scholarly journals Magnetically recyclable Ag/TiO2 co-decorated magnetic silica composite for photodegradation of dibutyl phthalate with fluorescent lamps

2020 ◽  
Vol 81 (4) ◽  
pp. 790-800
Author(s):  
Zhiqiang Ding ◽  
Yue Liu ◽  
Yong Fu ◽  
Feng Chen ◽  
Zhangpei Chen ◽  
...  
Keyword(s):  
Magnetic Particles ◽  
Dibutyl Phthalate ◽  
Degradation Process ◽  
Environmental Safety ◽  
Degradation Efficiency ◽  
Precipitation Method ◽  
Solution Ph ◽  
Fluorescent Lamps ◽  
Butyl Phthalate ◽  
Co Precipitation

Abstract In recent years, industrial contaminants and especially organic pollutions have been threatening both environmental safety and human health. Particularly, dibutyl phthalate (DBP) has been considered as one of the major hazardous contaminants due to its widespread production and ecological toxicities. Consequently, reliable methods toward the efficient and environmentally benign degradation of DBP in wastewater would be very desirable. To this end, a novel magnetically separable porous TiO2/Ag composite photocatalyst with magnetic Fe3O4 particles as the core was developed and successfully introduced to the photocatalytic degradation of DBP under visible irradiation with a fluorescent lamp. The presented work describes the grafting of Ag co-doped TiO2 composite on the silica-modified porous Fe3O4 magnetic particles with a simple and inexpensive chemical co-precipitation method. Through the investigation of the influencing factors including photocatalyst dosage, initial concentration of DBP, solution pH, and H2O2 content, we found that the degradation efficiency could reach 74%. The photodegradation recovery experiment showed that the degradation efficiency of this photocatalyst remained almost the same after five times of reuse. In addition, a plausible degradation process was also proposed involving the attack of active hydroxyl radicals generated from this photocatalysis system and production of the corresponding intermediates of butyl phthalate, diethyl phthalate, dipropyl phthalate, methyl benzoate, and benzoic acid.

Preparation of Chitosan - Hydroxyapatite Nanocomposites

2011 ◽  
Vol 284-286 ◽  
pp. 1760-1763
Author(s):  
Jing Xian Zhang ◽  
Dong Liang Jiang ◽  
Qing Ling Lin ◽  
Zhong Ming Chen ◽  
Zheng Ren Huang
Keyword(s):  
Mechanical Properties ◽  
Fourier Transform ◽  
Phase Composition ◽  
Fourier Transform Infrared ◽  
Chitosan Solution ◽  
Precipitation Method ◽  
Solution Ph ◽  
Cylindrical Form ◽  
Infrared Spectrometer ◽  
Co Precipitation

Chitosan/Hydroxyapatite composites with a homogeneous nanostructure have been prepared by a co-precipitation method. Initially, a chitosan solution was prepared and mixed with the (NH4)2HPO4 solution. After homogenizing, the obtained chitosan/ (NH4)2HPO4 solution was gradually dropped into the Ca (NO3)2.4H2O solution under stirring. The solution pH was adjusted to 9 using NH3.H2O. The precipitate was compressed into a cylindrical form followed by post treatment. The microstructure, phase composition and mechanical properties of the resulting chitosan-HAp composites were characterized. In the presence of chitosan, HAp crystallites were found to be well aligned along the c-axes in the respective aggregates. Fourier transform infrared spectrometer results indicated that an intermolecular bridging complexes might have been developed between the chitosan and HAp. The compact composites obtained were mechanically flexible, the highest strength was found to be 38.4 MPa for chitosan/HAp samples with a 20 wt% of chitosan.

Synthesis and Characterization of Magnetic Fe3O4/PAAm/LMSH Nanocomposite Hydrogel

2016 ◽  
Vol 848 ◽  
pp. 49-56 ◽  
Author(s):  
Shu Qiong Ma ◽  
Hai Hui Bai ◽  
Ran Jin ◽  
Qing Song Zhang ◽  
Xiao Nan Zheng ◽  
...  
Keyword(s):  
Magnetic Particles ◽  
Removal Rate ◽  
Testing Machine ◽  
Magnetic Characteristic ◽  
Magnesium Silicate ◽  
Adsorption Properties ◽  
Precipitation Method ◽  
Nanocomposite Hydrogel ◽  
Swelling Rate ◽  
Co Precipitation

