Palladium nanoparticles supported on amine-functionalized glass fiber mat for fixed-bed reactors on the effective removal of hexavalent chromium by catalytic reduction

2018 ◽  
Vol 34 (6) ◽  
pp. 961-968 ◽  
Author(s):  
Yu Gao ◽  
Wuzhu Sun ◽  
Weiyi Yang ◽  
Qi Li
Keyword(s):  
Glass Fiber ◽  
Hexavalent Chromium ◽  
Palladium Nanoparticles ◽  
Catalytic Reduction ◽  
Fixed Bed ◽  
Fixed Bed Reactors ◽  
Amine Functionalized ◽  
Effective Removal

Palladium nanoparticles supported on amine-functionalized SiO2 for the catalytic hexavalent chromium reduction

2016 ◽  
Vol 180 ◽  
pp. 53-64 ◽  
Author(s):  
Metin Celebi ◽  
Mehmet Yurderi ◽  
Ahmet Bulut ◽  
Murat Kaya ◽  
Mehmet Zahmakiran
Keyword(s):  
Hexavalent Chromium ◽  
Palladium Nanoparticles ◽  
Chromium Reduction ◽  
Amine Functionalized

Palladium Nanoparticles Decorated Graphene Oxide: Active and Reusable Nanocatalyst for the Catalytic Reduction of Hexavalent Chromium(VI)

2017 ◽  
Vol 2 (27) ◽  
pp. 8312-8319 ◽  
Author(s):  
Metin Celebi ◽  
Kadir Karakas ◽  
Ilknur Efecan Ertas ◽  
Murat Kaya ◽  
Mehmet Zahmakiran
Keyword(s):  
Graphene Oxide ◽  
Hexavalent Chromium ◽  
Palladium Nanoparticles ◽  
Catalytic Reduction ◽  
Chromium Vi

Catalytic Reduction of Hexavalent Chromium Using Palladium Nanoparticles: An Undergraduate Nanotechnology Laboratory

2013 ◽  
Vol 91 (2) ◽  
pp. 269-273 ◽  
Author(s):  
Omowunmi A. Sadik ◽  
Naumih M. Noah ◽  
Veronica A. Okello ◽  
Zhaoyong Sun
Keyword(s):  
Hexavalent Chromium ◽  
Palladium Nanoparticles ◽  
Catalytic Reduction

Influence of H2 availability in the catalytic reduction of nitrates in fixed bed reactors

2021 ◽  
pp. 116887
Author(s):  
J.A. Baeza ◽  
F. García-Missana ◽  
A.S. Oliveira ◽  
L. Calvo ◽  
M.A. Gilarranz
Keyword(s):  
Catalytic Reduction ◽  
Fixed Bed ◽  
Fixed Bed Reactors

Breakthrough analysis for hexavalent chromium removal from drinking water in a fixed bed column

2009 ◽  
Vol 9 (6) ◽  
pp. 661-670 ◽  
Author(s):  
S. P. Dubey ◽  
K. Gopal
Keyword(s):  
Aqueous Solution ◽  
Hexavalent Chromium ◽  
Fixed Bed ◽  
Entropy Change ◽  
Spectroscopic Technique ◽  
Fixed Bed Column ◽  
Chromium Vi ◽  
Fixed Bed Adsorption ◽  
Optimal Column ◽  
Eucalyptus Bark

The activated carbon of Eucalyptus globulus was tested for their effectiveness in removing hexavalent chromium from aqueous solution using column experiments. Result revealed that adsorption of chromium(VI) on eucalyptus bark carbon was endothermic in nature. Thermodynamic parameters such as the entropy change, enthalpy change and Gibbs free energy change were found to be 1.39 kJ mol−1 K−1, 1.08 kJ mol−1 and −3.85 kJ mol−1, respectively. Different chromium concentrations were used for the fixed bed adsorption studies. The pre- and post-treated adsorbents were characterized using a FTIR spectroscopic technique. It was concluded that Eucalyptus bark carbon column could be used effectively for removal of hexavalent chromium from aqueous solution at optimal column conditions. This study showed that this biological material is potential adsorbent of Cr(VI) from water.

