scholarly journals Photocatalytic Degradation of Methylene Blue and Metanil Yellow Dyes Using Green Synthesized Zinc Oxide (ZnO) Nanocrystals

Crystals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 22
Author(s):  
S. Shwetha Priyadharshini ◽  
Jayachamarajapura Pranesh Shubha ◽  
Jaydev Shivalingappa ◽  
Syed Farooq Adil ◽  
Mufsir Kuniyil ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Cost Effective ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zno Nanocrystals ◽  
Cost Effective Method ◽  
Photocatalytic Activities ◽  
Ft Ir ◽  
Metanil Yellow

In this work, ZnO nanocrystals (NCs) have been effectively synthesized by a simple, efficient and cost-effective method using coconut husk extract as a novel fuel. The synthesized NCs are characterized by UV-Vis, XRD, FT-IR, SEM, EDX, Raman and PL studies. The obtained ZnO were found to be UV-active with a bandgap of 2.93 eV. The X-ray diffraction pattern confirms the crystallinity of the ZnO with hexagonally structured ZnO with a crystallite size of 48 nm, while the SEM analysis reveals the hexagonal bipyramid morphology. Photocatalytic activities of the synthesized ZnO NCs are used to degrade methylene blue and metanil yellow dyes.

scholarly journals Phytoassisted synthesis of magnesium oxide nanoparticles from Pterocarpus marsupium rox.b heartwood extract and its biomedical applications

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Manne Anupama Ammulu ◽  
K. Vinay Viswanath ◽  
Ajay Kumar Giduturi ◽  
Praveen Kumar Vemuri ◽  
Ushakiranmayi Mangamuri ◽  
...  
Keyword(s):  
Magnesium Oxide ◽  
Cost Effective ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
Pterocarpus Marsupium ◽  
X Ray ◽  
Magnesium Oxide Nanoparticles ◽  
Cost Effective Method ◽  
Ft Ir ◽  
Crystalline Nature

Abstract Background Unlike chemical techniques, the combination of metal oxide nanoparticles utilizing plant concentrate is a promising choice. The purpose of this work was to synthesize magnesium oxide nanoparticles (MgO-NPs) utilizing heartwood aqueous extract of Pterocarpus marsupium. The heartwood extract of Pterocarpus marsupium is rich in polyphenolic compounds and flavonoids that can be used as a green source for large-scale, simple, and eco-friendly production of MgO-NPs. The phytoassisted synthesis of MgO is characterized by UV-Visible spectroscopy, X-ray diffraction (XRD), dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) with EDS (energy dispersive X-ray spectroscopy), and transmission electron microscopy (TEM). Results The formation of MgO-NPs is confirmed by a visual color change from colorless to dark brown and they displayed a wavelength of 310 nm in UV-Spectrophotometry analysis. The crystalline nature of the obtained biosynthesized nanoparticles are revealed by X-ray diffraction analysis. SEM results revealed the synthesized magnesium oxide nanoparticles formed by this cost-effective method are spherically shaped with an average size of < 20 nm. The presence of magnesium and oxygen were confirmed by the EDS data. TEM analysis proved the spherical shape of the nanoparticles with average particle size of 13.28 nm and SAED analysis confirms the crystalline nature of MgO-NPs. FT-IR investigation confirms the existence of the active compounds required to stabilize the magnesium oxide nanoparticles with hydroxyl and carboxyl and phenolic groups that act as reducing, stabilizing, and capping agent. All the nanoparticles vary in particle sizes between 15 and 25 nm and obtained a polydispersity index value of 0.248. The zeta-potential was measured and found to be − 2.9 mV. Further, MgO-NPs were tested for antibacterial action against Staphylococcus aureus (Gram-positive bacteria) and Escherichia coli (Gram-negative bacteria) by minimum inhibitory concentration technique were found to be potent against both the bacteria. The blended nanoparticles showed good antioxidant activity examined by the DPPH radical scavenging method, showed good anti-diabetic activity determined by alpha-amylase inhibitory activity, and displayed strong anti-inflammatory activity evaluated by the albumin denaturation method. Conclusions The investigation reports the eco-friendly, cost-effective method for synthesizing magnesium oxide nanoparticles from Pterocarpus marsupium Rox.b heartwood extract with biomedical applications. Graphical abstract

scholarly journals Synthesis of Magnetic Ferrocene-Containing Polymer with Photothermal Effects for Rapid Degradation of Methylene Blue

