加布瑞拉·王尔德美腿:请各位翻译高手帮忙

Fig.1 Photochemical batch reactor employed in all irradiation
experiments
The amount of H2O2 added is the stoichiometric
amount of H2O2 required for the total oxidation
of phenol as calculated according to Eq.(5).
C6H6O + 14H2O2 --6CO2 + 17H2O (5)
Following standard experimentation practice,
one multiple of Qth means 1.32 ml H2O2 solution of
30% (W/W) concentration.
Analytical methods
Phenol concentration was measured by amino-
pyrine colorimetric method (Xi et al., 1989). The
degradation rate, η, of phenol was defined as:
η = 1 - C/Co (6)
where, C and Co were phenol concentration at time t
and time zero, respectively. PHS-25 type pH meter
was used to measure the pH value (Xi et al., 1989).
The metal ion concentrations were determined by
spectrophotometric method (Xi et al., 1989). Analy-
sis of the CODcr was carried out using a titrimetric
method (Xi et al., 1989).
RESULTS AND DISCUSSION
Ion-exchange isotherms of Fe2+, Cu2+ and Mn2+
with NaY zeoliteThe ion-exchange isotherms of Fe2+, Cu2+ and
Mn2+ with NaY zeolite were measured and the results
are given in Fig.2 and Table 1 showing that the
ion-exchangeability of three kinds of metal ions on
the NaY zeolite was in the order: Cu2+ > Fe2+ > Mn2+.
The isotherms were correlated with Langmuir’s
equation
q = qmaxC/ (b + C) (7)
where, q and qmax represent the amount and maximum
amount of ion exchange on the NaY zeolite,
respectively, and b is a constant. The simulated qmax
and b values are listed in Table 1.
Preparation and comparison of multi-component
metal-ion catalysts
Fig.2 The isotherms of Fe2+, Cu2+, Mn2+
Table 1 Comparative study on the isotherm of Fe2+, Cu2+,
Mn2+
1. Fe-Mn-Y catalyst
Fe2+ and Mn2+ concentration ratio was changed,
while keeping the concentration of total metal ions
at 900 mg/L. The obtained catalysts were evaluated
in the heterogeneous UV/Fenton process. The experimental
procedure was as follows: 0.2 g catalyst
and 1/4 Qth of H2O2 were added to 500 ml solution
with 250 mg/L phenol to start the reaction with results
as shown in Fig.3. It was obvious that the
CODcr removal capabilities with two-component
metal-ion catalysts were higher than that with single
metal-ion catalysts. The optimal Fe2+ to Mn2+ ratio
of 2:1 was obtained for CODcr removal. After 40
min reaction, the CODcr removal rate reached 76.7%,
which was 30.5% and 28.6% higher than that catalyzed
by single Fe2+ and Mn2+ catalysts, respectively.
It indicated that synergistic effect should exist between
Fe2+ and Mn2+ in heterogeneous UV/Fenton
reaction. The synergistic effect among these transition
metal ions may be due to their differing redox
potential, which may enhance the deoxidizing of
high valence ion to low valence ion and result in
production of peroxyl radicals.
Fig.3 CODcr removal rate vs time