DOI: 10.1039/D0CC04101G
ChemComm
our developed Ru/PC is comparable with other
colorimetric sensors such as Au@TiO
nanostructures and MoS
selectivity for H detection using this colorimetric method 60 E-mail: hedaiping@126.com; jphdp868@126.com.
was also investigated. As shown in Fig. 3d, the enhanced
absorbance caused by the addition of 15 mM H is much
H
2
O
2
6
Notes and references
2
2
yolk-shell
nanoflakes.27 Moreover, the
a
Chongqing Key Laboratory of Inorganic Functional Materials, College
2
2
O
2
b
Guangxi Key Laboratory of Chemistry and Engineering of Forest
5
0
5
0
5
0
5
0
5
0
2
O
2
higher than those of many other types of interfering
substances with 10 times concentration, including biologically
relevant metal ions, monosaccharides, and various amino
acids. All these facts demonstrate the feasibility of using
Ru/PC as peroxidase to trigger the TMB color reaction and
c
College of Chemistry and Materials Science, Sichuan Normal University,
65
70
75
80
85
90
Chengdu 610068, China.
† Electronic Supplementary Information (ESI) available: Exprimental
details, SEM and TEM iamges, absorbance curve, kinetic assays. See
DOI: 10.1039/x0xx00000x
1
1
2
2
3
3
4
4
5
‡
These authors contributed equally to this work.
2 2
thus for the H O colorimetric detection.
In addition to mimicking peroxidase for TMB oxidation,
Ru/PC was further found with nitroreductase-like activity for
the reduction of 4-nitroaniline, which is the one of the most
harmful organic pollutants.28 As shown in Fig. 4a, the mixture
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4
of 4-NA and NaBH is yellow at the room temperature, while,
4
after one hour, it fades to a colorless solution with the
addition of 30 µg Ru/PC. At the same time, the characteristic
absorbance at 380 nm of 4-NA decreases rapidly with a
simultaneous appearance of a new absorbance band at about
5 A. P. Nagvenkar and A. Gedanken, ACS Appl. Mater. Interf., 2016.
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26.
7
8
9
1
8
9
3
05 nm, indexed to 4-phenylenediamine (4-PDA). Since the
rate of 4-NA reduction was highly dependent upon the
concentration of NaBH , the optimal concentration of NaBH
was evaluated (Fig. S8) and 8 mM NaBH was added in this
reduction reaction. As the high excess of NaBH involved, a
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4
4
4
4
pseudo-first-order kinetics can be applied in this catalytic
reaction system. The rate constant (k) calculated from the
11 M. Cui, J. Zhou, Y. Zhao and Q. Song, Sensor. Actuat B-Chem., 2017.
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1
slopes of the linear ranges of the ln(A/A
0
) = -kt plots was
1.273×10-2 min-1 (Fig. 4b), which is obviously higher than the
2 W. Luo, C. Zhu, S. Su, D. Li, Y. He, Q. Huang and C. Fan, ACS
Nano., 2010. 4(12): 7451-7458.
-
3
-1 29
reported Ag NPs (6.22×10 min ). This illustrates that our
developed Ru/PC is also an efficient nitroreductase-like
catalyst for 4-NA reduction.
13 B. Liu and J. Liu, Nano Res., 2017. 10(4): 1125-1148.
95 14 B. Liu, Z. Huang and J. Liu, Nanoscale, 2016. 8(28): 13562-13567.
1
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In summary, the small and uniformly dispersed Ru NPs
anchoring on PC matrix were dedicatedly prepared by a
sustainable method, this is the electroless deposition, without
1
1
2
utilization any organic agents, which ensure the achieved Ru 100 17 H. Zhang, X. Liang, L. Han and F. Li, Small, 2018. 14(44): 1803256.
NPs in a clean catalytic surface. This feature, together with
highly inherit activity and the abundance of accessible active
sites, promote the Ru/PC as the peroxidase mimic or
nitroreductase-like catalyst for efficient TMB oxidation and 4-
NA reduction, respectively. This work provides a simple
strategy to prepare the carbon supported metal NPs with a
small size, a uniform dispersion, and a clean surface, and then
explores their potential application in biological analysis and
organic pollutants transformation.
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10
This work was supported by the Natural Science
Foundation of China (Grant No. 21601022), the Foundation
4 H. H. Ye, J. Mohar, Q. X. Wang, M. Catalano, M. J. Kim and X. H.
Xia, Sci. Bull., 2016, 61, 1739-1745.
and
Cutting-edge
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(cstc2018jcyjAX0698 and cstc2019jcyjmsxm0528), the
Program for Leading Talents of Scientific Innovation of
Chongqing Normal University, and Guangxi Natural Science
Foundation (Grant No. 2018GXNSFAA294076 and
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Conflicts of interest
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There are no conflicts to declare.
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