Based on the preparation of polyacrylamide/clays lithium magnesium silicate hydrate (PAAm/LMSH, abbreviated as AP) nanocomposite hydrogel by in-situ free radical polymerization, Fe3O4 nanoparticles were introduced by chemical co-precipitation method, to form magnetic Fe3O4/PAAm/LMSH (abbreviated as MAP) nanocomposite hydrogel. With ESEM, XRD, and TGA technologies, the structures of MAP nanocomposite hydrogel and Fe3O4 nanoparticles formed. Magnetic characteristic of MAP nanocomposite hydrogel was characterized by VSM. The tensile test with Universal Testing Machine was employed for mechanical properties. Furthermore, taking cationic dye Crystal Violet (CV) and anionic dye Methyl Orange (MO) for example, the adsorption properties of MAP nanocomposite hydrogel were analyzed with UV-visible spectrophotometer method. The results show that MAP nanocomposite hydrogel had strong superparamagnetic properties. The introduced Fe3O4 magnetic particles illustrated spinel structure, and nanoparticle size of 8.52 nm. The swelling rate of MAP sample was up to 30.542, showing excellent swelling ability. Compared with AP nanocomposite hydrogel, MAP nanocomposite hydrogel had stronger mechanical strength with the tensile stress of 0.39MPa. Adsorption experiments indicated that MAP nanocomposite hydrogel had favorable adsorption properties on CV with removal rate of 97.6%, 1.27 times that of AP nanocomposite hydrogel. The conclusions confirm the application prospect of MAP nanocomposite hydrogel as dye adsorbent in textile printing and dyeing wastewater treatment.

Green Magnetic Composite Sheet from Durian Shell and Nano-Magnetite Particles

2015 ◽  
Vol 761 ◽  
pp. 515-519 ◽  
Author(s):  
Mohd Khairul Shahril ◽  
Rose Farahiyan Munawar ◽  
Muhd Hafez Mohamed ◽  
Afraha Baiti Arif ◽  
Noraiham Mohamad ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Particles ◽  
Added Value ◽  
Precipitation Method ◽  
Magnetic Composite ◽  
Great Success ◽  
Composite Sheet ◽  
Biomass Waste ◽  
Co Precipitation

Biomass-derived materials such as kenaf pulp and wood chips are a perfect candidate to produce magnetic paper. Furthermore, by using biomass waste, such as paddy straw, sugarcane, bagasse and durian shell, the cost of producing magnetic paper can be further reduced while giving added value to the waste. This paper investigates the potential of producing magnetic sheet from durian shell. Initially, durian shells were dried before undergoing the pulping process. The resulted sheet was then combined with magnetic particles, the nanomagnetite using either lumen loading or in-situ co-precipitation to produce a magnetic composite sheet. After being loaded with magnetic particles, the composite sheets were tested in terms of the homogeneity of the magnetic particles in the samples, degree of loading of the magnetic particles and the magnetic properties of the samples. Results obtained show a great success in producing the magnetic sheet from durian shell waste and nanomagnetite particles. It was also found that the lumen loading method gives better magnetic properties compared to the in-situ co-precipitation method.

Photocatalytic degradation of Eosin B dye in aqueous solution by cadmium oxide nanoparticles

2021 ◽  
pp. 1-10
Author(s):  
Falak Naz ◽  
Khalid Saeed
Keyword(s):  
Cadmium Oxide ◽  
Degradation Efficiency ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cdo Nanoparticles ◽  
Eosin B ◽  
Percent Composition ◽  
Precursor Decomposition ◽  
Co Precipitation

Cadmium oxide (CdO) and potassium (K) doped CdO nanoparticles (NPs) were synthesized by the chemical co-precipitation method and were used as photocatalysts for the degradation of Eosin B dye. The X-ray diffraction results presented that the crystallite size of undoped CdO and K doped CdO NPs were 43.74 and 42.31 nm, respectively. The morphological study and percent composition of synthesized undoped CdO and K doped CdO NPs was done by scanning electron microscope and energy dispersive X-ray analysis. The formation of NPs was confirmed by Fourier transform infrared spectroscopy. The precursor decomposition to CdO after annealing at ∼500 °C was studied by thermogravimetric analysis. The undoped CdO and K doped CdO nanoparticles degraded about 80% and 90% of the dye, respectively, in 140 min. The maximum degradation efficiency of the dye was achieved at a pH of 4, dye initial concentration of 15 ppm, catalyst dose of 20 mg, and a temperature of 45 °C. The degradation efficiency observed for recovered undoped CdO and recovered doped CdO nanoparticles was found to be 63% and 77%, respectively.

