PHOTOCATALYTIC DEGRADATION OF ORGANIC DYE USING NANO ZnO

2011 ◽  
Vol 10 (01n02) ◽  
pp. 253-257 ◽  
Author(s):  
R. SARAVANAN ◽  
H. SHANKAR ◽  
G. RAJASUDHA ◽  
A. STEPHEN ◽  
V. NARAYANAN
Keyword(s):  
Thermal Decomposition ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Decomposition Method ◽  
Zinc Acetate Dihydrate ◽  
Chemical Precipitation ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Acetate Dihydrate ◽  
Thermal Decomposition Method

Photocatalytic degradation of methylene blue was investigated using nanocrystalline ZnO prepared by chemical precipitation and thermal decomposition routes. In both preparation routes zinc acetate dihydrate was used as the precursor. In the case of precipitation route, sodium hydroxide was used as the precipitating agent at room temperature, but in thermal decomposition method the precursor was just calcined at 450°C for 30 min. The structural and morphological properties were studied by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy (SEM). The sample prepared by precipitation route exhibits higher photocatalytic activity than that by thermal decomposition method and the reasons for the enhanced photocatalytic activity have been discussed in detail.

Magnetic Property of á-Fe Nanoparticles Prepared by Solventless Thermal Decomposition Method

2006 ◽  
Vol 962 ◽  
Author(s):  
Young Chul Han
Keyword(s):  
Thermal Decomposition ◽  
Decomposition Method ◽  
High Vacuum ◽  
Vacuum System ◽  
X Ray Diffraction ◽  
Thermal Decomposition Method ◽  
Transmission Electron ◽  
Gas Atmosphere ◽  
Fe Nanoparticles ◽  
Pyrex Tube

ABSTRACTNano sized α-Fe particle was synthesized by modified thermal decomposition method. It resulted in the higher saturation magnetization (Ms) almost equivalent to the value of bulk Fe power (Mbulk = 210 emu/g). To prepare Fe nanoparticles, the Fe2+-(oleate)2 complex was annealed at 400 J in pyrex tube and the prepared Fe3O4 nanoparticle was reduced to Fe crystal structure at 700 J with NaCl under Ar+H2 gas atmosphere and annealed again under high vacuum system of 10−5 torr. The crystallinity and structure of the Fe nanoparticle was investigated by powder X-ray diffraction (XRD). The shape and size was confirmed by transmission electron microscope (TEM) images. The magnetic properties were characterized with coercivity and remanence from hysteresis loop by vibrating sample magnetometer (VSM)

scholarly journals Extraction of Hydroxyapatite from Fish Scales and Its Integration with Rice Husk for Ammonia Removal in Aquaculture Wastewater

2019 ◽  
Vol 19 (4) ◽  
pp. 1019
Author(s):  
Sofiah Hamzah ◽  
Norhafiza Ilyana Yatim ◽  
Maslinda Alias ◽  
Asmadi Ali
Keyword(s):  
Thermal Decomposition ◽  
Rice Husk ◽  
Decomposition Method ◽  
Ammonia Removal ◽  
Fish Scales ◽  
X Ray Diffraction ◽  
Coating Agent ◽  
X Ray ◽  
Thermal Decomposition Method ◽  
Aquaculture Wastewater

Aquaculture plays an important role in providing food and generate high income in many developing countries but the abundance of ammonia discharged from aquaculture wastewater gives the problem to the environment. This study focused on the extraction of hydroxyapatite (HAp) from fish scales and its modification with rice husk to produce bio-adsorbent for ammonia removal from aquaculture wastewater. The comparison has been made for the HAp preparation via microwave irradiation, alkaline heat treatment, and thermal decomposition method. X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR) were used to analyze the surface chemistry and crystallinity of HAp, respectively. While the morphology of the HAp was observed under a Scanning Electron Microscope (SEM). Hydroxyapatite extracted via thermal decomposition method shows the best performance about 79% of ammonia removal at 210 min contact time which selected for coating agent of rice husk (RH/HAp) and was successfully removed 84% at 60 min saturation time. The result shows thermal decomposition is the best technique to extract HAp from fish scales and its integration with rice husk exhibited a better performance of bio-adsorbent. The findings of this study provide useful fundamental knowledge and platform for the development and improvement of aquaculture wastewater treatment system in the future.

scholarly journals Synthesis of Transition Metal Dichalcogenides based hybrid nanostructures by thermal decomposition method

