One-pot green synthesis of iron oxide nanoparticles from Bauhinia tomentosa: Characterization and application towards synthesis of 1, 3 diolein

AbstractThe green synthesis of NPs through plant extracts can be a modest, one-pot alternative synthesis to the conventional physical or chemical method. The prime focus of this study is to produce MNPs by the reducing effect of Bauhinia tomentosa leaf extract, and it was immobilized in porcine pancreatic lipase (PPL). Synthesized NPs were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and Raman spectroscopy, UV–Vis Spectrometry, Thermogravimetry, and Differential Scanning Calorimeter (DSC), Zeta potential test, VSM, BET and Fourier Transform Infrared Spectroscopy (FTIR). The effect of process parameters was studied, about the efficiency of immobilization are enzyme stability, the extent of enzyme reusability, its separation from products, the activity of immobilized enzyme, recovery, and its loss. Finally, the immobilized lipase was used for the synthesis of 1,3-diolein using enzyme-mediated esterification of oleic acid and glycerol. Under optimized condition (reaction temp-55 $$^\circ $$ ∘ C; molar ratio-2.5:1; pH-7) diolein yield was achieved to be 94%. Therefore, this work was further used for the industrial production of 1,3-diacylglycerol since a perfect enzyme-catalyzed process was observed.

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Interfacial Synthesis of SiO2 Doped by Polyaniline and its Electrorheological Behavior

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.179-180.249 ◽

2011 ◽

Vol 179-180 ◽

pp. 249-252

Author(s):

Qing Ming Jia ◽

Shao Yun Shan ◽

Li Hong Jiang ◽

Ya Ming Wang

Keyword(s):

Silicone Oil ◽

Synthesis Method ◽

Tetraethyl Orthosilicate ◽

Molar Ratio ◽

X Ray Diffraction ◽

One Pot ◽

X Ray ◽

Sem Image ◽

Interfacial Synthesis ◽

Er Fluid

SiO2 doped by polyaniline for application in electrorheological (ER) ﬂuid was prepared by using a simple one-pot interfacial synthesis method. Scanning electron microscopy (SEM) image shows that the morphologies of SiO2 may be changed from spherical to fibroid structure by changing the molar ratio of tetraethyl orthosilicate(TEOS) and aniline. X-ray diffraction (XRD) proves that polyaniline does not change the crystallinity of SiO2. The ER behaviors of SiO2 doped by polyaniline in silicone oil are investigated with different doping degrees under different shear rate, and the results show that properly doping polyaniline improves electrorheological behavior of SiO2.

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Synthesis of BiVO4/Bi2VO5.5 Heterogeneous Nanostructures with Enhanced Visible Light Photocatalytic Activity

Materials Science Forum ◽

10.4028/www.scientific.net/msf.847.211 ◽

2016 ◽

Vol 847 ◽

pp. 211-217

Author(s):

Jian Min Wang ◽

Feng Cao ◽

Xin Lv ◽

Song Li ◽

Jia Jia Cai ◽

...

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Separation Efficiency ◽

Molar Ratio ◽

X Ray Diffraction ◽

One Pot ◽

X Ray ◽

Visible Light Photocatalytic Activity ◽

Visible Light Driven ◽

Visible Light Photocatalytic

BiVO4/Bi2VO5.5 heterogeneous nanostructures with enhanced visible light photocatalytic activity were successfully prepared by a facile one-pot solvothermal method, where diethylene glycol (DEG) was used as the solvent. The as-prepared products were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectrometry (XPS) and UV-Vis absorption spectroscopy. The results revealed that the molar ratio of Bi3+ to VO43- played an important role in the formation of crystal and morphology. These BiVO4/Bi2VO5.5 heterogeneous nanostructures exhibited higher visible-light-driven photocatalytic efficiency compared to the pure BiVO4 and Bi2VO5.5. For the methyl orange (MO) degradation efficiency of BiVO4/Bi2VO5.5 heterogeneous nanostructures under visible light irradiation, about 95% of MO was degraded within 40min, which is much higher than pure BiVO4 and Bi2VO5.5. The enhancement of photocatalytic activity can attribute to the promoted light absorption capability and the separation efficiency of photo-generated electron-hole pairs.

