1. REDOX CATALYTIC PROPERTIES OF RASPBERRY-LIKE POLYMER
COMPOSITES COATED WITH GOLD NANOPARTICLES
Maolin Li and Guofang Chen*
Chemistry Department, St. John’s University, Queens, NY 11439 Tel.: 718-990-8092; E-mail: cheng@stjohns.edu
Objective
Acknowledgements
SEM Top View Enlarged View
Kinetics of PGMA@PAH@AuNPs microsphere at
different pH
Kinetics of PGMA@PAH@AuNPs microsphere in
different PAH amount
Kinetics of different ratio of PGMA@PAH@AuNPs
microsphere in 0.1% PAH
•We acknowledge St. John's University for the start-up funding and Seed Grant
support.
•Research carried out in part at the Center for Functional Nanomaterials,
Brookhaven National Laboratory, which is supported by the U.S. Department of
Energy, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886
0 10 20 30 40 50 60
0.00000
0.00002
0.00004
0.00006
0.00008
0.00010
0.00012
0.00014 0.1PAH-0.2mL
0.1PAH-0.4mL
0.1PAH-0.6mL
0.5PAH-0.2mL
0.5PAH-0.4mL
0.5PAH-0.6mL
0.75PAH-0.2mL
0.75PAH-0.4mL
0.75PAH-0.6mL
1.0PAH-0.2mL
1.0PAH-0.4mL
1.0PAH-0.6mL
C
A
(mol/L)
Time (min)
0 10 20 30 40 50
0.00000
0.00002
0.00004
0.00006
0.00008
0.00010
0.00012
0.00014
pH3-0.2mL
pH3-0.4mL
pH3-0.6mL
pH5-0.2mL
pH5-0.4mL
pH5-0.6mL
pH7-0.2mL
pH7-0.4mL
pH7-0.6mL
pH9-0.2mL
pH9-0.4mL
pH9-0.6mL
pH11-0.2mL
pH11-0.4mL
pH11-0.6mL
C
A
(mol/L)
Time (min)
0 2 4 6 8 10 12 14 16 18 20
0.00000
0.00004
0.00008
0.00012
0.00016
0.00020
0.00024
0.00028
100/1-0.2mL
100/1-0.4mL
100/1-0.6mL
100/2-0.2mL
100/2-0.4mL
100/2-0.6mL
100/4-0.2mL
100/4-0.4mL
100/4-0.6mL
100/10-0.2mL
100/10-0.4mL
100/10-0.6mL
C
A
(mol/L)
Time (min)
Catalytic activity of the PGMA-AuNP nanocolloids was
investigated through the reduction of 4-nitrophenol (4-NP) to
4-aminophenol (4-AnP) under an ambient temperature of
about 25℃.
(a) TEM image of the as-prepared composite particles
and (b) HRTEM image of gold nanoparticles coated
onto the modified polymer spheres.
(a) Catalytic reduction of 4-NP to 4-AnP with sodium
borohydride in the presence of PGMA@PAH@AuNPs
composites prepared at a fixed ratio of PAH (0.75% w/v)-
modified PGMA to AuNPs of 2 : 100 (v/v) and pH of 7.
0 100 200 300 400 500 600 700
0
20
40
60
80
100
120
Conversion(%)
Time (s ec)
6.5663 x 10
-12
mole AuNPs; 0.6067 mg PGMA
1.6416 x 10
-12
mole AuNPs; 0.1517 mg PGMA
8.2079 x 10
-13
mole AuNPs; 0.0758 mg PGMA
(b) Effect of the added PGAM@PAH@AuNPs
composites on the reaction rate
0 50 100 150 200 250 300 350
0
20
40
60
80
100
120
Conversion(%)
Time (s ec)
Cycle 1
Cycle 2
Cycle 3
Cycle 4
(c) Recyclability and catalytic activity tests