Electronic Supplementary Material (ESI) for RSC Advances.
This journal is © The Royal Society of Chemistry 2016
Electronic Supplementary Information for:
Hierarchical γ-BaB2O4 hollow microspheres: Surfactant-assisted hydrothermal
formation, phase conversion, optical properties and application as adsorbents
Xiuping Chen, Peiyan Zhai, Jie Li, Heng Zhang*, Wancheng Zhu*
*Department
of Chemical Engineering, Qufu Normal University, Shandong 273165, China
(a)


Intensity (a.u.)
-BaB2O4
JCPDS No. 35-0181
(a3)



 


   
 
(a2)
(a1)
10 20 30 40 50 60 70 80
2
Frequency (%)
32
30
12
15
3
(c2)
41
45
Frequency (%)
41
45
16
15
11
1
0
12 15 18 21 24 27 30
Diameter (m)
0
10
(d1)
31
30
9
3
12
14
16
18
Diameter (m)
20
Fig. S1. XRD patterns (a) and SEM images (b-d, c1) of the hydrothermal products synthesized at different
temperatures with the molar ratio of Ba:B:OH as 1:2:2, the concentration of EDTA-2Na as 0.050 mol L-1 and initial
reactant concentration of Ba(OH)2 as 0.20 mol L-1. Temperature (ºC): a1, b-120; a2, c, c1-150; a3, d-210.
*
Corresponding author. Tel.: +86-537-4453130.
Email: [email protected] (W.C. Zhu); [email protected] (H. Zhang).
1
-BaB2O4
JCPDS No. 35-0181


 


   
 
Intensity (a.u.)

10

(a)
(a3)
(a2)
20
30
40
50
2
60
(a1)
80
70
Fig. S2. XRD patterns (a) and SEM images (b-f, c1, d1) of the γ-BaB2O4 hollow microspheres hydrothermally
synthesized at 180 ºC for different time, with the molar ratio of Ba:B:OH as 1:2:2, the concentration of the
surfactant EDTA-2Na as 0.05 mol L-1 and initial reactant concentration of Ba(OH)2 as 0.20 mol L-1. Time (h): a1, b1.0; a2, c, c1-3.0; a3, d, d1-18.0.
(a)
20
30
(c)
50
2
60
70
20
30
40
50
2
60
70
10
80
20
30
20
30
40
50
60
70
80
40
50
60
70
80
2
(d)
Intensity (a.u.)
3BO3
JCPDS No. 73-2158
Intensity (a.u.)
10
40
C10H14N2Na2O82H2O
(EDTA-2Na)
JCPDS No. 29-1917
Intensity (a.u.)
Intensity (a.u.)
10
(b)
Ba(OH)2·8(H2O)
JCPDS No. 76-0916
80
10
2
Fig. S3. XRD patterns of Ba(OH)2·8(H2O) (a), EDTA-2Na (b), H3BO3 (c), and complex EDTA-Ba (d).
2
(a)
(b)
O
O
C
O
C
2CH2
O
CH2
N
CH2
Ba
N
O
OC
CH2
O
CH2
CH2
CO
Fig. S4. Molecular structural formula of EDTA-2Na (a) and complex EDTA-Ba (b).
3