Fig.
7 ATR-IR and XPS for the fresh and
used MIL-100(Fe) (a ~c were the results
of ATR-IR, d was the result of XPS)
In order to make it clear what happened for the SDS covered on the model
emulsion. The component of the SDS solution after interaction with
MIL-100(Fe) was detected by ion chromatogram (IC) and liquid
chromatogram-mass spectroscopy (LC-MS). The result of IC suggested that
the SO32- or
SO42- was released from SDS after
interaction with MIL-100(Fe) (Fig. 8 ). What’s more, MIL-100(Fe)
degraded the SDS obviously according to the results of LC-MS
(Fig. S8 ). The hydrogenation peak at m /z =187
verified that the degradation products contained dodecyl alcohol
(CH3(CH2)10CH2OH,
M=186) (Fig. S9 ), which implied that the group of
SO32- instead of
SO42-, was prefer to be extracted from
SDS when the MIL-100(Fe) interacted with SDS. The dodecyl alcohol could
be oxidized into undecyl carboxylic acid
(CH3(CH2)10COOH, M=200)
with a molecule ion peak at m /z =199 (Fig. S9 )
further. After interaction with SDS, the BTC with a molecule ion peak atm /z =209 (Fig. S10 ) was released from MIL-100(Fe).
The components with retention time of 4.6 min (m /z =223)
and 5.1 min (m /z =237) were the ester and binary ester of
BTC with formulas of
C8H5O6CH3and
C8H4O6(CH3)2(Fig. S11 and Fig. S12 ). Those esters might be the
residues when the MIL-100(Fe) was prepared, because there were
absorption band of C-H for CH3 at 2871
cm-1 and 2974 cm-1 and absorption
band of C-O-C for esters at 1088 cm-1 in the ATR-IR
results of fresh MIL-100(Fe) (Fig. S13 ). The leaching for BTC,
C8H5O6CH3and
C8H4O6(CH3)2implied that the structure of MIL-100(Fe) was destroyed at some degree,
which can cause the changes of absorbance for the carboxylate and
-CH3 group as showed in Fig. 7a and7c .