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Synthesis, Structures and Magnetism of Mn(II)-Gd(III) Mixed-metal Complexes of 2,6-Dipicolinoylbis (N,N-diethylthiourea)

VNU Journal of Science Natural Sciences and Technology ◽

10.25073/2588-1140/vnunst.4993 ◽

2020 ◽

Vol 36 (2) ◽

Author(s):

Pham Chien Thang ◽

Nguyen Thu Ha ◽

Nguyen Hung Huy

Keyword(s):

Magnetic Properties ◽

Organic Ligand ◽

Magnetic Interaction ◽

Molar Ratio ◽

X Ray Diffraction ◽

One Pot ◽

X Ray ◽

Mixed Metal ◽

Mixed Metal Complexes ◽

Dianionic Ligands

A novel Mn(II)-Gd(III) mixed-metal complex has been synthesized by one-pot reaction in methanolic solution of GdCl3, Mn(CH3OO)2∙4H2O and the organic ligand 2,6-dipicolinoylbis(N,N-diethylthiourea) (H2L) with 1:2:3 molar ratio. The structure of the complex was elucidated by IR spectroscopy, and single crystal X-ray diffraction, while the magnetic properties were studied by SQUID measurements in the temperature range of 10 ÷ 330 K. The complex is comprised of one Gd3+ ion, two Mn2+ cations, and three dianionic ligands {L}2- with the chemical composition of [GdMn2(L)3](PF6). The magnetic interaction between Mn(II) and Gd(III) is weakly ferromagnetic with J = + 0,027 cm-1.

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One-Pot Synthesis of Bi/Fe3O4 and Its Catalytic Performances for 4-Nitrophenol Reduction

BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS ◽

10.9767/bcrec.12.1.621.89-95 ◽

2017 ◽

Vol 12 (1) ◽

pp. 89 ◽

Cited By ~ 5

Author(s):

Ke-ying Cai ◽

Yu-Sheng Liu ◽

Yang Xu ◽

Huimin Zhou ◽

Lingxia Zhang ◽

...

Keyword(s):

Reaction Engineering ◽

Molar Ratio ◽

X Ray Diffraction ◽

One Pot ◽

X Ray ◽

One Pot Synthesis ◽

Novel Approach ◽

Nitrophenol Reduction ◽

Bismuth Chloride ◽

Catalytic Performances

A novel approach was successfully developed for the catalyst Bi-deposited Fe3O4 magnetic nanoparticles, which was used in the degradation of 4-nitrophenol (4-NP). The Bi/Fe3O4 composite was prepared via a one-pot process from ferrous sulfate and bismuth chloride using hydrazine hydrate as a reducing agent. The catalyst was characterized by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. In the composite pure Fe3O4 particles were synthesized and bismuth particles were well dispersed. The catalytic performances were investigated for the reduction of 4-NP with sodium borohydride. The catalyst has higher activity when Bi/Fe molar ratio is 1:4 in the composite and the rate constant k is about 0.611 min-1. The catalyst has good reusability which can be used 10 cycles without obvious deactivation. Furthermore, the catalyst can be easily separated by an external magnetic field. Copyright © 2017 BCREC GROUP. All rights reservedReceived: 11st August 2016; Revised: 20th December 2016; Accepted: 21st December 2016How to Cite: Cai, K.Y., Liu, Y.S., Xu, Y., Zhou, H., Zhang, L., Cui., Y. (2017). One-Pot Synthesis of Bi/Fe3O4 and Its Catalytic Performances for 4-Nitrophenol Reduction. Bulletin of Chemical Reaction Engineering & Catalysis, 12 (1): 89-95 (doi:10.9767/bcrec.12.1.621.89-95)Permalink/DOI: http://dx.doi.org/10.9767/bcrec.12.1.621.89-95

