scholarly journals Photocatalytic activity of Ag/Ni bi-metallic nanoparticles on textile dye removal

2019 ◽  
Vol 8 (1) ◽  
pp. 895-900 ◽  
Author(s):  
Santhanam Mohan ◽  
Manickam Vishnu Devan
Keyword(s):  
Metallic Nanoparticles ◽  
Dye Degradation ◽  
Uv Light ◽  
Wide Band ◽  
Zingiber Officinale ◽  
Band Gap Energy ◽  
Nano Particles ◽  
Textile Dye ◽  
Green Approach ◽  
Short Period

Abstract The photocatalysis of Ag/Ni bi-metallic nano-particles on safranin O dye degradation was evaluated by UV light irradiations. Ag/Ni bi-metallic nanoparticles were synthesized by the green approach using Zingiber officinale root (Zinger) extract. The average particles size of Ag/Ni bi-metallic nanoparticles was found to be 70-88 nm from SEM image and from XRD patterns it was confirmed that the existence of Ag/Ni bi-metallic nano-particles. 8 mg of Ag/Ni bi-metallic nanoparticles present in 40 mL of 10 ppm dye, degraded completely in presence of UV light irradiations within 30 min time durations. The effect of dye degradation within a short period of time (30 min) was due to wide band gap energy and photochemical redox reactions.

Synthesis of Mesoporous Titania–Silica Monolith Composites — A Comprehensive Study on their Photocatalytic Degradation of Acid Blue 113 Dye Under UV Light

2016 ◽  
Vol 15 (05n06) ◽  
pp. 1660012 ◽  
Author(s):  
Thurlapathi VL Thejaswini ◽  
Deivasigamani Prabhakaran
Keyword(s):  
Photocatalytic Activity ◽  
Dye Degradation ◽  
Uv Light ◽  
Degradation Kinetics ◽  
High Surface ◽  
Textile Dye ◽  
Silica Monoliths ◽  
Bet Analysis ◽  
Acid Blue 113 ◽  
Acid Blue

The present work deals with the synthesis of bi-continuous macro and mesoporous crack-free titania–silica monoliths, with well-defined structural dimensions and high surface area. The work also highlights their potential photocatalytic environmental applications. The highly ordered titania–silica monoliths are synthesized through direct surface template method using organic precursors of silica and titania in the presence of surface directing agents such as pluronic P123 and PEG, under acetic acid medium. The monoliths are synthesized with different Ti/Si ratios to obtain monolithic designs that exhibit better photocatalytic activity for dye degradation. The titania–silica monoliths are characterized using XRD, SEM, EDAX, FT-IR, TG–DTA and BET analysis. The photocatalytic activity of the synthesized monoliths is tested on the photodegradation of a textile dye (acid blue 113). It is observed that the monolith with 7:3 ratio of Ti/Si showed significant photocatalysis behavior in the presence of UV light. The influence of various physico-chemical properties such as, solution pH, photocatalyst dosage, light intensity, dye concentration, effect of oxidants, etc. are analyzed and optimized using a customized photoreactor set-up. Under optimized conditions, the monoliths exhibited superior degradation kinetics, with the dye dissipation complete within 10[Formula: see text]min of photolysis. The mesoporous catalysts are recoverable and reusable up to four cycles of repeated usage.

scholarly journals Improving the Performance of Zinc Oxide Photocatalysts for Phenol Degradation through Addition of Lanthanum Species

2020 ◽  
Vol 23 (4) ◽  
pp. 109-116
Author(s):  
Wynona Agatha Nimpoeno ◽  
Hendrik Oktendy Lintang ◽  
Leny Yuliati
Keyword(s):  
Zinc Oxide ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Phenol Degradation ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Band Gap Energy ◽  
Fluorescence Emission Spectra ◽  
Green Approach ◽  
La Addition

