2024-03-29T09:20:03Z
https://www.jwent.net/?_action=export&rf=summon&issue=5842
Journal of Water and Environmental Nanotechnology
J Water Environ Nanotechnol
2476-7204
2476-7204
2019
4
3
Efficient synthesis of magnetically separable CoFe2O4@SiO2 nanoparticles and its potent catalytic applications for the synthesis of 5-aryl-1,2,4-triazolidine-3-thione derivatives
Shreyas
Pansambal
Suresh
Ghotekar
Sunil
Shewale
Keshav
Deshmukh
Nilesh
Barde
Pranav
Bardapurkar
Magnetically separable silica-coated cobalt ferrite (CoFe2O4@SiO2) magnetic nanoparticles (MNPs) were synthesized by sol-gel auto combustion method. Silica matrix was employed to minimize the agglomeration and coarsening of the MNPs. The structural and morphological properties of the as-prepared nanocatalyst were investigated using XRD, EDX, TEM-SAED, FTIR, XPS and VSM techniques. Furthermore, these nanoparticles were used as an efficient nanocatalyst for simple, swift and one-pot synthesis of 5-aryl-1,2,4-triazolidine-3-thione derivatives. The reaction steps include imine formation, cyclization, condensation and aromatization without use of any oxidizing or reducing reagents. The present methodology offers remarkable merits like shorter reaction time, mild reaction conditions, excellent yield, simplicity, safer reaction pathway, easy workup and recyclable catalyst without any significant loss in catalytic activity and can be used for large scale synthesis. Hence, the present study describing the synthesis of CoFe2O4@SiO2 nanoparticles by efficient sol-gel auto combustion method followed by the investigation of potent catalytic activities may be useful for nanochemistry research opening a new arena in this field.
Magnetic nanoparticles
CoFe2O4@SiO2
nanocatalyst
Recyclable catalyst
Magnetic separation
2019
07
01
174
186
https://www.jwent.net/article_36844_2783e26900b2aff605db04e186f55c5b.pdf
Journal of Water and Environmental Nanotechnology
J Water Environ Nanotechnol
2476-7204
2476-7204
2019
4
3
Photocatalytic Removal of Food Colorant E 131 VF from synthetic wastewater by Cu Doped TiO2 Samples
Malak Ali
El Tfayli
Fatima
Ali Makki
Mounir
Mustapha Kassir
Mouhiaddine Mohamed
El Jamal
Azadeh
Ebrahimian Pirbazari
In this work, we studied the effect of various amounts (0.2-1.2 % mole ratio) of Cu doping to TiO2 nanoparticles (Cu/TiO2) on the photocatalytic removal efficiency of the food colorant E 131 VF. Two series of doped TiO2 (P25) photocatalysts were prepared in two different media (50%ethanol-50%acetone and 5% surfactant (Tween 20)-95%H2O) by using the impregnation method. The prepared samples were characterized by XRD, FTIR, Raman, diffuse reflectance spectroscopy and SEM/EDX analyses. The XRD results showed that the crystal dimension of TiO2 increased from 23 to 35 nm and rutile/anatase ratio decreased from 16% to 9% after Cu doping in two different media. The photoactivity of TiO2 was reduced in the presence of Cu even at low molar ratio. The photocatalytic degradation rate constant of TiO2 (P25) was 0.24 (au) but it decreased to 0.015 (au) in the presence of the sample containing 0.6% Cu. Several reasons were suggested to explain the dramatic decrease in the activity of the prepared Cu/TiO2samples.
Cu/ TiO2
Photocatalytic removal
surfactant
E 131 VF dye
Kinetics study
2019
07
01
187
197
https://www.jwent.net/article_36845_96a149d5b108dd377af282523867bcb9.pdf
Journal of Water and Environmental Nanotechnology
J Water Environ Nanotechnol
2476-7204
2476-7204
2019
4
3
Synthesis of TiO2/Fe3O4/MWCNT Magnetic and Reusable Nanocomposite with High Photocatalytic Performance in the Removal of Colored Combinations from Water
Ahmad
Vakili Tajareh
Hossein
Ganjidoust
Bita
Ayati
In this study, TiO2/Fe3O4 and TiO2/Fe3O4/MWCNT as a new magnetic nanophotocatalytic materials were synthesized. For this, TiO2 nanoparticle were fixed on an inert surface by sonochemical method. X-ray Diffraction (XRD), scanning electron microscopy (SEM), UV-Vis diffuse reflectance spectroscopy (DRS), vibration sample magnetometry (VSM) were used to characterize the magnetic nanocomposites. SEM analysis indicated that TiO2 and Fe3O4 nanoparticles were adhered to MWCNT. Ability of the nanocomposites to remove organic pollutants were investigated by photodegradation of Acid Red 14, Acid Blue 19, Reactive Red 77, and Methyl Orange dyes simulated conditions similar to sunlight. Furthermore, the removal efficiency of AR14 were investigated under direct sunlight irradiation, with an initial concentration of 50 mg/L by TiO2, TiO2/Fe3O4 and TiO2/Fe3O4/MWCNT nanocatalysts were 89.83, 21.19 and 86.27, respectively. According to the results, addition of carbon nanotubes to the TiO2/Fe3O4 magnetic nanocomposite, increased the efficiency of AR14 photodegradtion through change in energy gap visible waves and the scavenging role of carbon nanotubes. Also, The reusability of nanocomposites was assessed in five consecutive cycles of 6 hours, The results showed that after 5 cycles the degradation rate decreased only 7.79 %.
