Facile synthesis, characterization and enhanced catalytic reduction of 4-nitrophenol using NaBH 4 by undoped and Sm 3+ , Gd 3+ , Hf 3+ doped La 2 O 3 nanoparticles
This work focuses on the synthesis of undoped and doped lanthanum oxide nanoparticles (La2O3 NPs) by a simple co-precipitation method for the catalytic reduction of 4-nitrophenol (4-NP) using NaBH4 as a reducing agent. Their optical properties, morphologies, structure, chemical compositions and electronic properties were carefully characterized by XRD, FTIR, SEM, TEM, PL and UV–visible absorption spectroscopy. The SEM and TEM images showed various shape morphologies and sizes of the particles. The XRD pattern revealed a polycrystalline nature with the hexagonal structure of the La2O3 NPs. The synthesized undoped and doped La2O3 NPs were also employed as catalysts for the reduction of 4-nitrophenol, it shows that the doped (Sm3+, Gd3+ and Hf3+) La2O3 NPs provided better catalytic activity than the undoped La2O3 NPs. Moreover, Hf3+ doped La2O3 NPs exhibited an enhanced catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol in 90 min. The catalytic conversion was studied by UV–vis spectroscopy with high reduction rate (k = 2.048 min−1). The applications of the present study may utilize in the removal of toxic pollutants in a cleaning of environmental pollution as well as in industrial applications.
Abstract The fabrication of g-C3N4 based narrow bandgap semiconductor catalysts with uniform dispersion and a strongly coupling interface is one of the main strategies to improve the catalytic activity of semiconductor materials. Here, the g-C3N4 coupled CuS (g-C3N4/CuS) composite catalysts were successfully fabricated via a simple sonochemical method using g-C3N4 nanosheets. The morphology, structure and optical properties of synthesized samples were investigated by SEM-EDS, TEM, XRD, FTIR, UV–...
Abstract Nanosized gold deposited bare and sulfated La2O3 samples were synthesized and utilized for catalytic oxidative cracking of n-propane. Bare La2O3 showed only 10% conversion with 15% olefin selectivity, however significant enhancement in the conversion of n-propane was observed when La2O3 support was deposited with 0.2 wt% gold (25% conversion and 39% olefin selectivity) at 550 °C. Further improvement in conversion (46%) and in 53% selectivity was observed with gold supported 10 wt% SO42−...
The construction of ternary semiconductor nanostructures has attracted much attention in photocatalysis by virtue of their tunable elemental composition and band structure. Here, ternary semiconductor ZnxAg1−xS (0 ≤ x ≤ 1) composites were successfully prepared by a simple and low-cost hydrothermal method without using any surfactant. Combined analyses using XRD, N2 sorption, SEM, TEM and UV-vis DRS revealed that the ternary composite semiconductor materials exhibited well-developed crystalline f...
Last. Lin Yang(Henan Normal University)H-Index: 34
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In this study, three La2O3 hierarchical micro/nanostructures, nanospindles, nanopolyhedra and nanospheres, were synthesized to remove phosphate from microbial growth media for bacterial inactivation as an antimicrobial strategy. The experiment results showed that the morphology of La2O3 hierarchical micro/nanostructures can be controlled by the concentration of the reactants, reaction temperature and cooling treatment. Meanwhile, the properties of the La2O3 were researched for phosphate removal ...
#1Nafiseh Alfi(University of Sistan and Baluchestan)H-Index: 9
#2Ali Reza Rezvani(University of Sistan and Baluchestan)H-Index: 18
Last. Meissam Noroozifar(University of Sistan and Baluchestan)H-Index: 24
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Abstract In this work, a novel method is introduced for the production of uniformly ultra-small palladium nanoparticles (PdNPs) using lanthanum oxide nanoparticles (La2O3NPs) as an adsorbing support and a promoter. Here, the Zn/HCl system is also adopted as a reducing agent. The high distribution and small-size PdNPs, decorated on clean surface of La2O3NPs, are successfully fabricated. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transition electron microscopy (T...
Last. Supon Ananta(CMU: Chiang Mai University)H-Index: 25
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Abstract In this study, various sizes and chemical compositions of Au/Pd nanoparticles with core/shell structure were successfully prepared by employing a simple successive reduction method without addition of any stabilizer. The optical properties, morphologies, chemical compositions and crystal structures of the synthesized particles were fully characterized by using a combination of UV–vis spectroscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, wavelength-dispers...
#1Chun Wang(Agricultural University of Hebei)H-Index: 44
#2Haiyan Zhang(Agricultural University of Hebei)H-Index: 7
Last. Zhi Wang(Agricultural University of Hebei)H-Index: 44
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Multifunctional highly dispersed Pd nanoparticles supported on the metal-organic framework core–shell nanocomposite (Pd@ZIF-8), was prepared by a preferred strategy. The particles were characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, high-resolution transmission electron microscopy and inductively coupled plasma atomic emission spectroscopy. The Pd@ZIF-8 exhibits excellent catalytic activity toward the catalytic reduction of p-nitrophenol to...