Preparation of Hexagonal Fe3O4 Nanometer Particles via Weakly Magnetic Field Assisted Oxidation Co-Precipitation

2011 ◽  
Vol 418-420 ◽  
pp. 286-292
Author(s):  
Da Wei Hu ◽  
Yan Ming Wang
Keyword(s):  
Magnetic Field ◽  
Particle Size ◽  
Magnetic Particles ◽  
Photoelectron Spectra ◽  
Precipitation Method ◽  
X Ray ◽  
Nanometer Particles ◽  
Weakly Magnetic ◽  
Particle Sizer ◽  
Co Precipitation

This paper utilized a novel oxidative co-precipitation method to synthesis hexagonal Fe3O4 nanometer particles, which assisted by a weakly magnetic field. The crystallinity, morphology, particle size distribution, compositions and magnetic properties of the as-prepared particles were investigated using powder X-ray diffraction (XRD), scanning electron microscopy (SEM), ultrasonic particle sizer (UPS), X-ray photoelectron spectra (XPS) and vibrating sample magnetometer (VSM). The formation mechanism of the hexagonal Fe3O4 nanometer particles, which assisted by a weakly magnetic field was also discussed. The results shown that the as-prepared hexagonal particles were purity magnetite (Fe3O4), and the weakly magnetic field could accelerate the phase transformation from goethite (α-FeOOH) to magnetite (Fe3O4), increase the particle size and uniform the morphology. The values of saturation magnetization (Ms) and coercivity (H) of the hexagonal magnetic particles are 71.05 emu•g-1 and 474.3 Oe, respectively, which contributed to the morphology anisotropy of the particles.

scholarly journals Heat dissipation in Sm3+ and Zn2+ co-substituted magnetite (Zn0.1SmxFe2.9-xO4) nanoparticles coated with citric acid and pluronic F127 for hyperthermia application

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
S. Shatooti ◽  
M. Mozaffari ◽  
G. Reiter ◽  
D. Zahn ◽  
S. Dutz
Keyword(s):  
Citric Acid ◽  
Heat Dissipation ◽  
Magnetic Measurements ◽  
Exchange Interactions ◽  
Pluronic F127 ◽  
Precipitation Method ◽  
Solution Ph ◽  
Coated Nanoparticles ◽  
Phase Spinel ◽  
Co Precipitation

AbstractIn this work, Sm3+ and Zn2+ co-substituted magnetite Zn0.1SmxFe2.9-xO4 (x = 0.0, 0.01, 0.02, 0.03, 0.04 and 0.05) nanoparticles, have been prepared via co-precipitation method and were electrostatically and sterically stabilized by citric acid and pluronic F127 coatings. The coated nanoparticles were well dispersed in an aqueous solution (pH 5.5). Magnetic and structural properties of the nanoparticles and their ferrofluids were studied by different methods. XRD studies illustrated that all as-prepared nanoparticles have a single phase spinel structure, with lattice constants affected by samarium cations substitution. The temperature dependence of the magnetization showed that Curie temperatures of the uncoated samples monotonically increased from 430 to 480 °C as Sm3+ content increased, due to increase in A-B super-exchange interactions. Room temperature magnetic measurements exhibited a decrease in saturation magnetization of the uncoated samples from 98.8 to 71.9 emu/g as the Sm3+ content increased, which is attributed to substitution of Sm3+ (1.5 µB) ions for Fe3+ (5 µB) ones in B sublattices. FTIR spectra confirmed that Sm3+ substituted Zn0.1SmxFe2.9-xO4 nanoparticles were coated with both citric acid and pluronic F127 properly. The mean particle size of the coated nanoparticles was 40 nm. Calorimetric measurements showed that the maximum SLP and ILP values obtained for Sm3+ substituted nanoparticles were 259 W/g and 3.49 nHm2/kg (1.08 mg/ml, measured at f = 290 kHz and H = 16kA/m), respectively, that are related to the sample with x = 0.01. Magnetic measurements revealed coercivity, which indicated that hysteresis loss may represent a substantial portion in heat generation. Our results show that these ferrofluids are potential candidates for magnetic hyperthermia applications.

scholarly journals SYNTHESIS OF BIO-NANOMAGNETITE AND ITS OPTIMIZED CONDITIONS FOR PHTHALATE ABSORBTION

2020 ◽  
Vol 4 (3) ◽  
pp. 1-12
Author(s):  
Seyedeh Farzaneh Hosseini ◽  
Zarrin Eshaghi
Keyword(s):  
Fourier Transform ◽  
Magnetic Particles ◽  
Polymeric Nanoparticles ◽  
Precipitation Method ◽  
Magnetic Characteristics ◽  
Coated Particles ◽  
Magnetite Particles ◽  
Co Precipitation ◽  
Optimized Conditions ◽  
Vast Range