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One-pot Selective Conversion of Biomass-derived Furfural into Cyclopentanone/Cyclopentanol over TiO2 Supported Bimetallic Ni-M (M = Co, Fe) Catalysts

BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS ◽

10.9767/bcrec.15.1.6307.231-241 ◽

2020 ◽

Vol 15 (1) ◽

pp. 231-241 ◽

Cited By ~ 1

Author(s):

Maria Dewi Astuti ◽

Ditya Kristina ◽

Rodiansono Rodiansono ◽

Dwi Rasy Mujiyanti

Keyword(s):

Acid Site ◽

Xrd Analysis ◽

Acid Sites ◽

Molar Ratio ◽

X Ray Diffraction ◽

One Pot ◽

X Ray ◽

Selective Conversion ◽

Temperature Programmed ◽

High Yields

One-pot selective conversion of biomass-derived furfural (FFald) into cyclopentanone (CPO) or cyclopentanol (CPL) using bimetallic nickel-based supported on TiO2 (denoted as Ni-M(3.0)/TiO2; M = Co and Fe; 3.0 is Ni/M molar ratio) have been investigated. Catalysts were synthesized via a hydrothermal method at 150 °C for 24 h, followed by H2 reduction at 450 °C for 1.5 h. X-ray Diffraction (XRD) analysis showed that the formation of Ni-Co alloy phase at 2θ = 44.2° for Ni-Co(3.0)/TiO2 and Ni-Fe alloy at 2θ = 44.1° for Ni-Fe(3.0)/TiO2. The amount of acid sites was measured by using ammonia-temperature programmed desorption (NH3-TPD). Ni-Co(3.0)/TiO2 has three NH3 desorption peaks at 180 °C, 353 °C, and 569 °C with acid site amounts of 1.30 µmol.g-1, 1.0 µmol.g-1, and 2.0 µmol.g-1, respectively. On the other hand, Ni-Fe(3.0)/TiO2 consisted of NH3 desorption peaks at 214 °C and 626 °C with acid site amounts of 3.3 µmol.g-1and 2.0 µmol.g-1, respectively. Both Ni-Co(3.0)/TiO2 and Ni-Fe(3.0)/TiO2 catalysts were found to be active for the selective hydrogenation of FFald to furfuryl alcohol (FFalc) at low temperature of 110 °C, H2 3.0 MPa, 3 h with FFalc selectivity of 81.1% and 82.9%, respectively. High yields of CPO (27.2%) and CPL (41.0%) were achieved upon Ni-Fe(3.0)/TiO2 when the reaction temperature was increased to 170 °C, 3.0 MPa of H2, and a reaction time of 6 h. The yield of CPO+CPL on the reused catalyst decreased slightly after the second reaction run, but the activity was maintained for at least three consecutive runs. Copyright © 2020 BCREC Group. All rights reserved

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Effect of Hydrated Metal Salts on the Coordination Product of Cobalt(II) halide and PNP Type Ligand, 2,6-bis(di-tertbutylphosphinomethyl) pyridine

10.26434/chemrxiv.5851701 ◽

2018 ◽

Author(s):

Tasneem Siddiquee ◽

Abdul Goni

Keyword(s):

Metal Salts ◽

Molar Ratio ◽

Pincer Complexes ◽

Asymmetric Unit ◽

X Ray Diffraction ◽

Pincer Ligand ◽

Tetrahedral Geometry ◽

X Ray ◽

Distorted Tetrahedral Geometry ◽

Cobalt Center

Chemical treatment of CoX2. 6H2O (X = Cl, Br, I) with the potentially tridentate PNP pincer ligand 2,6-bis(di-tert-butylphosphinomethyl)pyridine in 1:1 molar ratio results in cobalt(II) halide-PNP pincer complexes. The effect of the hydrated metal source on molecular structure and geometry of the complexes was studied by single crystal X-ray diffraction analysis. The complexes are neutral and the cobalt center adopts a penta-coordinate system with potential atropisomerization. Within the unit cell there are two distinct molecules per asymmetric unit. One of the two phosphorus atoms in the PNP ligand was observed to be partially oxidized to phosphinoxide. Disorder in the structure reflects a mixture of square pyramidal and distorted tetrahedral geometry.