Tertiary Nitrification Pilot Plants on Parisian Waste Water

1990 ◽  
Vol 22 (1-2) ◽  
pp. 347-352 ◽  
Author(s):  
C. Paffoni ◽  
B. Védry ◽  
M. Gousailles
Keyword(s):  
Waste Water ◽  
Metropolitan Area ◽  
Fixed Bed ◽  
Point Of View ◽  
Operating Conditions ◽  
Research Center ◽  
Daily Output ◽  
Practical Point ◽  
Fixed Bed Reactors

The Paris Metropolitan area, which contains over eight million inhabitants, has a daily output of about 3 M cu.meters of wastewater, the purification of which is achieved by SIAAP (Paris Metropolitan Area Sewage Service) in both Achères and Valenton plants. The carbon pollution is eliminated from over 2 M cu.m/day at Achères. In order to improve the quality of output water, its tertiary nitrification in fixed-bed reactors has been contemplated. The BIOFOR (Degremont) and BIOCARBONE (OTV) processes could be tested in semi-industrial pilot reactors at the CRITER research center of SIAAP. At a reference temperature of 13°C, the removed load is approximately 0.5 kg N NH4/m3.day. From a practical point of view, it may be asserted that in such operating conditions as should be at the Achères plant, one cubic meter of filter can handle the tertiary nitification of one cubic meter of purified water per hour at an effluent temperature of 13°C.

Role of filter media in an anaerobic fixed-bed reactor

1995 ◽  
Vol 31 (9) ◽  
pp. 137-144 ◽  
Author(s):  
T. Miyahara ◽  
M. Takano ◽  
T. Noike
Keyword(s):  
Anaerobic Bacteria ◽  
Fixed Bed ◽  
Methanogenic Bacteria ◽  
The Other ◽  
Fixed Bed Reactor ◽  
Filter Media ◽  
Fixed Bed Reactors ◽  
Attached Bacteria ◽  
The Relationship

The relationship between the filter media and the behaviour of anaerobic bacteria was studied using anaerobic fixed-bed reactors. At an HRT of 48 hours, the number of suspended acidogenic bacteria was higher than those attached to the filter media. On the other hand, the number of attached methanogenic bacteria was more than ten times as higher than that of suspended ones. The numbers of suspended and deposited acidogenic and methanogenic bacteria in the reactor operated at an HRT of 3 hours were almost the same as those in the reactor operated at an HRT of 48 hours. Accumulation of attached bacteria was promoted by decreasing the HRT of the reactor. The number of acidogenic bacteria in the reactor packed sparsely with the filter media was higher than that in the closely packed reactor. The number of methanogenic bacteria in the sparsely packed reactor was lower than that in the closely packed reactor.

Modeling of aerated upflow fixed bed reactors for nitrification

1999 ◽  
Vol 39 (4) ◽  
pp. 85-92 ◽  
Author(s):  
J. Behrendt
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Liquid Phase ◽  
Gas Phase ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Bulk Liquid ◽  
Initial Value ◽  
Fixed Bed Reactors ◽  
Number Of Cells

A mathematical model for nitrification in an aerated fixed bed reactor has been developed. This model is based on material balances in the bulk liquid, gas phase and in the biofilm area. The fixed bed is divided into a number of cells according to the reduced remixing behaviour. A fixed bed cell consists of 4 compartments: the support, the gas phase, the bulk liquid phase and the stagnant volume containing the biofilm. In the stagnant volume the biological transmutation of the ammonia is located. The transport phenomena are modelled with mass transfer formulations so that the balances could be formulated as an initial value problem. The results of the simulation and experiments are compared.

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