magnetic nanocomposite
Photocatalytic
Xenon light
TiO2/Fe3O4/MWCNT
Water treatment
2019
07
01
198
212
https://www.jwent.net/article_36846_8f6bc52543a9b2a0aac469adea2b0bed.pdf
Journal of Water and Environmental Nanotechnology
J Water Environ Nanotechnol
2476-7204
2476-7204
2019
4
3
Polysulfone nanocomposite membrane embedded by silanized nanodiamond for removal of humic acid from water
Atefeh
Tizchang
Yoones
Jafarzadeh
Reza
Yegani
Elham
Shokri
In this study, polysulfone (PSf) nanocomposite membranes embedded with functionalized nanodiamond (ND) were prepared via Non-Solvent Induced Phase Separation (NIPS) method. ND nanoparticles were silanized by using the esterification reaction of hydrolyzed vinyltrimethoxysilane (VTS) in alcoholic solution in order to enhance the compatibility between ND and PSf. Fourier Transform Infrared Spectroscopy (FTIR) analysis revealed that ND nanoparticles were successfully functionalized by silane groups. Nanocomposite membranes were then prepared with different percentages of silanized NDs (SNDs). The membranes were characterized using a set of analyses and the results showed that the addition of SNDs up to 1.0 wt.% resulted in an increase in hydrophilicity, water content, porosity and water flux of membranes. Moreover, Scanning Electron Microscopy (SEM) images indicated that the membrane with 1.0 wt. % nanoparticles had more pores on the membrane surface with smaller average pore size in comparison to other membranes. Antifouling properties of the membrane was also investigated in filtration of humic acid solution and the results showed that reversible fouling and flux recovery of membranes increased at the presence of SNDs.
Polysulfone
Functionalization
Nanodiamond
Fouling
Nanocomposite
2019
07
01
213
226
https://www.jwent.net/article_36847_da9eee9b22024f56a0d3c4b5e8273acf.pdf
Journal of Water and Environmental Nanotechnology
J Water Environ Nanotechnol
2476-7204
2476-7204
2019
4
3
Ultrasound assisted electro-Fenton process including Fe-ZSM-5 nanocatalyst for degradation of Phenazopyridine
Mohammad
Rostamizadeh
Soorena
Gharibian
Samira
Rahimi
Pharmaceutical wastewaters have several negative effects on human health. This study reports heterogeneous and ultrasound assisted electro Fenton (HSEF) for efficient degradation of Phenazopyridine (PHP). The high silica zeolite socony mobil–5 (ZSM-5) nanocatalyst is synthesized by hydrothermal technique and impregnated with iron species (0.1Fe-ZSM-5). The surface and textural properties of the synthesized nanocatalyst were characterized by X-ray Diffraction (XRD), Transmission electron Microscopy (TEM) and N2 adsorption-desorption techniques. The nanocatalyst includes the high crystallinity (ca. 72.41 %), surface area (ca. 294.40 m2g-1) and uniform dispersion of Fe species. The optimum operating conditions of the HSEF system are pH= 7, applied current of 100 mA, 0.1Fe-ZSM-5 nanocatalyst concentration of 0.2 gL-1 and ultrasonic power of 600 WL-1 which result in the highest PHP removal efficiency. The high performance of the developed nanocatalyst in three consecutive runs confirms the reusability of the nanocatalyst. The results show that the HSEF system has a high capacity for the efficient removal of PHP without requiring long reaction time, high applied current and strict acidic conditions which candidates it for the industrial applications.
