Adsorption efficiency of hydroxyapatite synthesised from black tilapia fish scales for chromium (VI) removal

Diospyros discolor seed activated with nitric acid was investigated for removing Cr(VI) from aqueous solutions. Batch experiments were used to determine the adsorption efficiency, effect of pH, adsorption isotherm, and kinetics. Langmuir and Freundlich adsorption models were used to analyze data of Cr(VI) uptake. Fourier transform infrared spectroscopy was used to investigate the functional groups and surface morphology was checked using a scanning electron microscope, coupled with energy dispersive spectroscopy. The optimum pH in Cr(VI) uptake was 3.5 and the maximum adsorption efficiency reached 100% at 60 min.

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Adsorption of Chromium(VI) Ions on to TiO2 from Aqueous Solution

Adsorption Science & Technology ◽

10.1177/026361749801600205 ◽

1998 ◽

Vol 16 (2) ◽

pp. 117-126 ◽

Cited By ~ 9

Author(s):

Fu Hongxiang ◽

Lu Gongxuan ◽

Li Shuben

Keyword(s):

Heavy Metal Ions ◽

Ion Concentration ◽

Spectroscopic Methods ◽

Ion Adsorption ◽

Adsorption Efficiency ◽

Organic Species ◽

Chromium Vi ◽

Ft Ir ◽

Ir Spectroscopic

The study of the adsorption of the CrVI ion on to TiO2 not only provides information on the removal of heavy metal ions from polluted aqueous solutions; but is also useful for further investigation of the photocatalytic decontamination of the CrVI ion or of CrVI–organic species which co-exist as pollutants with TiO2 when the latter is used as a stable and highly efficient photocatalyst. It has been found that dark adsorption of the CrVI ion on to TiO2 is mainly dependent on the acidity of the system and the initial concentration of the CrVI ion. As the pH of the system increases, so the extent of adsorption of the CrVI ion decreases. The greatest adsorption was obtained with an initial CrVI ion concentration of ca. 300 μmol/l. The presence of phosphate or acetate ions in the system dramatically decreases the adsorption efficiency of the CrVI ion. In contrast, the addition of formic acid leads to a limited increase in the extent of CrVI ion adsorption. Other organic ions and organic compounds examined showed no interference in CrVI ion adsorption. FT-IR spectroscopic methods were used for the characterization of CrVI ion adsorption on to TiO2.

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Adsorption efficiency of banana blossom peels (musa acuminata colla) adsorbent for chromium (VI) removal

Materials Today Proceedings ◽

10.1016/j.matpr.2021.10.502 ◽

2021 ◽

Author(s):

M.A. Selimin ◽

A.F.A. Latif ◽

Y.C. Er ◽

M.S. Muhamad ◽

H. Basri ◽

...

Keyword(s):

Musa Acuminata ◽

Adsorption Efficiency ◽

Chromium Vi

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Enhanced adsorption efficiency of inorganic chromium (VI) ions by using carbon-encapsulated hematite nanocubes

Journal of Science Advanced Materials and Devices ◽

10.1016/j.jsamd.2020.05.007 ◽

2020 ◽

Vol 5 (3) ◽

pp. 392-399 ◽

Cited By ~ 2

Author(s):

Vu Thi Trang ◽

Le Thi Tam ◽

Nguyen Van Quy ◽

Vu Ngoc Phan ◽

Hoang Van Tuan ◽

...

Keyword(s):

Adsorption Efficiency ◽

Chromium Vi ◽

Enhanced Adsorption

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Investigation the Effects of Green-Synthesized Copper Nanoparticles on the Performance of Activated Carbon-Chitosan-Alginate for the Removal of Cr(VI) from Aqueous Solution

Molecules ◽

10.3390/molecules26092617 ◽

2021 ◽

Vol 26 (9) ◽

pp. 2617

Author(s):

Inas A. Ahmed ◽

Hala S. Hussein ◽

Ahmed H. Ragab ◽

Najla AlMasoud ◽

Ayman A. Ghfar

Keyword(s):