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 558
Author(s):  
Wenhui Zhu ◽  
Caiyun Zhang ◽  
Yali Chen ◽  
Qiliang Deng
Keyword(s):  
Methylene Blue ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Degradation Rate ◽  
Model Compound ◽  
Vibrating Sample Magnetometer ◽  
Simulated Sunlight ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir

Photothermal materials are attracting more and more attention. In this research, we synthesized a ferrocene-containing polymer with magnetism and photothermal properties. The resulting polymer was characterized by Fourier-transform infrared (FT-IR), vibrating sample magnetometer (VSM), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). Its photo-thermocatalytic activity was investigated by choosing methylene blue (MB) as a model compound. The degradation percent of MB under an irradiated 808 nm laser reaches 99.5% within 15 min, and the degradation rate is 0.5517 min−1, which is 145 times more than that of room temperature degradation. Under irradiation with simulated sunlight, the degradation rate is 0.0092 min−1, which is approximately 2.5 times more than that of room temperature degradation. The present study may open up a feasible route to degrade organic pollutants.

scholarly journals Hydrothermal Synthesis, Characterization and Exploration of Photocatalytic Activities of Polyoxometalate: Ni-CoWO4 Nanoparticles

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 456
Author(s):  
Fahad A. Alharthi ◽  
Hamdah S. Alanazi ◽  
Amjad Abdullah Alsyahi ◽  
Naushad Ahmad
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Structure Morphology ◽  
Photocatalytic Activities ◽  
Ft Ir ◽  
Photocatalytic Reactions ◽  
Cobalt Tungstate

This study demonstrated the hydrothermal synthesis of bimetallic nickel-cobalt tungstate nanostructures, Ni-CoWO4 (NCW-NPs), and their phase structure, morphology, porosity, and optical properties were examined using X-ray Diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), Scanning electron microscopy- energy dispersive X-ray spectroscopy (SEM-EDS), high resolution Transmission electron microscopy (HR-TEM), Brunauer-Emmett-Teller (BET) and Raman instruments. It was found that as-calcined NCW-NPs have a monoclinic phase with crystal size ~50–60 nm and is mesoporous. It possessed smooth, spherical, and cubic shape microstructures with defined fringe distance (~0.342 nm). The photocatalytic degradation of methylene blue (MB) and rose bengal (RB) dye in the presence of NCW-NPs was evaluated, and about 49.85% of MB in 150 min and 92.28% of RB in 90 min degraded under visible light. In addition, based on the scavenger’s study, the mechanism for photocatalytic reactions is proposed.

scholarly journals Ultrasound-Assisted Rapid ZIF-8 Synthesis, Porous ZnO Preparation by Heating ZIF-8, and Their Photocatalytic Activity

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Pham Dinh Du ◽  
Nguyen Trung Hieu ◽  
Tran Vinh Thien
Keyword(s):  
Photocatalytic Activity ◽  
Room Temperature ◽  
Diffuse Reflectance ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Zeolitic Imidazolate Framework ◽  
X Ray ◽  
Photocatalytic Activities ◽  
Ft Ir ◽  
Adsorption Desorption

Zeolitic imidazolate framework-8 (ZIF-8) is synthesized quickly at room temperature in methanol with the support of ultrasound. Porous ZnO is also prepared via the thermal treatment of ZIF-8. The photocatalytic activities of the obtained materials are demonstrated via methylene blue (MB) decomposition under UV radiation. The obtained materials are characterized by means of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), nitrogen adsorption/desorption isotherms, UV-Vis diffuse reflectance spectra (DR-UV-Vis), and photoluminescence spectra. The results indicate that ZIF-8 and the materials obtained from ZIF-8 by heating in the air have photocatalytic activity under UV irradiation. The ZnO sample obtained by ZIF-8 calcination at 660°C for 5 h has the highest photocatalytic activity. However, the MB degradation photocatalytic efficiency of the ZnO samples is even lower than that of the ZIF-8 samples, indicating that ZIF-8 is an effective photocatalyst in the treatment of environmental pollution.

