Recyclable Fe3O4/Au Nanocomposites for Oxidation Degradation of Methylene Blue in Near Neutral Solution

NANO ◽  
2019 ◽  
Vol 14 (10) ◽  
pp. 1950122
Author(s):  
Yan Xing ◽  
Xiao-Hui Bai ◽  
Ming-Li Peng ◽  
Xiang-Rong Ma ◽  
Norbert Buske ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Catalytic Activity ◽  
Rate Constant ◽  
Nanocrystalline Structure ◽  
Neutral Solution ◽  
Au Nps ◽  
Transmission Electron ◽  
Interaction Interface ◽  
Growth Method

Fe3O4/Au nanocomopsites (Fe3O4/Au NPs) with much improved catalytic activity were successfully fabricated through a simple seed growth method in aqueous solution. The petal-like structure, high saturation magnetization, the negatively charged sodium citrate-stabilized Fe3O4/Au NPs was characterized by transmission electron microscopy (TEM), X-ray diffractometer (XRD), dynamic light scattering (DLS) and vibrating sample magnetometry (VSM). The activated-H2O2 ability of Fe3O4/Au NPs was evaluated by using methylene blue (MB) as a cationic phenothiazines dye to be degraded in near neutral solution. The results showed Fe3O4/Au NPs removed over 95% MB from an aqueous solution within 60[Formula: see text]min under the optimum conditions. The apparent rate constant of Fe3O4/Au NPs was [Formula: see text][Formula: see text]min[Formula: see text] which was 43.2 and 8.3 times higher than pure Fe3O4 ([Formula: see text][Formula: see text]min[Formula: see text] and Au ([Formula: see text][Formula: see text]min[Formula: see text] NPs. The enhanced catalytic activity and increased oxidation rate constant probably owing to the synergistic effect between Fe3O4 and Au NPs to activate H2O2 generate a large amount of strong oxidizing species, such as [Formula: see text]. In addition, nanocrystalline structure of Fe3O4/Au NPs was also very important to the peroxidase-like effect, especially the interaction interface between Fe3O4 and Au NPs. Moreover, Fe3O4/Au NPs was stable and could be regenerated and reused for at least five cycles.

scholarly journals Synthesis of Polyaniline coated Graphene Oxide @ SrTiO3 Nanocube Nanocomposites for Enhanced Removal of Carcinogenic Dyes from Aqueous Solution

2016 ◽  
Author(s):  
Syed Shahabuddin ◽  
Norazilawati Muhamad Sarih ◽  
Muhammad Afzal Kamboh ◽  
Hamid Rashidi Nodeh ◽  
Sharifah Mohamad
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Methylene Blue ◽  
Graphene Oxide ◽  
Methyl Orange ◽  
Oxidative Polymerization ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Polymerization Method

The present investigation highlights the synthesis of polyaniline (PANI) coated graphene oxide doped with SrTiO3 nanocube nanocomposites through facile in-situ oxidative polymerization method for the efficient removal of carcinogenic dyes, namely, the cationic dye methylene blue (MB) and the anionic dye methyl orange (MO). The synthesised nanocomposites were characterised by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The adsorption efficiencies of graphene oxide (GO), PANI homopolymer and SrTiO3 nanocubes-doped nanocomposites were assessed by monitoring the adsorption of methylene blue and methyl orange dyes from aqueous solution. The adsorption efficiency of nanocomposites doped with SrTiO3 nanocubes were found to be of higher magnitude as compared with undoped nanocomposite. Moreover, the nanocomposite with 2 wt% SrTiO3 with respect to graphene oxide demonstrated excellent adsorption behaviour with 99% and 91% removal of MB and MO respectively, in a very short duration of time.

scholarly journals Investigating Methylene Blue Removal from Aqueous Solution by Cysteine-Functionalized Mesoporous Silica