One green approach to degrade organic pollutants, such as phenol, is through the photocatalytic reaction. Despite having large band gap energy, which is enough for phenol degradation, zinc oxide (ZnO) has low photocatalytic efficiency. In this study, ZnO was modified by lanthanum (La) species, and the improved photocatalytic activity was confirmed for degradation of phenol under visible and ultraviolet (UV) light irradiation. The ZnO and its modified photocatalysts were prepared by the hydrothermal method in the absence and presence of La species (0.01‒2 wt%). X-ray diffraction (XRD) patterns showed that the addition of La did not disturb the structure of ZnO, but slightly decreased the crystallite size. While the La addition up to 1 wt% did not affect the optical properties of the ZnO, the addition of 2 wt% La slightly red-shifted the absorption band edge of the ZnO. The Fourier-transform infrared (FT-IR) spectra showed La oxide formation observed at 515-540 cm-1 after 2 wt% La addition. Fluorescence emission spectra revealed that synthesized ZnO has oxygen vacancies at 558 nm, and the presence of 1 wt% La did not significantly affect the emission intensity. The photocatalytic activity of ZnO was influenced by the La addition, where the best performance was obtained on the ZnO with 1 wt% La. This study demonstrated that the optimum amount of La species could increase the performance of the ZnO.

scholarly journals Fabrication of Nanosized Reactive Nickel Oxide Composite Particles for Degradation of Textile Dye

2017 ◽  
Vol 9 (4) ◽  
pp. 413-420
Author(s):  
S. Akhtar ◽  
M. A. Alam ◽  
H. Ahmad
Keyword(s):  
Dye Degradation ◽  
Uv Light ◽  
Industrial Effluent ◽  
Maximum Efficiency ◽  
Composite Particles ◽  
Textile Dye ◽  
Simple Liquid ◽  
Nanocomposite Particles ◽  
Seed Particles ◽  
Cr Concentration

In this research we focused on to develop new nanocomposite materials that have capacity to de-colorize and degrade industrial effluent. At first NiO nanoparticle were synthesized by simple liquid phase process using Ni(NO3)2.6H2O and NH4OH followed by calcinations of the produced Ni(OH)2 as precursor at 400°C. NiO nanoparticles were modified to produce NiO/SiO2 nanocomposite particles. Finally tri-layered inorganic/organic nanocomposite particles were prepared by seeded polymerization of epoxide functional monomer, glycidyl methacrylate (GMA) in presence of NiO/SiO2 nanocomposite seed particles. The composite particles were named as NiO/SiO2/PGMA and the obtained particles were utilized as a photocatalyst for the UV-light assisted degradation of congo red (CR), a model azo dye. Degradation efficiency decreased with the increase of initial CR concentration and a maximum efficiency of 100% was achieved when the CR concentration was 40 mg/L.

scholarly journals Fenton Process Coupled to Ultrasound and UV Light Irradiation for the Oxidation of a Model Pollutant

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Karen E. Barrera-Salgado ◽  
Gabriela Ramírez-Robledo ◽  
Alberto Álvarez-Gallegos ◽  
Carlos A. Pineda-Arellano ◽  
Fernando Z. Sierra-Espinosa ◽  
...  
Keyword(s):  
Dye Degradation ◽  
Uv Light ◽  
Textile Dye ◽  
Fenton Process ◽  
Treatment Efficiency ◽  
Solution Ph ◽  
Fixed Amount ◽  
Uv Light Irradiation ◽  
Supporting Material ◽  
The Stability

The Fenton process coupled to photosonolysis (UV light and Us), using Fe2O3catalyst supported on Al2O3, was used to oxidize a model pollutant like acid green 50 textile dye (AG50). Dye degradation was followed by AG50 concentration decay analyses. It was observed that parameters like iron content on a fixed amount of catalyst supporting material, catalyst annealing temperature, initial dye concentration, and the solution pH influence the overall treatment efficiency. High removal efficiencies of the model pollutant are achieved. The stability and reusability tests of the Fe2O3catalyst show that the catalyst can be used up to three cycles achieving high discoloration. Thus, this catalyst is highly efficient for the degradation of AG50 in the Fenton process.

scholarly journals Single probes of Fe3O4 Nanorods on textile dye degradation in waste-water treatment

2021 ◽  
Author(s):  
S. Mohan ◽  
K. Ravikumar ◽  
V. Shanmugam ◽  
K. Elangovan ◽  
M. Vishnu Devan ◽  
...  
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Dye Degradation ◽  
Waste Water Treatment ◽  
Methyl Violet ◽  
Ultra Violet ◽  
Textile Dye ◽  
Light Illumination ◽  
Green Approach ◽  
Hazardous Pollutants

