Supported Bimetallic AgSn Nanoparticle as an Efficient Photocatalyst for Degradation of Methylene Blue Dye

NANO ◽  
2015 ◽  
Vol 10 (04) ◽  
pp. 1550059 ◽  
Author(s):  
Lipeeka Rout ◽  
Prashanth Rengasamy ◽  
Basanti Ekka ◽  
Aniket Kumar ◽  
Priyabrat Dash
Keyword(s):  
Methylene Blue ◽  
Surface Area ◽  
Sol Gel ◽  
Bet Surface Area ◽  
Blue Dye ◽  
X Ray Diffraction ◽  
Nanoparticle Catalysts ◽  
Image Mapping ◽  
Transmission Electron ◽  
Degradation Reaction

We report the synthesis of TiO 2-supported monometallic Ag , Sn and bimetallic AgSn nanoparticle catalysts prepared using sol–gel method via a rational nanoparticle encapsulation route. The samples were thoroughly characterized by ultraviolet-visible spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) with image mapping and Brunauer–Emmett–Teller (BET) surface area analyzer. The supported bimetallic AgSn catalyst had the anatase structure, surface area of 50 m2/g and 2.6 ± 0.6 nm particle size. The efficiency of the catalysts was evaluated on photodegradation of methylene blue (MB) dye under visible light. The photocatalytic activity of MB was significantly enhanced in the presence of bimetallic AgSn nanoparticles (NPs) as compared to individual metal nanoparticles. Reusability study of the photocatalyst showed that the catalyst can be reused upto 5 runs with minimal loss in activity. Kinetic study revealed that the degradation reaction follows a pseudo first-order pathway.

Effect of Rb+ -Doping on the Crystallization, Phase Transition and Photocatalytic Activity of Nanosized TiO2 Catalyst

2012 ◽  
Vol 476-478 ◽  
pp. 954-957 ◽  
Author(s):  
Zhao Hui Ni ◽  
Xiao Li Kou ◽  
Xin Yu Ding ◽  
Cun Wang Ge ◽  
Xiao Hui Jing
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Surface Area ◽  
Sol Gel ◽  
Rutile Phase ◽  
Bet Surface Area ◽  
X Rays ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Kinetics Of

In order to study the ion effect on titania phase structure, crystallite size, and photocatalytic activity, Rb+-doped TiO2 nanoparticles were prepared via a modified sol-gel method and characterized by means of X-ray diffraction, Energy Dispersive X-rays spectroscopy and transmission electron microscopy. The photocatalytic activity of the elaborated powders was studied following the degradation of methyl orange. The results indicate that doping Rb+ increases the BET surface area of TiO2 crystals, decreases the crystal size, reduces the diminishing rates of surface area with increasing calcinations temperature, raises the temperature at which anatase changes into rutile phase, and so significantly increases the photocatalytic activity of TiO2. The kinetics of the methyl orange degradation fits Langmuir-Hinshelwood kinetics model well.

Preparation of F-Zn-Codoped TiO2 Nanoparticles and its Applications in Photodegradation of Methylene Blue

2009 ◽  
Vol 79-82 ◽  
pp. 329-332
Author(s):  
Fa Tang Li ◽  
Rui Hong Liu ◽  
Xue Yan Li ◽  
Rong Yin
Keyword(s):  
Methylene Blue ◽  
Degradation Rate ◽  
Sol Gel ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tio2 Particles ◽  
Transmission Electron ◽  
Photocatalytic Activities ◽  
Simulated Wastewater

Nano-F/Zn/TiO2 particles were prepared by sol-gel method using NH4F and Zn(NO3)2 as dopants. The photocatalytic degradation of methylene blue in aqueous solution as simulated wastewater was used to evaluate their photocatalytic activities. The powders were characterized by energy dispersion X-ray spectrum (EDS), X-ray diffraction (XRD) transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) surface area analysis. The results showed that F and Zn elements were doped into TiO2. The appropriate codoping amount for F and Zn were n(F)/n(TiO2)=2% and n(Zn)/n(TiO2)=3% respectively. The degradation rate of methylene blue at 1 h was improved from 73.2% to 86.2% by using F/Zn/TiO2 as photocatalyst.

scholarly journals Facile Template In-Situ Fabrication of ZnCo2O4 Nanoparticles with Highly Photocatalytic Activities under Visible-Light Irradiation

2019 ◽  
Vol 14 (2) ◽  
pp. 404 ◽  
Author(s):  
Vu T. Tan ◽  
La The Vinh ◽  
Tran Ngoc Khiem ◽  
Huynh Dang Chinh
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Surface Area ◽  
Photoelectron Spectroscopy ◽  
High Specific Surface Area ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
X Ray ◽  
In Situ Fabrication ◽  
Transmission Electron

High specific surface area ZnCo2O4 nanoparticles were prepared via a sacrificial template accelerated hydrolysis by using nanoparticles of ZnO with highly polar properties as a template. The obtained ZnCo2O4 nanoparticles were characterized by the method of scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area measurements, Transmission electron microscopy (TEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The obtained nanoparticles were performed as a photocatalyst for the degradation of methylene blue in aqueous solution under visible irradiation. The photocatalytic degradation rate of methylene blue onto the synthesized ZnCo2O4 was higher than that of commercial ZnO and synthesized ZnO template. Copyright © 2019 BCREC Group. All rights reserved. 

