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author:

Wu, Minghong (Wu, Minghong.) [1] (Scholars:吴明红) | Shi, Wenyan (Shi, Wenyan.) [2] | Zhang, Haijiao (Zhang, Haijiao.) [3] | Jiao, Zheng (Jiao, Zheng.) [4] | Chen, Jie (Chen, Jie.) [5] | Yao, Side (Yao, Side.) [6] | Ding, Guoji (Ding, Guoji.) [7] | Fu, Jiamo (Fu, Jiamo.) [8]

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SCIE

Abstract:

A wide range of pharmaceutical compounds have been identified in the environment, and their existence is a topic of growing concern, both for human and ecological health. The work described here has investigated the photolytic properties of L(+)-alpha-phenylglycine (L-alpha-PG-H) in aqueous solution as it can be degraded by photo-catalysis. In 266 nm laser flash photolysis of aqueous solution of L-alpha-PG-H saturated with nitrogen, two transient absorption bands are observed at 280-330 nm and 450-800 nm, respectively, due to L-alpha-PG-H radical cation and hydrated electrons (e(aq)(-)). Then e(aq)(-) reacts with L-alpha-PG-H to form the L-alpha-PG-H radical anion. Decaying rate constants of e(aq)(-) observed at 720 nm is to be 8.9 x 10(8) dm(3) mol(-1) s(-1). The rate constant for oxidation of L-alpha-PG-H by SO4- is calculated as 4.5 x 10(8) and 4.3 x 10(8) s(-1) mol(-1) dm(3), respectively. The dissociation constants (pKa) of L-alpha-PG-H is 3. Excited triplet of L-alpha-PG-H in solution is formed by laser flash photolysis. The quench rate constant of L-alpha-PG-H excited triplet (k(s)) is determined to be 1.3 x 10(7) dm(3) mol(-1) s(-1) and k(0) is equal to 1.7 x 10(5) s(-1).

Keyword:

L(+)-alpha-phenylglycine Laser flash photolysis Photo-excitation Photo-ionization Transient absorption

Community:

  • [ 1 ] [Wu, Minghong]Shanghai Univ, Shanghai Appl Radiat Inst, Shanghai 201800, Peoples R China
  • [ 2 ] [Shi, Wenyan]Shanghai Univ, Shanghai Appl Radiat Inst, Shanghai 201800, Peoples R China
  • [ 3 ] [Jiao, Zheng]Shanghai Univ, Shanghai Appl Radiat Inst, Shanghai 201800, Peoples R China
  • [ 4 ] [Fu, Jiamo]Shanghai Univ, Shanghai Appl Radiat Inst, Shanghai 201800, Peoples R China
  • [ 5 ] [Zhang, Haijiao]Shanghai Univ, Dept Environm Engn, Shanghai 201800, Peoples R China
  • [ 6 ] [Chen, Jie]Shanghai Univ, Dept Environm Engn, Shanghai 201800, Peoples R China
  • [ 7 ] [Ding, Guoji]Shanghai Univ, Dept Environm Engn, Shanghai 201800, Peoples R China
  • [ 8 ] [Yao, Side]Chinese Acad Sci, Shanghai Inst Nucl Res, Shanghai 201800, Peoples R China

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Source :

ENVIRONMENTAL CHEMISTRY LETTERS

ISSN: 1610-3653

Year: 2010

Issue: 1

Volume: 8

Page: 25-31

2 . 0 5 1

JCR@2010

1 5 . 0 0 0

JCR@2023

JCR Journal Grade:2

CAS Journal Grade:3

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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