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Abeer M. Beagan
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Methylene Blue ◽  
Mesoporous Silica ◽  
Mesoporous Silica Nanoparticles ◽  
Influential Factors ◽  
Functionalized Mesoporous Silica ◽  
Transmission Electron ◽  
Pseudo Second Order ◽  
The Stöber Method

In this study, mesoporous silica nanoparticles (MSNs) were synthesised using the Stober method and functionalised with cysteine (MSN-Cys) for removal of Methylene Blue (MB) from aqueous solution using the batch method. The adsorbent nanoparticles were characterised by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), FTIR, BET, and TGA. Several influential factors on the adsorption of MB onto the surface of MSN-Cys particles were investigated, including pH, initial concentration, and contact time. The adsorption capacity of MB from aqueous solution increased from circa 70 mg/g MSN-Cys in acidic media to circa 140 mg/g MSN-Cys in basic media. Adsorption isotherms and kinetic models of adsorption were used to clarify the adsorption process. The measured adsorption isotherm was fitted with a Freundlich model for all solutions, and the kinetic model was determined to be pseudo-second-order.

Investigation of ZnO/CuO/Nanographene Platelets Composites Catalyst for the Degradation of Methylene Blue from Aqueous Solution

2016 ◽  
Vol 864 ◽  
pp. 117-122 ◽  
Author(s):  
Hesni Shabrany ◽  
Hendry Tju ◽  
Ardiansyah Taufik ◽  
Rosari Saleh
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Catalytic Activity ◽  
Visible Light ◽  
Sol Gel ◽  
Nitrogen Adsorption ◽  
Ultrasound Irradiation ◽  
X Ray Diffraction ◽  
X Ray

This paper discusses the catalytic activity of ZnO/CuO/nanographene platelets composites under visible light and ultrasound irradiation separately. The ZnO/CuO/nanographene platelets composites were synthesized using a sol-gel method. X-ray diffraction and nitrogen adsorption spectroscopy were employed to investigate the structural and surface area of the catalyst. The catalytic activity results showed that the presence of nanographene platelets in ZnO/CuO nanocomposites improved its efficiency in degrading methylene blue. A scavenger method was also used to understand the role of charged carriers and the active radical involved in the catalytic activity.

Enhanced Photocatalytic Degradation of Methylene Blue by Using Au-TiO2

2019 ◽  
Vol 886 ◽  
pp. 107-113
Author(s):  
Pongthep Jansanthea ◽  
Weerasak Chomkitichai
Keyword(s):  
Methylene Blue ◽  
Average Crystallite Size ◽  
Average Diameter ◽  
Single Step ◽  
Flame Spray ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Au Nps ◽  
Transmission Electron ◽  
Excellent Photocatalytic Activity

In this work, Au-TiO2 nanoparticles (NPs) were synthesized in a single step by flame spray pyrolysis (FSP) method. X-ray diffraction (XRD) results indicated that phase structures of all samples TiO2 were the mixture of anatase and rutile phases. High resolution transmission electron microscopy (HRTEM) showed that dark spots of Au NPs deposited on larger TiO2 nanoparticles. HRTEM results indicated TiO2 NPs were average crystallite size in the range of 10–30 nm whereas the average diameter of Au NPs was about 5–10 nm. UV–Vis absorption spectroscopy technique showed peaks attributable of surface plasmon resonance (SPR) to Au NPs loaded on TiO2 in the wavelength of 500–630 nm. The Au-TiO2 NPs showed excellent photocatalytic activity for the degradation of methylene blue (MB) under UV-Vis irradiation. It was found that 0.25 mol% Au-TiO2 which was a better photocatalyst than others under the same reaction conditions. The results showed that Au NPs-loading could effectively improve the photocatalytic activities of TiO2.

