Photocatalytic decomposition of crotamiton over aqueous TiO(2) suspensions: determination of intermediates and the reaction pathway

Chemosphere
Shuji FukahoriN Funamizu

Abstract

The photocatalytic degradation of crotamiton in aqueous solution using TiO(2) was investigated. To investigate the effect of initial pH, the photodegradation behaviors of three types of pharmaceuticals were compared (crotamiton, clofibric acid, sulfamethoxazole). The degradation rates of crotamiton in the pH range 3-9 were nearly equal, but those of clofibric acid and sulfamethoxazole were affected by pH. At pH>6.5, TiO(2) particles, clofibric acid and sulfamethoxazole had negative charge, therefore, the repulsive force between TiO(2) particles and anionic pharmaceuticals occurred and a low reaction rate at high pH was observed. The effect of UV intensity and TiO(2) concentration on photodegradation efficiency was also investigated. Linear and logarithmical relationships between UV intensity, TiO(2) concentration and the reaction rate constant were confirmed. Furthermore, the structures of photodegradation intermediates formed concomitantly with the disappearance of crotamiton were estimated. Seven intermediates were characterized by LC/MS/MS analyses, and it was assumed that the photocatalytic degradation of crotamiton was initiated by the attack of electrophilic hydroxyl radicals on aromatic rings and alkyl chains.

References

Jan 5, 2002·Fresenius' Journal of Analytical Chemistry·K Böckenhoff, W R Fischer
Nov 1, 2003·Journal of Environmental Monitoring : JEM·Rakesh KandaJames Fothergill
Nov 1, 2005·Aquatic Toxicology·Karl FentDaniel Caminada
Apr 5, 2007·Nature Protocols·Imran Ali, V K Gupta
Feb 16, 2008·Journal of Hazardous Materials·Xu ZhangNansheng Deng
Sep 2, 2008·Environment International·Maria KlavariotiDespo Kassinos
Feb 3, 2009·Chemosphere·Klaus Kümmerer
Jul 11, 2009·Journal of Hazardous Materials·Angela Yu-Chen LinP K Andy Hong
Nov 28, 2012·Materials Science & Engineering. C, Materials for Biological Applications·Vinod K GuptaShalini Sikarwar

❮ Previous
Next ❯

Citations

Mar 25, 2014·Journal of Hazardous Materials·Shuji Fukahori, Taku Fujiwara
Sep 9, 2015·Journal of Hazardous Materials·Chin-Sheng KuoPui-Kwan Andy Hong
Apr 22, 2015·Journal of Environmental Management·Shuji Fukahori, Taku Fujiwara
Jul 16, 2015·Water Science and Technology : a Journal of the International Association on Water Pollution Research·S FukahoriN Funamizu
Jan 9, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Mahsa FooladSay Leong Ong
Jan 1, 2013·Personalized Medicine·Krissi DanielssonRoland Andersson
Feb 13, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Qun XiangTaku Fujiwara

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.