Preparation of Fe₃O₄/poly(l‐glutamic acid) microspheres and their adsorption of Cu(II) ions

Abstract

Fe3O4/poly(l‐glutamic acid) (P‐l‐Glu) magnetic microspheres were synthesized in an l‐glutamic acid solution by coprecipitation and a dehydration condensation reaction and were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, and ζ‐potential measurement. P‐l‐Glu was coated on the surface of Fe3O4 microspheres. The average particle diameter of Fe3O4/P‐l‐Glu was 388 nm and dispersed homogeneously in water. The adsorption of Cu(II) ions on Fe3O4/P‐l‐Glu was further studied. The effect of different pH values and reaction times on the adsorption of Fe3O4/P‐l‐Glu was discussed. The adsorption equilibrium was reached in 40 min, and the maximum adsorption for Cu(II) ions was more than 500 mg/g; this value occurred at pH 8 in water. The adsorption dynamic process fit the Freundlich isotherms well, and the adsorption kinetics followed the adsorption mechanism of the pseudo‐second‐order equation, which was the main complexation reaction. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43730.

Construction of a novel double network polymer composite and evaluation of its highly efficient adsorption properties for copper ions

“…Copper ions are considered an eco‐toxicological hazard for organisms. Though copper is an essential trace element inside the human body participating in the processes of metabolism, excessive intake of copper will accumulate in human body and cause serious health diseases such as liver cirrhosis, metabolic disorders etc 10,16 . If the wastewater containing copper ions is dumped into the rivers, the lakes or the oceans without any treatment, it would permanently damage the water‐based biological system 21,22 .…”

“…Therefore, efficient adsorbents become the decisive factor in the adsorption process of heavy metals ions, and the researches on exploring the novel adsorbents with high efficiency for heavy metals adsorption become very essential. [4][5][6][7][8][9][10][11][12][13][14][15] The development of double network polymer adsorbents for heavy metals adsorption, generally which are prepared by using poly-blending two kinds of polymer precursor, is highly desirable and is a main challenge in recent years. [16][17][18] For instance, Zhao et al 19 developed α-ketoglutaric acid modified chitosan/polyacrylamide semiinterpenetrating polymer network hydrogen for heavy metals adsorption.…”

“…Heavy metals are common pollutants found in various industrial effluents, which have represented a serious threat to the environment and the human being because of their toxic and lethal effects, and adsorption technique is a promising method that is very important to remove the refractory pollutants from solution system because of its facile operation processes and high efficiency. Therefore, efficient adsorbents become the decisive factor in the adsorption process of heavy metals ions, and the researches on exploring the novel adsorbents with high efficiency for heavy metals adsorption become very essential 4–15 . The development of double network polymer adsorbents for heavy metals adsorption, generally which are prepared by using poly‐blending two kinds of polymer precursor, is highly desirable and is a main challenge in recent years 16–18 .…”

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

“…The adsorption properties of functionalized Fe 3 O 4 are distinctly affected by the kinds of organic acids used [41]. To date, many functionalized Fe 3 O 4 particles have been prepared using 3-aminopropyltriethoxysilane and succinic anhydride [42], poly(amic acid) triethylamine salts [43], poly(acrylic acid) [44], L-glutamic acid [45], L-cysteine [46], ammonium hydroxide (3-mercaptopropyl)-trimethoxysilane [47], oleic acid combined with methyl methacrylate, allyl thiourea and ethylenediamine [48], citric acid [49], amino acid [50], amino-functionalized poly(dimethylsiloxane) [51], and aminoguanidinopentanoic acid functionalized benzene dicarboxylic [52].…”

On the Role of Poly-Glutamic Acid in the Early Stages of Iron(III) (Oxy)(hydr)oxide Formation

“…Polyglutamic acid (pGlu) is an important biopolymer, extensively used in food, medical, and wastewater applications [14]. Its addition to inorganic minerals can improve the overall (bio)-response, as in recently formulated alum-pGlu vaccine adjuvants [15], sorbent materials [16], and contrast agents [17]. Besides, pGlu serves as a model molecule to study the interaction of inorganic systems with polypeptides, assessing preferential binding sites and conformational changes [18], since it exists in biomolecular templates for heterogeneous nucleation and growth of iron(oxy)(hydr)oxide nanoparticles [19].…”