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magnification magnification

magnification - PowerPoint Presentation

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Uploaded On 2018-01-12

magnification - PPT Presentation

50X magnification 300X magnification 1000X magnification 2000X Near sphere shape Nonuniform size Unsmooth surface The sphere body consist of small strips small strips is cuboid bars pristine ID: 622960

pca magnification hco3 cuo magnification pca cuo hco3 co32 pristine reaction 1000x particle bicarbonate cleaved hco changed distribution carbonate

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Presentation Transcript

Slide1

magnification

50X

magnification

300X

magnification

1000X

magnification

2000X

Near sphere shape

Nonuniform size

Unsmooth surface

The sphere body consist of small strips

small

strips is

cuboid bars

pristineSlide2

magnification

300X

magnification

1000X

magnification

1000X

magnification

2000X

Particle

agminated

Particle cleaved

Cleaved particle

More rough surface

the elongated crystals were broken into smaller pieces

After reactionSlide3

pristine

CuO/PS

no pH adjustment

CuO/PS

pH 7

As result showed, before and after reaction the crystal structure of CuO didn’t changed, indicating that the stable structure of CuO, which is the basis of maintaining the activation function

PDF#89-5896Slide4

Cu(II) 2p

3/2

Cu(II) 2p

1/2

Cu(II) 2p

3/2

Cu(II) 2p

1/2

Cu(II) 2p

3/2

Cu(II) 2p

1/2

pristine

CuO/PS

no pH adjustment

CuO/PS

pH 7

Before and after reaction, copper atom oxidation state was not changed, suggesting that CuO as an persulfate activator was a true catalyst due to the reversible valent change of Cu .

http://xpssimplified.com/elements/copper.phpSlide5

Distribution of carbonate species in aqueous at different pH

H

2

CO

3 → HCO

3-

+ H

+K

a1=4.30

10^-7

 

HCO3

- → CO32-

+ H+K

a2=5.61

10^-11

 

Ka1

=[H

2CO3

][HCO

3-]

[H

+]

Ka1

=[HCO3

-

]

[CO

3

2-

]

[H

+

]

[HCO

3

-

]

[HCO

3

-

]

[CO

3

2-

]

+

+

= C

HCO

3

-

CO

3

2-

H

2

CO

3

Slide6

pH 3 / 2.5 mM

pH 3 / 5 mM

pH 3 / 10 mM

pH 7 / 2.5 mM

pH 7 / 5 mM

pH 7 / 10 mM

HCO

3

-

CO

3

2-

H

2

CO

3

Slide7

pH 3

pH 7

2.5 mM

5 mM

10 mM

2.5 mM

5 mM

10 mM

Evolution of bicarbonate ion distribution in aqueous at different pH

Results showed that except for the system of CuO/PS/(2.5mM NaHCO3)/pH 3, most of the carbonate species is bicarbonate ion, which depends on the solution pHSlide8

[PCA]

[PCA

-

]

[H

+

]

+

[PCA

-

][H

+]

[PCA]

log10

=-pKa = -4.2

[PCA

-][PCA]

log

10

=pH - 4.2

[PCA

-]

[PCA]

pH