Abstract The process of removing cancer-causing colours from modern effluents before releasing them into water sources such as rivers, lakes, and groundwater has become standard. Traditional waste-water treatment systems have such great difficulties in eliminating these contaminants. The current one is a unique flavonoids synthesis employing Fe3O4 nanorods that have been utilized as photocatalytic to degrade material color in the watery stage using noticeable light illumination. Flavonoids@Fe3O4 nanorods were blended by green methodology. The vanishing of the ultra-violet (UV) retention top that appeared at 581 nm affirmed the evacuation of the Methyl violet color. Following 60 minutes of duration, the dramatic color elimination by Fe3O4 nanorod was noticed to be 97 percent. The findings demonstrate that the Fe3O4 nanorods made using the green approach are immensely beneficial in the photocatalytic destruction of hazardous pollutants.

Green synthesis of mixed metallic nanoparticles using room temperature self-assembly

2017 ◽  
Vol 13 (2) ◽  
pp. 4671-4677 ◽  
Author(s):  
A. M. Abdelghany ◽  
A.H. Oraby ◽  
Awatif A Hindi ◽  
Doaa M El-Nagar ◽  
Fathia S Alhakami
Keyword(s):  
Self Assembly ◽  
Metallic Nanoparticles ◽  
Room Temperature ◽  
Bimetallic Nanoparticles ◽  
Reduction Process ◽  
Nano Particles ◽  
Nano Structure ◽  
Small Shift ◽  
Molar Ratios ◽  
Vis Spectroscopy

Bimetallic nanoparticles of silver (Ag) and gold (Au) were synthesized at room temperature using Curcumin. Reduction process of silver and gold ions with different molar ratios leads to production of different nanostructures including alloys and core-shells. Produced nanoparticles were characterized simultaneously with FTIR, UV/vis. spectroscopy, transmission electron microscopy (TEM), and Energy-dispersive X-ray (EDAX). UV/vis. optical absorption spectra of as synthesized nanoparticles reveals presence of surface palsmon resonance (SPR) of both silver at (425 nm) and gold at (540 nm) with small shift and broadness of gold band after mixing with resucing and capping agent in natural extract which suggest presence of bimetallic nano structure (Au/Ag). FTIR and EDAX data approve the presence of bimetallic nano structure combined with curcumin extract. TEM micrographs shows that silver and gold can be synthesized separately in the form of nano particles using curcumin extract. Synthesis of gold nano particles in presence of silver effectively enhance and control formation of bi-metallic structure.

Phyto-Facilitated Bimetallic ZnFe2O4 Nanoparticles via Boswellia carteri: Synthesis, Characterization and Anti-Cancer Activity.

2020 ◽  
Vol 21 ◽  
Author(s):  
Amer Imraish ◽  
Afnan Al-Hunaiti ◽  
Tuqa Abu-Thiab ◽  
Abed Al-Qader Ibrahim ◽  
Eman Hwaitat ◽  
...  
Keyword(s):  
Anticancer Activity ◽  
Cell Lines ◽  
Metallic Nanoparticles ◽  
Bimetallic Nanoparticles ◽  
Iron Chloride ◽  
Nano Particles ◽  
Adverse Side Effect ◽  
Wide Range ◽  
Anti Cancer ◽  
Znfe2o4 Nanoparticles

Background: The growing unsatisfaction toward the available traditional chemotherapeutic agents enhanced the need to develop new methods for obtaining materials with more effective and safe anti-cancer properties. Over the past few years, usage of metallic nanoparticles has been a target for researchers of different scientific and commercial fields due to their tiny sizes, environment friendly properties and wide range applications. To overcome the obstacles of traditional physical and chemical methods for synthesis of such nanoparticles, a new less expensive and eco-friendly method has been adopted using natural existing organisms as a reducing agent to mediate synthesis of the desired metallic nanoparticles from their precursors, a process called green biosynthesis of nanoparticles. Objective: Here in the present study, zinc iron bimetallic nanoparticles (ZnFe2O4) were synthesized via an aqueous extract of Boswellia Carteri resin mixed with zinc acetate and iron chloride precursors, and they were tested for their anticancer activity. Methods: Various analytic methods were applied for the characterization of the Phyto synthesized ZnFe2O4 and they were tested for their anticancer activity against MDA-MB-231, K562, MCF-7 cancer cell lines and normal fibroblasts. Results: Our results demonstrate the synthesis of cubic structured bimetallic nanoparticles ZnFe2O4 with an average diameter 10.54 nm. MTT cytotoxicity assay demonstrate that our phyto-synthesized ZnFe2O4 nanoparticles exhibited a selective and potent anticancer activity against K562 and MDA-MB-231 cell lines with IC50 values 4.53 µM and 4.19 µM, respectively. Conclusion: In conclusion, our bio synthesized ZnFe2O4 nano particles show a promising environmentally friendly of low coast chemotherapeutic approach against selective cancers with a predicted low adverse side effect toward normal cells. Further in vivo advanced animal research should be done to execute their applicability in living organisms.

