scholarly journals Mo-Doped CuO Nanomaterial for Photocatalytic Degradation of Water Pollutants under Visible Light

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1198
Author(s):  
Mudassar Maraj ◽  
Ahmad Raza ◽  
Xinjie Wang ◽  
Jie Chen ◽  
Khalid Nadeem Riaz ◽  
...  
Keyword(s):  
Waste Water ◽  
Methylene Blue ◽  
Visible Light ◽  
Water Remediation ◽  
Photocatalytic Efficiency ◽  
Monoclinic Structure ◽  
Xrd Diffraction ◽  
Degradation Activity ◽  
Water Pollutant ◽  
Photocatalytic Applications

Recently, metal oxide-based nano-photocatalysts have gained much attention in waste water remediation due to their outstanding properties. In this report, a novel Mo-doped CuO nanomaterial was successfully prepared and utilized for the degradation of methylene blue water pollutant. The molybdenum content was varied from 1–5 wt.% to obtain the desired modified CuO based nanomaterials. The crystalline structures of as prepared materials were investigated by XRD diffraction technique, which explored the successful fabrication of monoclinic structure based CuO nanomaterials. For morphological study, SEM and HRTEM techniques were probed, which had also proved the successful preparation of nanoparticles-based material. SAED is used to check the crystallinity of the sample. The EDX and XPS analysis were performed to evaluate the elemental composition of Mo-doped CuO nanomaterials. The optical characteristics were explored via UV-vis and PL techniques. These studies have showed that the energy bandgap of CuO was decreased from 1.55 eV to 1.25 eV due to Mo doping. The photocatalytic efficiency of Mo-doped CuO nanomaterials was evaluated by degrading methylene blue (MB) under visible light-irradiation. Among different Mo-doped CuO based nanomaterials, the 4 wt.% Mo-doped CuO sample have shown highest degradation activity against MB dye. These results verified that the optimized material can be used for photocatalytic applications, especially for the purification of waste water.

Fabrication of flower-like TiO2 on Bucky paper with enhanced photocatalytic activity

2019 ◽  
Vol 33 (05) ◽  
pp. 1950017 ◽  
Author(s):  
Dongmei Zhang ◽  
Lujun Pan ◽  
Chengwei Li ◽  
Lichen Xia ◽  
Yunping Hu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Surface Defects ◽  
Photocatalytic Property ◽  
Vital Role ◽  
Light Irradiation ◽  
Photocatalytic Efficiency ◽  
Promising Candidate ◽  
Ultraviolet Light Irradiation ◽  
Photocatalytic Applications

The difficulty of recycling and low photocatalytic efficiency in the visible light significantly limit the use of nano-TiO2 in water pollution control. In this work, Bucky papers (BPs), which play a vital role for adsorption of pollutants and transfer of electrons, are introduced as substrates to fabricate and anchor TiO2 nanorods by a facile hydrothermal method. The photocatalytic properties of the TiO2 and BP composites (TiO2@BP) are studied by photodegrading methylene blue in water solutions. It is found that TiO2@BP possesses four times photocatalytic efficiency for methylene blue of TiO2@Si under ultraviolet light irradiation and 10 times under visible light irradiation. This is considered to be attributed to the synergic effect of TiO2@BP system and surface defects of TiO2 nanorods. The TiO2@BP also shows a stable photocatalytic property even after five cyclic photocatalytic degradation. This study indicates that TiO2@BP is a promising candidate for photocatalytic applications, which provides a reference for further research on synthesis of reusable photocatalysts with higher efficiency.

