Fabrication of mesoporous titanium dioxide using azadirachta indica leaves extract towards visible-light-driven photocatalytic dye degradation

Dash, Lopamudra; Biswas, Rathindranath; Ghosh, Rakesh Kumar; Kaur, Vishaldeep; Banerjee, Biplab; Sen, Tuhinadri; Patil, Ranjit A.; Ma, Yuan‐Ron; Haldar, Krishna Kanta

doi:10.1016/j.jphotochem.2020.112682

Cited by 20 publications

(18 citation statements)

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“…The ATR-FTIR spectrum of g-C 3 N 4 [Figure a(i)] shows the peaks at 808 and 887 cm –1 , which are due to the breathing modes of the triazine ring and the deformation mode of N–H bonds, respectively . The peaks at 1236.47, 1316, 1359.76, 1410, and 1467 cm –1 were assigned to the aromatic sp 3 C–N bonds while the peak at 1647.7 cm –1 corresponds to the sp 2 CN stretching vibration modes. − However, the spectrum [Figure a(ii)] of Co 3 O 4 /MoO 3 /g-C 3 N 4 shows a strong peak at 995.03 cm –1 , which is attributed to the terminal Mo–O stretching vibration of the orthorhombic MoO 3 phase. The ATR-FTIR spectrum also shows a broad and sharp peak in the region 1000–900 cm –1 attributed to the stretching vibration of molybdenyl bond ν s (MO).…”

Section: Resultsmentioning

confidence: 99%

Graphitic Carbon Nitride Composites with MoO₃-Decorated Co₃O₄ Nanorods as Catalysts for Oxygen and Hydrogen Evolution

Ahmed

Biswas

Patil

et al. 2021

ACS Appl. Nano Mater.

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We have prepared a graphitic carbon nitride (g-C 3 N 4 ) composite with MoO 3decorated Co 3 O 4 nanorods (Co 3 O 4 /MoO 3 /g-C 3 N 4 ) via the hydrothermal approach, and this hybrid material acts as a highly active and durable electrocatalyst for water splitting reactions. This material could fundamentally influence the catalytic processes and performance of oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The OER and HER activities of Co 3 O 4 -/MoO 3 -based nanorods are enhanced by blending with conducting support, for example, graphitic carbon nitrides (g-C 3 N 4 ). The X-ray diffraction pattern and the attenuated total reflectance-Fourier transform infrared data revealed that the as-synthesized nanorods are highly crystalline in nature and are attached to the g-C 3 N 4 support. Transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy studies also affirm the successful heterointerface formation between Co 3 O 4 /MoO 3 nanorods and g-C 3 N 4 . This Co 3 O 4 /MoO 3 /g-C 3 N 4 rodshaped catalyst is highly stable in comparison to its individual constituent and generates a current density of 10 mA cm −2 at a low overpotential of 206 mV for OER and 125 mV for HER in alkaline and acidic media, respectively. This work could pave the way for developing Co 3 O 4 /MoO 3 /g-C 3 N 4 composite materials as electrocatalysts for overall water splitting reactions. KEYWORDS: Co 3 O 4 /MoO 3 /g-C 3 N 4 , decorated, nanorods, composite, water splitting, OER, HER

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Section: Resultsmentioning

confidence: 99%

Graphitic Carbon Nitride Composites with MoO₃-Decorated Co₃O₄ Nanorods as Catalysts for Oxygen and Hydrogen Evolution

Ahmed

Biswas

Patil

et al. 2021

ACS Appl. Nano Mater.

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“…Undoubtedly, there are high hopes for the application of nanomaterials not only as photocatalysts in heterogeneous photodegradation but in other scientific fields too. However, the conventional techniques have their limitations, such as expensive equipment, toxic and non-biodegradable precursors, the need for expertise, low yield of product, as well as long reaction times [29,30].…”

Section: Green Synthesis Of Tio 2 and Zno Nanoparticles Based On Vari...mentioning

confidence: 99%

“…The characteristics and efficiency of the green synthesized photoactive nanoparticles are presented in the Table 3. One example for the green approaches in the synthesis of TiO 2 nanoparticles is explained in the study by authors Dash et al [29]. In their work the leaf extract of Azadirachta indica was applied.…”

Section: Green Synthesis Of Tio 2 and Zno Nanoparticles Based On Vari...mentioning

confidence: 99%

“…BET findings showed the surface of MTO-20, MTO-16, MTO-12 and MTO-8 which was found to be 157.35, 91.87, 39.12 and 8.55 m 2 /g. In addition, the pore volumes were also determined (i.e., they were found to be 0.31, 0.26, 0.17 and 0.14 cm 3 /g for MTO-20, MTO-16, MTO-12 and MTO-8, respectively) [29]. The photocatalytic activity of the newly synthesized NPs was also investigated in the removal of Rhodamine 6 G (R6 G) dye under UV irradiation.…”