Study of Heating Effect on Specific Surface Area, and Changing Optical Properties of ZnO Nanocrystals

2011 ◽  
Vol 403-408 ◽  
pp. 1205-1210
Author(s):  
Jaleh Babak ◽  
Ashrafi Ghazaleh ◽  
Gholami Nasim ◽  
Azizian Saeid ◽  
Golbedaghi Reza ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Energy Gap ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zno Nanocrystals ◽  
Transmission Electron ◽  
Zno Nanocrystal

In this work ZnO nanocrystal powders have been synthesized by using Zinc acetate dehydrate as a precursor and sol-gel method. Then the products have been annealed at temperature of 200-1050°C, for 2 hours. The powders were characterized using X-ray diffraction (XRD), UV-vis absorption and photoluminescence (PL) spectroscopy. The morphology of refrence ZnO nanoparticles have been studied using Transmission Electron Microscope (TEM). During the annealing process, increase in nanocrystal size, defects and energy gap quantitative, and decrease in specific surface area have been observed.

scholarly journals Synthesis and Characterisation of Mesoporous TiO2 Nanoparticles by Novel Surfactant Assisted Sol-gel Method for the Degradation of Organic Compounds

2018 ◽  
Vol 63 (1) ◽  
pp. 85-95 ◽  
Author(s):  
Harish Phattepur ◽  
Gowrishankar Bychapur Siddaiah ◽  
Nagaraju Ganganagappa
Keyword(s):  
Electron Microscopy ◽  
Tio2 Nanoparticles ◽  
Surface Area ◽  
Sol Gel ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
Tio2 Nps ◽  
Gel Method ◽  
X Ray ◽  
Surfactant Assisted

A sol-gel method was employed to synthesise pure titanium dioxide (TiO2) and surfactant assisted TiO2 nanoparticles (NPs). The effect of novel surfactant viz., Lauryl lactyl lactate on photocatalytic properties of TiO2 was studied. TiO2 NPs were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), UV-Vis Diffuse Reflectance spectra (DRS), Field emission scanning electron microscopy (FE-SEM), Transmission electron microscopy (TEM), Thermo gravimetric analysis (TGA), and Brunauer – Emmet - Teller (BET) surface area. Anatase phase of TiO2 was confirmed by X-Ray diffraction pattern and the crystallite size was between 9–19 nm. Addition of surfactant improved the BET surface area, surface defects, while the agglomeration of particles was reduced. DRS results revealed that the addition of surfactant to TiO2 sol induced a red shift of the absorption edge which resulted in the reduction of band gap from 3.23 to 3.21 eV. These physicochemical properties of TiO2 NPs were correlated with photocatalytic degradation of phenol. About 92% of phenol degradation was observed for surfactant assisted TiO2 NPs (SA-TiO2). Salicylic acid and caffeine were also degraded using SA-TiO2 NPs.

scholarly journals The Improved Photocatalytic Properties of Methylene Blue for V2O3/CNT/TiO2Composite under Visible Light

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Ming-Liang Chen ◽  
Won-Chun Oh
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Area Measurement ◽  
Bet Surface Area ◽  
Multiwall Carbon Nanotube ◽  
X Ray Diffraction ◽  
Vanadyl Acetylacetonate ◽  
X Ray ◽  
Transmission Electron

Multiwall carbon nanotube (MWCNT), vanadyl acetylacetonate (V(acac)3), and titaniumn-butoxide (TNB) were used as carbon, vanadium oxide, and titanium oxide precursor to prepare V2O3/CNT/TiO2composite. The obtained composite was characterized by BET surface area measurement, X-ray diffraction, transmission electron microscopy, and energy dispersive X-ray analysis. In addition, we used methylene blue (MB) solution under condition of visible light irradiation to determine their photocatalytic degradation efficiency. In conclusion, the V2O3/CNT/TiO2composite had excellent photocatalytic degradation for MB solution under visible light.

scholarly journals Curd Mediated Facile Synthesis of ZnO/Ag/NiO Heterostructures and Visible Light Assisted Photodegradation of Methylene Blue

2020 ◽  
Vol 32 (12) ◽  
pp. 3203-3208
Author(s):  
J.P. Shubha ◽  
B.S. Prathibha ◽  
N. Jayalakshmi
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Visible Light ◽  
Analytical Techniques ◽  
Zinc Nitrate ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Light Concentration

Green fuel perished curd was used to synthesize ZnO/Ag/NiO ternary heterostructure with zinc nitrate, nickel carbonate and silver nitrate as oxidizers. The obtained nanostructure was characterized by various analytical techniques such as powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (FESEM), transmission electron microscopy (TEM). The particles and flakes composition of ZnO/Ag/NiO nanomaterials was confirmed. Photocatalytic activity of ZnO/Ag/NiO was evaluated with methylene blue dye by source of light, concentration of hydrogen ion, catalyst and dye concentrations. The obtained ZnO/Ag/NiO nanoparticles reveal better catalytic property for the photodegradation of methylene blue dye under visible light.