The Photocatalytic Properties of Fe3+ and N Co-Doped TiO2 Micro/Nanofiber Film for Dye Waste Water Decomposition

2011 ◽  
Vol 356-360 ◽  
pp. 853-856 ◽  
Author(s):  
Qiao Zhen Yu ◽  
Xiang Jun Jin ◽  
Shao Yang Li ◽  
Lei Wang ◽  
Kun Long Liang
Keyword(s):  
Waste Water ◽  
Visible Light ◽  
Light Absorption ◽  
Oxygen Demand ◽  
Photocatalytic Efficiency ◽  
Energy Dispersion Spectroscopy ◽  
Visible Light Absorption ◽  
X Ray ◽  
Nano Fiber ◽  
Co Doped

To obtain a TiO2photocatalyst with high photocatalytic efficiency under visible irradiation and good reusability, the Fe3+and N co-doped TiO2micro/nano fiber films were fabricated by electrospinning and calcinations. The morphologies and structures of the resulting samples were analyzed by scanning electron microscopy (SEM), x-ray diffraction and x-ray energy dispersion spectroscopy (EDS). The absorbance and chemical oxygen demand (COD) were characterized respectively by UV–visible spectrophotometer and COD Rapid Tester. The results show that the Fe3+and N co-doped TiO2micro/nano fiber had a multi-porous structure with an average diameter of about 45 to 506 nm. The crystalinity degrees, visible light absorption of these films were affected by the dosage of Fe3+and N co-doping (DFN). Moreover, these films exhibited high photocatalytic activity for the degradation of dye waste water under sunlight and it was related to DFN. As DFN was 0.5 %, it has highest crystalinity degree, largest visible light absorption and highest photocatalytic efficiency on dye waste water. The decolor rate of the dye waste water was as high as 67.6 % and its COD decreased from 2800±200 to 236.40 ± 15.61, when the photocatalytic time was only 3 h.

scholarly journals Enhanced Photodecomposition of Methylene Blue in Water with Sr1−xKxTiO3−δ@PC-polyHIPEs under UV and Visible Light

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Yonghua Gao ◽  
Tao Zhang ◽  
Qipeng Guo ◽  
Lizhen Gao
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
Water Solution ◽  
Internal Phase ◽  
Water Pollutant ◽  
First Time

Photocatalytic method was investigated to remove water pollutant methylene blue (MB) produced in textile, plastic, and dye industries. PC-polyHIPEs were prepared by light-induced polymerization of dopamine in transparent polyHIPEs which were synthesized by polymerization within high internal phase emulsions. Sr1-xKxTiO3-δ (x = 0–0.5) nanoparticles were incorporated and adhered to PC-polyHIPEs to form Sr1-xKxTiO3-δ@PC-polyHIPEs for the first time. The catalysts were characterized by XRD, FTIR, TGA, UV-Vis DRS, and SEM and their photocatalytic properties for MB decomposition were measured over UV-Vis spectrometer. The PC-polyHIPEs were of interconnected porous structure with around 100 μm pores and 30 μm windows. Sr1−xKxTiO3−δ@PC-polyHIPEs showed excellent MB decomposition activity under either UV or visible light although Sr1−xKxTiO3−δ alone worked only under UV light. When x = 0.3, Sr1−xKxTiO3−δ@PC-polyHIPEs showed the highest photocatalytic performance due to the existence of more oxygen vacancies. When the water solution with 50 mg L−1 MB and 1.6 gcat. L−1 Sr0.7K0.3TiO3−δ@PC-polyHIPEs was exposed to visible light for 160 min at room temperature, 88.3% of MB was decomposed. After being used for eight cycles, 87.6% activity of fresh Sr0.7K0.3TiO3−δ@PC-polyHIPEs still remained. The influences of salinity, temperature, and catalyst concentration on the catalytic activity were studied. For MB decomposition under visible light, the activation energy of Sr0.7K0.3TiO3−δ@PC-polyHIPEs was calculated to be 12.3 kJ mol−1 and the kinetics analysis revealed that the photocatalysis followed the second-order reaction. These findings demonstrated that Sr1−xKxTiO3−δ@PC-polyHIPEs were an effective candidate for real application in decomposition of MB in water.

