Polyacrylonitrile/Kaolinite Hybrid Nanofiber Mats Aimed for Treatment of Polluted Water

2009 ◽  
Author(s):  
Deng-Guang Yu ◽  
Xiao-Fei Zhang ◽  
Xia-Xia Shen ◽  
Li-Min Zhu ◽  
C. Branford-White ◽  
...  
Keyword(s):  
Polluted Water ◽  
Hybrid Nanofiber ◽  
Nanofiber Mats

Deposition of MOFs on Polydopamine-Modified Electrospun Polyvinyl Alcohol/Silica Nanofibers Mats for Chloramphenicol Adsorption in Water

NANO ◽  
2020 ◽  
Vol 15 (04) ◽  
pp. 2050046 ◽  
Author(s):  
Aowen Li ◽  
Meimei Zhou ◽  
Pingping Luo ◽  
Jiaxin Shang ◽  
Pengbo Wang ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Electrospun Nanofibers ◽  
Silica Network ◽  
Inorganic Hybrid ◽  
Application Range ◽  
Hybrid Nanofiber ◽  
Nanofiber Mats

Nanofiber mats produced by electrospinning, with the advantages of specific surface area, porosity and chemical tenability, are an ideal support material for deposition of metal[Formula: see text]organic framework (MOF) crystals. In this study, four types of MOFs (MIL-53(Al), ZIF-8, UiO-66-NH2 and NH2-MIL-125(Ti)) were deposited on polydopamine (PDA)-modified electrospun polyvinyl alcohol (PVA)/SiO2 organic[Formula: see text]inorganic hybrid nanofiber mats by bulky synthesis. Because of the formation of Si–O–C–O–Si bridges between PVA chains and silica network, electrospun PVA/SiO2 organic[Formula: see text]inorganic hybrid nanofiber mats are quite stable in water or organic solvents and at high temperature are suitable as supports for MOFs deposition. The PDA layer, which exhibits a powerful adhesive ability to attach foreign objects, can effectively improve growth of MOFs on the surface of PVA/SiO2 nanofiber mats. The obtained MOF composites combining the unique properties of electrospun nanofibers mats and MOFs particles become flexible and tailorable, greatly expanding the application range of MOFs materials. The synthesized MOF composites were used to adsorb chloramphenicol (CAP) in water. It was found that the four MOF composites could remove CAP from water effectively and MIL-53(Al) composite had the highest adsorption capacity due to the higher specific surface area.

Preparation of 3D crimped ZnO / PAN hybrid nanofiber mats with photocatalytic activity and antibacterial properties by blow‐spinning

2020 ◽  
Vol 138 (9) ◽  
pp. 49908
Author(s):  
Zhiqiang Du ◽  
Yang Chen ◽  
Martin Jensen ◽  
Ning Wang ◽  
Xianfeng Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Antibacterial Properties ◽  
Hybrid Nanofiber ◽  
Nanofiber Mats

scholarly journals Incorporation of Vanadium Oxide in Silica Nanofiber Mats via Electrospinning and Sol-Gel Synthesis

2006 ◽  
Vol 2006 ◽  
pp. 1-10 ◽  
Author(s):  
Jeanne E. Panels ◽  
Yong Lak Joo
Keyword(s):  
Sol Gel ◽  
Vanadium Content ◽  
Degree Of Crystallinity ◽  
Fiber Axis ◽  
Sem Images ◽  
Submicron Scale ◽  
Silica Nanofibers ◽  
Hybrid Nanofiber ◽  
Nanofiber Mats ◽  
Silica Nanofiber

Submicron scale vanadia/silica hybrid nanofiber mats have been produced by electrospinning silica sol-gel precursor containing vanadium oxytriisopropoxide (VOTIP), followed by calcinations at high temperature. The properties of the resulting inorganic hybrid nanofiber mats are compared to those of electrospun pure silica nanofibers. SEM images show fibers are submicron in diameter and their morphology is maintained after calcination. Physisorption experiments reveal that silica nanofiber mats have a high specific surface area of 63 m2/g. FT-IR spectra exhibit Si—O vibrations and indicate the presence of V2O5in the fibers. XPS studies reveal that the ratio of Si to O is close to 0.5 on the surface of fibers and the amount of vanadium on the surface of fibers increases with calcination. XRD diffraction patterns show that silica nanofibers are amorphous and orthorhombic V2O5crystals have formed after calcination. EFTEM images demonstrate the growth of crystals on the surface of fibers containing vanadium after calcination. SEM images of fibers with high-vanadium content (50 mol%V: Si) show that vanadia crystals are mostly aligned along the fiber axis. XPS shows an increase in vanadium contents at the surface, and XRD patterns exhibit an increase in the degree of crystallinity. A coaxial electrospinning scheme has successfully been employed to selectively place V2O5in the skin layer.

scholarly journals Fabrication of ZnO Nanoparticle-Decorated Nanofiber Mat with High Uniformity Protected by Constructing Tri-Layer Structure