Photo-catalytic Study of Malachite Green Dye Degradation Using Rice Straw Extracted Activated Carbon Supported ZnO Nano-particles

2020 ◽  
Vol 10 (6) ◽  
pp. 849-859
Author(s):  
Radwa A. El-Salamony ◽  
Abeer A. Emam ◽  
Nagwa A. Badawy ◽  
Sara F. El-Morsi
Keyword(s):  
Activated Carbon ◽  
Visible Light ◽  
Rice Straw ◽  
Malachite Green ◽  
Dye Degradation ◽  
Nano Particles ◽  
Oh Radicals ◽  
Impregnation Method ◽  
Photo Degradation ◽  
Malachite Green Dye

Objective: ZnO nanoparticles were synthesized using wet impregnation method, and activated carbon from rice straw (RS) prepared through chemical route. Methods: The nano-composites ZnO-AC series were prepared with different ZnO:AC ratio of 10, 20, 50, and 70% to optimize the zinc oxide nanoparticles used. The obtained composites were characterized by FE-SEM, XRD, SBET, and optical techniques then used for the photo-degradation of Malachite green dye (MG) under visible light. Results: It was found that 10ZnO-AC exhibited excellent visible light photo-catalytic performance. The ·OH radicals’ formation is matching with photo-activity of the prepared composites. The photo-degradation efficiency of MG increased from 63% to 93%, when the 10ZnO-AC photocatalyst amount was increased from 0.5 to 6 g/L. Conclusion: The GC-MS technique was used to analyze the intermediates formed; up to 15 kinds of chemicals were identified as the degradation products.

scholarly journals Effect of calcination temperature on the properties and applications of bio extract mediated titania nano particles

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
N. Saikumari ◽  
S. Monish Dev ◽  
S. Avinaash Dev
Keyword(s):  
Electron Microscopy ◽  
Calcination Temperature ◽  
Surface Properties ◽  
Economic Feasibility ◽  
Nano Particles ◽  
Textile Dye ◽  
Gravimetric Analysis ◽  
Anatase Titania ◽  
Nano Catalyst ◽  
Bet Analysis

AbstractIn order to deal with the arising environmental issues across the globe at present nano particles with unique properties laid a benchmark in the name of nano catalysis. In this work the significance of calcination temperature on the thermal, electronic, structural and surface properties of a nano catalyst produced by sol–gel method using ultrasonic radiation against the disposal of toxic textile pollutants is studied in detail. The extract of tea leaves has been used as a bio-template during the synthesis to revise the crystallite size, surface area, optical absorption potential, and rate of agglomeration of nano sized grains by regulating their physico-chemical and surface properties. The influence of calcination in the transformation of single phased anatase titania to mixed phase anatase–rutile titania and the corresponding outcome in its photocatalytic activity employed in water treatment applications have been verified. The nano catalyst obtained is characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transition electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), Thermo gravimetric analysis (TGA), Brunaueur Emmett Teller (BET) analysis, UV–Vis diffused reflectance spectroscopy (DRS-UV–Vis) etc. The mesoporosity of the particle was examined using Barrett Joyner Halenda (BJH) model. The enhanced photo catalytic efficiency (about 97.7%) of templated nano titania due to calcination is verified against Congo red, a textile dye under optimized conditions. The nano catalyst produced can be easily separated, recycled to support its economic feasibility.

Sign in / Sign up

Export Citation Format

Share Document