Hydrothermal synthesis, characterization, and growth mechanism of hematite nanoparticles

Khalil, Munawar; Yu, Jianjia; Liu, Ning; Lee, Robert L.

doi:10.1007/s11051-014-2362-x

Cited by 71 publications

(29 citation statements)

References 35 publications

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“…Hematite nanocatalysts were synthesized via hydrothermal method according to our previous work. 35 In this method, a mixture of aqueous iron (III) chloride and ammonium hydroxide solution was prepared and heated at 120 o C for 24 hours in a Teflon-lined stainless-steel autoclave. The reaction products were then centrifuged and washed with distilled water and ethanol three times, and finally dried under vacuum at 70°C for 12 hours.…”

Section: Preparation Of Hematite Nanocatalystmentioning

confidence: 99%

“…Hematite nanoparticles were synthesized using a simple and facile hydrothermal method according to our previous work. 35 The effects of reaction time and temperature, amount of catalyst, ratio of thiophene/water, size of hematite nanoparticles, and the presence of a hydrogen donor were investigated in terms of thiophene conversion. Moreover, the possible catalytic mechanism of thiophene on the hematite nanoparticle surface was also investigated in this study.…”

Section: Introductionmentioning

confidence: 99%

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Hematite nanoparticles in aquathermolysis: A desulfurization study of thiophene

Khalil

Lee

Liu

2015

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The potential usage of hematite nanoparticles as heterogeneous catalysts in aquathermolysis was investigated in this work. The desulfurization of thiophene was studied to investigate the catalytic activity of hematite in the aquathermolysis of heavy oil. It was found that reaction conditions, e.g., reaction time and temperature, ratio between thiophene and water, hematite nanoparticle size, catalyst concentration, and the presence of hydrogen donors, influenced the ability of hematite nanoparticles to decompose thiophene. Experimental results showed that thiophene conversion was increased with reaction time, temperature and catalyst concentration but decreased with thiophene/water ratio and particle size. Further analysis showed that the activity of the hematite nanocatalyst was also reduced in the presence of hydrogen donors. This is because hydrogen donors occupy the catalyst surface and block the catalytic sites. Furthermore, FTIR and XRD analyses revealed that thiophene underwent oxidative

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Section: Preparation Of Hematite Nanocatalystmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hematite nanoparticles in aquathermolysis: A desulfurization study of thiophene

Khalil

Lee

Liu

2015

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“…Hydrothermal synthesis was used to produce nanoparticles of other metals too. For instance, polyhedron-shaped hematite (a-Fe2O3) nanoparticles were successfully synthesized via a facile hydrothermal method by mixing FeCl3 and NH 4 OH at high temperature [21].…”

Section: Introductionmentioning

confidence: 99%

Antibacterial properties of films of cellulose composites with silver nanoparticles and antibiotics

et al. 2018

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The present study describes production of bacterial cellulose composites with silver nanoparticles and antibiotics and compares their properties. Bacterial cellulose (BC) composites synthesized in the culture of the strain of acetic acid bacterium Komagataeibacter xylinus VKPM B-12068 with silver nanoparticles, BC/AgNps, were produced hydrothermally, under different AgNO 3 concentrations (0.0001, 0.001, and 0.01 M) in the reaction medium. The presence of silver in the BC/AgNp composites was confirmed by elemental analysis conducted using scanning electron microscopy with a system of X-ray spectral analysis. Analysis showed that the average atomic number of silver particles in composite samples depended on the concentration of AgNO 3 : as AgNO 3 concentration in the reaction solution was increased, silver content in the composites increased from 0.044 to 0.37 mg/cm 2. BC composites with amikacin and ceftriaxone were prepared by immersing dry BC films in solutions containing different concentrations of the antibiotics. The surface structure and properties and physicochemical and mechanical characteristics of composites were investigated using SEM, DSC, X-ray analysis, the system for measuring water contact angles, and electromechanical tensile testing machine. The disk-diffusion method and the shake-flask culture method used in this study showed that all experimental composites had pronounced antibacterial activity against E. coli, Ps. eruginosa, K. pneumoniae, and St. aureus, and the BC/antibiotic composites were more active than BC/AgNp ones; S. aureus was the most susceptible to the effect of BC composites. No potential cytotoxicity was detected in any of the BC/AgNp composites in the NIH 3T3 mouse fibroblast cell culture, in contrast to the BC/antibiotic composites. These results suggest that BC composites constructed in the present study hold promise as dressings for managing wounds, including contaminated ones.

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“…Various methods for synthesizing nanosized hematite particles, such as sol-gel, coprecipitation, and hydrothermal methods, have been widely reported (Davar et al, 2016; 583 Cuong et al, 2014;Khalil et al, 2014). However, synthetic methods that allow large-scale production with precise control of the size, morphology and dispersity are still underdeveloped.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Hematite Nanoparticles using Ultrasonic Sonochemistry Method

Khalil¹,

Liu²,

Lee³

2017

IJTech

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This paper presents an investigation on the method for synthesizing hematite nanoparticle using ultrasonic sonochemistry. The effect of various bases with different basicity strengths, i.e. NaOH, NH 4 OH, and butylamine, as well as sintering treatment on the purity and crystallinity of hematite nanoparticles was studied. In this work, the as-synthesized hematite nanoparticles were characterized using FTIR, XRD, and HR-TEM analyses. The results showed that the formation of hematite crystal can undergo two possible reaction pathways depending on the basicity of the solution. When strong bases like NaOH and butylamine were used, iron(III) ion could react with water to form iron complexes, which further grow into rod-like magnetite nanocrystals as the major product. However, direct reaction of iron(III) ion with hydroxide ion to form hematite was observed when a weak base like NH 4 OH was used. Furthermore, it was also found that most of the polymorphous iron oxide precursors can be transformed into hematite crystals via high-temperature sintering.

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Hydrothermal synthesis, characterization, and growth mechanism of hematite nanoparticles

Cited by 71 publications

References 35 publications

Hematite nanoparticles in aquathermolysis: A desulfurization study of thiophene

Hematite nanoparticles in aquathermolysis: A desulfurization study of thiophene

Antibacterial properties of films of cellulose composites with silver nanoparticles and antibiotics

Synthesis and Characterization of Hematite Nanoparticles using Ultrasonic Sonochemistry Method

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