Degradation of phenylarsonic acid and its derivatives into arsenate by hydrothermal treatment and photocatalytic reaction

Autor:	Tsunenori Nakajima, Shigeru Maeda, Hirofumi Kawabata, Hirokazu Takanashi, Takanori Kawabata, Akira Ohki
Rok vydání:	2005
Předmět:	Chemistry Inorganic chemistry Arsenate Hydrothermal treatment Photocatalytic reaction General Chemistry Phenylarsonic acid Cleavage (embryo) Inorganic Chemistry chemistry.chemical_compound Photocatalysis Nitro Degradation (geology) Nuclear chemistry
Zdroj:	Applied Organometallic Chemistry. 19:254-259
ISSN:	1099-0739 0268-2605
DOI:	10.1002/aoc.720
Popis:	The degradation of phenylarsonic acid (PA) and its derivatives by hydrothermal treatment (HTT) was examined, especially focusing on the effect of adding H 2 O 2 upon the degradation efficiency. The degradation was assessed by the generation of arsenate resulting from the cleavage of As-C bonds in the PA derivatives. When PA (without substituents) was subjected to an HTT with H 2 O 2 (H 2 O 2 -HTT; 0.5-1% H 2 O 2 ) at 175-200 °C, PA was almost completely degraded into arsenate, whereas an HTT with NaOH (NaOH-HTT; 3 M NaOH) at the temperatures provided almost no degradation. The H 2 O 2 -HTT also worked well for the degradation of PA derivatives with hydroxy and/or nitro groups on the phenyl ring. However, the degradation of aminophenylarsonic acids was not favorably performed by the H 2 O 2 -HTT. The effect of the structure of PA derivatives upon the degradation susceptibility was discussed. A photocatalytic reaction using TiO 2 was also attempted for the degradation of PA derivatives.
Databáze:	OpenAIRE
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