Electro Fenton
Ultrasound
heterogeneous
Zeolite nanocatalyst
Phenazopyridine
2019
07
01
227
235
https://www.jwent.net/article_36848_2d4f07ab892c1d04f43b40c6d6d37692.pdf
Journal of Water and Environmental Nanotechnology
J Water Environ Nanotechnol
2476-7204
2476-7204
2019
4
3
Removing Sodium Dodecyl Benzene Sulfonate Using a Hybrid Electrocoagulation/Flotation and Photocatalytic System
Mahta
Nazari
Bita
Ayati
This study was conducted to evaluate sodium dodecyl benzene sulfonate removal using electrocoagulation/flotation and photocatalytic nano-TiO2 slurry systems. The parameters which are effective on the surfactant removal were investigated and optimized. Electrocoagulation/flotation system included meshed and mono-polar stainless steel electrodes which installed horizontally. According to the results, after 60 minutes in pH of 8, electrodes distance of 1 cm, initial SDBS concentration of 750 mg/L, SDBS and COD removal rates were achieved to 93.54 and 90%, respectively. In photocatalytic system, during 48 h, SDBS and COD removed 98.7 and 95%, respectively, while pH was around 8, initial concentration of SDBS was 300 mg/L and nano-TiO2 particles concentration was 0.5 mg/L. In the hybrid system, after 12 minutes, SDBS concentration reached to 329 mg/L which entered to the photocatalytic system that resulted in SDBS and COD removal efficiency of 99 and 96.27%, respectively. Compared to the single systems, by using the hybrid system, the removal efficiencies were improved.
Detergent
Anionic surfactant
electrocoagulation/flotation
anode dissolution
TiO2
2019
07
01
236
243
https://www.jwent.net/article_36849_8fb0ec817562251a2098f487e68ef1f3.pdf
Journal of Water and Environmental Nanotechnology
J Water Environ Nanotechnol
2476-7204
2476-7204
2019
4
3
Preparation a multi-walled carbon nanotubes-carbon paste electrode based on a sulfanyl phenyl Schiff’s base for selective determination of mercury(II) in environmental water samples
Kamal
Alizadeh
Ziba
Yaghouby
Azim
Shams
The electrochemical property of a recently synthesized ligand, 3-((3-mercaptophenyl) aminomethyl)benzene-1,2-diol has been investigated with construction of a modified carbon paste electrode to find out of mercury ions in real samples. To modify the electrode, paraffin oil and multi-walled carbon nanotubes (MWCNT) were used as binder and modifier respectively. Under the optimized conditions, the electrode exhibits a Nernstian slope of 30.0±0.2 mV per decade for mercury(II) ions over a broad concentration range 1×10-7 to 1×10-1M with a R2 value of 0.996 at pH 4.5 in a 5 sec response time. The detection limit of the method for Hg2+ was 2.3×10−8 mol l−1. The influence of several potentially interfering ions such as K+, Ag+, Cd2+, Ni2+, Ca2+, Cr3+, Pb2+, Cu2+, Co2+, Mg2+, Fe2+, Al3+, La3+ and Fe3+ on the determination of Hg2+ was studied and no significant interference was observed. The proposed modified carbon paste electrode was successfully applied to the determination of mercury ions in real water samples.
Hg-selective electrode
Modified carbon paste
Potentiometry
MWCNT
Sulfanyl phenyl derivative
2019
07
01
244
250
https://www.jwent.net/article_36850_fe0a4f75cb5c46a9fe20bd88ef6dfc2b.pdf
Journal of Water and Environmental Nanotechnology
J Water Environ Nanotechnol
2476-7204
2476-7204
2019
4
3
Photocatalytic degradation of methylene blue using ZnO and 2%Fe-ZnO semiconductor nanomaterials synthesized by sol-gel method: A comparative study
Kalpesh
Isai
Vinod
Shrivastava
ZnO and 2%Fe-ZnO nanomaterials were prepared by using a low-cost sol-gel method. The synthesized nanomaterials were characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDX). The XRD and SEM studies reveal that the synthesized nanomaterials have a hexagonal wurtzite structure with average crystalline size ~ 22-23 nm. EDX analysis confirmed the composition and purity of synthesized nanomaterial. The photocatalytic activity of synthesized nanomaterials was monitored using the spectrophotometric method. Also, the photocatalytic removal of methylene blue (MB) dye from its aqueous solution by using ZnO and 2%Fe-ZnO nanopowder under UV light irradiation was studied. The effect of various parameters such as pH of dye solution, dye concentration, contact time and catalyst dose were investigated. Results of the current study demonstrated that, the maximum degradation using ZnO was 86 % and that for 2%Fe-ZnO was 92 % (under the optimum condition initial dye concentration=10 mg/L and pH =2). This study showed that 2%Fe-ZnO is a promising and better photocatalysts than ZnO.
Photocatalytic degradation
ZnO
Semiconductor Nanomaterial
Methylene blue
Sol-gel
2019
07
01
251
262
https://www.jwent.net/article_36851_c6200af989c3d83890382550448a8842.pdf