Polysugar-stabilized Pd nanoparticles exhibiting high catalytic activities for hydrodechlorination of environmentally deleterious trichloroethylene.
In this paper, we present a straightforward and environmentally friendly aqueous-phase synthesis of small Pd nanoparticles (approximately 2.4 nm under the best stabilization) by employing a "green", inexpensive, and biodegradable/biocompatible polysugar, sodium carboxymethylcellulose (CMC), as a capping agent. The Pd nanoparticles exhibited rather high catalytic activity (observed pseudo-first-order reaction kinetic rate constant, k(obs), is up to 828 L g(-1) min(-1)) for the hydrodechlorination of environmentally deleterious trichloroethene (TCE) in water. Fourier transform IR (FT-IR) spectra indicate that CMC molecules interact with the Pd nanoparticles via both carboxyl (-COO-) and hydroxyl (-OH) groups, thereby functioning to passivate the surface and suppress the growth of the Pd nanoparticles. Hydrodechlorination of TCE using differently sized CMC-capped Pd nanoparticles as catalyst was systematically investigated in this work. Both the catalytic activity (k(obs)) and the surface catalytic activity (turnover frequency, TOF) of these CMC-capped Pd nanoparticles for TCE degradation are highly size-dependent. This point was further verified by a comparison of the catalytic activities and surface catalytic activities of CMC-capped Pd nanoparticles with those of beta-D-glucose-capped Pd and neat Pd nanoparticles for TCE degradation.
Liu
Juncheng
J
Department of Chemical Engineering and Department of Civil Engineering, Auburn University, Auburn, AL 36849, USA.
He
Feng
F
Durham
Ed
E
Zhao
Dongye
D
Roberts
Christopher B
CB
D002266:Carboxymethylcellulose Sodium / Q000737:chemistry* / Q000378:metabolism; D002384:Catalysis; D002713:Chlorine / Q000737:chemistry*; D005947:Glucose / Q000737:chemistry / Q000378:metabolism; D007700:Kinetics; D053758:Nanoparticles / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D010316:Particle Size; D012995:Solubility; D012996:Solutions / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D014241:Trichloroethylene / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D012996:Solutions; D014241:Trichloroethylene; D002713:Chlorine; D010165:Palladium; D005947:Glucose; D002266:Carboxymethylcellulose Sodium