scholarly journals Facile One-Step Hydrothermal Fabrication of (Sr0.6Bi0.305)2Bi2O7/SnO2 Heterojunction with Excellent Photocatalytic Activity

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 321 ◽  
Author(s):  
Di Zhu ◽  
Xinling Wang ◽  
Huiting An ◽  
Yan Zhong ◽  
Dianhui Wang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Dominant Role ◽  
Light Response ◽  
Photocatalytic Efficiency ◽  
Response Range ◽  
Structure Morphology ◽  
Excellent Photocatalytic Activity ◽  
Pyrochlore Type ◽  
One Step

The pyrochlore-type (Sr0.6Bi0.305)2Bi2O7 (SBO), containing Bi3+ and Bi5+ mixed valent states, was recently found to be used as a new visible light responsive photocatalyst. Novel SBO/SnO2 heterostructured composites were synthesized through a facile one-step hydrothermal method. The phase structure, morphology, chemical composition, and optical properties of the obtained samples were characterized by XRD, SEM, TEM, XPS, and UV-vis DRS. Compared to pure SBO and SnO2, the synthesized SBO/SnO2 composites exhibited significantly enhanced photocatalytic efficiency. The results indicated that the photoinduced holes and superoxide radicals play a dominant role and are the main reactive species during the degradation of Methylene Blue (MB) solution under visible light irradiation. Heterojunctions, formed in samples, directly contribute to the improvement of photocatalytic efficiency of SBO/SnO2 composites, since it not only broadens the light response range, but also accelerates the separation of photogenerated carriers.

Construction of Visible Light Responsive CdSe/g-C3N4 Nanocomposites for H2 Production

2019 ◽  
Vol 11 (9) ◽  
pp. 1281-1291
Author(s):  
Mohammad W. Kadi ◽  
Reda M. Mohamed ◽  
Adel. A. Ismail ◽  
Detlef W. Bahnemann
Keyword(s):  
Visible Light ◽  
Large Scale ◽  
Synthesis Method ◽  
Clean Energy ◽  
H2 Production ◽  
Photocatalytic Efficiency ◽  
Aqueous Synthesis ◽  
Xrd Diffraction ◽  
Orderly Fashion ◽  
Hexagonal Arrangement

Utilization of heterogeneous photocatalysts for H2 production using water splitting reaction under visible light is a promising approach for production of large scale sustainable, renewable, and clean energy. CdSe/g-C3N4 nanocomposites were synthesized in this study by employing a simple aqueous synthesis method. Various CdSe contents were tested as a photocatalyst in the H2 production. XRD diffraction results confirmed the hexagonal arrangement of CdSe and its incorporation onto g-C3N4. Spherical shaped CdSe nanoparticles were distributed on the g-C3N4 nanosheets in an orderly fashion. The photocatalytic efficiency of CdSe/g-C3N4 composites was assessed utilizing glycerol as a scavenger. The photocatalytic activity for H2 production was enhanced by increasing the CdSe content, reaching H2 yield of up to 26000 μmol·g-1 using 5% CdSe/g-C3N4 nanocomposite. The produced H2 was higher ∼86 and 52 times than g-C3N4 and CdSe. The H2 production yield also increased with increased 5% CdSe/g-C3N4 photocatalyst load.

scholarly journals Superparamagnetic and photocatalytic activity of CoCe0.02Dy0.02Fe1.96O4 nanoparticles synthesized by citrate-gel autocombustion technique

2019 ◽  
Vol 9 (4) ◽  
pp. 4164-4167 ◽  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Charge Separation ◽  
Analytical Techniques ◽  
Photocatalytic Efficiency ◽  
Semiconducting Materials ◽  
Light Utilization ◽  
Spin Glass Behaviour ◽  
Degussa P25

