Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (4): 20210833.doi: 10.7503/cjcu20210833
• Physical Chemistry • Previous Articles Next Articles
TIAN Zhen1, DU Na1, LI Haiping2, SONG Shue3, HOU Wanguo1,2()
Received:
2021-12-15
Online:
2022-04-10
Published:
2022-02-12
Contact:
HOU Wanguo
E-mail:wghou@sdu.edu.cn
Supported by:
CLC Number:
TrendMD:
TIAN Zhen, DU Na, LI Haiping, SONG Shue, HOU Wanguo. Points of Zero Charge and Surface Acid-base Reaction Equilibrium Constants of Mg-Al-Ti Layered Double Hydroxides[J]. Chem. J. Chinese Universities, 2022, 43(4): 20210833.
Sample | Elemental content(mass fraction, %) | Chemical formula | ||||
---|---|---|---|---|---|---|
Mg | Al | Ti | C | H | ||
S0 | 21.77 | 8.10 | 0 | 2.53 | 4.25 | [Mg0.75Al0.25(OH)2](CO3)0.13·0.51H2O |
S0.1 | 23.49 | 7.97 | 1.50 | 2.18 | 4.28 | [Mg0.75Al0.23Ti0.02(OH)2](CO3)0.14·0.64H2O |
S0.2 | 23.85 | 7.08 | 3.06 | 2.24 | 4.15 | [Mg0.75Al0.20Ti0.05(OH)2](CO3)0.15·0.59H2O |
S0.3 | 23.52 | 6.22 | 4.56 | 2.06 | 4.09 | [Mg0.75Al0.18Ti0.07(OH)2](CO3)0.16·0.57H2O |
S0.4 | 24.69 | 5.64 | 6.30 | 2.32 | 4.34 | [Mg0.75Al0.15Ti0.10(OH)2](CO3)0.17·0.58H2O |
Table 1 Elemental contents and chemical formula of Mg-Al-Ti LDHs
Sample | Elemental content(mass fraction, %) | Chemical formula | ||||
---|---|---|---|---|---|---|
Mg | Al | Ti | C | H | ||
S0 | 21.77 | 8.10 | 0 | 2.53 | 4.25 | [Mg0.75Al0.25(OH)2](CO3)0.13·0.51H2O |
S0.1 | 23.49 | 7.97 | 1.50 | 2.18 | 4.28 | [Mg0.75Al0.23Ti0.02(OH)2](CO3)0.14·0.64H2O |
S0.2 | 23.85 | 7.08 | 3.06 | 2.24 | 4.15 | [Mg0.75Al0.20Ti0.05(OH)2](CO3)0.15·0.59H2O |
S0.3 | 23.52 | 6.22 | 4.56 | 2.06 | 4.09 | [Mg0.75Al0.18Ti0.07(OH)2](CO3)0.16·0.57H2O |
S0.4 | 24.69 | 5.64 | 6.30 | 2.32 | 4.34 | [Mg0.75Al0.15Ti0.10(OH)2](CO3)0.17·0.58H2O |
Sample | Unit cell parameter/nm | ds/nm | As,the/(m2·g-1) | As,BET/(m2·g-1) | As,eff/(m2·g-1) | |
---|---|---|---|---|---|---|
a | c | |||||
S0 | 0.3048 | 2.2748 | 0.7583 | 1279 | 167.9 | 95 |
S0.1 | 0.3058 | 2.2854 | 0.7618 | 1233 | 58.1 | 100 |
S0.2 | 0.3060 | 2.3069 | 0.7690 | 1229 | 51.9 | 105 |
S0.3 | 0.3068 | 2.3287 | 0.7762 | 1225 | 36.5 | 98 |
S0.4 | 0.3073 | 2.3510 | 0.7837 | 1208 | 31.1 | 101 |
Table 2 Structural parameters and specific surface areas of Mg-Al-Ti LDHs
Sample | Unit cell parameter/nm | ds/nm | As,the/(m2·g-1) | As,BET/(m2·g-1) | As,eff/(m2·g-1) | |
---|---|---|---|---|---|---|
a | c | |||||
