Nitrate removal from aqueous solution by way of adsorption on modified sheep wool

2021 ◽  
pp. 1-8
Author(s):  
Mária Porubská ◽  
Marcel Cvik ◽  
Klaudia Jomová ◽  
Zuzana Branišová ◽  
Jana Braniša
Keyword(s):  
Aqueous Solution ◽  
Nitrate Removal ◽  
Sheep Wool

Simultaneous oxidation and reduction treatments of polluted water by a bio-electro reactor

1996 ◽  
Vol 34 (9) ◽  
pp. 101-108 ◽  
Author(s):  
M. Kuroda ◽  
T. Watanabe ◽  
Y. Umedu
Keyword(s):  
Aqueous Solution ◽  
Organic Matter ◽  
Electric Current ◽  
Removal Efficiency ◽  
Concentration Ratio ◽  
Nitrate Removal ◽  
Hydrogen Gas ◽  
Polluted Water ◽  
Simultaneous Oxidation ◽  
Denitrifying Microorganisms

Application of a bio-electro reactor for treatment of various kinds of polluted water was investigated experimentally. Aqueous solution of nitrate, ammonium and/or organic matter were used as synthetic polluted water. Denitrification of the nitrate polluted water without organic matter proceeded effectively by utilizing hydrogen gas produced by electrolysis of water in the reactor. The bio-electro reactor was also available for the treatment of nitrate polluted water containing organic matter when the C/N concentration ratio was up to 1.0 under the condition of 100 mA of applied electric current. The nitrate removal efficiency from nitrate polluted water containing acetate at C/N=1.0 was more than 90% at 5 hours of HRT and 80% even at 2.8 h HRT. For the treatment of ammonium polluted water, nitrification and denitrification proceeded simultaneously in a bio-electro reactor where nitrifying and denitrifying microorganisms were immobilized on the electrodes. The results obtained in this study suggested that the bio-electro reactor system was capable to application for oxidation and reduction treatments of the nitrate and ammonium polluted water.

scholarly journals Synthesis of TiO2/nZVI nanocomposite for nitrate removal from aqueous solution

2019 ◽  
Vol 10 (3) ◽  
pp. 225-236
Author(s):  
Zahra Hejri ◽  
Mehri Hejri ◽  
Maryam Omidvar ◽  
Sadjad Morshedi
Keyword(s):  
Aqueous Solution ◽  
Nitrate Removal

Photocatalytic removal of nitrate using TiO2/polyacrylonitrile nanofiber membrane synthesized by co-electrospinning process

2014 ◽  
Vol 14 (4) ◽  
pp. 554-560 ◽  
Author(s):  
S. P. Suriyaraj ◽  
M. Benasir Begam ◽  
S. G. Deepika ◽  
P. Biji ◽  
R. Selvakumar
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Tio2 Nanoparticles ◽  
Nitrate Removal ◽  
Electrospinning Process ◽  
Order Kinetic ◽  
Nanofiber Membrane ◽  
Electrospinning Technique ◽  
X Ray ◽  
Pan Nanofiber

The present study investigates the development of titanium dioxide (TiO2)/polyacrylonitrile (PAN) nanofiber membrane for the removal of nitrate from aqueous solution by photocatalysis. The TiO2 nanoparticles were synthesized by conventional sol–gel method followed by blending them into PAN polymer. The blended solution was electrospun into nanofiber using the co-electrospinning technique. The nanoparticle, PAN nanofibers and the TiO2 impregnated nanofibers were characterized using suitable techniques like X-ray diffraction, high-resolution transmission electron microscopy and scanning electron microscopy attached with energy dispersive X-ray spectroscopy. The average size and the diameter of the TiO2 nanoparticles and TiO2/PAN nanofibers were found to be 22 ± 0.32 nm and 90 ± 15 nm respectively. TiO2 nanoparticles and TiO2/PAN nanofibers showed maximum nitrate removal of 74.67 and 39% respectively at 10 mg/L nitrate concentration at pH 4. However at higher concentration (50 mg/L), the nitrate removal was found to be only 16.87%. The experimental data were fitted onto pseudo second-order kinetic model. The impregnation of TiO2 nanoparticles into the PAN nanofibers by co-electrospinning techniques lead to higher removal of nitrate in aqueous solution at lower concentration (10 mg/L and below). However at higher concentration, the TiO2/PAN nanofiber membrane was inefficient to remove nitrate.

scholarly journals Adsorption Properties of Au(III) and Cu(II) from Aqueous Solution Using Chemically Treated Sheep Wool

2021 ◽  
Vol 333 ◽  
pp. 04006
Author(s):  
Solongo Enkhzaya ◽  
Koichiro Shiomori ◽  
Bolormaa Oyuntsetseg
Keyword(s):  
Aqueous Solution ◽  
Chemical Treatment ◽  
Low Cost ◽  
High Capacity ◽  
Copper Ion ◽  
Order Kinetic ◽  
Rate Determining Step ◽  
Chemically Treated ◽  
Order Kinetic Model ◽  
Sheep Wool

Au(III) and Cu(II) adsorption from aqueous solution were carried out using sheep wools with chemical treatments, by NaOH, Na2S, NaHSO3, and NaBH4 aqueous solution. The fibrous wool was transformed into a film like structures after the chemical treatment using Na2S. The sheep wool and the chemically treated sheep wool adsorbed selectively Au(III) from Au-Cu binary aqueous solution and the presence of copper ion had no effect on the Au(III) adsorption. Au(III) adsorbed substantially at low pH range. The kinetic experimental data fitted well with the pseudo-second-order kinetic model and the adsorption amount of Au(III) increased with time and reached a plateau after 12 h. The kinetic analysis suggests that rate determining step of Au adsorption would be chemisorption due to the formation of a monolayer on the wool surface. Sheep wool is a low cost, eco-friendly material, and has a high capacity of adsorption, and could be used as a biosorbent for precious and heavy metals by modification of appropriate chemical treatment.

Utilization of bare MgO, CeO2 , and ZnO nanoparticles for nitrate removal from aqueous solution

2018 ◽  
Vol 37 (6) ◽  
pp. 1908-1917 ◽  
Author(s):  
Shahriar Mahdavi ◽  
Peyman Molodi ◽  
Mahboubeh Zarabi
Keyword(s):  
Aqueous Solution ◽  
Zno Nanoparticles ◽  
Nitrate Removal
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