Investigation of Au Nanoparticles Loading Temperature Responsive Hybrid Microgels

2013 ◽  
Vol 650 ◽  
pp. 268-272
Author(s):  
Chen Lu ◽  
Xiao Yun Liu ◽  
Liu Sheng Zha
Keyword(s):  
Reaction Times ◽  
Average Diameter ◽  
Localized Surface Plasmon ◽  
Au Nps ◽  
Temperature Responsive ◽  
Weight Content ◽  
Transmission Electron ◽  
Seed Growth ◽  
Growth Method ◽  
Hybrid Microgels

Gold nanoparticles (Au NPs) were loaded into poly(N-isopropylacrylamide) based temperature responsive microgels by seed-growth method. Their growth process was tracked by their extinction spectra at various reaction times. Their average diameter measured by field emission transmission electron microscopy is 12 nm, and their weight content by thermogravimetric analysis is 29.2%. The localized surface plasmon resonance (LSPR) property of the loaded Au NPs changes remarkably within the same temperature range as the particle size of the hybrid microgels varys, due to variation of the refractive index surrounding the Au NPs and plasmonic coupling between them. This result indicates that the LSPR property of the Au NPs embedded within temperature responsive microgels can be tuned by environmental temperature.

scholarly journals Facile Synthesis of High Performance Iron Oxide/Carbon Nanocatalysts Derived from the Calcination of Ferrocenium for the Decomposition of Methylene Blue

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 948 ◽  
Author(s):  
Thinnaphat Poonsawat ◽  
Thanyaphat Techalertmanee ◽  
Peerapong Chumkaeo ◽  
Isti Yunita ◽  
Titiya Meechai ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Catalytic Activity ◽  
Iron Oxide ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Significant Loss ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Highly Active ◽  
Transmission Electron

Iron oxide/carbon nanocatalysts were successfully synthesized by the calcination of ferrocenium at high temperatures ranging from 500 to 900 °C. Then the synthesized nanocomposites were characterized by XRD (X-Ray Diffraction), TEM (Transmission Electron Microscopy), VSM (Vibrating-Sample Magnetometry), BET (Brunauer-Emmett-Teller surface area measurements), TGA (Thermogravimetric Analysis), XPS (X-Ray Photoelectron Spectroscopy), EPR (Electron Paramagnetic Resonance), and CHN elemental analysis. The prepared nanocatalysts were applied for the decomposition of methylene blue as a model in wastewater treatment. It was unexpected to discover that the prepared nanocatalysts were highly active for the reaction with methylene blue in the dark even though no excess of hydrogen peroxide was added. The nanocatalyst calcined at 800 °C exhibited the rod shape with the best catalytic activity. The nanocatalysts could be reused for 12 times without the significant loss of the catalytic activity.

Degradation of Methylene Blue by Fenton-Like Reaction

2014 ◽  
Vol 1065-1069 ◽  
pp. 3127-3130 ◽  
Author(s):  
Gang Chao Zhu ◽  
Jian Xin Shou ◽  
Jia Wei Qian ◽  
Hua Zheng Xin ◽  
Mu Qing Qiu
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Catalytic Activity ◽  
Optimal Condition ◽  
Influencing Factors ◽  
Catalyst Concentration ◽  
Degradation Efficiency ◽  
Heterogeneous Fenton

In order to enhance the catalytic activity of the heterogeneous Fenton-like reaction, the catalyst of Fe3O4 composites was synthesized. The Fe3O4 was used as catalyst of the heterogeneous Fenton-like reaction to degrade methylene blue in aqueous solution. The influencing factors, such as pH, initial H2O2 concentration, dye concentration and catalyst concentration, were investigated. The results showed that the dye was effectively degraded at pH 3-8. The optimal condition was at pH3.5. The degradation efficiency of dye increased with the increase of the initial H2O2 concentration and reached maximum when the H2O2 concentration was 15 mmol/L. The degradation efficiency of dye increased with the catalyst concentration was 650 mg/L. The coexisted anions decreased the degradation efficiency of dye.

scholarly journals Comparison of methylene blue adsorption from aqueous solution using spent tea dust and raw coir pith

2013 ◽  
Vol 16 (1) ◽  
pp. 146-159 ◽  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Rate Constant ◽  
Low Cost ◽  
Order Rate Constant ◽  
Solution Ph ◽  
Coir Pith ◽  
Adsorption Capacities ◽  
Pseudo Second Order ◽  
Diffusion Rate Constant