Mitigating organic pollutants by employing semiconducting materials is considered to be green and sustainable route to tackle the environmental problems. Herein, citrate-gel autocombustion method was adopted to synthesize Ce and Dy doped CoFe2O4 and characterized by various analytical techniques. The efficacy of prepared CoCexDyxFe2-2xO4 (x=0-0.04) samples were tested for degradation of Methylene blue (MB) under visible light irradiation. The photocatalytic efficiency of CoCe0.02Dy0.02Fe1.96O4 for degradation of MB was found to be larger than pure CoFe2O4, Degussa P25 and other modified CoFe2O4. The enhanced photocatalytic activity was attributed to improved charge separation and visible light utilization by Ce and Dy into CoFe2O4 system. The super-spin glass behaviour of CoCexDyxFe2-2xO4 confirmed from flat nature of magnetization of FC curve below TB.

Characteristics of doped TiO2 photocatalysts for the degradation of methylene blue waste water under visible light

2010 ◽  
Vol 501 (1) ◽  
pp. 54-59 ◽  
Author(s):  
Zhongqing Liu ◽  
Yicao Wang ◽  
Wei Chu ◽  
Zhenhua Li ◽  
Changchun Ge
Keyword(s):  
Waste Water ◽  
Methylene Blue ◽  
Visible Light ◽  
Tio2 Photocatalysts ◽  
Doped Tio2

Synthesis of Bi2MoO6/BiOI Composites for Visible Light Driven Photocatalytic Degradation of Methylene Blue

2021 ◽  
Vol 13 (4) ◽  
pp. 545-549
Author(s):  
You Zhang ◽  
Ning Xie ◽  
Lu Zhang ◽  
Fenghuang Wu ◽  
Zifei Xie ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
Solvothermal Method ◽  
Photocatalytic Efficiency ◽  
Photogenerated Electrons ◽  
Visible Light Driven ◽  
Photocatalytic Performances

Bi2MoO6/BiOI composites were synthesized by solvothermal method and photocatalytic performances were evaluated by degrading methylene blue (MB). Experiment results show that Bi2MoO6/0.5BiOI has the best photocatalytic efficiency for eliminating 92% MB in 2 h under the excitation of visible light. Such superior photocatalytic performance is due to the significantly enhanced ability to absorb visible light and separated efficiency of photogenerated electrons and holes.

scholarly journals Synthesis of Cu2O and Cu2O-C3N4 nanomaterials for the photodegradation of organic dyes under visible light irradiation

2021 ◽  
Vol 10 (3) ◽  
pp. xx-xx
Author(s):  
Lan Nguyen Thi ◽  
Mai Nguyen Thi Tuyet ◽  
Hue Dang Thi Minh ◽  
Huyen Tran Thi Thu ◽  
Nga Nguyen Kim ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Absorption Spectra ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Photocatalytic Efficiency ◽  
Visible Light Region ◽  
Light Region

These experiment fabricated C3N4 powdermaterials by the calcinational method and fabricated Cu2O, Cu2O-3%C3N4, Cu2O-5%C3N4 nanomaterials by the hydrothermal method. The powdermaterials characteristics were studied by methods such as: X-ray diffraction (XRD); raman shift; scanning electron microscope (SEM); UV-vis solid absorption spectra. The photocatalytic activity of samples was studied by decomposition of methylene blue dye under visible light radiation. The results showed that the fabricated C3N4 sample was single phase with high porosity cotton structure. The Cu2O, Cu2O-3%C3N4 andCu2O-5%C3N4 samples had octahedral crystal structure with the crystal particle size was about 200-300 nm. The C3N4 doped Cu2O samples had octahedral crystal particles arranged more closely than that of Cu2O and filled in gaps by cotton, porous clusters of C3N4. The materials all had the absorption spectra expanded in the visible light region (l» 450-900 nm). The C3N4 doped Cu2O samples achieved the better photocatalytic efficiency than Cu2O and C3N4 samples in visible light region. The highest photocatalytic efficiency achieved 100% was of the Cu2O-3%C3N4 sample in the photodegradation of methylene blue dye after 30 minutes under visible light irradiation.

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