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Photocatalytic Reduction of CO2 to Methanol Using a Copper-Zirconia Imidazolate Framework

Catalysts ◽

10.3390/catal11030346 ◽

2021 ◽

Vol 11 (3) ◽

pp. 346

Author(s):

Sonam Goyal ◽

Maizatul Shima Shaharun ◽

Ganaga Suriya Jayabal ◽

Chong Fai Kait ◽

Bawadi Abdullah ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Catalyst Support ◽

Oxidation Potential ◽

Molar Ratio ◽

X Ray Diffraction ◽

X Ray ◽

Molar Ratios ◽

Optimum Parameters ◽

Reduction Of Co2 ◽

Enhanced Yield

A set of novel photocatalysts, i.e., copper-zirconia imidazolate (CuZrIm) frameworks, were synthesized using different zirconia molar ratios (i.e., 0.5, 1, and 1.5 mmol). The photoreduction process of CO2 to methanol in a continuous-flow stirred photoreactor at pressure and temperature of 1 atm and 25 °C, respectively, was studied. The physicochemical properties of the synthesized catalysts were studied using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) spectroscopy. The highest methanol activity of 818.59 µmol/L.g was recorded when the CuZrIm1 catalyst with Cu/Zr/Im/NH4OH molar ratio of 2:1:4:2 (mmol/mmol/mmol/M) was employed. The enhanced yield is attributed to the presence of Cu2+ oxidation state and the uniformly dispersed active metals. The response surface methodology (RSM) was used to optimize the reaction parameters. The predicted results agreed well with the experimental ones with the correlation coefficient (R2) of 0.99. The optimization results showed that the highest methanol activity of 1054 µmol/L.g was recorded when the optimum parameters were employed, i.e., stirring rate (540 rpm), intensity of light (275 W/m2) and photocatalyst loading (1.3 g/L). The redox potential value for the CuZrIm1 shows that the reduction potential is −1.70 V and the oxidation potential is +1.28 V for the photoreduction of CO2 to methanol. The current work has established the potential utilization of the imidazolate framework as catalyst support for the photoreduction of CO2 to methanol.

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Green synthesis and characterization of hexaferrite strontium-perovskite strontium photocatalyst nanocomposites

Main Group Metal Chemistry ◽

10.1515/mgmc-2020-0004 ◽

2020 ◽

Vol 43 (1) ◽

pp. 26-42 ◽

Cited By ~ 2

Author(s):

Zahra Hajian Karahroudi ◽

Kambiz Hedayati ◽

Mojtaba Goodarzi

Keyword(s):

Magnetic Properties ◽

Green Synthesis ◽

Sol Gel ◽

Synthesis Method ◽

Combustion Method ◽

Lemon Juice ◽

X Ray Diffraction ◽

X Ray ◽

Auto Combustion

AbstractThis study presents a preparation of SrFe12O19– SrTiO3 nanocomposite synthesis via the green auto-combustion method. At first, SrFe12O19 nanoparticles were synthesized as a core and then, SrTiO3 nanoparticles were prepared as a shell for it to manufacture SrFe12O19–SrTiO3 nanocomposite. A novel sol-gel auto-combustion green synthesis method has been used with lemon juice as a capping agent. The prepared SrFe12O19–SrTiO3 nanocomposites were characterized by using several techniques to characterize their structural, morphological and magnetic properties. The crystal structures of the nanocomposite were investigated via X-ray diffraction (XRD). The morphology of SrFe12O19– SrTiO3 nanocomposite was studied by using a scanning electron microscope (SEM). The elemental composition of the materials was analyzed by an energy-dispersive X-ray (EDX). Magnetic properties and hysteresis loop of nanopowder were characterized via vibrating sample magnetometer (VSM) in the room temperature. Fourier transform infrared spectroscopy (FTIR) spectra of the samples showed the molecular bands of nanoparticles. Also, the photocatalytic behavior of nanocomposites has been checked by the degradation of azo dyes under irradiation of ultraviolet light.