<div> <p>The purpose of the present work is to test the possibility of using the spent tea dust and raw coir pith for the removal of methylene blue (MB) from aqueous solution. The effects of the contact time, adsorbent dosage and solution pH were studied in batch experiments at 27 &deg;C. Results showed that a pH of 7 is favourable for the adsorption of dye. The isothermal data could be well described by the Langmuir equations. Kinetic parameters of adsorption such as the Langergen pseudo-first-order, pseudo-second-order rate constant and the intraparticle diffusion rate constant were determined. The adsorption capacities of Spent Tea Dust (STD) and Raw Coir Pith (RCP) were found to be 86.21 mg and 142.86 mg g<sup>-1</sup> of the adsorbent respectively. The results indicate that STD and RCP could be employed as low-cost alternatives to commercial activated carbon for the removal of dyes from aqueous solution.</p> </div> <p>&nbsp;</p>

Synthesis of noval gold nanomaterials and it's detection of sewage

2019 ◽  
Vol 14 (2) ◽  
pp. 365-370
Author(s):  
Furong Nie ◽  
Jun Ai
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Gold Nanoparticles ◽  
Pore Structure ◽  
Adsorption Experiment ◽  
Au Nps ◽  
Fluorescent Signal ◽  
Novel Approach ◽  
Gold Nanomaterials ◽  
First Time

Abstract In this article we report a novel approach to polyvinyl pyrrolidone k-30 (PVP)-templated formation of fluorescent gold nanoparticles (Au NPs) with pore structure and its application to sewage detection. For the first time the method of generating PVP-encapsulated Au NPs in aqueous solution is demonstrated. It was found that the formation of fluorescent Au NPs have highly fluorescent signal. Through the adsorption experiment, it is concluded that the methylene blue is adsorbed on Au NPs. This work successfully develops the capping PVP scaffolds of fluorescent Au NPs with pore structure. This experiment lays a foundation for the application of Au NPs in the field of environmental applications.

scholarly journals Porous Wood Decorated with Gold Nanoparticles as Flow-through Membrane Reactor for Catalytic Hydrogenation of Methylene Blue and 4-Nitrophenol

2021 ◽  
Author(s):  
Yuanyuan Yu ◽  
Qingtong Zhang ◽  
Mingchao Chi ◽  
Hongrui Jiang ◽  
Xi Liu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Catalytic Hydrogenation ◽  
Organic Contaminants ◽  
Low Cost ◽  
Three Dimensional ◽  
Wood Chip ◽  
Flow Process ◽  
Au Nps

Abstract In this study, gold nanoparticles (Au NPs) were decorated into Paulownia Sieb. et Zucc. chip. Lignin, as one main component of wood, contains the reducing groups e.g. hydroxyl, carbonyl and aldehyde groups. Under sunlight irradiation, Au (III) diffused into wood was in situ reduced by lignin to form gold nanoparticles. Therefore, the Au NPs/Wood was successfully fabricated by this facile and green procedure. Meanwhile, the three-dimensional interpenetrating network of wood prevented the aggregation of Au NPs which retained its catalytic activity. Methylene blue and 4-nitrophenol were adopted as model organic contaminants to evaluate the catalytic hydrogenation ability of the Au NPs/Wood. The analyses of XRD, SEM, ICP-MS and XPS indicated that Au NPs were successfully immobilized in wood chip. The degradation results revealed that the Au NPs/Wood has excellent catalytic activity for methylene blue and 4-nitrophenol hydrogenation under batchwise and continuous flow process. Meanwhile, the Au NPs/Wood also exhibited excellent recyclability. The hydrogenation efficiency of MB and 4-NP still reaches more than 90% after 8 cycles. This study provides a new solution for green and low-cost fabrication of Au NPs/Wood which has broad application prospects in wastewater treatment.

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