#1Teresa Aditya(IIT-KGP: Indian Institute of Technology Kharagpur)H-Index: 9
#2Anjali Pal(IIT-KGP: Indian Institute of Technology Kharagpur)H-Index: 40
Last. Tarasankar Pal(IIT-KGP: Indian Institute of Technology Kharagpur)H-Index: 61
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Nitrophenol reduction to aminophenol with a reducing agent is conveniently carried out in aqueous medium mainly with a metal or metal oxide catalyst. This reduction is presently considered as a benchmark reaction to test a catalyst nanoparticle. Thousands of original reports have enriched this field of nanoparticle catalyzed reaction. Synthesis of different metal and metal oxide nanoparticles and their composites along with their role as catalysts for nitrophenol reduction with varying reducing ...
Abstract Various types of nanosilver have been synthesized by a variety of methods, among them “arc discharge” stands with numerous advantages and calls for a much higher attention. Here, an unprecedented durable powder form of silver nanopowder (AgNP) is produced by DC arc discharge through a simple, convenient, and economical route, at a current of 5–10 A/cm 2 . Effects of media are probed against the quality of the resulting nanoparticles. Among eleven media explored, glycerin/water (10% w/w)...
Last. Haitao Wu(Inner Mongolia University)H-Index: 3
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Abstract K-doped ZnO/La2O3 composite photocatalyst was synthesized via facile sol–gel route using glucose as a complexing agent. The concentrations of K and La2O3 were varied, it was found that the formation of ZnO/La2O3 composite mainly lay in the promotional effect of potassium and 10 mol% content of K-doping was optimum to obtain ZnO/La2O3 composite. The results showed that, in contrast to pure ZnO and undoped ZnO/La2O3, K-doping greatly changed the microstructure, morphology, optical propert...
The aim of this report is to synthesis copper oxide nanocubes (CuO NCs) at room temperature using sodium borohydride as a reducing and Cetyl Trimethyl Ammonium Bromide (CTAB) as a stabilizing agent. The crystallinity and morphology of synthesized CuO-NCs were revealed by x-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM), respectively. The optical properties were carried out using UV-Visible absorbance and Raman spectroscopy. The existing func...
Abstract The paper outlined through a comparative study on the electrode envisaged for the supercapacitor application prepared with polyaniline (PANI) and rare earth metal oxides (La2O3), with the hypothesis of achieving high specific capacitance, high strength, and high energy density. The characterization of samples was permitted differently by using the Scanning Electron Microscope (SEM), Energy Dispersive X-ray (EDS), Fourier-Transform Infrared Spectroscopy (FT-IR), Ultraviolet-Visible Spect...
#1Xiaolian Niu(TUT: Taiyuan University of Technology)H-Index: 1
#2Miao Qin(TUT: Taiyuan University of Technology)H-Index: 1
Last. Di Huang(TUT: Taiyuan University of Technology)H-Index: 8
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Polyamide-6 (PA6) is a synthetic polymer that bears resemblance to collagen in its backbone and has excellent stability in human body fluid. Chitosan (CS) with the similar structure to that of the polysaccharides existing in the extracellular matrix, has a more suitable biodegradation rate for the formation of new-bone. Eelectrospun fiber have nanoscale structure, high porosity and large specific surface area, can simulate the structure and biological function of the natural extracellular matrix...
Abstract In this present work, we report the green synthesis of mixed bimetal oxides (CuO/NiO) for the efficient reduction of toxic nitrophenols (NP, DNP and TNP) in aqueous medium. The CuO/NiO NPs were synthesized by green hydrothermal method combined calcination process. The physiochemical properties of the synthesized CuO/NiO NPs were systematically characterized by using XRD, XPS, FTIR, SEM, and HR-TEM techniques. The calcinated CuO/NiO NPs XRD pattern and SEM morphology show the high crysta...
#1Priyanka Kumari(Central Institute of Medicinal and Aromatic Plants)H-Index: 4
#2Abha Meena(Central Institute of Medicinal and Aromatic Plants)H-Index: 10
Abstract The significance of green synthesised nanoparticles has gained interest in environmental safety and its manufacturing processes. The chemical methods applied for nanoparticle synthesis are expensive and utilise chemicals that are hazardous to the environment hence led to the emergence of the “greener” method. The plant-extract based synthesis of nanoparticles is a feasible alternative approach to chemical reduction techniques. This study aims to develop instant, facile, efficient, low-c...
Abstract Silver doped lanthanum phosphate (LaPO4:Ag) nano-composite was successfully synthesized at various concentrations of silver using wet chemistry. The newly synthesized particles were used in the solar absorber medium of thin-film organic solar cells to assist in photons harvesting. The photoactive layer of the solar cell was composed of poly-3-hexylthiophene(P3HT) and (6–6) phenyl-C61-butyric acid methyl ester (PCBM) molecules blend with a small concentration of LaPO4:Ag by weight. The s...