S0 | 0.3048 | 2.2748 | 0.7583 | 1279 | 167.9 | 95 |
S0.1 | 0.3058 | 2.2854 | 0.7618 | 1233 | 58.1 | 100 |
S0.2 | 0.3060 | 2.3069 | 0.7690 | 1229 | 51.9 | 105 |
S0.3 | 0.3068 | 2.3287 | 0.7762 | 1225 | 36.5 | 98 |
S0.4 | 0.3073 | 2.3510 | 0.7837 | 1208 | 31.1 | 101 |
Sample | Ns,eff/(mmol·g-1) | Ns,eff/(μmol·m-2) | Ns,the/(mmol·g-1) | Ns,the/(μmol·m-2) | σst,eff/(mmol·g-1) | σst,eff/(C·m-2) | σst,the/(C·m-2) |
---|---|---|---|---|---|---|---|
S0 | 1.95 | 11.6 | 26.41 | 20.65 | 0.020 | 0.020 | 0.25 |
S0.1 | 2.05 | 35.3 | 25.29 | 20.51 | 0.026 | 0.025 | 0.27 |
S0.2 | 2.15 | 41.4 | 25.19 | 20.48 | 0.026 | 0.024 | 0.29 |
S0.3 | 2.00 | 50.6 | 24.98 | 20.38 | 0.024 | 0.024 | 0.32 |
S0.4 | 2.05 | 65.9 | 24.54 | 20.31 | 0.030 | 0.029 | 0.33 |
Table 3 Surface site density and structural charge density of Mg-Al-Ti LDHs
Sample | Ns,eff/(mmol·g-1) | Ns,eff/(μmol·m-2) | Ns,the/(mmol·g-1) | Ns,the/(μmol·m-2) | σst,eff/(mmol·g-1) | σst,eff/(C·m-2) | σst,the/(C·m-2) |
---|---|---|---|---|---|---|---|
S0 | 1.95 | 11.6 | 26.41 | 20.65 | 0.020 | 0.020 | 0.25 |
S0.1 | 2.05 | 35.3 | 25.29 | 20.51 | 0.026 | 0.025 | 0.27 |
S0.2 | 2.15 | 41.4 | 25.19 | 20.48 | 0.026 | 0.024 | 0.29 |
S0.3 | 2.00 | 50.6 | 24.98 | 20.38 | 0.024 | 0.024 | 0.32 |
S0.4 | 2.05 | 65.9 | 24.54 | 20.31 | 0.030 | 0.029 | 0.33 |
Sample | pHPZNC | pHPZNPC[vs.csalt/(mol·L-1)] | pK | ||||||
---|---|---|---|---|---|---|---|---|---|
Exp. | Cal. | 0.001 | 0.010 | 0.100 | |||||
S0 | 9.57±0.05 | 9.94 | 9.01 | 9.13 | 9.32 | 9.55 | 7.55 | 11.55 | |
S0.1 | 9.65±0.05 | 9.95 | 9.18 | 9.30 | 9.44 | 9.63 | 7.71 | 11.54 | |
S0.2 | 9.71±0.04 | 9.92 | 9.45 | 9.54 | 9.70 | 9.69 | 7.76 | 11.62 | |
S0.3 | 9.79±0.04 | 9.89 | 9.60 | 9.70 | 9.79 | 9.77 | 7.83 | 11.71 | |
S0.4 | 9.92±0.02 | 9.90 | 9.72 | 9.78 | 9.84 | 9.89 | 8.04 | 11.75 |
Table 4 Interface electrochemical parameters of Mg-Al-Ti LDHs
Sample | pHPZNC | pHPZNPC[vs.csalt/(mol·L-1)] | pK | ||||||
---|---|---|---|---|---|---|---|---|---|
Exp. | Cal. | 0.001 | 0.010 | 0.100 | |||||
S0 | 9.57±0.05 | 9.94 | 9.01 | 9.13 | 9.32 | 9.55 | 7.55 | 11.55 | |
S0.1 | 9.65±0.05 | 9.95 | 9.18 | 9.30 | 9.44 | 9.63 | 7.71 | 11.54 | |
S0.2 | 9.71±0.04 | 9.92 | 9.45 | 9.54 | 9.70 | 9.69 | 7.76 | 11.62 | |
S0.3 | 9.79±0.04 | 9.89 | 9.60 | 9.70 | 9.79 | 9.77 | 7.83 | 11.71 | |
S0.4 | 9.92±0.02 | 9.90 | 9.72 | 9.78 | 9.84 | 9.89 | 8.04 | 11.75 |
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