Preparation of electrospun silk fibroin/Cellulose Acetate blend nanofibers and their applications to heavy metal ions adsorption

2011 ◽  
Vol 12 (4) ◽  
pp. 431-437 ◽  
Author(s):  
Weitao Zhou ◽  
Jianxin He ◽  
Shizhong Cui ◽  
Weidong Gao
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Cellulose Acetate ◽  
Silk Fibroin ◽  
Heavy Metal Ions

Nanofibrous Membrane of Silk Fibroin/Cellulose Acetate Blend for Heavy Metal Ion Adsorption

2010 ◽  
Vol 148-149 ◽  
pp. 1431-1435 ◽  
Author(s):  
Wei Tao Zhou ◽  
Jian Xin He ◽  
Shi Zhong Cui ◽  
Wei Dong Gao
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Cellulose Acetate ◽  
Silk Fibroin ◽  
Metal Ion ◽  
Nanofibrous Membrane ◽  
Heavy Metal Ion ◽  
Ion Adsorption ◽  
Metal Ion Adsorption ◽  
Nanofibrous Membranes

Silk fibroin/cellulose acetate blend Nanofibrous membranes were prepared by electro- spinning and their performances were evaluated as a heavy metal ion adsorbent. The electrospun nanofibrous membranes were comprised of randomly oriented ultra-fine fibers of 100-600nm diameters. As a result of field emission electron microscope (FEEM), compared with pure nanofibrous membranes, the anti-felting shrinkage of SF/CA blend nanofibrous membranes with 20% CA content was markedly improved after treatment with 100% ethanol. Metal ion adsorption test was performed with Cu2+ as a model heavy metal ion in a stock solution. The pure SF nanofibrous membranes exhibited high metal ion capacities compared with that pure CA nanofibrous membrane. Especially, the SF/CA blend nanofibrous membranes had an exceptional performance for the adsorption of metal ions, and the maximum milligrams per gram of metal ions adsorbed reached 22.8mg/g for Cu2+. This indicated that SF and CA had synergetic effect.

scholarly journals Cellulose acetate-Sn(IV) molybdophosphate: A biopolymer supported composite Exchanger for the removal of selected heavy metal ions

2020 ◽  
Vol 34 (2) ◽  
pp. 259-276
Author(s):  
A. M. Taddesse ◽  
T. T. Ketema ◽  
E. Teju
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Cellulose Acetate ◽  
Heavy Metal Ions ◽  
Sol Gel ◽  
Basic Medium ◽  
Separation Potential ◽  
Toxic Heavy Metal ◽  
Gel Method ◽  
Sol Gel Method

Cellulose acetate-tin(IV) molybdophosphate (CATMP) composite exchanger was prepared by mixing biopolymer celluloseacetate with its inorganic counterpart tin(IV) molybdophosphate (TMP) using sol‑gel method. The physical characterization of the as synthesized exchanger was carried out by FTIR, XRD, BET, TGA-DTG and SEM-EDX techniques. Chemical properties such as ion exchange capacity, chemical stability, pH and distribution behavior were carried out. The average IEC of the composite material, as determined by batch equilibrium, was found to be 2.43 meq/g for Na+ ion; higher than its inorganic counterpart, i.e. 1.41 meq/g. This exchanger was also found to be stable in water, acids and organic solvents, but unstable in basic medium. The distribution study (Kd) of the exchanger in different solvent systems showed promising separation potential of the exchanger towards metal ions of analytical interest from a given mixture of toxic heavy metal ions. The sorption studies revealed that the material was selective for Cr(III) and Cd(II) ions and moderately selective for Co(II) ion in solvents employed in this work. Its selectivity was examined by achieving some important binary separations of metal cations on its column indicating its promising application in environmental pollution abatement.                     KEY WORDS: Cation exchanger, Biopolymer, Organic-inorganic hybrid, Sol–gel method, Binary distribution   Bull. Chem. Soc. Ethiop. 2020, 34(2), 259-276 DOI: https://dx.doi.org/10.4314/bcse.v34i2.5

Composite membranes with cellulose acetate surface layer for water treatment

2021 ◽  
Vol 2 ◽  
pp. 32-40
Author(s):  
D. D. Fazullin ◽  
◽  
L. I. Fazullina ◽  
G. V. Mavrin ◽  
I. G. Shaikhiev ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Cellulose Acetate ◽  
Heavy Metal Ions ◽  
Tap Water ◽  
Substrate Surface ◽  
Composite Membranes ◽  
Specific Productivity ◽  
Absorption Bands ◽  
Ultrathin Layers

Microporous composite membranes containing from one to three ultrathin layers were obtained by multistage immersion of a paper base in a solution of cellulose acetate in acetone. The physicochemical properties of membranes have been studied and the parameters of membrane separation of heavy metal ions from tap water have been determined. An increase in the particle size and a decrease in the absolute value of the ζ-potential with an increase in the concentration of cellulose acetate in acetone were revealed. It was found that the porosity of the membranes increased from 47 % to 51 % depending on the number of ultrathin cellulose acetate layers on the substrate surface. A decrease in the moisture absorption of composite membranes and an increase in the contact angle of wetting with distilled water from 30.0° to 68.8°, depending on the number of ultrathin layers, were noted. Microscopic examination of the membrane surface showed that the ultrathin layer consists of many pores with sizes less than 1 micron. The absorption bands in the IR spectra of cellulose acetate and the surface of the composite microporous cellulose acetate (MAC) membrane are identical. The retention capacity of MAC composite membranes, determined by iron ions from an iron (III) chloride solution, ranged from 47.5 to 97.4 % depending on the number of cellulose acetate layers on the substrate surface with a specific productivity of 27.9 to 7399 dm3/(m2·h) and a pressure of 0.35 MPa. A high selectivity of a microporous membrane of three layers of cellulose acetate (MAC3) with respect to heavy metal ions contained in tap water was established: Cr3+ (96 %) > Cu2+ (92 %) > Fe3+ (90 %) > Mn2+ (45 %).

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