Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C1835664 (TOC)
 2,763 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The removal performances of EDCs 4-tert-butylphenol (BP) in water using a new process UV/micro-aeration was introduced. The results show that UV/micro-aeration process is also an advanced oxidation and BP can be effectively degraded by UV/micro-aeration process; the degradation of BP by UV/micro-aeration process is greatly influenced by TOC value, BP initial concentrations, intensity of UV radiation, and initial pH of solution. The k1 value of BP degradation increases with TOC values decreasing,or with intensity of UV radiation increasing. The effect of different BP initial concentrations on removal of BP has also been investigated. The k1 value of BP degradation increases with increasing BP initial concentrations in the range of 189 - 410 microg/L, while decreases with increasing initial BP concentrations in the range of 410 - 971 microg/L. The degradation of BP has been investigated under UV/micro-aeration over a wide pH range (2.77 - 8.16), and BP degradation rate in UV/micro-aeration process was significantly enhanced by the initial pH in the range of 2.77 - 4.01, while decreases in the pH range of 4.70 - 8.16.
 ...
PMID:[Degradation of endocrine disrupting chemicals(EDCs)-BP by combination of UV/ micro-aeration process and impact factors]. 1789 55

4-tert-butylphenol (4-t-BP), an endocrine disrupting chemical, is widely distributed in natural bodies of water but is difficult to biodegrade. In this study, we focused on the transformation of 4-t-BP in photo-initiated degradation processes. The steady-state photolysis and laser flash photolysis (LFP) experiments were conducted in order to elucidate its degradation mechanism. Identification of products was performed using the GC-MS, LC-MS and theoretical calculation techniques. The oxidation pathway of 4-t-BP by hydroxyl radical (HO) was also studied and H2O2 was added to produce HO. 4-tert-butylcatechol and 4-tert-butylphenol dimer were produced in 4-t-BP direct photolysis. 4-tert-butylcatechol and hydroquinone were produced by the oxidation of HO. But the formation mechanism of 4-tert-butylcatechol in the two processes was different. The benzene ring was fractured in 4-t-BP oxidation process and 29% of TOC was degraded after 16h irradiation.
...
PMID:Aqueous photodegradation of 4-tert-butylphenol: By-products, degradation pathway and theoretical calculation assessment. 2721 74