scholarly journals Sardine Scales: A Promising Source of Marine Biomaterials

2021 ◽  
Vol 11 (4) ◽  
pp. 3954-3960
Keyword(s):  
Physicochemical Characteristics ◽  
Sem Analysis ◽  
Added Value ◽  
Fish Scales ◽  
X Ray Diffraction ◽  
Marine Litter ◽  
Electron Dispersive Spectroscopy ◽  
X Ray ◽  
Ft Ir ◽  
Promising Source

The current paper highlighted the physicochemical characteristics of sardine scales (S.pilchardus), which are considered hitherto as solid marine litter despite their richness on biomaterials of high added value. The collected fish scales were washed thoroughly, dried, and grounded into a powder. The prepared samples were characterized using infrared spectroscopy (FT-IR), x-ray diffraction (XRD), scanning electron microscopy coupled with electron dispersive spectroscopy (SEM/EDS). The findings of (FT-IR); (XRD); and (EDS) show that sardine scales contain both organic and inorganic phases. The (SEM) analysis has revealed that sardine scales have a porous and fibrous structure. The physicochemical results confirm that S.pilchardus scales are a pioneering source of marine biomaterials.

Novel and naturally derived Hydroxyapatite/cellulose nanofibre/curcumin biocomposite for tissue engineering applications

2021 ◽  
Author(s):  
Sridevi S ◽  
Ramya S ◽  
Kavitha L ◽  
Gopi Dhanaraj
Keyword(s):  
Tissue Engineering ◽  
Engineering Application ◽  
Hardness Test ◽  
Cost Effective ◽  
Biological Properties ◽  
Fish Bone ◽  
Tissue Engineering Application ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir

Abstract Hydroxyapatite (HAp) based composite materials are attaining increasing interest as a potential therapeutic agent for tissue engineering application. In the present study, HAp based composite material is synthesized from biowaste in a cost effective way. Fish bone derived HAp is combined with a cellulose nanofibre (CNF) and curcumin (Cur) as a composite for enhanced thermal, biological and mechanical properties. The HAp/CNF/Cur composite is prepared with different concentrations of CNF (1–3.wt%) and Cur (0.5–1.5 wt%), respectively. Different characterization techniques like Fourier transform-infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Field-emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) and thermal gravimetric (TGA) analysis were engaged to assess the functional groups, phase composition, morphology, elemental composition and thermal analysis of the composite. The mechanical strength of the composite is examined using Vickers micro-hardness test. In addition, antibacterial nature of the composite is evaluated against negative and positive bacteria. The viability of human osteosarcoma MG 63 cells over the composite is studied at different concentrations of 1, 3, 7, 10 and 15 µg for 24 h of incubation. Overall, the present investigation shows that the as-synthesized HAp/CNF/Cur composite with enhanced thermal, mechanical and biological properties will be a prospective aspirant for tissue engineering therapeutics.

scholarly journals Pyrolysis Synthesized g-C3N4for Photocatalytic Degradation of Methylene Blue

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Gang Xin ◽  
Yali Meng
Keyword(s):  
Methylene Blue ◽  
Fourier Transform ◽  
Photocatalytic Activity ◽  
Carbon Nitride ◽  
Diffuse Reflectance ◽  
Photogenerated Electron ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Uv Visible

Graphitic carbon nitride (g-C3N4) was synthesized at 520°C by the pyrolysis of cyanamide, dicyandiamide, and melamine. The samples were characterized by X–ray diffraction (XRD), UV-visible diffuse reflectance spectra, Fourier transform infrared spectroscopy (FT-IR), and elemental analyzer. The photocatalytic activity of g-C3N4was evaluated by the photodegrading experiments of methylene blue (MB). The results indicated that g-C3N4. A photocatalytic mechanism presumed the MB photodegradation over the C3N4photocatalyst is attributed to photogenerated electron impelled multistep reduction of O2.

scholarly journals Co/TiO2 nanoparticles: preparation, characterization and its application for photocatalytic degradation of methylene blue

