scholarly journals A Study on the Photocatalytic Reduction of Some Metal Ions in Aqueous Solution Using UV- Titanium Dioxide System

2019 ◽  
pp. 1-7
Author(s):  
I. O. Ekwere ◽  
M. Horsfall ◽  
J. O. E. Otaigbe
Keyword(s):  
Aqueous Solution ◽  
Titanium Dioxide ◽  
Metal Ions ◽  
Metal Ion ◽  
Uv Light ◽  
Kinetic Studies ◽  
Photocatalytic Reduction ◽  
Alkaline Ph ◽  
Removal Of Metal ◽  
Removal Of Metal Ions

The photocatalytic reduction of Cu (II), Pb (II), Cd (II) and Cr (VI) ions in aqueous solution has been investigated. The photocatalyst utilized was nano titanium dioxide, composed of 80% anatase and 20% rutile; the UV light source was a 15 W UV bulb with a wavelength of 254 nm. The results obtained indicated a reduction efficiency order as follows; Cr6+ > Cu2+ > Pb2+ > Cd2+. It was observed that these results correlate with the respective reduction potentials of the metal ions. The effect of pH on the photocatalytic reduction of the metal ions was also carried out and results obtained indicated that with the exception of Cr (VI) ions, higher percentage removal of metal ions from their aqueous solution was recorded at alkaline pH than at acidic pH. This was attributed to an extensive formation of precipitate by the metal ions at alkaline pH. Kinetic studies revealed that the removal of metal ions from their solutions largely followed the pseudo- first-order kinetics. Therefore, the results of this study will be useful in metal ion removal from industrial waste water using photocatalytic process.

Lipoprotein biosurfactant production from an extreme acidophile using fish oil and its immobilization in nanoporous activated carbon for the removal of Ca2+and Cr3+in aqueous solution

RSC Advances ◽  
2014 ◽  
Vol 4 (64) ◽  
pp. 34144-34155 ◽  
Author(s):  
P. Saranya ◽  
S. Swarnalatha ◽  
G. Sekaran
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Fish Oil ◽  
Metal Ions ◽  
Biosurfactant Production ◽  
Removal Of Metal ◽  
Removal Of Metal Ions ◽  
Nanoporous Activated Carbon

Lipoprotein biosurfactant from extreme acidophile using fish oil and its immobilization in nanoporous activated carbon for removal of metal ions.

scholarly journals STUDY OF REMOVAL OF METAL IONS IN WATER USING ZEOLITES SYNTHESIZED WITH CHARCOAL ASHES

2006 ◽  
Vol 05 (3) ◽  
pp. 21-30
Author(s):  
Denise Alves FUNGARO ◽  
Juliana de Carvalho IZIDORO
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Ion Selectivity ◽  
Coal Ash ◽  
Electroplating Effluent ◽  
Zeolitic Material ◽  
Equilibrium Data ◽  
Metal Ion Selectivity ◽  
Removal Of Metal ◽  
Removal Of Metal Ions

The capacity of synthesized zeolites from Brazilian coal ash for the removal of metal ions from aqueous solutions has been investigated. Equilibrium data obtained have been found to fit both the Langmuir and Freundlich adsorption isotherms. The zeolitic material prepared with coal ash from baghouse filter showed the highest removal efficiencies. The metal ion selectivity of this product was determined as: Pb2+ > Cd2+ > Cu2+ > Zn2+ > Ni2+. The maximum cation exchange capacities were between 32.9 and 246.9 mg g-1. Tests showed that the zeolitic material was suitable for removal of zinc from electroplating effluent.

Electrochemical removal of metal ions from aqueous solution: a student workshop

2005 ◽  
Vol 7 (10) ◽  
pp. 943 ◽  
Author(s):  
Gerry A. Ottewill ◽  
Gavin W. Reade ◽  
Sheelagh A. Campbell ◽  
Carlos Ponce de Leon ◽  
Frank C. Walsh
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
Removal Of Metal ◽  
Removal Of Metal Ions ◽  
Electrochemical Removal

Removal of Metal Ions from Aqueous Solutions by Microcapsules Prepared by 8-Hydroxy-Quinoline with Polystyrene

2015 ◽  
Vol 814 ◽  
pp. 441-446
Author(s):  
Wei Xing Chen ◽  
Xiao Fang Gao ◽  
Ai Jie Ma
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
Optical Microscope ◽  
Solvent Evaporation Method ◽  
Initial Ph ◽  
Ft Ir ◽  
Removal Of Metal ◽  
Removal Of Metal Ions ◽  
Hydroxy Quinoline ◽  
Better Than

The removal of Fe3+, Cu2+,Cd2+,Cr3+and Zn2+ions from aqueous solution was studied by sorption onto polystyrene microcapsules containing 8-hydroxy-quinoline as extraction reagent. The micro-capsules containing 8-hydroxy-quinoline were prepared by solvent evaporation method with O/W emulsion and characterized by using optical microscope, Fourier Transform Infrared Spectroscopy (FT-IR). The uptake to Fe3+, Cu2+,Cd2+,Cr3+and Zn2+ions into the microcapsules was studied at deferent conditions. It showed that with the increasing dosage of microcapsules, the removal of metal ions increased too. The longer is standing time, the more is the increasing of adsorption capacity. The sorption of metal ions decreases with the initial pH of the solution increasing, and the sorption of microcapsule for metal ions is lower at 50°C. The sorption of Cr3+, Cu2+and Zn2+ions is highest at 45°C, and that of Fe3+, Cd2+is at 40°C. The results showed that the microcapsules could absorb Cr3+ions better than other metal ions.

scholarly journals Optimisation and Modelling of Pb (II) and Cu (II) Biosorption onto Red Algae (Gracilaria changii) by Using Response Surface Methodology

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2325 ◽  
Author(s):  
Mubeen Isam ◽  
Lavania Baloo ◽  
Shamsul Rahman Mohamed Kutty ◽  
Saba Yavari
Keyword(s):  
Response Surface Methodology ◽  
Metal Ions ◽  
Response Surface ◽  
Metal Ion ◽  
Ion Concentration ◽  
Solution Ph ◽  
Gracilaria Changii ◽  
Red Macroalgae ◽  
Removal Of Metal ◽  
Removal Of Metal Ions

The removal of Pb (II) and Cu (II) ions by using marine red macroalgae (Gracilaria changii) as a biosorbent material was evaluated through the batch equilibrium technique. The effect of solution pH on the removal of metal ions was investigated within the range of 2–7. The response surface methodology (RSM) technique involving central composite design (CCD) was utilised to optimise the three main sorption parameters, namely initial metal ion concentration, contact time, and biosorbent dosage, to achieve maximum ion removal. The models’ adequacy of response was verified by ANOVA. The optimum conditions for removal of Pb (II) and Cu (II) were as follows: pH values of 4.5 and 5, initial concentrations of 40 mg/L, contact times of 115 and 45 min, and biosorbent dosage of 1 g/L, at which the maximum removal percentages were 96.3% and 44.77%, respectively. The results of the adsorption isotherm study showed that the data fitted well with the Langmuir’s model for Pb (II) and Cu (II). The results of the adsorption kinetic study showed that the data fitted well with the pseudo-second order model for Pb (II) and Cu (II). In conclusion, red alga biomass exhibits great potential as an efficient low-cost sorbent for removal of metal ions.

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