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Application of vermiculite and limestone to desulphurization and to the removal of dust during briquette combustion

Mineralogical Magazine ◽

10.1180/0026461036760162 ◽

2003 ◽

Vol 67 (6) ◽

pp. 1243-1251 ◽

Cited By ~ 4

Author(s):

A. Lu ◽

D. Zhao ◽

J. Li ◽

C. Wang ◽

S. Qin

Keyword(s):

Electron Microscopy ◽

Coal Combustion ◽

Combustion Temperature ◽

Molar Ratio ◽

X Ray Diffraction ◽

Retention Ratio ◽

X Ray ◽

Major Factors ◽

Chemical Reactant ◽

Scanning Electron

AbstractSmall domestic cooking furnaces are widely used in China. These cooking furnaces release SO2 gas and dust into the atmosphere and cause serious air pollution. Experiments were conducted to investigate the effects of vermiculite, limestone or CaCO3, and combustion temperature and time on desulphurization and dust removal during briquette combustion in small domestic cooking furnaces. Additives used in the coal are vermiculite, CaCO3 and bentonite. Vermiculite is used for its expansion property to improve the contact between CaCO3 and SO2 and to convey O2 into the interior of briquette; CaCO3 is used as a chemical reactant to react with SO2 to form CaSO4; and bentonite is used to develop briquette strength. Expansion of vermiculite develops loose interior structures, such as pores or cracks, inside the briquette, and thus brings enough oxygen for combustion and sulphation reaction. Effective combustion of the original carbon reduces amounts of dust in the fly ash. X-ray diffraction, optical microscopy, and scanning electron microscopy with energy dispersive X-ray analysis show that S exists in the ash only as anhydrite CaSO4, a product of SO2 reacting with CaCO3 and O2. The formation of CaSO4 effectively reduces or eliminates SO2 emission from coal combustion. The major factors controlling S retention are vermiculite, CaCO3 and combustion temperature. The S retention ratio increases with increasing vermiculite amount at 950°C. The S retention ratio also increases with increasing Ca/S molar ratio, and the best Ca/S ratio is 2-3 for most combustion. With 12 g of the original coal, 1 to 2 g of vermiculite, a molar Ca/S ratio of 2.55 by adding CaCO3, and some bentonite, a S retention ratio >65% can be readily achieved. The highest S retention ratio of 97.9% is achieved at 950°C with addition of 2 g of vermiculite, a Ca/S ratio of 2.55 and bentonite.

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Optimization of Green Synthesis Approach of Silver Nanoparticles Using Indonesian Wild Honey

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.891.111 ◽

2021 ◽

Vol 891 ◽

pp. 111-115

Author(s):

Maradhana Agung Marsudi ◽

Farah Fitria Sari ◽

Pandu Mauliddin Wicaksono ◽

Adinda Asmoro ◽

Arif Basuki ◽

...

Keyword(s):

Electron Microscopy ◽

Silver Nanoparticles ◽

Green Synthesis ◽

Synthesis Method ◽

X Ray Diffraction ◽

X Ray ◽

Particle Count ◽

Transmission Electron ◽

Nitrate Precursor ◽

Synthesis Approach

In this work, silver nanoparticles have been successfully synthesized using simple and environmentally friendly ‘green synthesis’ method using Indonesian wild honey as mediator. Particle count and size can be optimized by varying the silver nitrate precursor and honey concentration, with the help of sodium hydroxide as pH regulator. Based on X-ray diffraction (XRD) result, crystalline structure of Ag has been confirmed in sample with impurities from AgCl. Based on dynamic light scattering (DLS) and transmission electron microscopy (TEM) results, it was found that the smallest average particles size of AgNPs (117.5 nm from DLS and 11.1 nm from TEM) was obtained at sample with 5% w/v of honey and 0.5 mM of AgNO3.

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