2018 ◽  
Author(s):  
azadeh ebrahimian pirbazari ◽  
Pejman Monazzam ◽  
Behnam Fakhari Kisomi
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Tio2 Nanoparticles ◽  
Anatase Phase ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Cobalt Doping ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir

In this work, TiO2 nanoparticles containing different amounts of cobalt were synthesized by sol-gel method using titanium (IV) isopropoxide and cobalt chloride as titanium and cobalt precursors, respectively. X-ray diffraction (XRD) results showed prepared samples include 100% anatase phase. The presence of cobalt in TiO2 nanoparticle network was established by XRD, scanning electron microscopy equipped with energy dispersive X-ray microanalysis (SEM-EDX), Fourier transform infrared (FT-IR) and N2 physisorption techniques. The increase of cobalt doping enhanced redshif in the diffuse reflectance spectra. The photocatalytic activity of the prepared samples was tested for degradation of methylene blue (MB) as a model of dye. Although the photocatalytic activity of pure TiO2 was found to be higher than that of Co/TiO2 samples under UV irradiation, the presence of 0.24% cobalt dopant in TiO2 nanoparticles resulted in a photocatalyst with the highest activity under visible light

scholarly journals Effect of Aeration Treatment on Methylene Blue Removal Using TiO2-Zeolite

2019 ◽  
Vol 2 ◽  
pp. 219-224
Author(s):  
Nanda Alzeta Pratama ◽  
Pedy Artsanti
Keyword(s):  
Methylene Blue ◽  
Fourier Transform ◽  
Contact Time ◽  
Fourier Transform Infrared ◽  
Absolute Ethanol ◽  
X Ray Diffraction ◽  
X Ray ◽  
Methylene Blue Removal ◽  
Ft Ir

Effect of aeration treatment on Methylene Blue (MB) removal using TiO2-Zeolite has been investigated. The TiO2-Zeolite was prepared by mixing activated zeolite and TiO2 in absolute ethanol. This composite was characterized using Fourier Transform Infrared (FT-IR) and X-Ray Diffraction (XRD). The MB removal was monitored spectrophotometrically. The effect of contact time, composite mass, and aeration treatment on MB removal was observed. Characterization results showed that there was interaction between TiO2 and SiO/AlO of zeolite. The observation of aeration treatment using oxygen exhibited significant improving on MB removal.

scholarly journals Quantification of Kaolinite and Halloysite Using Machine Learning from FTIR, XRF, and Brightness Data

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1350
Author(s):  
Pieter I. Du Plessis ◽  
Michael F. Gazley ◽  
Stephanie L. Tay ◽  
Eliza F. Trunfull ◽  
Manuel Knorsch ◽  
...  
Keyword(s):  
Cost Effective ◽  
X Ray Diffraction ◽  
Yilgarn Craton ◽  
Weathering Profile ◽  
X Ray ◽  
Clay Deposits ◽  
Cost Effective Method ◽  
Cost Effective Alternative ◽  
Quantified Analysis

Quantification of halloysite and kaolinite in clay deposits from X-ray diffraction (XRD) commonly requires extensive sample preparation to differentiate the two phyllosilicates. When assessing hundreds of samples for mineral resource estimations, XRD analyses may become unfeasible due to time and expense. Fourier transform infrared (FTIR) analysis is a fast and cost-effective method to discriminate between kaolinite and halloysite; however, few efforts have been made to use this technique for quantified analysis of these minerals. In this study, we trained machine- and deep-learning models on XRD data to predict the abundance of kaolinite and halloysite from FTIR, chemical composition, and brightness data. The case study is from the Cloud Nine kaolinite–halloysite deposit, Noombenberry Project, Western Australia. The residual clay deposit is hosted in the saprolitic and transition zone of the weathering profile above the basement granite on the southwestern portion of the Archean Yilgarn Craton. Compared with XRD quantification, the predicted models have an R2 of 0.97 for kaolinite and 0.96 for halloysite, demonstrating an excellent fit. Based on these results, we demonstrate that our methodology provides a cost-effective alternative to XRD to quantify kaolinite and halloysite abundances.

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