Physicochemical Properties of Oxalic Acid-Modified Chitosan/Neem Leave Composites from Pessu River Crab Shell

2019 ◽  
Vol 17 (9) ◽  
Author(s):  
Oluwadayo Francis Asokogene ◽  
Muhammad Abbas Ahmad Zaini ◽  
Misau Muhammad Idris ◽  
Surajudeen Abdulsalam ◽  
Aliyu El-Nafaty Usman
Keyword(s):  
Methylene Blue ◽  
Oxalic Acid ◽  
Surface Area ◽  
Dye Adsorption ◽  
Textural Properties ◽  
Bet Surface Area ◽  
Blue Dye ◽  
Crab Shell ◽  
Sem Images ◽  
X Ray

Abstract This study was aimed to evaluate the characteristics of chitosan from Pessu river crab shell and its derivatives as prospective adsorbent. The synthesized chitosan (CH) was modified with 10 % (w/v) oxalic acid (CHOx), while the composites (CHOx-ANL1, CHOx-ANL2 and CHOx-ANL3) were designated according to the amount of activated neem leave (ANL). The materials were characterized by Fourier transform infrared (FTIR), energy-dispersive X-ray (EDAX), X-ray diffraction (XRD), scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET), thermal gravimetric (TGA) and methylene blue dye adsorption. The FTIR spectra of chitosan samples show the characteristics of primary and secondary amine/amide groups. The SEM images exhibit a tight, porous and fractured surface, which is covered with activated neem leave for the composites. The BET surface area of chitosan materials is in the increasing order of, CH < CHOx-ANL1 < CHOx-ANL2 < CHOx < CHOx-ANL3. CHOx-ANL3 displays a higher surface area of 389 m2/g, and 70.9 % mesoporosity. Despite its lower surface area of 258 m2/g (65.4 % mesoporosity), CHOx-ANL1 exhibits a greater methylene blue adsorption of 90.8 mg/g at dye concentration of 300 mg/L. The possible removal mechanisms include ionic interaction between dye molecules and functional groups, and surface adsorption due to the textural properties of chitosan samples. Chitosan from Pessu river crab shell and its derivatives are promising adsorbent candidate for dyes and heavy metals removal from water.

Preparation and Characterization of Ti0.6Cr0.4OxNy Nano-Sized Powder

2008 ◽  
Vol 368-372 ◽  
pp. 1130-1132
Author(s):  
Hong Zhi Wang ◽  
Qi Zhang ◽  
Yun Xin Gu ◽  
Yao Gang Li ◽  
Mei Fang Zhu
Keyword(s):  
Surface Area ◽  
Electron Probe ◽  
Auger Electron ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nano Powder ◽  
Transmission Electron ◽  
Cubic Structure

Ti0.6Cr0.4OxNy bimetallic metal oxynitride nano powder was synthesized by ammonolysis of the nanosized Cr2O3/TiO2 composite powder with n(Ti):n(Cr)=6:4 at 800oC for 8 h. The precursor and the resulting oxynitride were characterized by Auger electron spectroscope (AES), X-ray diffraction analysis (XRD), electron probe microanalysis (EPMA), transmission electron microscopy (TEM), and BET surface area techniques. The result indicated that the precursor was homogenous mixture of Cr2O3 and TiO2 with high BET surface area. The as-synthesized oxynitride powder contains only Ti0.6Cr0.4OxNy with cubic structure. The BET surface area of the oxynitride powder is 37.42 m2/g and the particle size is in the range of 20~30 nm.

scholarly journals Preparation of Stellerite Loading Titanium Dioxide Photocatalyst and Its Catalytic Performance on Methyl Orange

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Hua Chen ◽  
Jianhua Wang ◽  
Huajun Wang ◽  
Fei Yang ◽  
Jia-nan Zhou ◽  
...  
Keyword(s):  
Surface Area ◽  
Sol Gel ◽  
Catalytic Performance ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
Photocatalytic Ability ◽  
X Ray ◽  
Composite Photocatalysts ◽  
Ft Ir ◽  
Better Than

TiO2/stellerite composite photocatalysts were prepared by dispersing TiO2 onto the surface of HCl, NaOH, or NaCl treated stellerite using a sol-gel method. The materials were characterized by scanning electron microscopy (SEM), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FT-IR), BET surface area analysis, and X-ray diffraction (XRD). HCl and NaCl modification result in the promotion of the pore formation at the stellerite surfaces and induced the microscopic changes, while the surface morphology and structure of the stellerite were almost ruined by NaOH modification. Supported TiO2 calcinated at 200°C presented anatase structure. The photocatalytic degradation activities of TiO2 loaded HCl and NaCl modified stellerite were better than that of natural stellerite, accompanied with increasing specific surface area. On the contrary, NaOH modification induced the loss of photocatalytic ability of composite due to the generation of silicates.

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