Detail of "2446-69-7"

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Removal of p-alkylphenols from aqueous solutions by combined use of mushroom tyrosinase and chitosan beads

All Rights Reserved. Removal of p-alkylphenols from aqueous solutions by combined use of mushroom tyrosinase and chitosan beads. Yamada, Kazunori; Inoue, Tomoaki; Akiba, Yuji; Kashiwada, Ayumi; Matsuda, Kiyomi; Hirata, Mitsuo (Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University 1-2-1 Izumi-cho, Narashino, Chiba 275-8575, Japan). Bioscience, Biotechnology, and Biochemistry, 70(10), 2467-2475 (English) 2006 Japan Society for Bioscience, Biotechnology, and Agrochemistry. 2446-69-7 and 9012-76-4 are also occured in this study. CODEN: BBBIEJ. ISSN: 0916-8451. DOCUMENT TYPE: Journal CA Section: 60 (Waste Treatment and Disposal) Section cross-reference(s): 7, 16 Enzymic removal of p-alkylphenols from aq. solns. was investigated through the two-step approach, the quinone conversion of p-alkylphenols with mushroom tyrosinase (EC 1.14.18.1) and the subsequent adsorption of quinone derivs. enzymically generated on chitosan beads at pH 7.0 and 45 °C as the optimum conditions. This technique is quite effective for removal of various p-alkylphenols from an aq. soln. The % removal values of 97-100% were obtained for p-n-alkylphenols with carbon chain lengths of 5 to 9. In addn., removal of other p-alkylphenols was enhanced by increasing either the tyrosinase concn. or the amt. of added chitosan beads, and their % removal values reached >93 except for 4-tert-pentylphenol. This technique was also applicable to remove 4-n-octylphenol (4NOP) and 4-n-nonylphenol (4NNP) as suspected endocrine disrupting chems. The reaction of quinone derivs. enzymically generated with the chitosan's amino groups was confirmed by the appearance of peaks for UV-visible spectrum measurements of the chitosan films incubated in the p-alkylphenol and tyrosinase mixt. solns. In addn., 4-tert-pentylphenol underwent tyrosinase-catalyzed oxidn. in the presence of hydrogen peroxide. .

Photodegradation of 4-alkylphenols using BiVO4 photocatalyst under irradiation with visible light from a solar simulator

Photodegradation of 4-alkylphenols using BiVO4 photocatalyst under irradiation with visible light from a solar simulator. Kohtani, Shigeru; Koshiko, Masaya; Kudo, Akihiko; Tokumura, Kunihiro; Ishigaki, Yasuhito; Toriba, Akira; Hayakawa, Kazuichi; Nakagaki, Ryoichi (Graduate School of Natural Science and Technology, Kanazawa University 13-1 Takara-machi, Kanazawa 920-0934, Japan). Applied Catalysis, B: Environmental, 46(3), 573-586 (English) 2003 Elsevier Science B.V. CODEN: ACBEE3. ISSN: 0926-3373. DOCUMENT TYPE: Journal CA Section: 60 (Waste Treatment and Disposal) Section cross-reference(s): 67 A visible-light-driven photocatalyst, BiVO4, has been applied for degrdn. of a series of linear 4-n-alkylphenols under irradn. from a solar simulator. Degrdn. rates become faster with increasing alkyl chain length. Half-life of 4-n-nonylphenol (4-n-NP) is 18 min, which is about eight times shorter than that of phenol. The rate law of disappearance for heptyl-, octyl- and nonylphenols exhibits zero-order kinetics. The amt. of adsorption on BiVO4 surface is much larger for longer hydrophobic alkylphenols. It is thus concluded that BiVO4 is suitable for degrdn. of hydrophobic alkylphenols such as nonyl- and octylphenols nominated as endocrine disruptors. Degrdn. of branched 4-nonylphenol (mixt. of isomers) has also been examd., and disappearance of its estrogenic activity was confirmed by means of the yeast two-hybrid assay. A gas chromatog.-mass spectroscopy (GC-MS) anal. 104-40-5 and 2446-69-7 are just another two chemicals used in this study. after solid-phase extn. indicates that the major product is cis,cis-4-alkyl-6-oxo-2,6-hexadienoic acids, and the minor products are 4-alkylcatechols and 4-(1-alkenyl)phenols. .