Cryogenic electron microscopy of rodlike or wormlike micelles in aqueous solutions of nonionic surfactant hexaethylene glycol monohexadecyl ether

Langmuir ◽  
1992 ◽  
Vol 8 (9) ◽  
pp. 2200-2205 ◽  
Author(s):  
Z. Lin ◽  
L. E. Scriven ◽  
H. T. Davis
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solutions ◽  
Nonionic Surfactant ◽  
Wormlike Micelles

scholarly journals Magnetically Recyclable Wool Keratin Modified Magnetite Powders for Efficient Removal of Cu2+ Ions from Aqueous Solutions

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1068
Author(s):  
Xinyue Zhang ◽  
Yani Guo ◽  
Wenjun Li ◽  
Jinyuan Zhang ◽  
Hailiang Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Ion Concentration ◽  
Bet Surface Area ◽  
Chemical Compositions ◽  
Ion Adsorption ◽  
X Ray ◽  
Wool Keratin

The treatment of wastewater containing heavy metals and the utilization of wool waste are very important for the sustainable development of textile mills. In this study, the wool keratin modified magnetite (Fe3O4) powders were fabricated by using wool waste via a co-precipitation technique for removal of Cu2+ ions from aqueous solutions. The morphology, chemical compositions, crystal structure, microstructure, magnetism properties, organic content, and specific surface area of as-fabricated powders were systematically characterized by various techniques including field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), thermogravimetric (TG) analysis, and Brunauer–Emmett–Teller (BET) surface area analyzer. The effects of experimental parameters such as the volume of wool keratin hydrolysate, the dosage of powder, the initial Cu2+ ion concentration, and the pH value of solution on the adsorption capacity of Cu2+ ions by the powders were examined. The experimental results indicated that the Cu2+ ion adsorption performance of the wool keratin modified Fe3O4 powders exhibited much better than that of the chitosan modified ones with a maximum Cu2+ adsorption capacity of 27.4 mg/g under favorable conditions (0.05 g powders; 50 mL of 40 mg/L CuSO4; pH 5; temperature 293 K). The high adsorption capacity towards Cu2+ ions on the wool keratin modified Fe3O4 powders was primarily because of the strong surface complexation of –COOH and –NH2 functional groups of wool keratins with Cu2+ ions. The Cu2+ ion adsorption process on the wool keratin modified Fe3O4 powders followed the Temkin adsorption isotherm model and the intraparticle diffusion and pseudo-second-order adsorption kinetic models. After Cu2+ ion removal, the wool keratin modified Fe3O4 powders were easily separated using a magnet from aqueous solution and efficiently regenerated using 0.5 M ethylene diamine tetraacetic acid (EDTA)-H2SO4 eluting. The wool keratin modified Fe3O4 powders possessed good regenerative performance after five cycles. This study provided a feasible way to utilize waste wool textiles for preparing magnetic biomass-based adsorbents for the removal of heavy metal ions from aqueous solutions.

Effectiveness of Calcium Deficiency in Nanosized Hydroxyapatite for Removal of Fe(II), Cu(II), Ni(II) and Cr(VI) Ions from Aqueous Solutions

2019 ◽  
Vol 56 ◽  
pp. 17-27
Author(s):  
Van Dat Doan ◽  
Van Thuan Le ◽  
Hoang Sinh Le ◽  
Dinh Hien Ta ◽  
Hoai Thuong Nguyen
Keyword(s):  
Electron Microscopy ◽  
Ion Exchange ◽  
Aqueous Solutions ◽  
Calcium Deficiency ◽  
Exchange Mechanism ◽  
Precipitation Method ◽  
X Ray ◽  
Transmission Electron ◽  
Bet Method ◽  
Langmuir Isotherm Model

In this work, nanosized calcium deficient hydroxyapatite (nCDHA) was synthesized by the precipitation method, and then utilized as an adsorbent for removal of Fe (II), Cu (II), Ni (II) and Cr (VI) ions from aqueous solutions after characterizing it by various techniques as scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX) and BET method. A possible structure of synthesized nCDHA was proposed. The adsorption study indicated that the adsorption equilibrium is well fitted with Langmuir isotherm model with the maximum adsorption capacities followed the order of Fe (II) > Cu (II) > Ni (II) > Cr (VI) with the values of 137.23, 128.02, 83.19 and 2.92 mg/g, respectively. The ion-exchange mechanism was dominant for the adsorption of metal ions onto nCDHA at initial metal concentrations lower than 0.01 mol/L. Along with the ion-exchange mechanism, there was an additional precipitation occurred on the surface of nCDHA in the case of Fe (II) and Cu (II) at initial concentrations higher than 0.01 mol/L.

The Association of Picrate Ions with Amphiphilic Cations in Water and Aqueous Solutions of Nonionic Surfactant and β-Cyclodextrin

2005 ◽  
Vol 67 (6) ◽  
pp. 727-733 ◽  
Author(s):  
A. B. Ziyatdinova ◽  
S. A. Mirsaizyanova ◽  
Z. A. Saprykova ◽  
R. R. Amirov
Keyword(s):  
Aqueous Solutions ◽  
Nonionic Surfactant

scholarly journals Growth of wormlike micelles in nonionic surfactant solutions: Quantitative theory vs. experiment

2018 ◽  
Vol 256 ◽  
pp. 1-22 ◽  
Author(s):  
Krassimir D. Danov ◽  
Peter A. Kralchevsky ◽  
Simeon D. Stoyanov ◽  
Joanne L. Cook ◽  
Ian P. Stott ◽  
...  
Keyword(s):  
Nonionic Surfactant ◽  
Wormlike Micelles ◽  
Quantitative Theory ◽  
Surfactant Solutions

scholarly journals Effects of Degradation on Drag Reduction in Turbulent Pipe Flow of Nonionic Surfactant Aqueous Solutions

2012 ◽  
Vol 40 (2) ◽  
pp. 69-77 ◽  
Author(s):  
Shinji Tamano ◽  
Kotaro Miyagawa ◽  
Yohei Morinishi ◽  
Motoyuki Itoh ◽  
Keijiro Taga
Keyword(s):  
Aqueous Solutions ◽  
Drag Reduction ◽  
Nonionic Surfactant ◽  
Pipe Flow ◽  
Turbulent Pipe Flow

scholarly journals Solubilization of Polyelectrolytic Hairy-Rod Polyfluorene in Aqueous Solutions of Nonionic Surfactant

2006 ◽  
Vol 110 (21) ◽  
pp. 10248-10257 ◽  
Author(s):  
Matti Knaapila ◽  
László Almásy ◽  
Vasil M. Garamus ◽  
Christopher Pearson ◽  
Swapna Pradhan ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Nonionic Surfactant

scholarly journals Wormlike Micelles in Mixed Amino Acid Surfactant/Nonionic Surfactant Aqueous Systems and the Effect of Added Electrolytes

2009 ◽  
Vol 58 (5) ◽  
pp. 243-254 ◽  
Author(s):  
Rekha Goswami Shrestha ◽  
Carlos Rodriguez-Abreu ◽  
Kenji Aramaki
Keyword(s):  
Amino Acid ◽  
Nonionic Surfactant ◽  
Wormlike Micelles ◽  
Aqueous Systems

Wormlike micelles constructed by a highly water-soluble carboxylate surfactant containing a phenoxy and nonionic surfactant

2017 ◽  
Vol 248 ◽  
pp. 595-601 ◽  
Author(s):  
Zhaolan Zhai ◽  
Xinyan Yan ◽  
Zhanqian Song ◽  
Shibin Shang ◽  
Xiaoping Rao
Keyword(s):  
Nonionic Surfactant ◽  
Water Soluble ◽  
Wormlike Micelles
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