Biorecovery of gold as nanoparticles and its catalytic activities for p-nitrophenol degradation
Nengwu Zhua,b,c*, YanlanCaoa, Chaohong Shia, Pingxiao Wua,b,c, Haiqin Maa
a
School of Environment and Energy, South China University of Technology, Guangzhou 510006 P.R.
China
b
The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry
of Education, Guangzhou 510006 P.R. China
c
Guangdong Environmental Protection Key Laboratory of Solid Waste Treatment and Recycling,
Guangzhou 510006 P.R. China
*
Correspondence author at: School of Environment and Energy, South China University of
Technology, Guangzhou 510006 P.R. China. Tel./fax: +86 20 3938 0522.
E-mail address: nwzhu@scut.edu.cn.
Recovery Efficiency (%)
100
80
60
40
20
0
0
2.25
1.5
0.75
Biomass dossage (g/L)
3.75
Fig. S1 Recovery Efficiency of gold ions at different initial biomass concentration,
Cd=40mM,CAu=0.5mM, natural pH
Recovery Efficiency (%)
100
80
60
40
20
0
10
20
40
60
Electron donor concentration (mM)
Fig. S2 Recovery Efficiency of gold ions at various electron concentration, Cb=5.25g/L,CAu=0.5mM,
natural pH
Recovery Efficiency (%)
100
80
60
40
20
0
0.1
0.3
0.5
0.7
1.0
Gold ions concentration (mM)
Fig. S3
Recovery Efficiency of gold ions at various initial gold ions concentration,
Cb=5.25g/L,Cd=40mM, natural pH
Recovery Efficiency (%)
100
80
60
40
20
0
2
4
6
8
8
pH
Fig. S4 Recovery Efficiency of gold ions at various pHs, Cb=5.25g/L,Cd=40mM, CAu=0.5mM.
Absorbance (a.u.)
1.6
1.2
0.8
p-NP
0.4
0.0
300
400
500
600
Wavelength (nm)
Fig. S5 UV–Visible absorption spectra of reduction of 4-Nitrophenol by sodium
a
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Absorbance
Absorbance
borohydride in presence of gold colloid R1
0
2
4
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
b
0
6
2
c
Absorbance
Absorbance
-2
0
2
4
6
8
6
8
10
Time (min)
Time/min
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
4
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
10 12 14
Time (h)
-2
d
0
2
4
6
8 10 12 14 16
Time (min)
Fig. S6 Plot of At versus time for the catalytic reduction of p-NP by R1 (a), R2 (b), R3 (c) and R4 (d),
respectively.
Table S1 Comparison of k values in different catalysts
Metal
M (mol/L)
-6
Au
5.00×10
Au
4.2×10-6
-6
Au
5.07×10
Au
2×10
-5
Au
5.0×10-5
k (min-1)
Source
0.665
This study
1×10-4
0.0124
[1]
-4
0.0267
[2]
0.279
[3]
0.486
[4]
p-NP (mol/L)
1×10
1×10
-4
1.1×10
-4
1×10-3
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