Electron Microscopy ◽

Activated Carbon ◽

Contact Time ◽

Sem Analysis ◽

Adsorption Efficiency ◽

X Ray Diffraction ◽

X Ray ◽

Chromium Vi ◽

Transmission Electron ◽

Freundlich Adsorption Isotherm

In the present investigation, green nano-zerovalent copper (GnZVCu), activated carbon (AC), chitosan (CS) and alginate (ALG) nanocomposites were produced and used for the elimination of chromium (VI) from a polluted solution. The nanocomposites GnZVCu/AC-CS-alginate and AC-CS-alginate were prepared. Analysis and characterization were performed by the following techniques: X-ray diffraction, energy dispersive X-ray spectroscopy, scanning electron microscopy, transmission electron microscopy and Fourier transform infrared spectroscopy. The SEM analysis revealed that the nanocomposites are extremely mesoporous, which leads to the greatest adsorption of Cr+6 (i.e., 97.5% and 95%) for GnZVCu/AC-CS-alginate and AC-CS-alginate, respectively. The adsorption efficiency was enhanced by coupling GnZVCu with AC-CS-alginate with a contact time of 40 min. The maximum elimination of Cr+6 with the two nanocomposites was achieved at pH 2. The isotherm model, Freundlich adsorption isotherm and kinetics model and P.S.O.R kinetic models were discovered to be better suited to describe the exclusion of Cr+6 by the nanocomposites. The results suggested that the synthesized nanocomposites are promising for the segregation of Cr+6 from polluted solutions, specially the GnZVCu/AC-CS-alginate nanocomposite.

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Scanning Electron Microscopy of Fish Scales as an Adjunctive Aid in Speciation

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100095236 ◽

1972 ◽

Vol 30 ◽

pp. 394-395

Author(s):

Edward D. DeLamater ◽

Walter R. Courtenay ◽

Cecil Whitaker

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Lateral Line ◽

Species Differences ◽

Fish Scale ◽

Fish Scales ◽

Anterior Border ◽

The University ◽

Multiple Holes ◽

Scanning Electron

Comparative scanning electron microscopy studies of fish scales of different orders, families, genera and species within genera have demonstrated differences which warrant elaboration. These differences in detail appear to be sufficient to act as “fingerprints”, at least, for family differences. To date, the lateral line scales have been primarily studied. These demonstrate differences in the lateral line canals; the pattern of ridging with or without secondary protuberances along the edges; the pattern of spines or their absence on the anterior border of the scales; the presence or absence of single or multiple holes on the ventral and dorsal sides of the lateral line canal covers. The distances between the ridges in the pattern appear likewise to be important.A statement of fish scale structure and a comparison of family and species differences will be presented.The authors wish to thank Dr. Donald Marzalek and Mr. Wallace Charm of the Marine and Atmospheric Laboratory of the University of Miami and Dr. Sheldon Moll and Dr. Richard Turnage of AMR for their exhaustive help in these preliminary studies.

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SEM analysis of fish scale cross sections: A technique study

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100124124 ◽

1992 ◽

Vol 50 (1) ◽

pp. 744-745

Author(s):

M.E. Lee ◽

A. Moller ◽

P.S.O. Fouche ◽

I.G Gaigher

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Cross Sections ◽

Soft Tissues ◽

Close Association ◽

Sem Analysis ◽

Fish Scale ◽

Fish Scales ◽

Micro Structures ◽

Scanning Electron

Scanning electron microscopy of fish scales has facilitated the application of micro-structures to systematics. Electron microscopy studies have added more information on the structure of the scale and the associated cells, many problems still remain unsolved, because of our incomplete knowledge of the process of calcification. One of the main purposes of these studies has been to study the histology, histochemistry, and ultrastructure of both calcified and decalcified scales, and associated cells, and to obtain more information on the mechanism of calcification in the scales. The study of a calcified scale with the electron microscope is complicated by the difficulty in sectioning this material because of the close association of very hard tissue with very soft tissues. Sections often shatter and blemishes are difficult to avoid. Therefore the aim of this study is firstly to develop techniques for the preparation of cross sections of fish scales for scanning electron microscopy and secondly the application of these techniques for the determination of the structures and calcification of fish scales.

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