2021 ◽  
Vol 2070 (1) ◽  
pp. 012095
Author(s):  
Melbin Baby ◽  
K. Rajeev Kumar
Keyword(s):  
Electron Microscopy ◽  
Thermal Decomposition ◽  
Decomposition Method ◽  
Transition Metal Dichalcogenides ◽  
Hybrid Nanostructures ◽  
Hybrid Nanostructure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermal Decomposition Method ◽  
Metal Dichalcogenides

Abstract In this work, we report synthesis of hybrid nanostructures of Transition Metal Dichalcogenides via thermal decomposition method. Ammonium tetrathiomolybdate was used as not only growth templates but also as starting precursor for synthesis of hybrid nanostructures. The conditions for the synthesizing method were optimized using electron microscopy and x-ray diffraction. In this hybrid nanostructure synthesis, it was found that MoO3 nanorods are interspersed on exfoliated MoS2 nanosheets. The structural and optical properties of the hybrid nanostructure were investigated using transmission electron microscopy (TEM), Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy and Ultraviolet Visible spectrophotometry (UV-VIS). The hybrid nanostructure of MoO3 on MoS2 shows a band gap of 2.2 eV. It was also found that by tuning the preparation parameters viz temperature of heating and time of heating, the composition of the hybrid nanostructure can be varied.

Photocatalytic Degradation of Organic Dyes Using ZnO/CeO2 Nanocomposite Material under Visible Light

2012 ◽  
Vol 584 ◽  
pp. 381-385 ◽  
Author(s):  
R. Saravanan ◽  
N. Karthikeyan ◽  
S. Govindan ◽  
V. Narayanan ◽  
A. Stephen
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Organic Dyes ◽  
Decomposition Temperature ◽  
Morphological Properties ◽  
Synthesis Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermal Decomposition Method ◽  
Bet Method

Nanorods of ZnO/CeO2 were synthesized by thermal decomposition method. The decomposition temperature and formation of composite material were confirmed by the thermogravimetric analysis (TGA) before the synthesis process. The prepared samples were characterized by different techniques. The structural and morphological properties of ZnO/CeO2 nanorods were confirmed by X-ray diffraction (XRD) and high resolution scanning electron microscopy (HR-SEM). The chemical composition and specific surface area analysis were done by energy dispersive X-ray spectroscopy (EDX) and Brunauer–Emmett–Teller (BET) method. Further the catalyst was used for photocatalytic degradation of organic dye under visible light irradiation

Phase Transition and Microstructure Development of BaTiO3 by Thermal Development of BaTiO3 by Thermal Decomposition Method

2018 ◽  
Vol 879 ◽  
pp. 13-17
Author(s):  
Sudarath Suntaropas ◽  
Panakamon Thonglor ◽  
Naphat Albutt
Keyword(s):  
Thermal Decomposition ◽  
Decomposition Method ◽  
Sintering Temperature ◽  
Particle Growth ◽  
Microstructure Development ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermal Decomposition Method ◽  
Thermal Development ◽  
Major Factors

The thermal decomposition was used to prepare BaTiO3 powders. Using BaCO3 and TiO2 powders as precursors and heat treatment in the temperature range of 600-1000 °C for 6 hr. The final product (BaTiO3) proceeds through a trace amount of Ba2TiO4. The phase transformation was investigated by X-ray diffraction (XRD) as a function of sintering temperature. The results show that the microstructures of BaTiO3 were developed during sintering at different temperature. In additional, the particle growth of BaCO3 and TiO2 are the major factors to affect of the particle growth mechanism.

Mechanical-assisted preparation and photocatalytic properties of almost-visible light-driven ZnO/ZnFe2O4 nanocomposites

2014 ◽  
Vol 1641 ◽  
Author(s):  
Jiaqian Qin ◽  
Yanan Xue ◽  
Xinyu Zhang ◽  
Riping Liu
Keyword(s):  
Thermal Decomposition ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Aqueous Medium ◽  
Decomposition Method ◽  
Low Cost ◽  
Thermal Decomposition Method ◽  
Visible Light Driven ◽  
Shape And Size

ABSTRACTZnO and ZnO/ZnFe2O4 nanocomposites were synthesized by mechanical-assisted thermal decomposition method. The results show that this method is a simple and low cost method to prepare ZnO and ZnO/ ZnFe2O4 nanocomposites. The nanorod's shape and size have been identified through SEM and TEM. The photocatalytic activity of ZnO and ZnO/ZnFe2O4 nanocomposites were tested by the degradation of methylene blue (MB) in aqueous medium under almost-visible light and the efficiency of the catalyst has been discussed in detail.

Sign in / Sign up

Export Citation Format

Share Document