Motivation/Background: Magnetic polymeric nanoparticles have vast range of applications in various fields. Coating or encapsulating of magnetic particles with polymers is one of the most useful methods of modifying magnetic nanoparticles. As these coated particles have magnetic characteristics, they can be easily collected with a single magnet instead of burdensome and time-consuming methods such as centrifugation. Method: In this work, nano magnetite particles were synthesized using co-precipitation method and then they were firstly coated with a single biodegradable co-polymer, i.e. poly(butylene adipate-co-terephthalate) (PBAT), and secondly with a mixture of two biodegradable polymers of PBAT and poly(butylene adipate) (PBA). Results: Fourier Transform Infrared (FTIR) spectrum of these two bio-nanoparticles showed their characteristics. They were also used to absorb dibutyle phthalate and dioctyle phthalate from aqueous solutions. UV-Vis was used to characterize optimization of particle mass, time and stirring speed during absorption. XRD spectrum was also taken. Volume, time and stirring speed of desorption were also optimized. In addition, calibration was performed, and the isotherm was plotted for two particles. Conclusions: According to XRD spectrum, particles were in nano range. They had acceptable biodegradation characteristics. They also were efficient in absorbing and desorbing phthalates and were collected easily through magnet.

scholarly journals Microalgae Harvesting: A Review

2019 ◽  
Vol 27 (44) ◽  
pp. 129-143
Author(s):  
Alexandra Kucmanová ◽  
Kristína Gerulová
Keyword(s):  
Magnetic Particles ◽  
Precipitation Method ◽  
Synthesis Methods ◽  
Advantages And Disadvantages ◽  
Commercial Use ◽  
Microalgae Harvesting ◽  
Terrestrial Habitats ◽  
Algal Products ◽  
Co Precipitation ◽  
Surface Modified

Abstract Microalgae are photosynthetic autotrophic microscopic organisms growing in a range of aquatic and terrestrial habitats. They produce a huge complex of compounds in their surroundings which are of important use to humans. Their commercial use lies in human nutrition, animal and aquatic feed, in cosmetics products, natural pigments, pharmaceutical industry, bio-fertilizer for extracting high-value molecules, stable isotope biochemicals, and for the synthesis of antimicrobial, antiviral, antibacterial and anticancer drugs. Therefore, it is necessary to develop a simple, effective and economically advantageous method for harvesting the algal products. Magnetic separation is a simple separation process. Different synthesis methods have been used by researchers to obtain magnetic particles of varying size and shapes according to the algae to be studied. Chemical co-precipitation method has been the most commonly used method, which helps in synthesizing magnetic particles of the micro to nano range. Naked, coated and surface modified are the general types of magnetic particles used for algal harvesting with its own advantages and disadvantages.

scholarly journals Water Decontamination with Magnetic Particles by Adsorption and Chemical Degradation. Influence of the Manufacturing Parameters

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2219
Author(s):  
Paulo A Augusto ◽  
Teresa Castelo-Grande ◽  
Diana Vargas ◽  
Lorenzo Hernández ◽  
Leticia Merchán ◽  
...  
Keyword(s):  
Large Scale ◽  
Magnetic Particles ◽  
Initial Study ◽  
Chemical Degradation ◽  
Precipitation Method ◽  
Environmental Application ◽  
Real Wastewater ◽  
Wastewater Samples ◽  
Co Precipitation ◽  
Manufacturing Parameters

Many different processes for manufacturing of magnetic particles are present in scientific literature. However, the large majority are not able to be applied to large-scale real operations. In this study, we present an experiment undertaken to determine advisable values and options for the main variables and factors for the application of the reverse co-precipitation method to produce magnetic particles for real environmental applications. In such, we have tried a conjugation of values/factors that has led to 12 main experiments and production of 12 different particles. After an initial study concerning their main characteristics, these 12 different particles were applied for the sorption removal of COD from real wastewater samples (efficiencies between 70% and 81%) and degradation of Methylene blue by Fenton reaction (degradation efficiencies up to 100%). The main conclusion from this work is that the best set of values depends on the target environmental application, and this set of values were determined for the two applications studied.

scholarly journals Enhanced photocatalytic activity and chemical sensor development based on ternary B2O3·Zn6Al2O9·ZnO nanomaterials for environmental safety

2017 ◽  
Vol 41 (15) ◽  
pp. 7220-7231 ◽  
Author(s):  
Md Abdus Subhan ◽  
Pallab Chandra Saha ◽  
Mohammed M. Rahman ◽  
Mohammad Arifur Rahman Akand ◽  
Abdullah M. Asiri ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Potential Application ◽  
Chemical Sensor ◽  
Environmental Safety ◽  
Precipitation Method ◽  
Sensor Development ◽  
Photo Catalyst ◽  
Zno Nanomaterials ◽  
Co Precipitation

Preparation of ternary B2O3·Zn6Al2O9·ZnO nanomaterials by a simple co-precipitation method and their potential application as an efficient photo-catalyst as well as chemical sensor has been reported.

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