The novel zirconium oxide, nickel oxide and zinc oxide nanoparticles supported activated carbons (Zr-AC, Ni-AC, Zn-AC) were successfully fabricated through microwave irradiation method. The synthesized nanoparticles were characterized using XRD, HR-SEM, XPS and BET. The optical properties of Zr-AC, Ni-AC and Zn-AC composites were investigated using UV-Vis diffuse reflectance spectroscopy. The photocatalytic efficiency was verified in the degradation of textile dyeing wastewater (TDW) in UV light irradiation. The chemical oxygen demand (COD) of TDW was observed at regular intervals to calculate the removal rate of COD. Zn-AC composites showed impressive photocatalytic enrichment, which can be ascribed to the enhanced absorbance in the UV light region, the effective adsorptive capacity to dye molecules, the assisted charge transfer and the inhibited recombination of electron-hole pairs. The maximum TDW degradation (82% COD removal) was achieved with Zn-AC. A possible synergy mechanism on the surface of Zn-AC was also designed. Zn-AC could be reused five times without exceptional loss of its activity. © 2015 The Nonferrous Metals Society of China.

John Kennedy L

Physics

School of Advanced Sciences

Chennai Campus

Suresh P

Vijaya J.J

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Photocatalytic degradation of textile dyeing wastewater through microwave synthesized Zr-AC, Ni-AC and Zn-AC

Transactions of Nonferrous Metals Society of China

Nickel oxide nanoparticles supported activated carbon (NSAC) photocatalyst was successfully prepared using a cost-effective microwave irradiation method. The earned UV light-sensitive NSAC composites were characterized using powder X-ray diffraction, Fourier transform infrared spectroscopy, High-resolution scanning electron microscope with energy-dispersive X-ray analysis, X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller surface area analyzer. Optical properties of NSAC composites were investigated using UV–Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy, which exposed prolonged light absorption in UV light region and hold better charge separation capability, respectively, as compared to pure NiO. The photocatalytic activity was tested by the degradation of textile dye waste water (TDW) under UV light irradiation. Chemical oxygen demand of TDW was calibrated before and after the photocatalysis experiment under UV light to evaluate the mineralization of wastewater. The results demonstrated that NSAC composites showed imposing photocatalytic enrichment over pure NiO. The coordinated blending of the oxygen vacant sites, structural defects of NiO along with electron transmission capacity, and presence of surface oxygen on AC has led to the lasting light absorption, delayed charge recombination, and sustenance, which favor the enrichment of the photocatalytic activity of NSAC. © 2014 Balaban Desalination Publications. All rights reserved.

Desalination and Water Treatment

Synergy effect in the photocatalytic degradation of textile dyeing waste water by using microwave combustion synthesized nickel oxide supported activated carbon

Zinc oxide nanoparticle supported activated carbon (ZSAC) was successfully prepared using a cost effective microwave irradiation method. The earned UV light sensitive ZSAC composites were characterized using powder X-ray diffraction (XRD), high resolution scanning electron microscopy with energy dispersive X-ray analysis, and X-ray photoelectron spectroscopy. The optical properties of ZSAC composites were investigated using UV–Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy, which exposed prolonged light absorption in UV light region and hold better charge separation capability, respectively as compared to pure ZnO. The photocatalytic activity was tested by the degradation of textile dye waste water (TDW) under UV light irradiation. Chemical oxygen demand of TDW was calibrated before and after the photocatalysis experiment under UV light to evaluate the mineralization of wastewater. The results demonstrated that ZSAC composites showed imposing photocatalytic enrichment over pure ZnO and commercial TiO2 (Degussa P25). The coordinated blending of the oxygen vacant sites, structural defects of ZnO along with electron transmission capacity and presence of surface oxygen on AC has led to the lasting light absorption, delayed charge recombination, and sustenance, which favor the enrichment of the photocatalytic activity of ZSAC. © 2014, Akadémiai Kiadó, Budapest, Hungary.

Reaction Kinetics, Mechanisms and Catalysis

Synergy effect in the photocatalytic degradation of textile dyeing waste water by using microwave combustion synthesized zinc oxide supported activated carbon

Zirconium oxide nanoparticles supported activated carbon (ZrSAC) was successfully synthesized using a simple microwave irradiation method. The derived UV light sensitive ZrSAC composites were characterized using powder X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR), high resolution scanning electron microscope (HRSEM) with energy dispersive X-ray analysis (EDX), X-ray photoelectron spectroscopy (XPS), and Brunauer Emmett Teller (BET) surface area analyzer. Optical properties of ZrSAC composites were studied using UV-vis diffuse reflectance spectroscopy and photoluminescence spectroscopy (PL), which exposed prolonged light absorption in UV light region and hold better charge separation capability, respectively as compared to pure ZrO2. The photocatalytic activity was tested by the degradation of textile dye waste water (TDW) under UV light irradiation. Chemical oxygen demand (COD) of TDW was measured before and after the photocatalysis experiment under UV light to evaluate the mineralization of wastewater. The results demonstrated that ZrSAC composites showed a splendid photocatalytic enrichment over pure ZrO2. The coordinated blending of the oxygen vacant sites, structural defects of ZrO2 along with electron transmission capacity and presence of surface oxygen on AC has led to the lasting light absorption, delayed charge recombination, and sustenance, which favor the enrichment of the photocatalytic activity of ZrSAC. © 2014 Elsevier Ltd. All rights reserved.

Materials Science in Semiconductor Processing

Photocatalytic degradation of textile-dyeing wastewater by using a microwave combustion-synthesized zirconium oxide supported activated carbon

Journal of Bioprocess Engineering and Biorefinery

Two Stage-Two Step Activation Process for the Fabrication of Micro-Mesoporous Carbons from Rice Husk

ZnO nanomaterials with different morphologies such as nanoflakes, spherical nanoparticles (SNPs), and nanorods have been synthesized via a simple low temperature coprecipitation method. The concentration of the capping agent is a key factor in the morphological control of ZnO nanostructures. Triton X-100 micelles were found to be single molecules at low concentration but spherical and rod-like shaped micellar aggregation at higher concentrations. The formation of different morphologies of ZnO was confirmed by HR-SEM and HR-TEM. XRD data showed the formation of single-phase ZnO with the wurtzite crystal structure. The influence of Zr contents on the structure, morphology, absorption, emission, and photocatalytic activity of ZnO SNPs was investigated systematically. The influence of the ZnO morphologies on the photocatalytic degradation (PCD) of resorcinol as a model reaction is evaluated and discussed in terms of particle size, surface area, crystal growth habits, and oxygen defects. The results indicated that the particle size is an important factor for the PCD, and thus, the 1.5 wt % Zr-doped ZnO SNPs show superior performance toward PCD of resorcinol than other samples due to the small particle size distribution. Furthermore, the effect of different photocatalytic reaction parameters on the resulting PCD efficiency of ZnO SNPs was investigated. © 2012 American Chemical Society.

Journal	Data powered by TypesetTransactions of Nonferrous Metals Society of China
Publisher	Data powered by TypesetElsevier BV
ISSN	1003-6326
Open Access	0