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1859 ◽  
Author(s):  
Duy-Nam Phan ◽  
Hyeong Yeol Choi ◽  
Seong-Geun Oh ◽  
Myungwoong Kim ◽  
Hoik Lee
Keyword(s):  
Zno Nanoparticles ◽  
Layer Structure ◽  
Solvent Molecule ◽  
Electrospinning Process ◽  
Zno Nanoparticle ◽  
Residual Solvent ◽  
Inorganic Particles ◽  
Long Term Stability ◽  
Hybrid Nanofiber ◽  
Nanofiber Mats

We demonstrate a sequential electrospinning process involving the adsorption of ZnO nanoparticles on the surface of bio-based polyester, which is a terpolyester of a renewable isosorbide (ISB) monomer, ethylene glycol, 1,4-cyclohexane dimethanol, and terephthalic acid, the-so-called PEICT, to fabricate stable ZnO nanoparticles/PEICT nanofiber composite system protected with other two PEICT nanofiber mats. We found that post-electrospinning treatment with a particular solvent was effective to remove a residual solvent molecule in the PEICT nanofibers, which induced significant aggregation of the nanoparticles, leading to non-uniform distribution of the particles on the surface. Sequential electrospinning of the PEICT solution to sandwich ZnO nanoparticle-decorated PEICT nanofiber mat enabled to attain protected the inorganic/organic hybrid nanofiber mat, improving the long-term stability, and the reproducibility of the inorganic particles decorated nanofiber fabrication.

IMPACT OF SEWAGE EFFLUENTS ON WETLAND FLORA OF AZAMGARH DISTRICT

2019 ◽  
Vol 25 (1) ◽  
Author(s):  
GAJRAJ PANDEY ◽  
S.N. CHAUBEY ◽  
N.K. SRIVASTAVA
Keyword(s):  
Uttar Pradesh ◽  
Polluted Water ◽  
Sewage Effluents

Sewage effluents were studied in polluted water including toxic damages on the flora of the area of Azamgarh district of Uttar Pradesh, India.

Phyto-purification of polluted water by using Poaceae case of Lake Reghaia

2019 ◽  
Vol 51 (3) ◽  
Author(s):  
Boussaid Khadidja ◽  
Cheboutimeziou Nadjiba
Keyword(s):  
Polluted Water

Reducing the Ecotoxicity of Pesticide Polluted Waters by Electrochemical Methods

2019 ◽  
Vol 70 (5) ◽  
pp. 1574-1578
Author(s):  
Cristian Neamtu ◽  
Bogdan Tutunaru ◽  
Adriana Samide ◽  
Alexandru Popescu
Keyword(s):  
Nitrogen Atmosphere ◽  
Constant Current ◽  
Polluted Water ◽  
Gaseous Nitrogen ◽  
Constant Current Density ◽  
Electrochemical Approach ◽  
Saline Waters ◽  
Thermal Combustion ◽  
Polluted Waters ◽  
Thermal Stability Of

Electrochlorination constitutes an electrochemical approach for the treatment of pesticide-containing wastewaters. This study evaluated the electrochemical and thermal stability of four pesticides and the efficiency of electrochlorination to remove and detoxify the simulated polluted water with: Acetamiprid, Emamectin, Imidacloprid and Propineb. This study reports the experimental results obtained by cyclic voltammetry and electrolysis at constant current density in association with UV-Vis spectrophotometry. In saline waters this pesticides are electrochemical active and anodic peaks are registered in the corresponding voltammograms. After thermal combustion, in a gaseous nitrogen atmosphere, a residue ranging from 15 to 45 % is observed at 500 �C.

Utilisation of Biomass and Hybrid Biochar from Elephant Grass and Low Density Polyethylene for the Competitive Adsorption of Pb(II), Cu(II), Fe(II) and Zn(II) from Aqueous Media

2020 ◽  
Vol 13 ◽  
Author(s):  
Joshua O. Ighalo ◽  
Lois T. Arowoyele ◽  
Samuel Ogunniyi ◽  
Comfort A. Adeyanju ◽  
Folasade M. Oladipo-Emmanuel ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Removal Efficiency ◽  
Contact Time ◽  
Competitive Adsorption ◽  
Adsorption Process ◽  
Aqueous Media ◽  
Polluted Water ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Elephant Grass

Background: The presence of pollutants in polluted water is not singularized hence pollutant species are constantly in competition for active sites during the adsorption process. A key advantage of competitive adsorption studies is that it informs on the adsorbent performance in real water treatment applications. Objective: This study aims to investigate the competitive adsorption of Pb(II), Cu(II), Fe(II) and Zn(II) using elephant grass (Pennisetum purpureum) biochar and hybrid biochar from LDPE. Method: The produced biochar was characterised by Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The effect of adsorption parameters, equilibrium isotherm modelling and parametric studies were conducted based on data from the batch adsorption experiments. Results: For both adsorbents, the removal efficiency was >99% over the domain of the entire investigation for dosage and contact time suggesting that they are very efficient for removing multiple heavy metals from aqueous media. It was observed that removal efficiency was optimal at 2 g/l dosage and contact time of 20 minutes for both adsorbent types. The Elovich isotherm and the pseudo-second order kinetic models were best-fit for the competitive adsorption process. Conclusion: The study was able to successfully reveal that biomass biochar from elephant grass and hybrid biochar from LDPE can be used as effective adsorbent material for the removal of heavy metals from aqueous media. This study bears a positive implication for environmental protection and solid waste management.

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