Bimetallic Nanoparticles - Nanotechnologies for Water Environment Applications - page 168

accumulation of reaction products (i.e., chloromethane and methane) was detected. The
formation of these reaction products indicates dichloromethane undergoes a reduction
reaction. The fast initial disappearance of dichloromethane implies that the removal of
dichloromethane involves the sorption occurring initially. Similar results have been
observed in many other surface-mediated processes where the rapid initial decrease of
reactants is attributed to the effect of sorption (Burris et al., 1998). This example
demonstrates the unique feature of bimetallic Cu/Al particles for the feasibility to
reductively degrade less-chlorinated organic compounds.

[AL-F-2.RAW] Al(7N)-Fresh [AL-F-2.RAW] Al(7N)-Fresh [AL-F-2.RAW] Al(7N)-Fresh [AL-F-2.RAW] Al(7N)-Fresh

7000 7000 7000 7000

6000 6000 6000 6000

Al
Cu
Al(OH) 3

Al
Cu
Al(OH) 3

Al
Cu
Al(OH) 3

5000 5000 5000 5000

4000 4000 4000 4000

3000 3000 3000 3000

2000 2000 2000 2000

1000 1000 1000 1000

0 0 0 0

10 10 10 10 20 20 20 20 30 30 30 30 40 40 40 40 50 50 50 50 60 60 60 60 70 70 70 70 80 80 80 80

2-Theta(? 2-Theta(? 2-Theta(? 2-Theta(?

2θ 2θ

Figure 7.5 XRD pattern of fresh bimetallic Cu/Al particles.

2 2

CH2Cl2
CH3Cl
CH4

CH2Cl2
CH3Cl
CH4

CH 2 Cl 2
CH 3 Cl
CH 4

CH 2 Cl 2
CH 3 Cl
CH 4

1.5 1.5

1 1

0.5 0.5

0 0

0 0 100 100 200 200 300 300

Time (h) Time (h)

Figure 7.6 Repetitive addition of dichloromethane in reaction with bimetallic Cu/Al
particles.