Section: Green Synthesis Of Tio 2 and Zno Nanoparticles Based On Vari...mentioning

confidence: 99%

“…According to the results it can be seen that 98% of R6 G was degraded by MTO-20 after 57 min of UV irradiation, while in the systems with MTO-16, MTO-12 and MTO-8 the degradation efficiencies were 64%, 27% and 15%, respectively. To sum up, the MTO-20 NPs are promising in the actual water remediation processes; however, these NPs could be more improved since they are efficient in the UV region but not under natural sunlight [29].…”

Section: Green Synthesis Of Tio 2 and Zno Nanoparticles Based On Vari...mentioning

confidence: 99%

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Sustainable Green Nanotechnologies for Innovative Purifications of Water: Synthesis of the Nanoparticles from Renewable Sources

2022

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Polluting the natural water resources is a serious global issue, which is confirmed by the fact that today at least 2 billion people consume water from contaminated sources. The conventional wastewater treatment methods cannot effectively remove the persistent pollutants (e.g., drugs, organic dyes, pesticides) from the aqueous environment. Heterogeneous photocatalysis is a promising and sustainable alternative for water remediation. It is based on the interaction between light irradiation and the semiconductors (e.g., TiO2, ZnO) as photocatalysts, but these compounds, unfortunately, have some disadvantages. Hence, great attention has been paid to the nanotechnology as a possible way of improvement. Nanomaterials have extraordinary properties; however, their conventional synthesis is often difficult and requires a significant amount of dangerous chemicals. This concise topical review gives recent updates and trends in development of sustainable and green pathways in the synthesis of nanomaterials, as well as in their application for water remediation. In our review we put emphasis on the eco-friendly, mostly plant extract-based materials. The importance of this topic, including this study as well, is proved by the growing number of publications since 2018. Due to the current serious environmental issues (e.g., global warming, shortage of pure and quality water), it is necessary for the traditional TiO2 and ZnO semiconductors to be replaced with the harmless, non-toxic, and more powerful nanocomposites as photocatalysts. Not only because of their higher efficiency as compared to the bulk semiconductors, but also because of the presence of biomolecules that can add up to the pollutant removal efficiency, which has been already confirmed in many researches. However, despite the fact that the application of heterogeneous photocatalysis together with green nanotechnology is absolutely the future in water purification, there are some challenges which have to be overcome. The exact effects of the biomolecules obtained from plants in the synthesis of nanoparticles, as well as in the photocatalytic processes, are not exactly known and require further investigation. Furthermore, heterogeneous photocatalysis is a well-known and commonly examined process; however, its practical use outside the laboratory is expensive and difficult. Thus, it has to be simplified and improved in order to be available for everyone. The aim of our review is to suggest and prove that using these bio-inspired compounds it is possible to reduce human footprint in the nature.

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Solar Photocatalytic Treatment of Dye Removal

Khalik

2022

Sustainable Textiles: Production, Processing, Manufacturing &Amp; Chemistry

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Fabrication of mesoporous titanium dioxide using azadirachta indica leaves extract towards visible-light-driven photocatalytic dye degradation

Cited by 20 publications

References 53 publications

Graphitic Carbon Nitride Composites with MoO₃-Decorated Co₃O₄ Nanorods as Catalysts for Oxygen and Hydrogen Evolution

Graphitic Carbon Nitride Composites with MoO₃-Decorated Co₃O₄ Nanorods as Catalysts for Oxygen and Hydrogen Evolution

Sustainable Green Nanotechnologies for Innovative Purifications of Water: Synthesis of the Nanoparticles from Renewable Sources

Solar Photocatalytic Treatment of Dye Removal

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Fabrication of mesoporous titanium dioxide using azadirachta indica leaves extract towards visible-light-driven photocatalytic dye degradation

Cited by 20 publications

References 53 publications

Graphitic Carbon Nitride Composites with MoO3-Decorated Co3O4 Nanorods as Catalysts for Oxygen and Hydrogen Evolution

Graphitic Carbon Nitride Composites with MoO3-Decorated Co3O4 Nanorods as Catalysts for Oxygen and Hydrogen Evolution

Sustainable Green Nanotechnologies for Innovative Purifications of Water: Synthesis of the Nanoparticles from Renewable Sources

Solar Photocatalytic Treatment of Dye Removal

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Graphitic Carbon Nitride Composites with MoO₃-Decorated Co₃O₄ Nanorods as Catalysts for Oxygen and Hydrogen Evolution

Graphitic Carbon Nitride Composites with MoO₃-Decorated Co₃O₄ Nanorods as Catalysts for Oxygen and Hydrogen Evolution