Adsorption Desorption

Fe3O4/TiO2 magnetic mesoporous composites were synthesized through a sol-gel method with tetra-n-butyl titanate as precursor and surfactant P123 as template. The as-prepared Fe3O4/TiO2 composites were characterized by X-ray diffraction, diffuse reflectance spectroscopy, nitrogen adsorption-desorption isotherm and pore size distribution. The as-synthesized products were applied as photocatalysis for the degradation of Acid Black ATT and tannery wastewater under UV lamp irradiation. Fe3O4/TiO2-8 composites containing Fe3O4 of 8 wt% were selected as model catalysts. The optimal catalyst dosage was 3 g/L in this photocalytic system. The magnetic Fe3O4/TiO2 composites possessed good photocatalytic stability and durability. This approach may provide a platform to prepare a magnetic composite to optimize the catalytic ability.

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Dye-Sensitized-Assisted, Enhanced Photocatalytic Activity of TiO2/Bi4V2O11

NANO ◽

10.1142/s1793292018500285 ◽

2018 ◽

Vol 13 (03) ◽

pp. 1850028 ◽

Cited By ~ 4

Author(s):

Mengjun Liang ◽

Zhiyuan Yang ◽

Ying Mei ◽

Haoran Zhou ◽

Shuijin Yang

Keyword(s):

Photocatalytic Activity ◽

Photoelectron Spectroscopy ◽

Diffuse Reflectance Spectroscopy ◽

X Ray Diffraction ◽

X Ray ◽

Dye Sensitized ◽

Transmission Electron ◽

Efficient Charge ◽

Degradation Activity ◽

Adsorption Desorption

In this study, the TiO2/Bi4V2O[Formula: see text] nanocomposite photocatalysts were prepared by loading different amount of TiO2 nanoparticles onto the surface of Bi4V2O[Formula: see text] nanospheres via a facile hydrothermal method. Afterwards, the as-synthesized samples were characterized by high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), N2 adsorption–desorption isotherms, X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS) and photocurrent techniques. The optimal TiO2/Bi4V2O[Formula: see text] composite with 20[Formula: see text]wt.% TiO2 loading (TB2) exhibited the best photocatalytic activity, which could degrade almost RhB completely within 30[Formula: see text]min under visible light irradiation. The enhanced photocatalytic activity of TiO2/Bi4V2O[Formula: see text] composites for RhB degradation could be mainly ascribed to the efficient charge separation over dye-induced sensitized and the increased specific surface area. Also, the photocatalytic activities of TiO2/Bi4V2O[Formula: see text] for CIP degradation were tested. After five consecutive recycling experiments, the photocatalytic degradation activity of TB2 could still reach 99% which indicated that the catalysts had superior stability. Based on the experimental and bandgap calculations, a possible photocatalytic mechanism of TiO2/Bi4V2O[Formula: see text] for RhB degradation was proposed.

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Ultrasonic-hydrothermal Synthesis and Characterization of Mesoporous Anatase TiO2 Microspheres

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.2323 ◽

2011 ◽

Vol 239-242 ◽

pp. 2323-2326 ◽

Cited By ~ 1

Author(s):

Hai Bin Li ◽

Shu Guang Chen ◽

Wei Ming Lu ◽

Qi Cheng Liu

Keyword(s):

Diffuse Reflectance Spectroscopy ◽

Tetrabutyl Titanate ◽

X Ray Diffraction ◽

Structure Directing Agent ◽

X Ray ◽

Transmission Electron ◽

Uv Visible ◽

Average Size ◽

Adsorption Desorption

Mesoporous TiO2 microspheres with a combination of large surface and high crystallinity were fabricated by an ultrasonic-hydrothermal method with Octadecylamine as a structure-directing agent and tetrabutyl titanate as a precursor. The mesoporous materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption–desorption measurements, and UV–visible diffuse reflectance spectroscopy (UV-vis). Low-angle XRD and TEM images indicated that the disordered wormhole-like mesoporous architecture of TiO2 microspheres with diameters of about 200-400 nm were actually formed by agglomerization of nanoparticles with an average size of about 10nm. The analysis from N2 adsorption–desorption isotherms showed that the surface area of mesoporous sample was 204.7 m2g-1, with a pore size of 4.3 nm and pore volume of 0.263 cm3g-1 after calcined at 673 K.

