Electrooxidation of Aqueous p-Methoxyphenol on Lead Oxide Electrodes

Borrás, C.; Rodríguez, P.; Laredo, T.; Mostany, J.; Scharifker, B. R.
June 2004
Journal of Applied Electrochemistry;Jun2004, Vol. 34 Issue 6, p583
Academic Journal
Oxidation of p-methoxyphenol (pmp) in aqueous solution on bismuth-doped lead oxide was studied, and the effects of the initial pmp concentration, applied potential and hydrodynamic conditions upon the oxidation rate were identified. Under all conditions studied, the concentration decay of pmp during electrooxidation follows first–order reaction kinetics. Through analysis of rotating ring-disc currents, the faradaic efficiencies for oxidation at various concentrations of pmp in solution were determined. Using u.v.–vis. and H1RMN spectroscopy for solution analysis, it is shown that partial oxidation of pmp occurs in chloride-free aqueous solutions. The principal products were p-benzoquinone and maleic acid, with low production of CO2 up to 1000 C dm-3 charge. Mineralization to CO2 was considerably improved upon addition of chloride ions to the solution. In situ FTIR spectra of the electrode surface during electrolysis indicated that the presence of chloride ions enhances the mineralization of pmp by reaction of benzoquinone with anodically generated hypochlorite.


Related Articles

  • Oxidation of p-methoxyphenol on SnO2–Sb2O5 electrodes: Effects of electrode potential and concentration on the mineralization efficiency. Borrás, C.; Berzoy, C.; Mostany, J.; Scharifker, B. // Journal of Applied Electrochemistry;Apr2006, Vol. 36 Issue 4, p433 

    The oxidation of p-methoxyphenol in aqueous solution on antimony-doped tin oxide has been studied, and the effects of applied potential and initial PMP concentration upon the oxidation rate have been identified. The concentration decay of PMP during its electrooxidation follows first-order...

  • High-rate 3-methylcatechol production in Pseudomonas putida strains by means of a novel expression system. Hüsken, L. E.; Beeftink, R.; De Bont, J. A. M.; Wery, J. // Applied Microbiology & Biotechnology;May2001, Vol. 55 Issue 5, p571 

    The bioconversion of toluene into 3-methylcatechol was studied as a model system for the production of valuable 3-substituted catechols in general. For this purpose, an improved microbial system for the production of 3-methylcatechol was obtained. Pseudomonas putida strains containing the...

  • Inhibitory effect of chlorinated guaiacols on methanogenic activity of anaerobic digester sludge. Yin, Cheng-Ri; Seo, Dong-Il; Baek, Seung-Hun; Ohlen, Ken; Lee, Sung-Taik // Biotechnology Letters;Sep2001, Vol. 23 Issue 17, p1379 

    Of four chlorinated guaiacols, tetrachloroguaiacol at 62 μM inhibited acetate methanogenesis, the strongest decreasing activity by 50%. 4,5,6-Trichloroguaiacol, 4,5-dichloroguaiacol, and 4-chloroguaiacol showed 50% inhibition at 0.13, 0.32, and 1.50 mM, respectively. Degradation test results...

  • Biological production of optically active muconolactones by Rhodococcus rhodochrous. Cha, C.-J. // Applied Microbiology & Biotechnology;Aug2001, Vol. 56 Issue 3/4, p453 

    Optically active (-)-3-methylmuconolactone was biologically produced using a mutant strain of Rhodococcus rhodochrous N75 that is capable of metabolizing 4-methylcatechol via a modified ortho-cleavage pathway. The mutant strain (CJ30) was prepared by mutagenesis using...

  • TISSUE DISTRIBUTION,EXCRETION AND METABOLISM OF O-ANISIDINE IN RATS. Sapota, Andrzej; Czerski, Bogdan; Jedrzejczak, Marian // International Journal of Occupational Medicine & Environmental H;Oct2003, Vol. 16 Issue 4, p351 

    Objectives: The principal commercial use of o-anisidine is believed to be as an intermediate in the manufacture of dyes. It has also been reported to be an intermediate in the manufacture of synthetic guaiacol and its derivatives. o-Anisidine is an urinary bladder carcinogen in mice and rats....

  • guaiacol.  // Royal Society of Medicine: Medicines;2002, p274 

    This article presents information on guaiacol which is found in plant oils and is incorporated into proprietary preparations as an expectorant, though evidence of its efficacy is lacking. It is orally administered. It is regarded as safe in normal use at high dilution. Little is known about it,...

  • Direct synthesis of dimethyl ether from synthesis gas over metal-pillared ilerites. Ahn, Sung-Hwan; Kim, Song-Hyoung; Hahm, Hyun-Sik // Research on Chemical Intermediates;2008, Vol. 34 Issue 8/9, p793 

    The capability of metal (Cu, Zn)-pillared ilerites and metal oxide (CuO, ZnO)-impregnated metal-pillared ilerites for direct synthesis of dimethyl ether (DME) from synthesis gas was explored. The metal-pillared ilerites were synthesized and characterized by XRD, BET, ICP-AES and SEM. The...

  • Metal oxide catalysts for DME steam reforming: Ga2O3 and Ga2O3-Al2O3 catalysts. Mathew, Thomas; Yamada, Yusuke; Ueda, Atsushi; Shioyama, Hiroshi; Kobayashi, Tetsuhiko // Catalysis Letters;Mar2005, Vol. 100 Issue 3/4, p247 

    The steam reforming of dimethyl ether (DME) was performed on Ga2O3-Al2O3 mixed oxides prepared by sol-gel method. Ga2O3 significantly affects the catalytic performance with respect to the DME conversion and H2 yield. The catalytic activity increases with the Ga concentration in Ga2O3-Al2O3 mixed...

  • Description of the torsional motion of identical tops in molecules of dimethyl ether and acetone. Burenin, A. V. // Optics & Spectroscopy;Dec2007, Vol. 103 Issue 6, p899 

    The geometric symmetry group of the internal dynamics of molecules of model of description of molecules of dimethyl ether and acetone is obtained taking into account the torsional motion of identical methyl tops. On this basis, a rigorous model for the description of the spectra of these...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics