Transition Scenarios during the Evolution of the Belousov−Zhabotinsky Reaction in an Unstirred Batch Reactor

1999 ◽  
Vol 103 (33) ◽  
pp. 6564-6570 ◽  
Author(s):  
Mauro Rustici ◽  
Carlo Caravati ◽  
Enrico Petretto ◽  
Mario Branca ◽  
Nadia Marchettini
Keyword(s):  
Batch Reactor ◽  
Belousov Zhabotinsky Reaction

scholarly journals New evidence of transient complex oscillations in a closed, well-stirred belousov-zhabotinsky system

2006 ◽  
Vol 71 (6) ◽  
pp. 605-612 ◽  
Author(s):  
Ljiljana Kolar-Anic ◽  
Slavica Blagojevic ◽  
Natasa Pejic ◽  
Nebojsa Begovic ◽  
Stevan Blagojevic ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Malonic Acid ◽  
Batch Reactor ◽  
One Dimensional ◽  
Transient Complex ◽  
One Dimensional Maps ◽  
New Evidence ◽  
Belousov Zhabotinsky Reaction ◽  
Influence Of Noise

Some new experimental evidence of complex irregular oscillations in the Belousov-Zhabotinsky reaction realized in a batch reactor is presented. The results were obtained under relatively low cerium and malonic acid concentrations. One-dimensional maps were used for general discussion, and particularly, for the influence of noise on the evolution of the oscillations.

APPLICATION OF COHEN'S CLASS TIME-FREQUENCY DISTRIBUTIONS IN THE BELOUSOV–ZHABOTINSKY REACTION ANALYSIS

2004 ◽  
Vol 14 (10) ◽  
pp. 3679-3688 ◽  
Author(s):  
K. DAROWICKI ◽  
W. FELISIAK
Keyword(s):  
Batch Reactor ◽  
Three Dimensional ◽  
Power Spectra ◽  
Kernel Functions ◽  
Function Parameter ◽  
Frequency Distributions ◽  
Time Frequency ◽  
Class Time ◽  
Cohen's Class ◽  
Belousov Zhabotinsky Reaction

The systematic study of application of Cohen's class time-frequency representations in the analysis of periodic BZ oscillations generated in batch reactor has been presented. Several distributions belonging to Cohen's class have been applied in the analysis of selected signal being the register of bromide selective electrode. Among them were Wigner–Ville, Choi–Williams and cone-shaped distributions. The application of mentioned methods allow instantaneous power spectra to be obtained and simultaneously give the possibility of observing evolution of frequency composition of investigated oscillations. The systematic filtering of signal, using so-called kernel functions, allows to eliminate undesirable cross terms and finally leads to the selection of a suitable method for chemical oscillations decomposition. The results presented in the form of three-dimensional pictures, illustrate the decrease in frequency of oscillations of exponential character. On the basis of the obtained results the cone-shaped distribution for kernel function parameter α=1 has been selected as the best method for Belousov–Zhabotinsky oscillations analysis in joint time-frequency domain.

Dynamical behaviour of the Belousov–Zhabotinsky reaction in a fed-batch reactor

2004 ◽  
Vol 59 (1) ◽  
pp. 139-148 ◽  
Author(s):  
Matthew L. Davies ◽  
Igor Schreiber ◽  
Stephen K. Scott
Keyword(s):  
Batch Reactor ◽  
Dynamical Behaviour ◽  
Fed Batch ◽  
Belousov Zhabotinsky Reaction

Photocatalytic degradation of methylene blue from aqueous solutions using nanopillars-TiO2 thin films: Batch reactor studies

2018 ◽  
Vol 18 (3) ◽  
pp. 81-91 ◽  
Author(s):  
C. Lalhriatpuia
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Organic Carbon ◽  
Photocatalytic Degradation ◽  
Batch Reactor ◽  
Tio2 Thin Films ◽  
Initial Concentration ◽  
Bet Specific Surface Area ◽  
Interfering Ions

Nanopillars-TiO2 thin films was obtained on a borosilicate glass substrate with (S1) and without (S2) polyethylene glycol as template. The photocatalytic behaviour of S1 and S2 thin films was assessed inthe degradation of methylene blue (MB) dye from aqueous solution under batch reactor operations. The thin films were characterized by the SEM, XRD, FTIR and AFM analytical methods. BET specific surface area and pore sizes were also obtained. The XRD data confirmed that the TiO2 particles are in its anatase mineral phase. The SEM and AFM images indicated the catalyst is composed with nanosized pillars of TiO2, evenly distributed on the surface of the substrate. The BET specific surface area and pore sizes of S1 and S2 catalyst were found to be 5.217 and 1.420 m2/g and 7.77 and 4.16 nm respectively. The photocatalytic degradation of MB was well studied at wide range of physico-chemical parameters. The effect of solution pH (pH 4.0 to 10.0) and MB initial concentration (1.0 to 10.0 mg/L) was extensively studied and the effect of several interfering ions, i.e., cadmium nitrate, copper sulfate, zinc chloride, sodium chloride, sodium nitrate, sodium nitrite, glycine, oxalic acid and EDTA in the photocatalytic degradation of MB was demonstrated. The maximum percent removal of MB was observed at pH 8.0 beyond which it started decreasing and a low initial concentration of the pollutant highly favoured the photocatalytic degradation using thin films and the presence of several interfering ions diminished the photocatalytic activity of thin films to some extent. The overall photocatalytic activity was in the order: S2 > S1 > UV. The photocatalytic degradation of MB was followed the pseudo-first-order rate kinetics. The mineralization of MB was studied with total organic carbon measurement using the TOC (total organic carbon) analysis.

Sign in / Sign up

Export Citation Format

Share Document