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The impregnation of ZnO onto ZSM-5 derived from red mud for photocatalytic degradation of methylene blue

Sustainable Environment Research ◽

10.1186/s42834-021-00113-8 ◽

2022 ◽

Vol 32 (1) ◽

Author(s):

Hellna Tehubijuluw ◽

Riki Subagyo ◽

Yuly Kusumawati ◽

Didik Prasetyoko

Keyword(s):

Methylene Blue ◽

Photocatalytic Degradation ◽

Red Mud ◽

Diffuse Reflectance Spectroscopy ◽

Degradation Products ◽

Nitrogen Adsorption ◽

Liquid Chromatography Mass Spectrometry ◽

X Ray Diffraction ◽

X Ray ◽

Adsorption Desorption

AbstractPhotocatalytic degradation of Methylene Blue (MB) by zinc oxide/zeolite socony mobile-5 (ZnO/ZSM-5) composites was investigated. The ZSM-5 material was synthesized from red mud by a two-step hydrothermal method to which ZnO loadings at different mass ratios were subsequently performed. Characterizations using X-ray diffraction (XRD), Fourier transform infrared spectroscopy, and scanning electron microscopy were carried out to identify the formation of ZSM-5 and ZnO/ZSM-5. ZSM-5 and ZnO/ZSM-5 have cubic microcrystallite morphologies. ZnO loading in the ZnO/ZSM-5 composites was successfully performed and confirmed by the appearance of wurtzite peaks in the XRD spectra that matched the Joint Committee on Powder Diffraction Standards data. The presence of ZnO in ZSM-5 leading resulted in a decrease in the surface area and pore size as confirming by nitrogen adsorption-desorption isotherm experiments. The band gap of the samples was measured using UV-Vis diffuse reflectance spectroscopy. The optimum photocatalytic degradation of MB was observed at a ZnO loading of 34% w/w dubbed 34-ZnO/ZSM-5. The influence of the initial concentration of MB was also investigated at 80, 90, and 100 mg L− 1 using 34-ZnO/ZSM-5 and ZSM-5. Liquid chromatography–mass spectrometry characterization was performed to analyze the degradation products.

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Investigation of CO2 Adsorption on Triethylenetetramine Modified Adsorbents of TETA(n)/Zr-TSCD

Australian Journal of Chemistry ◽

10.1071/ch19541 ◽

2020 ◽

Vol 73 (11) ◽

pp. 1051

Author(s):

Fan-Ming Yang ◽

Min Liao ◽

Chang-Hua Long ◽

Jian-Bin Fu ◽

Xiao-Yan Zhu

Keyword(s):

Adsorption Capacity ◽

Photoelectron Spectroscopy ◽

Diffuse Reflectance Spectroscopy ◽

Absorption Capacity ◽

X Ray Diffraction ◽

X Ray ◽

Energy Dispersion Spectrum ◽

New Type ◽

Modified Adsorbents ◽

Adsorption Desorption

In the present study, a new type of material of Zr-TSCD was first synthesized and modified with different amounts of triethylenetetramine (TETA). The properties of the adsorbents were characterised with X-ray diffraction, UV-vis diffuse reflectance spectroscopy, FT-IR spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, N2 adsorption–desorption, energy dispersion spectrum, and thermogravimetric analysis. The results suggested that Zr-TSCD (TSCD=Na3C6H5O7·2H2O) was successfully synthesized through the coordination of Zr atoms from ZrOCl2·8H2O and O species in –COO– groups. After functionalization with TETA, the structure of Zr-TSCD was preserved and the adsorption capacity of CO2 was enhanced dramatically. At 75°C, TETA(30)/Zr-TSCD achieved a maximum absorption capacity of 175.1mg g−1 in a stream of 10mL min−1 CO2. The adsorption capacity ratio of CO2/N2, CO2/O2, and CO2/SO2 was 10.5, 7.4, and 1.2, respectively. In addition, the adsorption capacity of CO2 remained stable during 10 adsorption–desorption cycles.

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